drivers/scsi/cxgbi/libcxgbi.c

   1 /*
   2  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by: Karen Xie (kxie@chelsio.com)
  11  * Written by: Rakesh Ranjan (rranjan@chelsio.com)
  12  */
  13
  14 #define pr_fmt(fmt)     KBUILD_MODNAME ":%s: " fmt, __func__
  15
  16 #include <linux/skbuff.h>
  17 #include <linux/crypto.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/pci.h>
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <scsi/scsi_host.h>
  23 #include <linux/if_vlan.h>
  24 #include <linux/inet.h>
  25 #include <net/dst.h>
  26 #include <net/route.h>
  27 #include <linux/inetdevice.h>   /* ip_dev_find */
  28 #include <linux/module.h>
  29 #include <net/tcp.h>
  30
  31 static unsigned int dbg_level;
  32
  33 #include "libcxgbi.h"
  34
  35 #define DRV_MODULE_NAME         "libcxgbi"
  36 #define DRV_MODULE_DESC         "Chelsio iSCSI driver library"
  37 #define DRV_MODULE_VERSION      "0.9.0"
  38 #define DRV_MODULE_RELDATE      "Jun. 2010"
  39
  40 MODULE_AUTHOR("Chelsio Communications, Inc.");
  41 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  42 MODULE_VERSION(DRV_MODULE_VERSION);
  43 MODULE_LICENSE("GPL");
  44
  45 module_param(dbg_level, uint, 0644);
  46 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
  47
  48
  49 /*
  50  * cxgbi device management
  51  * maintains a list of the cxgbi devices
  52  */
  53 static LIST_HEAD(cdev_list);
  54 static DEFINE_MUTEX(cdev_mutex);
  55
  56 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  57                                 unsigned int max_conn)
  58 {
  59         struct cxgbi_ports_map *pmap = &cdev->pmap;
  60
  61         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  62                                              sizeof(struct cxgbi_sock *),
  63                                              GFP_KERNEL);
  64         if (!pmap->port_csk) {
  65                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  66                 return -ENOMEM;
  67         }
  68
  69         pmap->max_connect = max_conn;
  70         pmap->sport_base = base;
  71         spin_lock_init(&pmap->lock);
  72         return 0;
  73 }
  74 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  75
  76 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  77 {
  78         struct cxgbi_ports_map *pmap = &cdev->pmap;
  79         struct cxgbi_sock *csk;
  80         int i;
  81
  82         for (i = 0; i < pmap->max_connect; i++) {
  83                 if (pmap->port_csk[i]) {
  84                         csk = pmap->port_csk[i];
  85                         pmap->port_csk[i] = NULL;
  86                         log_debug(1 << CXGBI_DBG_SOCK,
  87                                 "csk 0x%p, cdev 0x%p, offload down.\n",
  88                                 csk, cdev);
  89                         spin_lock_bh(&csk->lock);
  90                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
  91                         cxgbi_sock_closed(csk);
  92                         spin_unlock_bh(&csk->lock);
  93                         cxgbi_sock_put(csk);
  94                 }
  95         }
  96 }
  97 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
  98
  99 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
 100 {
 101         log_debug(1 << CXGBI_DBG_DEV,
 102                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 103         cxgbi_hbas_remove(cdev);
 104         cxgbi_device_portmap_cleanup(cdev);
 105         if (cdev->dev_ddp_cleanup)
 106                 cdev->dev_ddp_cleanup(cdev);
 107         else
 108                 cxgbi_ddp_cleanup(cdev);
 109         if (cdev->ddp)
 110                 cxgbi_ddp_cleanup(cdev);
 111         if (cdev->pmap.max_connect)
 112                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 113         kfree(cdev);
 114 }
 115
 116 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 117                                            unsigned int nports)
 118 {
 119         struct cxgbi_device *cdev;
 120
 121         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 122                         (sizeof(struct cxgbi_hba *) +
 123                          sizeof(struct net_device *)),
 124                         GFP_KERNEL);
 125         if (!cdev) {
 126                 pr_warn("nport %d, OOM.\n", nports);
 127                 return NULL;
 128         }
 129         cdev->ports = (struct net_device **)(cdev + 1);
 130         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 131                                                 sizeof(struct net_device *));
 132         if (extra)
 133                 cdev->dd_data = ((char *)cdev->hbas) +
 134                                 nports * sizeof(struct cxgbi_hba *);
 135         spin_lock_init(&cdev->pmap.lock);
 136
 137         mutex_lock(&cdev_mutex);
 138         list_add_tail(&cdev->list_head, &cdev_list);
 139         mutex_unlock(&cdev_mutex);
 140
 141         log_debug(1 << CXGBI_DBG_DEV,
 142                 "cdev 0x%p, p# %u.\n", cdev, nports);
 143         return cdev;
 144 }
 145 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 146
 147 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 148 {
 149         log_debug(1 << CXGBI_DBG_DEV,
 150                 "cdev 0x%p, p# %u,%s.\n",
 151                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 152         mutex_lock(&cdev_mutex);
 153         list_del(&cdev->list_head);
 154         mutex_unlock(&cdev_mutex);
 155         cxgbi_device_destroy(cdev);
 156 }
 157 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 158
 159 void cxgbi_device_unregister_all(unsigned int flag)
 160 {
 161         struct cxgbi_device *cdev, *tmp;
 162
 163         mutex_lock(&cdev_mutex);
 164         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 165                 if ((cdev->flags & flag) == flag) {
 166                         log_debug(1 << CXGBI_DBG_DEV,
 167                                 "cdev 0x%p, p# %u,%s.\n",
 168                                 cdev, cdev->nports, cdev->nports ?
 169                                  cdev->ports[0]->name : "");
 170                         list_del(&cdev->list_head);
 171                         cxgbi_device_destroy(cdev);
 172                 }
 173         }
 174         mutex_unlock(&cdev_mutex);
 175 }
 176 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 177
 178 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 179 {
 180         struct cxgbi_device *cdev, *tmp;
 181
 182         mutex_lock(&cdev_mutex);
 183         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 184                 if (cdev->lldev == lldev) {
 185                         mutex_unlock(&cdev_mutex);
 186                         return cdev;
 187                 }
 188         }
 189         mutex_unlock(&cdev_mutex);
 190         log_debug(1 << CXGBI_DBG_DEV,
 191                 "lldev 0x%p, NO match found.\n", lldev);
 192         return NULL;
 193 }
 194 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 195
 196 static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 197                                                         int *port)
 198 {
 199         struct net_device *vdev = NULL;
 200         struct cxgbi_device *cdev, *tmp;
 201         int i;
 202
 203         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 204                 vdev = ndev;
 205                 ndev = vlan_dev_real_dev(ndev);
 206                 log_debug(1 << CXGBI_DBG_DEV,
 207                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 208         }
 209
 210         mutex_lock(&cdev_mutex);
 211         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 212                 for (i = 0; i < cdev->nports; i++) {
 213                         if (ndev == cdev->ports[i]) {
 214                                 cdev->hbas[i]->vdev = vdev;
 215                                 mutex_unlock(&cdev_mutex);
 216                                 if (port)
 217                                         *port = i;
 218                                 return cdev;
 219                         }
 220                 }
 221         }
 222         mutex_unlock(&cdev_mutex);
 223         log_debug(1 << CXGBI_DBG_DEV,
 224                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 225         return NULL;
 226 }
 227
 228 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 229 {
 230         int i;
 231         struct cxgbi_hba *chba;
 232
 233         log_debug(1 << CXGBI_DBG_DEV,
 234                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 235
 236         for (i = 0; i < cdev->nports; i++) {
 237                 chba = cdev->hbas[i];
 238                 if (chba) {
 239                         cdev->hbas[i] = NULL;
 240                         iscsi_host_remove(chba->shost);
 241                         pci_dev_put(cdev->pdev);
 242                         iscsi_host_free(chba->shost);
 243                 }
 244         }
 245 }
 246 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 247
 248 int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun,
 249                 unsigned int max_id, struct scsi_host_template *sht,
 250                 struct scsi_transport_template *stt)
 251 {
 252         struct cxgbi_hba *chba;
 253         struct Scsi_Host *shost;
 254         int i, err;
 255
 256         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 257
 258         for (i = 0; i < cdev->nports; i++) {
 259                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 260                 if (!shost) {
 261                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 262                                 cdev, i, cdev->ports[i]->name);
 263                         err = -ENOMEM;
 264                         goto err_out;
 265                 }
 266
 267                 shost->transportt = stt;
 268                 shost->max_lun = max_lun;
 269                 shost->max_id = max_id;
 270                 shost->max_channel = 0;
 271                 shost->max_cmd_len = 16;
 272
 273                 chba = iscsi_host_priv(shost);
 274                 chba->cdev = cdev;
 275                 chba->ndev = cdev->ports[i];
 276                 chba->shost = shost;
 277
 278                 log_debug(1 << CXGBI_DBG_DEV,
 279                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 280                         cdev, i, cdev->ports[i]->name, chba);
 281
 282                 pci_dev_get(cdev->pdev);
 283                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 284                 if (err) {
 285                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 286                                 cdev, i, cdev->ports[i]->name);
 287                         pci_dev_put(cdev->pdev);
 288                         scsi_host_put(shost);
 289                         goto  err_out;
 290                 }
 291
 292                 cdev->hbas[i] = chba;
 293         }
 294
 295         return 0;
 296
 297 err_out:
 298         cxgbi_hbas_remove(cdev);
 299         return err;
 300 }
 301 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 302
 303 /*
 304  * iSCSI offload
 305  *
 306  * - source port management
 307  *   To find a free source port in the port allocation map we use a very simple
 308  *   rotor scheme to look for the next free port.
 309  *
 310  *   If a source port has been specified make sure that it doesn't collide with
 311  *   our normal source port allocation map.  If it's outside the range of our
 312  *   allocation/deallocation scheme just let them use it.
 313  *
 314  *   If the source port is outside our allocation range, the caller is
 315  *   responsible for keeping track of their port usage.
 316  */
 317 static int sock_get_port(struct cxgbi_sock *csk)
 318 {
 319         struct cxgbi_device *cdev = csk->cdev;
 320         struct cxgbi_ports_map *pmap = &cdev->pmap;
 321         unsigned int start;
 322         int idx;
 323
 324         if (!pmap->max_connect) {
 325                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 326                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 327                 return -EADDRNOTAVAIL;
 328         }
 329
 330         if (csk->saddr.sin_port) {
 331                 pr_err("source port NON-ZERO %u.\n",
 332                         ntohs(csk->saddr.sin_port));
 333                 return -EADDRINUSE;
 334         }
 335
 336         spin_lock_bh(&pmap->lock);
 337         if (pmap->used >= pmap->max_connect) {
 338                 spin_unlock_bh(&pmap->lock);
 339                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 340                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 341                 return -EADDRNOTAVAIL;
 342         }
 343
 344         start = idx = pmap->next;
 345         do {
 346                 if (++idx >= pmap->max_connect)
 347                         idx = 0;
 348                 if (!pmap->port_csk[idx]) {
 349                         pmap->used++;
 350                         csk->saddr.sin_port =
 351                                 htons(pmap->sport_base + idx);
 352                         pmap->next = idx;
 353                         pmap->port_csk[idx] = csk;
 354                         spin_unlock_bh(&pmap->lock);
 355                         cxgbi_sock_get(csk);
 356                         log_debug(1 << CXGBI_DBG_SOCK,
 357                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 358                                 cdev, csk->port_id,
 359                                 cdev->ports[csk->port_id]->name,
 360                                 pmap->sport_base + idx, pmap->next);
 361                         return 0;
 362                 }
 363         } while (idx != start);
 364         spin_unlock_bh(&pmap->lock);
 365
 366         /* should not happen */
 367         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 368                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 369                 pmap->next);
 370         return -EADDRNOTAVAIL;
 371 }
 372
 373 static void sock_put_port(struct cxgbi_sock *csk)
 374 {
 375         struct cxgbi_device *cdev = csk->cdev;
 376         struct cxgbi_ports_map *pmap = &cdev->pmap;
 377
 378         if (csk->saddr.sin_port) {
 379                 int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base;
 380
 381                 csk->saddr.sin_port = 0;
 382                 if (idx < 0 || idx >= pmap->max_connect) {
 383                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 384                                 cdev, csk->port_id,
 385                                 cdev->ports[csk->port_id]->name,
 386                                 ntohs(csk->saddr.sin_port));
 387                         return;
 388                 }
 389
 390                 spin_lock_bh(&pmap->lock);
 391                 pmap->port_csk[idx] = NULL;
 392                 pmap->used--;
 393                 spin_unlock_bh(&pmap->lock);
 394
 395                 log_debug(1 << CXGBI_DBG_SOCK,
 396                         "cdev 0x%p, p#%u %s, release %u.\n",
 397                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 398                         pmap->sport_base + idx);
 399
 400                 cxgbi_sock_put(csk);
 401         }
 402 }
 403
 404 /*
 405  * iscsi tcp connection
 406  */
 407 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 408 {
 409         if (csk->cpl_close) {
 410                 kfree_skb(csk->cpl_close);
 411                 csk->cpl_close = NULL;
 412         }
 413         if (csk->cpl_abort_req) {
 414                 kfree_skb(csk->cpl_abort_req);
 415                 csk->cpl_abort_req = NULL;
 416         }
 417         if (csk->cpl_abort_rpl) {
 418                 kfree_skb(csk->cpl_abort_rpl);
 419                 csk->cpl_abort_rpl = NULL;
 420         }
 421 }
 422 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 423
 424 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 425 {
 426         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 427
 428         if (!csk) {
 429                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 430                 return NULL;
 431         }
 432
 433         if (cdev->csk_alloc_cpls(csk) < 0) {
 434                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 435                 kfree(csk);
 436                 return NULL;
 437         }
 438
 439         spin_lock_init(&csk->lock);
 440         kref_init(&csk->refcnt);
 441         skb_queue_head_init(&csk->receive_queue);
 442         skb_queue_head_init(&csk->write_queue);
 443         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 444         rwlock_init(&csk->callback_lock);
 445         csk->cdev = cdev;
 446         csk->flags = 0;
 447         cxgbi_sock_set_state(csk, CTP_CLOSED);
 448
 449         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 450
 451         return csk;
 452 }
 453
 454 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 455                                       __be32 saddr, __be32 daddr,
 456                                       __be16 sport, __be16 dport, u8 tos)
 457 {
 458         struct rtable *rt;
 459
 460         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 461                                    dport, sport, IPPROTO_TCP, tos, 0);
 462         if (IS_ERR(rt))
 463                 return NULL;
 464
 465         return rt;
 466 }
 467
 468 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 469 {
 470         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 471         struct dst_entry *dst;
 472         struct net_device *ndev;
 473         struct cxgbi_device *cdev;
 474         struct rtable *rt = NULL;
 475         struct neighbour *n;
 476         struct flowi4 fl4;
 477         struct cxgbi_sock *csk = NULL;
 478         unsigned int mtu = 0;
 479         int port = 0xFFFF;
 480         int err = 0;
 481
 482         if (daddr->sin_family != AF_INET) {
 483                 pr_info("address family 0x%x NOT supported.\n",
 484                         daddr->sin_family);
 485                 err = -EAFNOSUPPORT;
 486                 goto err_out;
 487         }
 488
 489         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 490         if (!rt) {
 491                 pr_info("no route to ipv4 0x%x, port %u.\n",
 492                         daddr->sin_addr.s_addr, daddr->sin_port);
 493                 err = -ENETUNREACH;
 494                 goto err_out;
 495         }
 496         dst = &rt->dst;
 497         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 498         if (!n) {
 499                 err = -ENODEV;
 500                 goto rel_rt;
 501         }
 502         ndev = n->dev;
 503
 504         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 505                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 506                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 507                         ndev->name);
 508                 err = -ENETUNREACH;
 509                 goto rel_neigh;
 510         }
 511
 512         if (ndev->flags & IFF_LOOPBACK) {
 513                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 514                 mtu = ndev->mtu;
 515                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 516                         n->dev->name, ndev->name, mtu);
 517         }
 518
 519         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 520         if (!cdev) {
 521                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 522                         &daddr->sin_addr.s_addr, ndev->name);
 523                 err = -ENETUNREACH;
 524                 goto rel_neigh;
 525         }
 526         log_debug(1 << CXGBI_DBG_SOCK,
 527                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 528                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 529                            port, ndev->name, cdev);
 530
 531         csk = cxgbi_sock_create(cdev);
 532         if (!csk) {
 533                 err = -ENOMEM;
 534                 goto rel_neigh;
 535         }
 536         csk->cdev = cdev;
 537         csk->port_id = port;
 538         csk->mtu = mtu;
 539         csk->dst = dst;
 540         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 541         csk->daddr.sin_port = daddr->sin_port;
 542         csk->daddr.sin_family = daddr->sin_family;
 543         csk->saddr.sin_addr.s_addr = fl4.saddr;
 544         neigh_release(n);
 545
 546         return csk;
 547
 548 rel_neigh:
 549         neigh_release(n);
 550
 551 rel_rt:
 552         ip_rt_put(rt);
 553         if (csk)
 554                 cxgbi_sock_closed(csk);
 555 err_out:
 556         return ERR_PTR(err);
 557 }
 558
 559 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 560                         unsigned int opt)
 561 {
 562         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 563         dst_confirm(csk->dst);
 564         smp_mb();
 565         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 566 }
 567 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 568
 569 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 570 {
 571         log_debug(1 << CXGBI_DBG_SOCK,
 572                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 573                 csk, csk->state, csk->flags, csk->user_data);
 574
 575         if (csk->state != CTP_ESTABLISHED) {
 576                 read_lock_bh(&csk->callback_lock);
 577                 if (csk->user_data)
 578                         iscsi_conn_failure(csk->user_data,
 579                                         ISCSI_ERR_CONN_FAILED);
 580                 read_unlock_bh(&csk->callback_lock);
 581         }
 582 }
 583
 584 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 585 {
 586         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 587                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 588         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 589         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 590                 return;
 591         if (csk->saddr.sin_port)
 592                 sock_put_port(csk);
 593         if (csk->dst)
 594                 dst_release(csk->dst);
 595         csk->cdev->csk_release_offload_resources(csk);
 596         cxgbi_sock_set_state(csk, CTP_CLOSED);
 597         cxgbi_inform_iscsi_conn_closing(csk);
 598         cxgbi_sock_put(csk);
 599 }
 600 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 601
 602 static void need_active_close(struct cxgbi_sock *csk)
 603 {
 604         int data_lost;
 605         int close_req = 0;
 606
 607         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 608                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 609         spin_lock_bh(&csk->lock);
 610         dst_confirm(csk->dst);
 611         data_lost = skb_queue_len(&csk->receive_queue);
 612         __skb_queue_purge(&csk->receive_queue);
 613
 614         if (csk->state == CTP_ACTIVE_OPEN)
 615                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 616         else if (csk->state == CTP_ESTABLISHED) {
 617                 close_req = 1;
 618                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 619         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 620                 close_req = 1;
 621                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 622         }
 623
 624         if (close_req) {
 625                 if (data_lost)
 626                         csk->cdev->csk_send_abort_req(csk);
 627                 else
 628                         csk->cdev->csk_send_close_req(csk);
 629         }
 630
 631         spin_unlock_bh(&csk->lock);
 632 }
 633
 634 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 635 {
 636         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 637                         csk, csk->state, csk->flags,
 638                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 639                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 640                         errno);
 641
 642         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 643         csk->err = errno;
 644         cxgbi_sock_closed(csk);
 645 }
 646 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 647
 648 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 649 {
 650         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 651
 652         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 653                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 654         cxgbi_sock_get(csk);
 655         spin_lock_bh(&csk->lock);
 656         if (csk->state == CTP_ACTIVE_OPEN)
 657                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 658         spin_unlock_bh(&csk->lock);
 659         cxgbi_sock_put(csk);
 660         __kfree_skb(skb);
 661 }
 662 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 663
 664 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 665 {
 666         cxgbi_sock_get(csk);
 667         spin_lock_bh(&csk->lock);
 668         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 669                 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
 670                         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 671                 else {
 672                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
 673                         cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 674                         if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 675                                 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 676                                         csk, csk->state, csk->flags, csk->tid);
 677                         cxgbi_sock_closed(csk);
 678                 }
 679         }
 680         spin_unlock_bh(&csk->lock);
 681         cxgbi_sock_put(csk);
 682 }
 683 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 684
 685 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 686 {
 687         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 688                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 689         cxgbi_sock_get(csk);
 690         spin_lock_bh(&csk->lock);
 691
 692         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 693                 goto done;
 694
 695         switch (csk->state) {
 696         case CTP_ESTABLISHED:
 697                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 698                 break;
 699         case CTP_ACTIVE_CLOSE:
 700                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 701                 break;
 702         case CTP_CLOSE_WAIT_1:
 703                 cxgbi_sock_closed(csk);
 704                 break;
 705         case CTP_ABORTING:
 706                 break;
 707         default:
 708                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 709                         csk, csk->state, csk->flags, csk->tid);
 710         }
 711         cxgbi_inform_iscsi_conn_closing(csk);
 712 done:
 713         spin_unlock_bh(&csk->lock);
 714         cxgbi_sock_put(csk);
 715 }
 716 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 717
 718 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 719 {
 720         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 721                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 722         cxgbi_sock_get(csk);
 723         spin_lock_bh(&csk->lock);
 724
 725         csk->snd_una = snd_nxt - 1;
 726         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 727                 goto done;
 728
 729         switch (csk->state) {
 730         case CTP_ACTIVE_CLOSE:
 731                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 732                 break;
 733         case CTP_CLOSE_WAIT_1:
 734         case CTP_CLOSE_WAIT_2:
 735                 cxgbi_sock_closed(csk);
 736                 break;
 737         case CTP_ABORTING:
 738                 break;
 739         default:
 740                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 741                         csk, csk->state, csk->flags, csk->tid);
 742         }
 743 done:
 744         spin_unlock_bh(&csk->lock);
 745         cxgbi_sock_put(csk);
 746 }
 747 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
 748
 749 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
 750                            unsigned int snd_una, int seq_chk)
 751 {
 752         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 753                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
 754                         csk, csk->state, csk->flags, csk->tid, credits,
 755                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
 756
 757         spin_lock_bh(&csk->lock);
 758
 759         csk->wr_cred += credits;
 760         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
 761                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
 762
 763         while (credits) {
 764                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
 765
 766                 if (unlikely(!p)) {
 767                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
 768                                 csk, csk->state, csk->flags, csk->tid, credits,
 769                                 csk->wr_cred, csk->wr_una_cred);
 770                         break;
 771                 }
 772
 773                 if (unlikely(credits < p->csum)) {
 774                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
 775                                 csk, csk->state, csk->flags, csk->tid,
 776                                 credits, csk->wr_cred, csk->wr_una_cred,
 777                                 p->csum);
 778                         p->csum -= credits;
 779                         break;
 780                 } else {
 781                         cxgbi_sock_dequeue_wr(csk);
 782                         credits -= p->csum;
 783                         kfree_skb(p);
 784                 }
 785         }
 786
 787         cxgbi_sock_check_wr_invariants(csk);
 788
 789         if (seq_chk) {
 790                 if (unlikely(before(snd_una, csk->snd_una))) {
 791                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
 792                                 csk, csk->state, csk->flags, csk->tid, snd_una,
 793                                 csk->snd_una);
 794                         goto done;
 795                 }
 796
 797                 if (csk->snd_una != snd_una) {
 798                         csk->snd_una = snd_una;
 799                         dst_confirm(csk->dst);
 800                 }
 801         }
 802
 803         if (skb_queue_len(&csk->write_queue)) {
 804                 if (csk->cdev->csk_push_tx_frames(csk, 0))
 805                         cxgbi_conn_tx_open(csk);
 806         } else
 807                 cxgbi_conn_tx_open(csk);
 808 done:
 809         spin_unlock_bh(&csk->lock);
 810 }
 811 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
 812
 813 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
 814                                              unsigned short mtu)
 815 {
 816         int i = 0;
 817
 818         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
 819                 ++i;
 820
 821         return i;
 822 }
 823
 824 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
 825 {
 826         unsigned int idx;
 827         struct dst_entry *dst = csk->dst;
 828
 829         csk->advmss = dst_metric_advmss(dst);
 830
 831         if (csk->advmss > pmtu - 40)
 832                 csk->advmss = pmtu - 40;
 833         if (csk->advmss < csk->cdev->mtus[0] - 40)
 834                 csk->advmss = csk->cdev->mtus[0] - 40;
 835         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
 836
 837         return idx;
 838 }
 839 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
 840
 841 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
 842 {
 843         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
 844         __skb_queue_tail(&csk->write_queue, skb);
 845 }
 846 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
 847
 848 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
 849 {
 850         struct sk_buff *skb;
 851
 852         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
 853                 kfree_skb(skb);
 854 }
 855 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
 856
 857 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
 858 {
 859         int pending = cxgbi_sock_count_pending_wrs(csk);
 860
 861         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
 862                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
 863                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
 864 }
 865 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
 866
 867 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
 868 {
 869         struct cxgbi_device *cdev = csk->cdev;
 870         struct sk_buff *next;
 871         int err, copied = 0;
 872
 873         spin_lock_bh(&csk->lock);
 874
 875         if (csk->state != CTP_ESTABLISHED) {
 876                 log_debug(1 << CXGBI_DBG_PDU_TX,
 877                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
 878                         csk, csk->state, csk->flags, csk->tid);
 879                 err = -EAGAIN;
 880                 goto out_err;
 881         }
 882
 883         if (csk->err) {
 884                 log_debug(1 << CXGBI_DBG_PDU_TX,
 885                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
 886                         csk, csk->state, csk->flags, csk->tid, csk->err);
 887                 err = -EPIPE;
 888                 goto out_err;
 889         }
 890
 891         if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
 892                 log_debug(1 << CXGBI_DBG_PDU_TX,
 893                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
 894                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
 895                         csk->snd_una, cdev->snd_win);
 896                 err = -ENOBUFS;
 897                 goto out_err;
 898         }
 899
 900         while (skb) {
 901                 int frags = skb_shinfo(skb)->nr_frags +
 902                                 (skb->len != skb->data_len);
 903
 904                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
 905                         pr_err("csk 0x%p, skb head %u < %u.\n",
 906                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
 907                         err = -EINVAL;
 908                         goto out_err;
 909                 }
 910
 911                 if (frags >= SKB_WR_LIST_SIZE) {
 912                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
 913                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
 914                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
 915                         err = -EINVAL;
 916                         goto out_err;
 917                 }
 918
 919                 next = skb->next;
 920                 skb->next = NULL;
 921                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
 922                 cxgbi_sock_skb_entail(csk, skb);
 923                 copied += skb->len;
 924                 csk->write_seq += skb->len +
 925                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 926                 skb = next;
 927         }
 928 done:
 929         if (likely(skb_queue_len(&csk->write_queue)))
 930                 cdev->csk_push_tx_frames(csk, 1);
 931         spin_unlock_bh(&csk->lock);
 932         return copied;
 933
 934 out_err:
 935         if (copied == 0 && err == -EPIPE)
 936                 copied = csk->err ? csk->err : -EPIPE;
 937         else
 938                 copied = err;
 939         goto done;
 940 }
 941
 942 /*
 943  * Direct Data Placement -
 944  * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
 945  * final destination host-memory buffers based on the Initiator Task Tag (ITT)
 946  * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
 947  * The host memory address is programmed into h/w in the format of pagepod
 948  * entries.
 949  * The location of the pagepod entry is encoded into ddp tag which is used as
 950  * the base for ITT/TTT.
 951  */
 952
 953 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
 954 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
 955 static unsigned char page_idx = DDP_PGIDX_MAX;
 956
 957 static unsigned char sw_tag_idx_bits;
 958 static unsigned char sw_tag_age_bits;
 959
 960 /*
 961  * Direct-Data Placement page size adjustment
 962  */
 963 static int ddp_adjust_page_table(void)
 964 {
 965         int i;
 966         unsigned int base_order, order;
 967
 968         if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
 969                 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
 970                         PAGE_SIZE, 1UL << ddp_page_shift[0]);
 971                 return -EINVAL;
 972         }
 973
 974         base_order = get_order(1UL << ddp_page_shift[0]);
 975         order = get_order(1UL << PAGE_SHIFT);
 976
 977         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 978                 /* first is the kernel page size, then just doubling */
 979                 ddp_page_order[i] = order - base_order + i;
 980                 ddp_page_shift[i] = PAGE_SHIFT + i;
 981         }
 982         return 0;
 983 }
 984
 985 static int ddp_find_page_index(unsigned long pgsz)
 986 {
 987         int i;
 988
 989         for (i = 0; i < DDP_PGIDX_MAX; i++) {
 990                 if (pgsz == (1UL << ddp_page_shift[i]))
 991                         return i;
 992         }
 993         pr_info("ddp page size %lu not supported.\n", pgsz);
 994         return DDP_PGIDX_MAX;
 995 }
 996
 997 static void ddp_setup_host_page_size(void)
 998 {
 999         if (page_idx == DDP_PGIDX_MAX) {
1000                 page_idx = ddp_find_page_index(PAGE_SIZE);
1001
1002                 if (page_idx == DDP_PGIDX_MAX) {
1003                         pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1004                         if (ddp_adjust_page_table() < 0) {
1005                                 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1006                                 return;
1007                         }
1008                         page_idx = ddp_find_page_index(PAGE_SIZE);
1009                 }
1010                 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1011         }
1012 }
1013
1014 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1015 {
1016         int i;
1017
1018         for (i = 0; i < DDP_PGIDX_MAX; i++)
1019                 pgsz_factor[i] = ddp_page_order[i];
1020 }
1021 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1022
1023 /*
1024  * DDP setup & teardown
1025  */
1026
1027 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1028                         struct cxgbi_pagepod_hdr *hdr,
1029                         struct cxgbi_gather_list *gl, unsigned int gidx)
1030 {
1031         int i;
1032
1033         memcpy(ppod, hdr, sizeof(*hdr));
1034         for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1035                 ppod->addr[i] = gidx < gl->nelem ?
1036                                 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1037         }
1038 }
1039 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1040
1041 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1042 {
1043         memset(ppod, 0, sizeof(*ppod));
1044 }
1045 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1046
1047 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1048                                         unsigned int start, unsigned int max,
1049                                         unsigned int count,
1050                                         struct cxgbi_gather_list *gl)
1051 {
1052         unsigned int i, j, k;
1053
1054         /*  not enough entries */
1055         if ((max - start) < count) {
1056                 log_debug(1 << CXGBI_DBG_DDP,
1057                         "NOT enough entries %u+%u < %u.\n", start, count, max);
1058                 return -EBUSY;
1059         }
1060
1061         max -= count;
1062         spin_lock(&ddp->map_lock);
1063         for (i = start; i < max;) {
1064                 for (j = 0, k = i; j < count; j++, k++) {
1065                         if (ddp->gl_map[k])
1066                                 break;
1067                 }
1068                 if (j == count) {
1069                         for (j = 0, k = i; j < count; j++, k++)
1070                                 ddp->gl_map[k] = gl;
1071                         spin_unlock(&ddp->map_lock);
1072                         return i;
1073                 }
1074                 i += j + 1;
1075         }
1076         spin_unlock(&ddp->map_lock);
1077         log_debug(1 << CXGBI_DBG_DDP,
1078                 "NO suitable entries %u available.\n", count);
1079         return -EBUSY;
1080 }
1081
1082 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1083                                                 int start, int count)
1084 {
1085         spin_lock(&ddp->map_lock);
1086         memset(&ddp->gl_map[start], 0,
1087                 count * sizeof(struct cxgbi_gather_list *));
1088         spin_unlock(&ddp->map_lock);
1089 }
1090
1091 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1092                                         struct cxgbi_gather_list *gl)
1093 {
1094         int i;
1095
1096         for (i = 0; i < gl->nelem; i++)
1097                 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1098                                 PCI_DMA_FROMDEVICE);
1099 }
1100
1101 static inline int ddp_gl_map(struct pci_dev *pdev,
1102                                     struct cxgbi_gather_list *gl)
1103 {
1104         int i;
1105
1106         for (i = 0; i < gl->nelem; i++) {
1107                 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1108                                                 PAGE_SIZE,
1109                                                 PCI_DMA_FROMDEVICE);
1110                 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1111                         log_debug(1 << CXGBI_DBG_DDP,
1112                                 "page %d 0x%p, 0x%p dma mapping err.\n",
1113                                 i, gl->pages[i], pdev);
1114                         goto unmap;
1115                 }
1116         }
1117         return i;
1118 unmap:
1119         if (i) {
1120                 unsigned int nelem = gl->nelem;
1121
1122                 gl->nelem = i;
1123                 ddp_gl_unmap(pdev, gl);
1124                 gl->nelem = nelem;
1125         }
1126         return -EINVAL;
1127 }
1128
1129 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1130                                   struct pci_dev *pdev)
1131 {
1132         ddp_gl_unmap(pdev, gl);
1133         kfree(gl);
1134 }
1135
1136 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1137                                                     struct scatterlist *sgl,
1138                                                     unsigned int sgcnt,
1139                                                     struct pci_dev *pdev,
1140                                                     gfp_t gfp)
1141 {
1142         struct cxgbi_gather_list *gl;
1143         struct scatterlist *sg = sgl;
1144         struct page *sgpage = sg_page(sg);
1145         unsigned int sglen = sg->length;
1146         unsigned int sgoffset = sg->offset;
1147         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1148                                 PAGE_SHIFT;
1149         int i = 1, j = 0;
1150
1151         if (xferlen < DDP_THRESHOLD) {
1152                 log_debug(1 << CXGBI_DBG_DDP,
1153                         "xfer %u < threshold %u, no ddp.\n",
1154                         xferlen, DDP_THRESHOLD);
1155                 return NULL;
1156         }
1157
1158         gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1159                      npages * (sizeof(dma_addr_t) +
1160                      sizeof(struct page *)), gfp);
1161         if (!gl) {
1162                 log_debug(1 << CXGBI_DBG_DDP,
1163                         "xfer %u, %u pages, OOM.\n", xferlen, npages);
1164                 return NULL;
1165         }
1166
1167          log_debug(1 << CXGBI_DBG_DDP,
1168                 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1169
1170         gl->pages = (struct page **)&gl->phys_addr[npages];
1171         gl->nelem = npages;
1172         gl->length = xferlen;
1173         gl->offset = sgoffset;
1174         gl->pages[0] = sgpage;
1175
1176         for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1177                 i++, sg = sg_next(sg)) {
1178                 struct page *page = sg_page(sg);
1179
1180                 if (sgpage == page && sg->offset == sgoffset + sglen)
1181                         sglen += sg->length;
1182                 else {
1183                         /*  make sure the sgl is fit for ddp:
1184                          *  each has the same page size, and
1185                          *  all of the middle pages are used completely
1186                          */
1187                         if ((j && sgoffset) || ((i != sgcnt - 1) &&
1188                             ((sglen + sgoffset) & ~PAGE_MASK))) {
1189                                 log_debug(1 << CXGBI_DBG_DDP,
1190                                         "page %d/%u, %u + %u.\n",
1191                                         i, sgcnt, sgoffset, sglen);
1192                                 goto error_out;
1193                         }
1194
1195                         j++;
1196                         if (j == gl->nelem || sg->offset) {
1197                                 log_debug(1 << CXGBI_DBG_DDP,
1198                                         "page %d/%u, offset %u.\n",
1199                                         j, gl->nelem, sg->offset);
1200                                 goto error_out;
1201                         }
1202                         gl->pages[j] = page;
1203                         sglen = sg->length;
1204                         sgoffset = sg->offset;
1205                         sgpage = page;
1206                 }
1207         }
1208         gl->nelem = ++j;
1209
1210         if (ddp_gl_map(pdev, gl) < 0)
1211                 goto error_out;
1212
1213         return gl;
1214
1215 error_out:
1216         kfree(gl);
1217         return NULL;
1218 }
1219
1220 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1221 {
1222         struct cxgbi_device *cdev = chba->cdev;
1223         struct cxgbi_ddp_info *ddp = cdev->ddp;
1224         u32 idx;
1225
1226         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1227         if (idx < ddp->nppods) {
1228                 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1229                 unsigned int npods;
1230
1231                 if (!gl || !gl->nelem) {
1232                         pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1233                                 tag, idx, gl, gl ? gl->nelem : 0);
1234                         return;
1235                 }
1236                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1237                 log_debug(1 << CXGBI_DBG_DDP,
1238                         "tag 0x%x, release idx %u, npods %u.\n",
1239                         tag, idx, npods);
1240                 cdev->csk_ddp_clear(chba, tag, idx, npods);
1241                 ddp_unmark_entries(ddp, idx, npods);
1242                 ddp_release_gl(gl, ddp->pdev);
1243         } else
1244                 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1245 }
1246
1247 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1248                            u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1249                            gfp_t gfp)
1250 {
1251         struct cxgbi_device *cdev = csk->cdev;
1252         struct cxgbi_ddp_info *ddp = cdev->ddp;
1253         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1254         struct cxgbi_pagepod_hdr hdr;
1255         unsigned int npods;
1256         int idx = -1;
1257         int err = -ENOMEM;
1258         u32 tag;
1259
1260         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1261         if (ddp->idx_last == ddp->nppods)
1262                 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1263                                                         npods, gl);
1264         else {
1265                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1266                                                         ddp->nppods, npods,
1267                                                         gl);
1268                 if (idx < 0 && ddp->idx_last >= npods) {
1269                         idx = ddp_find_unused_entries(ddp, 0,
1270                                 min(ddp->idx_last + npods, ddp->nppods),
1271                                                         npods, gl);
1272                 }
1273         }
1274         if (idx < 0) {
1275                 log_debug(1 << CXGBI_DBG_DDP,
1276                         "xferlen %u, gl %u, npods %u NO DDP.\n",
1277                         gl->length, gl->nelem, npods);
1278                 return idx;
1279         }
1280
1281         tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1282         tag |= idx << PPOD_IDX_SHIFT;
1283
1284         hdr.rsvd = 0;
1285         hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1286         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1287         hdr.max_offset = htonl(gl->length);
1288         hdr.page_offset = htonl(gl->offset);
1289
1290         err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1291         if (err < 0)
1292                 goto unmark_entries;
1293
1294         ddp->idx_last = idx;
1295         log_debug(1 << CXGBI_DBG_DDP,
1296                 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1297                 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1298                 npods);
1299         *tagp = tag;
1300         return 0;
1301
1302 unmark_entries:
1303         ddp_unmark_entries(ddp, idx, npods);
1304         return err;
1305 }
1306
1307 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1308                         unsigned int sw_tag, unsigned int xferlen,
1309                         struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1310 {
1311         struct cxgbi_device *cdev = csk->cdev;
1312         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1313         struct cxgbi_gather_list *gl;
1314         int err;
1315
1316         if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1317             xferlen < DDP_THRESHOLD) {
1318                 log_debug(1 << CXGBI_DBG_DDP,
1319                         "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1320                 return -EINVAL;
1321         }
1322
1323         if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1324                 log_debug(1 << CXGBI_DBG_DDP,
1325                         "sw_tag 0x%x NOT usable.\n", sw_tag);
1326                 return -EINVAL;
1327         }
1328
1329         gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1330         if (!gl)
1331                 return -ENOMEM;
1332
1333         err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1334         if (err < 0)
1335                 ddp_release_gl(gl, cdev->pdev);
1336
1337         return err;
1338 }
1339
1340 static void ddp_destroy(struct kref *kref)
1341 {
1342         struct cxgbi_ddp_info *ddp = container_of(kref,
1343                                                 struct cxgbi_ddp_info,
1344                                                 refcnt);
1345         struct cxgbi_device *cdev = ddp->cdev;
1346         int i = 0;
1347
1348         pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1349
1350         while (i < ddp->nppods) {
1351                 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1352
1353                 if (gl) {
1354                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1355                                         >> PPOD_PAGES_SHIFT;
1356                         pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1357                         kfree(gl);
1358                         i += npods;
1359                 } else
1360                         i++;
1361         }
1362         cxgbi_free_big_mem(ddp);
1363 }
1364
1365 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1366 {
1367         struct cxgbi_ddp_info *ddp = cdev->ddp;
1368
1369         log_debug(1 << CXGBI_DBG_DDP,
1370                 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1371         cdev->ddp = NULL;
1372         if (ddp)
1373                 return kref_put(&ddp->refcnt, ddp_destroy);
1374         return 0;
1375 }
1376 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1377
1378 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1379                    unsigned int llimit, unsigned int ulimit,
1380                    unsigned int max_txsz, unsigned int max_rxsz)
1381 {
1382         struct cxgbi_ddp_info *ddp;
1383         unsigned int ppmax, bits;
1384
1385         ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1386         bits = __ilog2_u32(ppmax) + 1;
1387         if (bits > PPOD_IDX_MAX_SIZE)
1388                 bits = PPOD_IDX_MAX_SIZE;
1389         ppmax = (1 << (bits - 1)) - 1;
1390
1391         ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1392                                 ppmax * (sizeof(struct cxgbi_gather_list *) +
1393                                          sizeof(struct sk_buff *)),
1394                                 GFP_KERNEL);
1395         if (!ddp) {
1396                 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1397                 return -ENOMEM;
1398         }
1399         ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1400         cdev->ddp = ddp;
1401
1402         spin_lock_init(&ddp->map_lock);
1403         kref_init(&ddp->refcnt);
1404
1405         ddp->cdev = cdev;
1406         ddp->pdev = cdev->pdev;
1407         ddp->llimit = llimit;
1408         ddp->ulimit = ulimit;
1409         ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1410         ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1411         ddp->nppods = ppmax;
1412         ddp->idx_last = ppmax;
1413         ddp->idx_bits = bits;
1414         ddp->idx_mask = (1 << bits) - 1;
1415         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1416
1417         cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1418         cdev->tag_format.rsvd_bits = ddp->idx_bits;
1419         cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1420         cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1421
1422         pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1423                 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1424                 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1425                 cdev->tag_format.rsvd_mask);
1426
1427         cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1428                                 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1429         cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1430                                 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1431
1432         log_debug(1 << CXGBI_DBG_DDP,
1433                 "%s max payload size: %u/%u, %u/%u.\n",
1434                 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1435                 cdev->rx_max_size, ddp->max_rxsz);
1436         return 0;
1437 }
1438 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1439
1440 /*
1441  * APIs interacting with open-iscsi libraries
1442  */
1443
1444 static unsigned char padding[4];
1445
1446 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1447 {
1448         struct scsi_cmnd *sc = task->sc;
1449         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1450         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1451         struct cxgbi_hba *chba = cconn->chba;
1452         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1453         u32 tag = ntohl((__force u32)hdr_itt);
1454
1455         log_debug(1 << CXGBI_DBG_DDP,
1456                    "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1457         if (sc &&
1458             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1459             cxgbi_is_ddp_tag(tformat, tag))
1460                 ddp_tag_release(chba, tag);
1461 }
1462
1463 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1464 {
1465         struct scsi_cmnd *sc = task->sc;
1466         struct iscsi_conn *conn = task->conn;
1467         struct iscsi_session *sess = conn->session;
1468         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1469         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1470         struct cxgbi_hba *chba = cconn->chba;
1471         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1472         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1473         u32 tag = 0;
1474         int err = -EINVAL;
1475
1476         if (sc &&
1477             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1478                 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1479                                         scsi_in(sc)->length,
1480                                         scsi_in(sc)->table.sgl,
1481                                         scsi_in(sc)->table.nents,
1482                                         GFP_ATOMIC);
1483                 if (err < 0)
1484                         log_debug(1 << CXGBI_DBG_DDP,
1485                                 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1486                                 cconn->cep->csk, task, scsi_in(sc)->length,
1487                                 scsi_in(sc)->table.nents);
1488         }
1489
1490         if (err < 0)
1491                 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1492         /*  the itt need to sent in big-endian order */
1493         *hdr_itt = (__force itt_t)htonl(tag);
1494
1495         log_debug(1 << CXGBI_DBG_DDP,
1496                 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1497                 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1498         return 0;
1499 }
1500
1501 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1502 {
1503         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1504         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1505         struct cxgbi_device *cdev = cconn->chba->cdev;
1506         u32 tag = ntohl((__force u32) itt);
1507         u32 sw_bits;
1508
1509         sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1510         if (idx)
1511                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1512         if (age)
1513                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1514
1515         log_debug(1 << CXGBI_DBG_DDP,
1516                 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1517                 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1518                 age ? *age : 0xFF);
1519 }
1520 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1521
1522 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1523 {
1524         struct iscsi_conn *conn = csk->user_data;
1525
1526         if (conn) {
1527                 log_debug(1 << CXGBI_DBG_SOCK,
1528                         "csk 0x%p, cid %d.\n", csk, conn->id);
1529                 iscsi_conn_queue_work(conn);
1530         }
1531 }
1532 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1533
1534 /*
1535  * pdu receive, interact with libiscsi_tcp
1536  */
1537 static inline int read_pdu_skb(struct iscsi_conn *conn,
1538                                struct sk_buff *skb,
1539                                unsigned int offset,
1540                                int offloaded)
1541 {
1542         int status = 0;
1543         int bytes_read;
1544
1545         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1546         switch (status) {
1547         case ISCSI_TCP_CONN_ERR:
1548                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1549                           skb, offset, offloaded);
1550                 return -EIO;
1551         case ISCSI_TCP_SUSPENDED:
1552                 log_debug(1 << CXGBI_DBG_PDU_RX,
1553                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1554                         skb, offset, offloaded, bytes_read);
1555                 /* no transfer - just have caller flush queue */
1556                 return bytes_read;
1557         case ISCSI_TCP_SKB_DONE:
1558                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1559                         skb, offset, offloaded);
1560                 /*
1561                  * pdus should always fit in the skb and we should get
1562                  * segment done notifcation.
1563                  */
1564                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1565                 return -EFAULT;
1566         case ISCSI_TCP_SEGMENT_DONE:
1567                 log_debug(1 << CXGBI_DBG_PDU_RX,
1568                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1569                         skb, offset, offloaded, bytes_read);
1570                 return bytes_read;
1571         default:
1572                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1573                         skb, offset, offloaded, status);
1574                 return -EINVAL;
1575         }
1576 }
1577
1578 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1579 {
1580         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1581
1582         log_debug(1 << CXGBI_DBG_PDU_RX,
1583                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1584                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1585
1586         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1587                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1588                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1589                 return -EIO;
1590         }
1591
1592         if (conn->hdrdgst_en &&
1593             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1594                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1595                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1596                 return -EIO;
1597         }
1598
1599         return read_pdu_skb(conn, skb, 0, 0);
1600 }
1601
1602 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1603                              struct sk_buff *skb, unsigned int offset)
1604 {
1605         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1606         bool offloaded = 0;
1607         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1608
1609         log_debug(1 << CXGBI_DBG_PDU_RX,
1610                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1611                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1612
1613         if (conn->datadgst_en &&
1614             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1615                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1616                         conn, lskb, cxgbi_skcb_flags(lskb));
1617                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1618                 return -EIO;
1619         }
1620
1621         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1622                 return 0;
1623
1624         /* coalesced, add header digest length */
1625         if (lskb == skb && conn->hdrdgst_en)
1626                 offset += ISCSI_DIGEST_SIZE;
1627
1628         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1629                 offloaded = 1;
1630
1631         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1632                 log_debug(1 << CXGBI_DBG_PDU_RX,
1633                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1634                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1635                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1636
1637         return read_pdu_skb(conn, skb, offset, offloaded);
1638 }
1639
1640 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1641 {
1642         struct cxgbi_device *cdev = csk->cdev;
1643         int must_send;
1644         u32 credits;
1645
1646         log_debug(1 << CXGBI_DBG_PDU_RX,
1647                 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1648                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1649                 csk->rcv_wup, cdev->rx_credit_thres,
1650                 cdev->rcv_win);
1651
1652         if (csk->state != CTP_ESTABLISHED)
1653                 return;
1654
1655         credits = csk->copied_seq - csk->rcv_wup;
1656         if (unlikely(!credits))
1657                 return;
1658         if (unlikely(cdev->rx_credit_thres == 0))
1659                 return;
1660
1661         must_send = credits + 16384 >= cdev->rcv_win;
1662         if (must_send || credits >= cdev->rx_credit_thres)
1663                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1664 }
1665
1666 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1667 {
1668         struct cxgbi_device *cdev = csk->cdev;
1669         struct iscsi_conn *conn = csk->user_data;
1670         struct sk_buff *skb;
1671         unsigned int read = 0;
1672         int err = 0;
1673
1674         log_debug(1 << CXGBI_DBG_PDU_RX,
1675                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1676
1677         if (unlikely(!conn || conn->suspend_rx)) {
1678                 log_debug(1 << CXGBI_DBG_PDU_RX,
1679                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1680                         csk, conn, conn ? conn->id : 0xFF,
1681                         conn ? conn->suspend_rx : 0xFF);
1682                 return;
1683         }
1684
1685         while (!err) {
1686                 skb = skb_peek(&csk->receive_queue);
1687                 if (!skb ||
1688                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1689                         if (skb)
1690                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1691                                         "skb 0x%p, NOT ready 0x%lx.\n",
1692                                         skb, cxgbi_skcb_flags(skb));
1693                         break;
1694                 }
1695                 __skb_unlink(skb, &csk->receive_queue);
1696
1697                 read += cxgbi_skcb_rx_pdulen(skb);
1698                 log_debug(1 << CXGBI_DBG_PDU_RX,
1699                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1700                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1701                         cxgbi_skcb_rx_pdulen(skb));
1702
1703                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1704                         err = skb_read_pdu_bhs(conn, skb);
1705                         if (err < 0) {
1706                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1707                                         "f 0x%lx, plen %u.\n",
1708                                         csk, skb, skb->len,
1709                                         cxgbi_skcb_flags(skb),
1710                                         cxgbi_skcb_rx_pdulen(skb));
1711                                 goto skb_done;
1712                         }
1713                         err = skb_read_pdu_data(conn, skb, skb,
1714                                                 err + cdev->skb_rx_extra);
1715                         if (err < 0)
1716                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1717                                         "f 0x%lx, plen %u.\n",
1718                                         csk, skb, skb->len,
1719                                         cxgbi_skcb_flags(skb),
1720                                         cxgbi_skcb_rx_pdulen(skb));
1721                 } else {
1722                         err = skb_read_pdu_bhs(conn, skb);
1723                         if (err < 0) {
1724                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1725                                         "f 0x%lx, plen %u.\n",
1726                                         csk, skb, skb->len,
1727                                         cxgbi_skcb_flags(skb),
1728                                         cxgbi_skcb_rx_pdulen(skb));
1729                                 goto skb_done;
1730                         }
1731
1732                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1733                                 struct sk_buff *dskb;
1734
1735                                 dskb = skb_peek(&csk->receive_queue);
1736                                 if (!dskb) {
1737                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1738                                                 " plen %u, NO data.\n",
1739                                                 csk, skb, skb->len,
1740                                                 cxgbi_skcb_flags(skb),
1741                                                 cxgbi_skcb_rx_pdulen(skb));
1742                                         err = -EIO;
1743                                         goto skb_done;
1744                                 }
1745                                 __skb_unlink(dskb, &csk->receive_queue);
1746
1747                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1748                                 if (err < 0)
1749                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1750                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1751                                                 "%u.\n",
1752                                                 csk, skb, skb->len,
1753                                                 cxgbi_skcb_flags(skb),
1754                                                 cxgbi_skcb_rx_pdulen(skb),
1755                                                 dskb, dskb->len);
1756                                 __kfree_skb(dskb);
1757                         } else
1758                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1759                 }
1760 skb_done:
1761                 __kfree_skb(skb);
1762
1763                 if (err < 0)
1764                         break;
1765         }
1766
1767         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1768         if (read) {
1769                 csk->copied_seq += read;
1770                 csk_return_rx_credits(csk, read);
1771                 conn->rxdata_octets += read;
1772         }
1773
1774         if (err < 0) {
1775                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1776                         csk, conn, err, read);
1777                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1778         }
1779 }
1780 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1781
1782 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1783                                 unsigned int offset, unsigned int *off,
1784                                 struct scatterlist **sgp)
1785 {
1786         int i;
1787         struct scatterlist *sg;
1788
1789         for_each_sg(sgl, sg, sgcnt, i) {
1790                 if (offset < sg->length) {
1791                         *off = offset;
1792                         *sgp = sg;
1793                         return 0;
1794                 }
1795                 offset -= sg->length;
1796         }
1797         return -EFAULT;
1798 }
1799
1800 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1801                                 unsigned int dlen, struct page_frag *frags,
1802                                 int frag_max)
1803 {
1804         unsigned int datalen = dlen;
1805         unsigned int sglen = sg->length - sgoffset;
1806         struct page *page = sg_page(sg);
1807         int i;
1808
1809         i = 0;
1810         do {
1811                 unsigned int copy;
1812
1813                 if (!sglen) {
1814                         sg = sg_next(sg);
1815                         if (!sg) {
1816                                 pr_warn("sg %d NULL, len %u/%u.\n",
1817                                         i, datalen, dlen);
1818                                 return -EINVAL;
1819                         }
1820                         sgoffset = 0;
1821                         sglen = sg->length;
1822                         page = sg_page(sg);
1823
1824                 }
1825                 copy = min(datalen, sglen);
1826                 if (i && page == frags[i - 1].page &&
1827                     sgoffset + sg->offset ==
1828                         frags[i - 1].offset + frags[i - 1].size) {
1829                         frags[i - 1].size += copy;
1830                 } else {
1831                         if (i >= frag_max) {
1832                                 pr_warn("too many pages %u, dlen %u.\n",
1833                                         frag_max, dlen);
1834                                 return -EINVAL;
1835                         }
1836
1837                         frags[i].page = page;
1838                         frags[i].offset = sg->offset + sgoffset;
1839                         frags[i].size = copy;
1840                         i++;
1841                 }
1842                 datalen -= copy;
1843                 sgoffset += copy;
1844                 sglen -= copy;
1845         } while (datalen);
1846
1847         return i;
1848 }
1849
1850 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1851 {
1852         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1853         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1854         struct cxgbi_device *cdev = cconn->chba->cdev;
1855         struct iscsi_conn *conn = task->conn;
1856         struct iscsi_tcp_task *tcp_task = task->dd_data;
1857         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1858         struct scsi_cmnd *sc = task->sc;
1859         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1860
1861         tcp_task->dd_data = tdata;
1862         task->hdr = NULL;
1863
1864         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1865             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1866              (opcode == ISCSI_OP_SCSI_CMD &&
1867               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1868                 /* data could goes into skb head */
1869                 headroom += min_t(unsigned int,
1870                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1871                                 conn->max_xmit_dlength);
1872
1873         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1874         if (!tdata->skb) {
1875                 struct cxgbi_sock *csk = cconn->cep->csk;
1876                 struct net_device *ndev = cdev->ports[csk->port_id];
1877                 ndev->stats.tx_dropped++;
1878                 return -ENOMEM;
1879         }
1880
1881         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1882         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1883         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1884
1885         /* data_out uses scsi_cmd's itt */
1886         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1887                 task_reserve_itt(task, &task->hdr->itt);
1888
1889         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1890                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1891                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1892                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1893
1894         return 0;
1895 }
1896 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1897
1898 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1899 {
1900         if (hcrc || dcrc) {
1901                 u8 submode = 0;
1902
1903                 if (hcrc)
1904                         submode |= 1;
1905                 if (dcrc)
1906                         submode |= 2;
1907                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1908         } else
1909                 cxgbi_skcb_ulp_mode(skb) = 0;
1910 }
1911
1912 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1913                               unsigned int count)
1914 {
1915         struct iscsi_conn *conn = task->conn;
1916         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1917         struct sk_buff *skb = tdata->skb;
1918         unsigned int datalen = count;
1919         int i, padlen = iscsi_padding(count);
1920         struct page *pg;
1921
1922         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1923                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1924                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1925                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1926
1927         skb_put(skb, task->hdr_len);
1928         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1929         if (!count)
1930                 return 0;
1931
1932         if (task->sc) {
1933                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1934                 struct scatterlist *sg = NULL;
1935                 int err;
1936
1937                 tdata->offset = offset;
1938                 tdata->count = count;
1939                 err = sgl_seek_offset(
1940                                         sdb->table.sgl, sdb->table.nents,
1941                                         tdata->offset, &tdata->sgoffset, &sg);
1942                 if (err < 0) {
1943                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1944                                 sdb->table.nents, tdata->offset, sdb->length);
1945                         return err;
1946                 }
1947                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1948                                         tdata->frags, MAX_PDU_FRAGS);
1949                 if (err < 0) {
1950                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1951                                 sdb->table.nents, tdata->offset, tdata->count);
1952                         return err;
1953                 }
1954                 tdata->nr_frags = err;
1955
1956                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1957                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1958                         char *dst = skb->data + task->hdr_len;
1959                         struct page_frag *frag = tdata->frags;
1960
1961                         /* data fits in the skb's headroom */
1962                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
1963                                 char *src = kmap_atomic(frag->page);
1964
1965                                 memcpy(dst, src+frag->offset, frag->size);
1966                                 dst += frag->size;
1967                                 kunmap_atomic(src);
1968                         }
1969                         if (padlen) {
1970                                 memset(dst, 0, padlen);
1971                                 padlen = 0;
1972                         }
1973                         skb_put(skb, count + padlen);
1974                 } else {
1975                         /* data fit into frag_list */
1976                         for (i = 0; i < tdata->nr_frags; i++) {
1977                                 __skb_fill_page_desc(skb, i,
1978                                                 tdata->frags[i].page,
1979                                                 tdata->frags[i].offset,
1980                                                 tdata->frags[i].size);
1981                                 skb_frag_ref(skb, i);
1982                         }
1983                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1984                         skb->len += count;
1985                         skb->data_len += count;
1986                         skb->truesize += count;
1987                 }
1988
1989         } else {
1990                 pg = virt_to_page(task->data);
1991
1992                 get_page(pg);
1993                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1994                                         count);
1995                 skb->len += count;
1996                 skb->data_len += count;
1997                 skb->truesize += count;
1998         }
1999
2000         if (padlen) {
2001                 i = skb_shinfo(skb)->nr_frags;
2002                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2003                                 virt_to_page(padding), offset_in_page(padding),
2004                                 padlen);
2005
2006                 skb->data_len += padlen;
2007                 skb->truesize += padlen;
2008                 skb->len += padlen;
2009         }
2010
2011         return 0;
2012 }
2013 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2014
2015 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2016 {
2017         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2018         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2019         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2020         struct sk_buff *skb = tdata->skb;
2021         unsigned int datalen;
2022         int err;
2023
2024         if (!skb) {
2025                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2026                         "task 0x%p, skb NULL.\n", task);
2027                 return 0;
2028         }
2029
2030         datalen = skb->data_len;
2031         tdata->skb = NULL;
2032         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2033         if (err > 0) {
2034                 int pdulen = err;
2035
2036                 log_debug(1 << CXGBI_DBG_PDU_TX,
2037                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2038                         task, task->sc, skb, skb->len, skb->data_len, err);
2039
2040                 if (task->conn->hdrdgst_en)
2041                         pdulen += ISCSI_DIGEST_SIZE;
2042
2043                 if (datalen && task->conn->datadgst_en)
2044                         pdulen += ISCSI_DIGEST_SIZE;
2045
2046                 task->conn->txdata_octets += pdulen;
2047                 return 0;
2048         }
2049
2050         if (err == -EAGAIN || err == -ENOBUFS) {
2051                 log_debug(1 << CXGBI_DBG_PDU_TX,
2052                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2053                         task, skb, skb->len, skb->data_len, err);
2054                 /* reset skb to send when we are called again */
2055                 tdata->skb = skb;
2056                 return err;
2057         }
2058
2059         kfree_skb(skb);
2060         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2061                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2062                 task->itt, skb, skb->len, skb->data_len, err);
2063         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2064         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2065         return err;
2066 }
2067 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2068
2069 void cxgbi_cleanup_task(struct iscsi_task *task)
2070 {
2071         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2072
2073         log_debug(1 << CXGBI_DBG_ISCSI,
2074                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2075                 task, tdata->skb, task->hdr_itt);
2076
2077         /*  never reached the xmit task callout */
2078         if (tdata->skb)
2079                 __kfree_skb(tdata->skb);
2080         memset(tdata, 0, sizeof(*tdata));
2081
2082         task_release_itt(task, task->hdr_itt);
2083         iscsi_tcp_cleanup_task(task);
2084 }
2085 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2086
2087 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2088                                 struct iscsi_stats *stats)
2089 {
2090         struct iscsi_conn *conn = cls_conn->dd_data;
2091
2092         stats->txdata_octets = conn->txdata_octets;
2093         stats->rxdata_octets = conn->rxdata_octets;
2094         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2095         stats->dataout_pdus = conn->dataout_pdus_cnt;
2096         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2097         stats->datain_pdus = conn->datain_pdus_cnt;
2098         stats->r2t_pdus = conn->r2t_pdus_cnt;
2099         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2100         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2101         stats->digest_err = 0;
2102         stats->timeout_err = 0;
2103         stats->custom_length = 1;
2104         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2105         stats->custom[0].value = conn->eh_abort_cnt;
2106 }
2107 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2108
2109 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2110 {
2111         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2112         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2113         struct cxgbi_device *cdev = cconn->chba->cdev;
2114         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2115         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2116         unsigned int max = max(max_def, headroom);
2117
2118         max = min(cconn->chba->cdev->tx_max_size, max);
2119         if (conn->max_xmit_dlength)
2120                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2121         else
2122                 conn->max_xmit_dlength = max;
2123         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2124
2125         return 0;
2126 }
2127
2128 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2129 {
2130         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2131         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2132         unsigned int max = cconn->chba->cdev->rx_max_size;
2133
2134         cxgbi_align_pdu_size(max);
2135
2136         if (conn->max_recv_dlength) {
2137                 if (conn->max_recv_dlength > max) {
2138                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2139                                 conn->max_recv_dlength, max);
2140                         return -EINVAL;
2141                 }
2142                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2143                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2144         } else
2145                 conn->max_recv_dlength = max;
2146
2147         return 0;
2148 }
2149
2150 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2151                         enum iscsi_param param, char *buf, int buflen)
2152 {
2153         struct iscsi_conn *conn = cls_conn->dd_data;
2154         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2155         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2156         struct cxgbi_sock *csk = cconn->cep->csk;
2157         int err;
2158
2159         log_debug(1 << CXGBI_DBG_ISCSI,
2160                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2161                 cls_conn, param, buflen, buf);
2162
2163         switch (param) {
2164         case ISCSI_PARAM_HDRDGST_EN:
2165                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2166                 if (!err && conn->hdrdgst_en)
2167                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2168                                                         conn->hdrdgst_en,
2169                                                         conn->datadgst_en, 0);
2170                 break;
2171         case ISCSI_PARAM_DATADGST_EN:
2172                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2173                 if (!err && conn->datadgst_en)
2174                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2175                                                         conn->hdrdgst_en,
2176                                                         conn->datadgst_en, 0);
2177                 break;
2178         case ISCSI_PARAM_MAX_R2T:
2179                 return iscsi_tcp_set_max_r2t(conn, buf);
2180         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2181                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2182                 if (!err)
2183                         err = cxgbi_conn_max_recv_dlength(conn);
2184                 break;
2185         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2186                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2187                 if (!err)
2188                         err = cxgbi_conn_max_xmit_dlength(conn);
2189                 break;
2190         default:
2191                 return iscsi_set_param(cls_conn, param, buf, buflen);
2192         }
2193         return err;
2194 }
2195 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2196
2197 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2198                        char *buf)
2199 {
2200         struct cxgbi_endpoint *cep = ep->dd_data;
2201         struct cxgbi_sock *csk;
2202         int len;
2203
2204         log_debug(1 << CXGBI_DBG_ISCSI,
2205                 "cls_conn 0x%p, param %d.\n", ep, param);
2206
2207         switch (param) {
2208         case ISCSI_PARAM_CONN_PORT:
2209         case ISCSI_PARAM_CONN_ADDRESS:
2210                 if (!cep)
2211                         return -ENOTCONN;
2212
2213                 csk = cep->csk;
2214                 if (!csk)
2215                         return -ENOTCONN;
2216
2217                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2218                                                  &csk->daddr, param, buf);
2219         default:
2220                 return -ENOSYS;
2221         }
2222         return len;
2223 }
2224 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2225
2226 struct iscsi_cls_conn *
2227 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2228 {
2229         struct iscsi_cls_conn *cls_conn;
2230         struct iscsi_conn *conn;
2231         struct iscsi_tcp_conn *tcp_conn;
2232         struct cxgbi_conn *cconn;
2233
2234         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2235         if (!cls_conn)
2236                 return NULL;
2237
2238         conn = cls_conn->dd_data;
2239         tcp_conn = conn->dd_data;
2240         cconn = tcp_conn->dd_data;
2241         cconn->iconn = conn;
2242
2243         log_debug(1 << CXGBI_DBG_ISCSI,
2244                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2245                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2246
2247         return cls_conn;
2248 }
2249 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2250
2251 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2252                                 struct iscsi_cls_conn *cls_conn,
2253                                 u64 transport_eph, int is_leading)
2254 {
2255         struct iscsi_conn *conn = cls_conn->dd_data;
2256         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2257         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2258         struct iscsi_endpoint *ep;
2259         struct cxgbi_endpoint *cep;
2260         struct cxgbi_sock *csk;
2261         int err;
2262
2263         ep = iscsi_lookup_endpoint(transport_eph);
2264         if (!ep)
2265                 return -EINVAL;
2266
2267         /*  setup ddp pagesize */
2268         cep = ep->dd_data;
2269         csk = cep->csk;
2270         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2271         if (err < 0)
2272                 return err;
2273
2274         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2275         if (err)
2276                 return -EINVAL;
2277
2278         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2279         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2280
2281         write_lock_bh(&csk->callback_lock);
2282         csk->user_data = conn;
2283         cconn->chba = cep->chba;
2284         cconn->cep = cep;
2285         cep->cconn = cconn;
2286         write_unlock_bh(&csk->callback_lock);
2287
2288         cxgbi_conn_max_xmit_dlength(conn);
2289         cxgbi_conn_max_recv_dlength(conn);
2290
2291         log_debug(1 << CXGBI_DBG_ISCSI,
2292                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2293                 cls_session, cls_conn, ep, cconn, csk);
2294         /*  init recv engine */
2295         iscsi_tcp_hdr_recv_prep(tcp_conn);
2296
2297         return 0;
2298 }
2299 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2300
2301 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2302                                                 u16 cmds_max, u16 qdepth,
2303                                                 u32 initial_cmdsn)
2304 {
2305         struct cxgbi_endpoint *cep;
2306         struct cxgbi_hba *chba;
2307         struct Scsi_Host *shost;
2308         struct iscsi_cls_session *cls_session;
2309         struct iscsi_session *session;
2310
2311         if (!ep) {
2312                 pr_err("missing endpoint.\n");
2313                 return NULL;
2314         }
2315
2316         cep = ep->dd_data;
2317         chba = cep->chba;
2318         shost = chba->shost;
2319
2320         BUG_ON(chba != iscsi_host_priv(shost));
2321
2322         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2323                                         cmds_max, 0,
2324                                         sizeof(struct iscsi_tcp_task) +
2325                                         sizeof(struct cxgbi_task_data),
2326                                         initial_cmdsn, ISCSI_MAX_TARGET);
2327         if (!cls_session)
2328                 return NULL;
2329
2330         session = cls_session->dd_data;
2331         if (iscsi_tcp_r2tpool_alloc(session))
2332                 goto remove_session;
2333
2334         log_debug(1 << CXGBI_DBG_ISCSI,
2335                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2336         return cls_session;
2337
2338 remove_session:
2339         iscsi_session_teardown(cls_session);
2340         return NULL;
2341 }
2342 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2343
2344 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2345 {
2346         log_debug(1 << CXGBI_DBG_ISCSI,
2347                 "cls sess 0x%p.\n", cls_session);
2348
2349         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2350         iscsi_session_teardown(cls_session);
2351 }
2352 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2353
2354 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2355                         char *buf, int buflen)
2356 {
2357         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2358
2359         if (!chba->ndev) {
2360                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2361                                 "netdev for host not set.\n");
2362                 return -ENODEV;
2363         }
2364
2365         log_debug(1 << CXGBI_DBG_ISCSI,
2366                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2367                 shost, chba, chba->ndev->name, param, buflen, buf);
2368
2369         switch (param) {
2370         case ISCSI_HOST_PARAM_IPADDRESS:
2371         {
2372                 __be32 addr = in_aton(buf);
2373                 log_debug(1 << CXGBI_DBG_ISCSI,
2374                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2375                 cxgbi_set_iscsi_ipv4(chba, addr);
2376                 return 0;
2377         }
2378         case ISCSI_HOST_PARAM_HWADDRESS:
2379         case ISCSI_HOST_PARAM_NETDEV_NAME:
2380                 return 0;
2381         default:
2382                 return iscsi_host_set_param(shost, param, buf, buflen);
2383         }
2384 }
2385 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2386
2387 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2388                         char *buf)
2389 {
2390         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2391         int len = 0;
2392
2393         if (!chba->ndev) {
2394                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2395                                 "netdev for host not set.\n");
2396                 return -ENODEV;
2397         }
2398
2399         log_debug(1 << CXGBI_DBG_ISCSI,
2400                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2401                 shost, chba, chba->ndev->name, param);
2402
2403         switch (param) {
2404         case ISCSI_HOST_PARAM_HWADDRESS:
2405                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2406                 break;
2407         case ISCSI_HOST_PARAM_NETDEV_NAME:
2408                 len = sprintf(buf, "%s\n", chba->ndev->name);
2409                 break;
2410         case ISCSI_HOST_PARAM_IPADDRESS:
2411         {
2412                 __be32 addr;
2413
2414                 addr = cxgbi_get_iscsi_ipv4(chba);
2415                 len = sprintf(buf, "%pI4", &addr);
2416                 log_debug(1 << CXGBI_DBG_ISCSI,
2417                         "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2418                 break;
2419         }
2420         default:
2421                 return iscsi_host_get_param(shost, param, buf);
2422         }
2423
2424         return len;
2425 }
2426 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2427
2428 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2429                                         struct sockaddr *dst_addr,
2430                                         int non_blocking)
2431 {
2432         struct iscsi_endpoint *ep;
2433         struct cxgbi_endpoint *cep;
2434         struct cxgbi_hba *hba = NULL;
2435         struct cxgbi_sock *csk;
2436         int err = -EINVAL;
2437
2438         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2439                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2440                 shost, non_blocking, dst_addr);
2441
2442         if (shost) {
2443                 hba = iscsi_host_priv(shost);
2444                 if (!hba) {
2445                         pr_info("shost 0x%p, priv NULL.\n", shost);
2446                         goto err_out;
2447                 }
2448         }
2449
2450         csk = cxgbi_check_route(dst_addr);
2451         if (IS_ERR(csk))
2452                 return (struct iscsi_endpoint *)csk;
2453         cxgbi_sock_get(csk);
2454
2455         if (!hba)
2456                 hba = csk->cdev->hbas[csk->port_id];
2457         else if (hba != csk->cdev->hbas[csk->port_id]) {
2458                 pr_info("Could not connect through requested host %u"
2459                         "hba 0x%p != 0x%p (%u).\n",
2460                         shost->host_no, hba,
2461                         csk->cdev->hbas[csk->port_id], csk->port_id);
2462                 err = -ENOSPC;
2463                 goto release_conn;
2464         }
2465
2466         err = sock_get_port(csk);
2467         if (err)
2468                 goto release_conn;
2469
2470         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2471         err = csk->cdev->csk_init_act_open(csk);
2472         if (err)
2473                 goto release_conn;
2474
2475         if (cxgbi_sock_is_closing(csk)) {
2476                 err = -ENOSPC;
2477                 pr_info("csk 0x%p is closing.\n", csk);
2478                 goto release_conn;
2479         }
2480
2481         ep = iscsi_create_endpoint(sizeof(*cep));
2482         if (!ep) {
2483                 err = -ENOMEM;
2484                 pr_info("iscsi alloc ep, OOM.\n");
2485                 goto release_conn;
2486         }
2487
2488         cep = ep->dd_data;
2489         cep->csk = csk;
2490         cep->chba = hba;
2491
2492         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2493                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2494                 ep, cep, csk, hba, hba->ndev->name);
2495         return ep;
2496
2497 release_conn:
2498         cxgbi_sock_put(csk);
2499         cxgbi_sock_closed(csk);
2500 err_out:
2501         return ERR_PTR(err);
2502 }
2503 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2504
2505 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2506 {
2507         struct cxgbi_endpoint *cep = ep->dd_data;
2508         struct cxgbi_sock *csk = cep->csk;
2509
2510         if (!cxgbi_sock_is_established(csk))
2511                 return 0;
2512         return 1;
2513 }
2514 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2515
2516 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2517 {
2518         struct cxgbi_endpoint *cep = ep->dd_data;
2519         struct cxgbi_conn *cconn = cep->cconn;
2520         struct cxgbi_sock *csk = cep->csk;
2521
2522         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2523                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2524                 ep, cep, cconn, csk, csk->state, csk->flags);
2525
2526         if (cconn && cconn->iconn) {
2527                 iscsi_suspend_tx(cconn->iconn);
2528                 write_lock_bh(&csk->callback_lock);
2529                 cep->csk->user_data = NULL;
2530                 cconn->cep = NULL;
2531                 write_unlock_bh(&csk->callback_lock);
2532         }
2533         iscsi_destroy_endpoint(ep);
2534
2535         if (likely(csk->state >= CTP_ESTABLISHED))
2536                 need_active_close(csk);
2537         else
2538                 cxgbi_sock_closed(csk);
2539
2540         cxgbi_sock_put(csk);
2541 }
2542 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2543
2544 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2545                         struct scsi_transport_template **stt)
2546 {
2547         *stt = iscsi_register_transport(itp);
2548         if (*stt == NULL) {
2549                 pr_err("unable to register %s transport 0x%p.\n",
2550                         itp->name, itp);
2551                 return -ENODEV;
2552         }
2553         log_debug(1 << CXGBI_DBG_ISCSI,
2554                 "%s, registered iscsi transport 0x%p.\n",
2555                 itp->name, stt);
2556         return 0;
2557 }
2558 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2559
2560 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2561                         struct scsi_transport_template **stt)
2562 {
2563         if (*stt) {
2564                 log_debug(1 << CXGBI_DBG_ISCSI,
2565                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2566                         itp, itp->name, *stt);
2567                 *stt = NULL;
2568                 iscsi_unregister_transport(itp);
2569         }
2570 }
2571 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2572
2573 umode_t cxgbi_attr_is_visible(int param_type, int param)
2574 {
2575         switch (param_type) {
2576         case ISCSI_HOST_PARAM:
2577                 switch (param) {
2578                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2579                 case ISCSI_HOST_PARAM_HWADDRESS:
2580                 case ISCSI_HOST_PARAM_IPADDRESS:
2581                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2582                         return S_IRUGO;
2583                 default:
2584                         return 0;
2585                 }
2586         case ISCSI_PARAM:
2587                 switch (param) {
2588                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2589                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2590                 case ISCSI_PARAM_HDRDGST_EN:
2591                 case ISCSI_PARAM_DATADGST_EN:
2592                 case ISCSI_PARAM_CONN_ADDRESS:
2593                 case ISCSI_PARAM_CONN_PORT:
2594                 case ISCSI_PARAM_EXP_STATSN:
2595                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2596                 case ISCSI_PARAM_PERSISTENT_PORT:
2597                 case ISCSI_PARAM_PING_TMO:
2598                 case ISCSI_PARAM_RECV_TMO:
2599                 case ISCSI_PARAM_INITIAL_R2T_EN:
2600                 case ISCSI_PARAM_MAX_R2T:
2601                 case ISCSI_PARAM_IMM_DATA_EN:
2602                 case ISCSI_PARAM_FIRST_BURST:
2603                 case ISCSI_PARAM_MAX_BURST:
2604                 case ISCSI_PARAM_PDU_INORDER_EN:
2605                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2606                 case ISCSI_PARAM_ERL:
2607                 case ISCSI_PARAM_TARGET_NAME:
2608                 case ISCSI_PARAM_TPGT:
2609                 case ISCSI_PARAM_USERNAME:
2610                 case ISCSI_PARAM_PASSWORD:
2611                 case ISCSI_PARAM_USERNAME_IN:
2612                 case ISCSI_PARAM_PASSWORD_IN:
2613                 case ISCSI_PARAM_FAST_ABORT:
2614                 case ISCSI_PARAM_ABORT_TMO:
2615                 case ISCSI_PARAM_LU_RESET_TMO:
2616                 case ISCSI_PARAM_TGT_RESET_TMO:
2617                 case ISCSI_PARAM_IFACE_NAME:
2618                 case ISCSI_PARAM_INITIATOR_NAME:
2619                         return S_IRUGO;
2620                 default:
2621                         return 0;
2622                 }
2623         }
2624
2625         return 0;
2626 }
2627 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2628
2629 static int __init libcxgbi_init_module(void)
2630 {
2631         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2632         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2633
2634         pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2635                 ISCSI_ITT_MASK, sw_tag_idx_bits,
2636                 ISCSI_AGE_MASK, sw_tag_age_bits);
2637
2638         ddp_setup_host_page_size();
2639         return 0;
2640 }
2641
2642 static void __exit libcxgbi_exit_module(void)
2643 {
2644         cxgbi_device_unregister_all(0xFF);
2645         return;
2646 }
2647
2648 module_init(libcxgbi_init_module);
2649 module_exit(libcxgbi_exit_module);