drivers/scsi/cxgbi/cxgb4i/cxgb4i.c

   1 /*
   2  * cxgb4i.c: Chelsio 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  *              Rakesh Ranjan (rranjan@chelsio.com)
  12  */
  13
  14 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
  15
  16 #include <linux/module.h>
  17 #include <linux/moduleparam.h>
  18 #include <scsi/scsi_host.h>
  19 #include <net/tcp.h>
  20 #include <net/dst.h>
  21 #include <linux/netdevice.h>
  22
  23 #include "t4_msg.h"
  24 #include "cxgb4.h"
  25 #include "cxgb4_uld.h"
  26 #include "t4fw_api.h"
  27 #include "l2t.h"
  28 #include "cxgb4i.h"
  29
  30 static unsigned int dbg_level;
  31
  32 #include "../libcxgbi.h"
  33
  34 #define DRV_MODULE_NAME         "cxgb4i"
  35 #define DRV_MODULE_DESC         "Chelsio T4 iSCSI Driver"
  36 #define DRV_MODULE_VERSION      "0.9.1"
  37 #define DRV_MODULE_RELDATE      "Aug. 2010"
  38
  39 static char version[] =
  40         DRV_MODULE_DESC " " DRV_MODULE_NAME
  41         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  42
  43 MODULE_AUTHOR("Chelsio Communications, Inc.");
  44 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  45 MODULE_VERSION(DRV_MODULE_VERSION);
  46 MODULE_LICENSE("GPL");
  47
  48 module_param(dbg_level, uint, 0644);
  49 MODULE_PARM_DESC(dbg_level, "Debug flag (default=0)");
  50
  51 static int cxgb4i_rcv_win = 256 * 1024;
  52 module_param(cxgb4i_rcv_win, int, 0644);
  53 MODULE_PARM_DESC(cxgb4i_rcv_win, "TCP reveive window in bytes");
  54
  55 static int cxgb4i_snd_win = 128 * 1024;
  56 module_param(cxgb4i_snd_win, int, 0644);
  57 MODULE_PARM_DESC(cxgb4i_snd_win, "TCP send window in bytes");
  58
  59 static int cxgb4i_rx_credit_thres = 10 * 1024;
  60 module_param(cxgb4i_rx_credit_thres, int, 0644);
  61 MODULE_PARM_DESC(cxgb4i_rx_credit_thres,
  62                 "RX credits return threshold in bytes (default=10KB)");
  63
  64 static unsigned int cxgb4i_max_connect = (8 * 1024);
  65 module_param(cxgb4i_max_connect, uint, 0644);
  66 MODULE_PARM_DESC(cxgb4i_max_connect, "Maximum number of connections");
  67
  68 static unsigned short cxgb4i_sport_base = 20000;
  69 module_param(cxgb4i_sport_base, ushort, 0644);
  70 MODULE_PARM_DESC(cxgb4i_sport_base, "Starting port number (default 20000)");
  71
  72 typedef void (*cxgb4i_cplhandler_func)(struct cxgbi_device *, struct sk_buff *);
  73
  74 static void *t4_uld_add(const struct cxgb4_lld_info *);
  75 static int t4_uld_rx_handler(void *, const __be64 *, const struct pkt_gl *);
  76 static int t4_uld_state_change(void *, enum cxgb4_state state);
  77
  78 static const struct cxgb4_uld_info cxgb4i_uld_info = {
  79         .name = DRV_MODULE_NAME,
  80         .add = t4_uld_add,
  81         .rx_handler = t4_uld_rx_handler,
  82         .state_change = t4_uld_state_change,
  83 };
  84
  85 static struct scsi_host_template cxgb4i_host_template = {
  86         .module         = THIS_MODULE,
  87         .name           = DRV_MODULE_NAME,
  88         .proc_name      = DRV_MODULE_NAME,
  89         .can_queue      = CXGB4I_SCSI_HOST_QDEPTH,
  90         .queuecommand   = iscsi_queuecommand,
  91         .change_queue_depth = iscsi_change_queue_depth,
  92         .sg_tablesize   = SG_ALL,
  93         .max_sectors    = 0xFFFF,
  94         .cmd_per_lun    = ISCSI_DEF_CMD_PER_LUN,
  95         .eh_abort_handler = iscsi_eh_abort,
  96         .eh_device_reset_handler = iscsi_eh_device_reset,
  97         .eh_target_reset_handler = iscsi_eh_recover_target,
  98         .target_alloc   = iscsi_target_alloc,
  99         .use_clustering = DISABLE_CLUSTERING,
 100         .this_id        = -1,
 101 };
 102
 103 static struct iscsi_transport cxgb4i_iscsi_transport = {
 104         .owner          = THIS_MODULE,
 105         .name           = DRV_MODULE_NAME,
 106         .caps           = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
 107                                 CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 108                                 CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
 109         .attr_is_visible        = cxgbi_attr_is_visible,
 110         .get_host_param = cxgbi_get_host_param,
 111         .set_host_param = cxgbi_set_host_param,
 112         /* session management */
 113         .create_session = cxgbi_create_session,
 114         .destroy_session        = cxgbi_destroy_session,
 115         .get_session_param = iscsi_session_get_param,
 116         /* connection management */
 117         .create_conn    = cxgbi_create_conn,
 118         .bind_conn              = cxgbi_bind_conn,
 119         .destroy_conn   = iscsi_tcp_conn_teardown,
 120         .start_conn             = iscsi_conn_start,
 121         .stop_conn              = iscsi_conn_stop,
 122         .get_conn_param = iscsi_conn_get_param,
 123         .set_param      = cxgbi_set_conn_param,
 124         .get_stats      = cxgbi_get_conn_stats,
 125         /* pdu xmit req from user space */
 126         .send_pdu       = iscsi_conn_send_pdu,
 127         /* task */
 128         .init_task      = iscsi_tcp_task_init,
 129         .xmit_task      = iscsi_tcp_task_xmit,
 130         .cleanup_task   = cxgbi_cleanup_task,
 131         /* pdu */
 132         .alloc_pdu      = cxgbi_conn_alloc_pdu,
 133         .init_pdu       = cxgbi_conn_init_pdu,
 134         .xmit_pdu       = cxgbi_conn_xmit_pdu,
 135         .parse_pdu_itt  = cxgbi_parse_pdu_itt,
 136         /* TCP connect/disconnect */
 137         .get_ep_param   = cxgbi_get_ep_param,
 138         .ep_connect     = cxgbi_ep_connect,
 139         .ep_poll        = cxgbi_ep_poll,
 140         .ep_disconnect  = cxgbi_ep_disconnect,
 141         /* Error recovery timeout call */
 142         .session_recovery_timedout = iscsi_session_recovery_timedout,
 143 };
 144
 145 static struct scsi_transport_template *cxgb4i_stt;
 146
 147 /*
 148  * CPL (Chelsio Protocol Language) defines a message passing interface between
 149  * the host driver and Chelsio asic.
 150  * The section below implments CPLs that related to iscsi tcp connection
 151  * open/close/abort and data send/receive.
 152  */
 153 #define DIV_ROUND_UP(n, d)      (((n) + (d) - 1) / (d))
 154 #define RCV_BUFSIZ_MASK         0x3FFU
 155 #define MAX_IMM_TX_PKT_LEN      128
 156
 157 static inline void set_queue(struct sk_buff *skb, unsigned int queue,
 158                                 const struct cxgbi_sock *csk)
 159 {
 160         skb->queue_mapping = queue;
 161 }
 162
 163 static int push_tx_frames(struct cxgbi_sock *, int);
 164
 165 /*
 166  * is_ofld_imm - check whether a packet can be sent as immediate data
 167  * @skb: the packet
 168  *
 169  * Returns true if a packet can be sent as an offload WR with immediate
 170  * data.  We currently use the same limit as for Ethernet packets.
 171  */
 172 static inline int is_ofld_imm(const struct sk_buff *skb)
 173 {
 174         return skb->len <= (MAX_IMM_TX_PKT_LEN -
 175                         sizeof(struct fw_ofld_tx_data_wr));
 176 }
 177
 178 static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
 179                                 struct l2t_entry *e)
 180 {
 181         struct cpl_act_open_req *req;
 182         int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
 183         unsigned long long opt0;
 184         unsigned int opt2;
 185         unsigned int qid_atid = ((unsigned int)csk->atid) |
 186                                  (((unsigned int)csk->rss_qid) << 14);
 187
 188         opt0 = KEEP_ALIVE(1) |
 189                 WND_SCALE(wscale) |
 190                 MSS_IDX(csk->mss_idx) |
 191                 L2T_IDX(((struct l2t_entry *)csk->l2t)->idx) |
 192                 TX_CHAN(csk->tx_chan) |
 193                 SMAC_SEL(csk->smac_idx) |
 194                 ULP_MODE(ULP_MODE_ISCSI) |
 195                 RCV_BUFSIZ(cxgb4i_rcv_win >> 10);
 196         opt2 = RX_CHANNEL(0) |
 197                 RSS_QUEUE_VALID |
 198                 (1 << 20) | (1 << 22) |
 199                 RSS_QUEUE(csk->rss_qid);
 200
 201         set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
 202         req = (struct cpl_act_open_req *)skb->head;
 203
 204         INIT_TP_WR(req, 0);
 205         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
 206                                         qid_atid));
 207         req->local_port = csk->saddr.sin_port;
 208         req->peer_port = csk->daddr.sin_port;
 209         req->local_ip = csk->saddr.sin_addr.s_addr;
 210         req->peer_ip = csk->daddr.sin_addr.s_addr;
 211         req->opt0 = cpu_to_be64(opt0);
 212         req->params = 0;
 213         req->opt2 = cpu_to_be32(opt2);
 214
 215         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 216                 "csk 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
 217                 csk, &req->local_ip, ntohs(req->local_port),
 218                 &req->peer_ip, ntohs(req->peer_port),
 219                 csk->atid, csk->rss_qid);
 220
 221         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 222 }
 223
 224 static void send_close_req(struct cxgbi_sock *csk)
 225 {
 226         struct sk_buff *skb = csk->cpl_close;
 227         struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
 228         unsigned int tid = csk->tid;
 229
 230         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 231                 "csk 0x%p,%u,0x%lx, tid %u.\n",
 232                 csk, csk->state, csk->flags, csk->tid);
 233         csk->cpl_close = NULL;
 234         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
 235         INIT_TP_WR(req, tid);
 236         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
 237         req->rsvd = 0;
 238
 239         cxgbi_sock_skb_entail(csk, skb);
 240         if (csk->state >= CTP_ESTABLISHED)
 241                 push_tx_frames(csk, 1);
 242 }
 243
 244 static void abort_arp_failure(void *handle, struct sk_buff *skb)
 245 {
 246         struct cxgbi_sock *csk = (struct cxgbi_sock *)handle;
 247         struct cpl_abort_req *req;
 248
 249         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 250                 "csk 0x%p,%u,0x%lx, tid %u, abort.\n",
 251                 csk, csk->state, csk->flags, csk->tid);
 252         req = (struct cpl_abort_req *)skb->data;
 253         req->cmd = CPL_ABORT_NO_RST;
 254         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 255 }
 256
 257 static void send_abort_req(struct cxgbi_sock *csk)
 258 {
 259         struct cpl_abort_req *req;
 260         struct sk_buff *skb = csk->cpl_abort_req;
 261
 262         if (unlikely(csk->state == CTP_ABORTING) || !skb || !csk->cdev)
 263                 return;
 264         cxgbi_sock_set_state(csk, CTP_ABORTING);
 265         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
 266         cxgbi_sock_purge_write_queue(csk);
 267
 268         csk->cpl_abort_req = NULL;
 269         req = (struct cpl_abort_req *)skb->head;
 270         set_queue(skb, CPL_PRIORITY_DATA, csk);
 271         req->cmd = CPL_ABORT_SEND_RST;
 272         t4_set_arp_err_handler(skb, csk, abort_arp_failure);
 273         INIT_TP_WR(req, csk->tid);
 274         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
 275         req->rsvd0 = htonl(csk->snd_nxt);
 276         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
 277
 278         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 279                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
 280                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
 281                 req->rsvd1);
 282
 283         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 284 }
 285
 286 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
 287 {
 288         struct sk_buff *skb = csk->cpl_abort_rpl;
 289         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
 290
 291         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 292                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
 293                 csk, csk->state, csk->flags, csk->tid, rst_status);
 294
 295         csk->cpl_abort_rpl = NULL;
 296         set_queue(skb, CPL_PRIORITY_DATA, csk);
 297         INIT_TP_WR(rpl, csk->tid);
 298         OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
 299         rpl->cmd = rst_status;
 300         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 301 }
 302
 303 /*
 304  * CPL connection rx data ack: host ->
 305  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 306  * credits sent.
 307  */
 308 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
 309 {
 310         struct sk_buff *skb;
 311         struct cpl_rx_data_ack *req;
 312
 313         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 314                 "csk 0x%p,%u,0x%lx,%u, credit %u.\n",
 315                 csk, csk->state, csk->flags, csk->tid, credits);
 316
 317         skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
 318         if (!skb) {
 319                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
 320                 return 0;
 321         }
 322         req = (struct cpl_rx_data_ack *)skb->head;
 323
 324         set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
 325         INIT_TP_WR(req, csk->tid);
 326         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
 327                                       csk->tid));
 328         req->credit_dack = cpu_to_be32(RX_CREDITS(credits) | RX_FORCE_ACK(1));
 329         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 330         return credits;
 331 }
 332
 333 /*
 334  * sgl_len - calculates the size of an SGL of the given capacity
 335  * @n: the number of SGL entries
 336  * Calculates the number of flits needed for a scatter/gather list that
 337  * can hold the given number of entries.
 338  */
 339 static inline unsigned int sgl_len(unsigned int n)
 340 {
 341         n--;
 342         return (3 * n) / 2 + (n & 1) + 2;
 343 }
 344
 345 /*
 346  * calc_tx_flits_ofld - calculate # of flits for an offload packet
 347  * @skb: the packet
 348  *
 349  * Returns the number of flits needed for the given offload packet.
 350  * These packets are already fully constructed and no additional headers
 351  * will be added.
 352  */
 353 static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
 354 {
 355         unsigned int flits, cnt;
 356
 357         if (is_ofld_imm(skb))
 358                 return DIV_ROUND_UP(skb->len, 8);
 359         flits = skb_transport_offset(skb) / 8;
 360         cnt = skb_shinfo(skb)->nr_frags;
 361         if (skb->tail != skb->transport_header)
 362                 cnt++;
 363         return flits + sgl_len(cnt);
 364 }
 365
 366 static inline void send_tx_flowc_wr(struct cxgbi_sock *csk)
 367 {
 368         struct sk_buff *skb;
 369         struct fw_flowc_wr *flowc;
 370         int flowclen, i;
 371
 372         flowclen = 80;
 373         skb = alloc_wr(flowclen, 0, GFP_ATOMIC);
 374         flowc = (struct fw_flowc_wr *)skb->head;
 375         flowc->op_to_nparams =
 376                 htonl(FW_WR_OP(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS(8));
 377         flowc->flowid_len16 =
 378                 htonl(FW_WR_LEN16(DIV_ROUND_UP(72, 16)) |
 379                                 FW_WR_FLOWID(csk->tid));
 380         flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
 381         flowc->mnemval[0].val = htonl(csk->cdev->pfvf);
 382         flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
 383         flowc->mnemval[1].val = htonl(csk->tx_chan);
 384         flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
 385         flowc->mnemval[2].val = htonl(csk->tx_chan);
 386         flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
 387         flowc->mnemval[3].val = htonl(csk->rss_qid);
 388         flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
 389         flowc->mnemval[4].val = htonl(csk->snd_nxt);
 390         flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
 391         flowc->mnemval[5].val = htonl(csk->rcv_nxt);
 392         flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
 393         flowc->mnemval[6].val = htonl(cxgb4i_snd_win);
 394         flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
 395         flowc->mnemval[7].val = htonl(csk->advmss);
 396         flowc->mnemval[8].mnemonic = 0;
 397         flowc->mnemval[8].val = 0;
 398         for (i = 0; i < 9; i++) {
 399                 flowc->mnemval[i].r4[0] = 0;
 400                 flowc->mnemval[i].r4[1] = 0;
 401                 flowc->mnemval[i].r4[2] = 0;
 402         }
 403         set_queue(skb, CPL_PRIORITY_DATA, csk);
 404
 405         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 406                 "csk 0x%p, tid 0x%x, %u,%u,%u,%u,%u,%u,%u.\n",
 407                 csk, csk->tid, 0, csk->tx_chan, csk->rss_qid,
 408                 csk->snd_nxt, csk->rcv_nxt, cxgb4i_snd_win,
 409                 csk->advmss);
 410
 411         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 412 }
 413
 414 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
 415                                    int dlen, int len, u32 credits, int compl)
 416 {
 417         struct fw_ofld_tx_data_wr *req;
 418         unsigned int submode = cxgbi_skcb_ulp_mode(skb) & 3;
 419         unsigned int wr_ulp_mode = 0;
 420
 421         req = (struct fw_ofld_tx_data_wr *)__skb_push(skb, sizeof(*req));
 422
 423         if (is_ofld_imm(skb)) {
 424                 req->op_to_immdlen = htonl(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
 425                                         FW_WR_COMPL(1) |
 426                                         FW_WR_IMMDLEN(dlen));
 427                 req->flowid_len16 = htonl(FW_WR_FLOWID(csk->tid) |
 428                                                 FW_WR_LEN16(credits));
 429         } else {
 430                 req->op_to_immdlen =
 431                         cpu_to_be32(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
 432                                         FW_WR_COMPL(1) |
 433                                         FW_WR_IMMDLEN(0));
 434                 req->flowid_len16 =
 435                         cpu_to_be32(FW_WR_FLOWID(csk->tid) |
 436                                         FW_WR_LEN16(credits));
 437         }
 438         if (submode)
 439                 wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE(ULP2_MODE_ISCSI) |
 440                                 FW_OFLD_TX_DATA_WR_ULPSUBMODE(submode);
 441         req->tunnel_to_proxy = htonl(wr_ulp_mode) |
 442                  FW_OFLD_TX_DATA_WR_SHOVE(skb_peek(&csk->write_queue) ? 0 : 1);
 443         req->plen = htonl(len);
 444         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT))
 445                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 446 }
 447
 448 static void arp_failure_skb_discard(void *handle, struct sk_buff *skb)
 449 {
 450         kfree_skb(skb);
 451 }
 452
 453 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
 454 {
 455         int total_size = 0;
 456         struct sk_buff *skb;
 457
 458         if (unlikely(csk->state < CTP_ESTABLISHED ||
 459                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
 460                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK |
 461                          1 << CXGBI_DBG_PDU_TX,
 462                         "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
 463                         csk, csk->state, csk->flags, csk->tid);
 464                 return 0;
 465         }
 466
 467         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
 468                 int dlen = skb->len;
 469                 int len = skb->len;
 470                 unsigned int credits_needed;
 471
 472                 skb_reset_transport_header(skb);
 473                 if (is_ofld_imm(skb))
 474                         credits_needed = DIV_ROUND_UP(dlen +
 475                                         sizeof(struct fw_ofld_tx_data_wr), 16);
 476                 else
 477                         credits_needed = DIV_ROUND_UP(8*calc_tx_flits_ofld(skb)
 478                                         + sizeof(struct fw_ofld_tx_data_wr),
 479                                         16);
 480
 481                 if (csk->wr_cred < credits_needed) {
 482                         log_debug(1 << CXGBI_DBG_PDU_TX,
 483                                 "csk 0x%p, skb %u/%u, wr %d < %u.\n",
 484                                 csk, skb->len, skb->data_len,
 485                                 credits_needed, csk->wr_cred);
 486                         break;
 487                 }
 488                 __skb_unlink(skb, &csk->write_queue);
 489                 set_queue(skb, CPL_PRIORITY_DATA, csk);
 490                 skb->csum = credits_needed;
 491                 csk->wr_cred -= credits_needed;
 492                 csk->wr_una_cred += credits_needed;
 493                 cxgbi_sock_enqueue_wr(csk, skb);
 494
 495                 log_debug(1 << CXGBI_DBG_PDU_TX,
 496                         "csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
 497                         csk, skb->len, skb->data_len, credits_needed,
 498                         csk->wr_cred, csk->wr_una_cred);
 499
 500                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
 501                         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 502                                 send_tx_flowc_wr(csk);
 503                                 skb->csum += 5;
 504                                 csk->wr_cred -= 5;
 505                                 csk->wr_una_cred += 5;
 506                         }
 507                         len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 508                         make_tx_data_wr(csk, skb, dlen, len, credits_needed,
 509                                         req_completion);
 510                         csk->snd_nxt += len;
 511                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
 512                 }
 513                 total_size += skb->truesize;
 514                 t4_set_arp_err_handler(skb, csk, arp_failure_skb_discard);
 515
 516                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 517                         "csk 0x%p,%u,0x%lx,%u, skb 0x%p, %u.\n",
 518                         csk, csk->state, csk->flags, csk->tid, skb, len);
 519
 520                 cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 521         }
 522         return total_size;
 523 }
 524
 525 static inline void free_atid(struct cxgbi_sock *csk)
 526 {
 527         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 528
 529         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
 530                 cxgb4_free_atid(lldi->tids, csk->atid);
 531                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
 532                 cxgbi_sock_put(csk);
 533         }
 534 }
 535
 536 static void do_act_establish(struct cxgbi_device *cdev, struct sk_buff *skb)
 537 {
 538         struct cxgbi_sock *csk;
 539         struct cpl_act_establish *req = (struct cpl_act_establish *)skb->data;
 540         unsigned short tcp_opt = ntohs(req->tcp_opt);
 541         unsigned int tid = GET_TID(req);
 542         unsigned int atid = GET_TID_TID(ntohl(req->tos_atid));
 543         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 544         struct tid_info *t = lldi->tids;
 545         u32 rcv_isn = be32_to_cpu(req->rcv_isn);
 546
 547         csk = lookup_atid(t, atid);
 548         if (unlikely(!csk)) {
 549                 pr_err("NO conn. for atid %u, cdev 0x%p.\n", atid, cdev);
 550                 goto rel_skb;
 551         }
 552
 553         if (csk->atid != atid) {
 554                 pr_err("bad conn atid %u, csk 0x%p,%u,0x%lx,tid %u, atid %u.\n",
 555                         atid, csk, csk->state, csk->flags, csk->tid, csk->atid);
 556                 goto rel_skb;
 557         }
 558
 559         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 560                 "csk 0x%p,%u,0x%lx, tid %u, atid %u, rseq %u.\n",
 561                 csk, csk->state, csk->flags, tid, atid, rcv_isn);
 562
 563         cxgbi_sock_get(csk);
 564         csk->tid = tid;
 565         cxgb4_insert_tid(lldi->tids, csk, tid);
 566         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
 567
 568         free_atid(csk);
 569
 570         spin_lock_bh(&csk->lock);
 571         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
 572                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
 573                         csk, csk->state, csk->flags, csk->tid);
 574
 575         if (csk->retry_timer.function) {
 576                 del_timer(&csk->retry_timer);
 577                 csk->retry_timer.function = NULL;
 578         }
 579
 580         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
 581         /*
 582          * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
 583          * pass through opt0.
 584          */
 585         if (cxgb4i_rcv_win > (RCV_BUFSIZ_MASK << 10))
 586                 csk->rcv_wup -= cxgb4i_rcv_win - (RCV_BUFSIZ_MASK << 10);
 587
 588         csk->advmss = lldi->mtus[GET_TCPOPT_MSS(tcp_opt)] - 40;
 589         if (GET_TCPOPT_TSTAMP(tcp_opt))
 590                 csk->advmss -= 12;
 591         if (csk->advmss < 128)
 592                 csk->advmss = 128;
 593
 594         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 595                 "csk 0x%p, mss_idx %u, advmss %u.\n",
 596                         csk, GET_TCPOPT_MSS(tcp_opt), csk->advmss);
 597
 598         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
 599
 600         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
 601                 send_abort_req(csk);
 602         else {
 603                 if (skb_queue_len(&csk->write_queue))
 604                         push_tx_frames(csk, 0);
 605                 cxgbi_conn_tx_open(csk);
 606         }
 607         spin_unlock_bh(&csk->lock);
 608
 609 rel_skb:
 610         __kfree_skb(skb);
 611 }
 612
 613 static int act_open_rpl_status_to_errno(int status)
 614 {
 615         switch (status) {
 616         case CPL_ERR_CONN_RESET:
 617                 return -ECONNREFUSED;
 618         case CPL_ERR_ARP_MISS:
 619                 return -EHOSTUNREACH;
 620         case CPL_ERR_CONN_TIMEDOUT:
 621                 return -ETIMEDOUT;
 622         case CPL_ERR_TCAM_FULL:
 623                 return -ENOMEM;
 624         case CPL_ERR_CONN_EXIST:
 625                 return -EADDRINUSE;
 626         default:
 627                 return -EIO;
 628         }
 629 }
 630
 631 static void csk_act_open_retry_timer(unsigned long data)
 632 {
 633         struct sk_buff *skb;
 634         struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
 635
 636         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 637                 "csk 0x%p,%u,0x%lx,%u.\n",
 638                 csk, csk->state, csk->flags, csk->tid);
 639
 640         cxgbi_sock_get(csk);
 641         spin_lock_bh(&csk->lock);
 642         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
 643         if (!skb)
 644                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
 645         else {
 646                 skb->sk = (struct sock *)csk;
 647                 t4_set_arp_err_handler(skb, csk,
 648                                         cxgbi_sock_act_open_req_arp_failure);
 649                 send_act_open_req(csk, skb, csk->l2t);
 650         }
 651         spin_unlock_bh(&csk->lock);
 652         cxgbi_sock_put(csk);
 653 }
 654
 655 static void do_act_open_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 656 {
 657         struct cxgbi_sock *csk;
 658         struct cpl_act_open_rpl *rpl = (struct cpl_act_open_rpl *)skb->data;
 659         unsigned int tid = GET_TID(rpl);
 660         unsigned int atid =
 661                 GET_TID_TID(GET_AOPEN_ATID(be32_to_cpu(rpl->atid_status)));
 662         unsigned int status = GET_AOPEN_STATUS(be32_to_cpu(rpl->atid_status));
 663         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 664         struct tid_info *t = lldi->tids;
 665
 666         csk = lookup_atid(t, atid);
 667         if (unlikely(!csk)) {
 668                 pr_err("NO matching conn. atid %u, tid %u.\n", atid, tid);
 669                 goto rel_skb;
 670         }
 671
 672         pr_info("%pI4:%u-%pI4:%u, atid %u,%u, status %u, csk 0x%p,%u,0x%lx.\n",
 673                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
 674                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port),
 675                 atid, tid, status, csk, csk->state, csk->flags);
 676
 677         if (status == CPL_ERR_RTX_NEG_ADVICE)
 678                 goto rel_skb;
 679
 680         if (status && status != CPL_ERR_TCAM_FULL &&
 681             status != CPL_ERR_CONN_EXIST &&
 682             status != CPL_ERR_ARP_MISS)
 683                 cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl));
 684
 685         cxgbi_sock_get(csk);
 686         spin_lock_bh(&csk->lock);
 687
 688         if (status == CPL_ERR_CONN_EXIST &&
 689             csk->retry_timer.function != csk_act_open_retry_timer) {
 690                 csk->retry_timer.function = csk_act_open_retry_timer;
 691                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
 692         } else
 693                 cxgbi_sock_fail_act_open(csk,
 694                                         act_open_rpl_status_to_errno(status));
 695
 696         spin_unlock_bh(&csk->lock);
 697         cxgbi_sock_put(csk);
 698 rel_skb:
 699         __kfree_skb(skb);
 700 }
 701
 702 static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
 703 {
 704         struct cxgbi_sock *csk;
 705         struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
 706         unsigned int tid = GET_TID(req);
 707         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 708         struct tid_info *t = lldi->tids;
 709
 710         csk = lookup_tid(t, tid);
 711         if (unlikely(!csk)) {
 712                 pr_err("can't find connection for tid %u.\n", tid);
 713                 goto rel_skb;
 714         }
 715         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 716                 "csk 0x%p,%u,0x%lx,%u.\n",
 717                 csk, csk->state, csk->flags, csk->tid);
 718         cxgbi_sock_rcv_peer_close(csk);
 719 rel_skb:
 720         __kfree_skb(skb);
 721 }
 722
 723 static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 724 {
 725         struct cxgbi_sock *csk;
 726         struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
 727         unsigned int tid = GET_TID(rpl);
 728         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 729         struct tid_info *t = lldi->tids;
 730
 731         csk = lookup_tid(t, tid);
 732         if (unlikely(!csk)) {
 733                 pr_err("can't find connection for tid %u.\n", tid);
 734                 goto rel_skb;
 735         }
 736         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 737                 "csk 0x%p,%u,0x%lx,%u.\n",
 738                 csk, csk->state, csk->flags, csk->tid);
 739         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
 740 rel_skb:
 741         __kfree_skb(skb);
 742 }
 743
 744 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
 745                                                                 int *need_rst)
 746 {
 747         switch (abort_reason) {
 748         case CPL_ERR_BAD_SYN: /* fall through */
 749         case CPL_ERR_CONN_RESET:
 750                 return csk->state > CTP_ESTABLISHED ?
 751                         -EPIPE : -ECONNRESET;
 752         case CPL_ERR_XMIT_TIMEDOUT:
 753         case CPL_ERR_PERSIST_TIMEDOUT:
 754         case CPL_ERR_FINWAIT2_TIMEDOUT:
 755         case CPL_ERR_KEEPALIVE_TIMEDOUT:
 756                 return -ETIMEDOUT;
 757         default:
 758                 return -EIO;
 759         }
 760 }
 761
 762 static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 763 {
 764         struct cxgbi_sock *csk;
 765         struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
 766         unsigned int tid = GET_TID(req);
 767         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 768         struct tid_info *t = lldi->tids;
 769         int rst_status = CPL_ABORT_NO_RST;
 770
 771         csk = lookup_tid(t, tid);
 772         if (unlikely(!csk)) {
 773                 pr_err("can't find connection for tid %u.\n", tid);
 774                 goto rel_skb;
 775         }
 776
 777         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 778                 "csk 0x%p,%u,0x%lx, tid %u, status 0x%x.\n",
 779                 csk, csk->state, csk->flags, csk->tid, req->status);
 780
 781         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 782             req->status == CPL_ERR_PERSIST_NEG_ADVICE)
 783                 goto rel_skb;
 784
 785         cxgbi_sock_get(csk);
 786         spin_lock_bh(&csk->lock);
 787
 788         if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
 789                 cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
 790                 cxgbi_sock_set_state(csk, CTP_ABORTING);
 791                 goto done;
 792         }
 793
 794         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
 795         send_abort_rpl(csk, rst_status);
 796
 797         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 798                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
 799                 cxgbi_sock_closed(csk);
 800         }
 801 done:
 802         spin_unlock_bh(&csk->lock);
 803         cxgbi_sock_put(csk);
 804 rel_skb:
 805         __kfree_skb(skb);
 806 }
 807
 808 static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 809 {
 810         struct cxgbi_sock *csk;
 811         struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
 812         unsigned int tid = GET_TID(rpl);
 813         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 814         struct tid_info *t = lldi->tids;
 815
 816         csk = lookup_tid(t, tid);
 817         if (!csk)
 818                 goto rel_skb;
 819
 820         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 821                 "status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
 822                 rpl->status, csk, csk ? csk->state : 0,
 823                 csk ? csk->flags : 0UL);
 824
 825         if (rpl->status == CPL_ERR_ABORT_FAILED)
 826                 goto rel_skb;
 827
 828         cxgbi_sock_rcv_abort_rpl(csk);
 829 rel_skb:
 830         __kfree_skb(skb);
 831 }
 832
 833 static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
 834 {
 835         struct cxgbi_sock *csk;
 836         struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
 837         unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
 838         unsigned int tid = GET_TID(cpl);
 839         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 840         struct tid_info *t = lldi->tids;
 841
 842         csk = lookup_tid(t, tid);
 843         if (unlikely(!csk)) {
 844                 pr_err("can't find conn. for tid %u.\n", tid);
 845                 goto rel_skb;
 846         }
 847
 848         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 849                 "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
 850                 csk, csk->state, csk->flags, csk->tid, skb, skb->len,
 851                 pdu_len_ddp);
 852
 853         spin_lock_bh(&csk->lock);
 854
 855         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
 856                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 857                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
 858                         csk, csk->state, csk->flags, csk->tid);
 859                 if (csk->state != CTP_ABORTING)
 860                         goto abort_conn;
 861                 else
 862                         goto discard;
 863         }
 864
 865         cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
 866         cxgbi_skcb_flags(skb) = 0;
 867
 868         skb_reset_transport_header(skb);
 869         __skb_pull(skb, sizeof(*cpl));
 870         __pskb_trim(skb, ntohs(cpl->len));
 871
 872         if (!csk->skb_ulp_lhdr) {
 873                 unsigned char *bhs;
 874                 unsigned int hlen, dlen;
 875
 876                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 877                         "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
 878                         csk, csk->state, csk->flags, csk->tid, skb);
 879                 csk->skb_ulp_lhdr = skb;
 880                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
 881
 882                 if (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt) {
 883                         pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
 884                                 csk->tid, cxgbi_skcb_tcp_seq(skb),
 885                                 csk->rcv_nxt);
 886                         goto abort_conn;
 887                 }
 888
 889                 bhs = skb->data;
 890                 hlen = ntohs(cpl->len);
 891                 dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;
 892
 893                 if ((hlen + dlen) != ISCSI_PDU_LEN(pdu_len_ddp) - 40) {
 894                         pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
 895                                 "mismatch %u != %u + %u, seq 0x%x.\n",
 896                                 csk->tid, ISCSI_PDU_LEN(pdu_len_ddp) - 40,
 897                                 hlen, dlen, cxgbi_skcb_tcp_seq(skb));
 898                         goto abort_conn;
 899                 }
 900
 901                 cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
 902                 if (dlen)
 903                         cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
 904                 csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);
 905
 906                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 907                         "csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
 908                         csk, skb, *bhs, hlen, dlen,
 909                         ntohl(*((unsigned int *)(bhs + 16))),
 910                         ntohl(*((unsigned int *)(bhs + 24))));
 911
 912         } else {
 913                 struct sk_buff *lskb = csk->skb_ulp_lhdr;
 914
 915                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
 916                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 917                         "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
 918                         csk, csk->state, csk->flags, skb, lskb);
 919         }
 920
 921         __skb_queue_tail(&csk->receive_queue, skb);
 922         spin_unlock_bh(&csk->lock);
 923         return;
 924
 925 abort_conn:
 926         send_abort_req(csk);
 927 discard:
 928         spin_unlock_bh(&csk->lock);
 929 rel_skb:
 930         __kfree_skb(skb);
 931 }
 932
 933 static void do_rx_data_ddp(struct cxgbi_device *cdev,
 934                                   struct sk_buff *skb)
 935 {
 936         struct cxgbi_sock *csk;
 937         struct sk_buff *lskb;
 938         struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
 939         unsigned int tid = GET_TID(rpl);
 940         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 941         struct tid_info *t = lldi->tids;
 942         unsigned int status = ntohl(rpl->ddpvld);
 943
 944         csk = lookup_tid(t, tid);
 945         if (unlikely(!csk)) {
 946                 pr_err("can't find connection for tid %u.\n", tid);
 947                 goto rel_skb;
 948         }
 949
 950         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 951                 "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
 952                 csk, csk->state, csk->flags, skb, status, csk->skb_ulp_lhdr);
 953
 954         spin_lock_bh(&csk->lock);
 955
 956         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
 957                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 958                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
 959                         csk, csk->state, csk->flags, csk->tid);
 960                 if (csk->state != CTP_ABORTING)
 961                         goto abort_conn;
 962                 else
 963                         goto discard;
 964         }
 965
 966         if (!csk->skb_ulp_lhdr) {
 967                 pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
 968                 goto abort_conn;
 969         }
 970
 971         lskb = csk->skb_ulp_lhdr;
 972         csk->skb_ulp_lhdr = NULL;
 973
 974         cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);
 975
 976         if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
 977                 pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
 978                         csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));
 979
 980         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
 981                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
 982                         csk, lskb, status, cxgbi_skcb_flags(lskb));
 983                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_HCRC_ERR);
 984         }
 985         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
 986                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
 987                         csk, lskb, status, cxgbi_skcb_flags(lskb));
 988                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DCRC_ERR);
 989         }
 990         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
 991                 log_debug(1 << CXGBI_DBG_PDU_RX,
 992                         "csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
 993                         csk, lskb, status);
 994                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_PAD_ERR);
 995         }
 996         if ((status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
 997                 !cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA)) {
 998                 log_debug(1 << CXGBI_DBG_PDU_RX,
 999                         "csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
1000                         csk, lskb, status);
1001                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA_DDPD);
1002         }
1003         log_debug(1 << CXGBI_DBG_PDU_RX,
1004                 "csk 0x%p, lskb 0x%p, f 0x%lx.\n",
1005                 csk, lskb, cxgbi_skcb_flags(lskb));
1006
1007         cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
1008         cxgbi_conn_pdu_ready(csk);
1009         spin_unlock_bh(&csk->lock);
1010         goto rel_skb;
1011
1012 abort_conn:
1013         send_abort_req(csk);
1014 discard:
1015         spin_unlock_bh(&csk->lock);
1016 rel_skb:
1017         __kfree_skb(skb);
1018 }
1019
1020 static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
1021 {
1022         struct cxgbi_sock *csk;
1023         struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
1024         unsigned int tid = GET_TID(rpl);
1025         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1026         struct tid_info *t = lldi->tids;
1027
1028         csk = lookup_tid(t, tid);
1029         if (unlikely(!csk))
1030                 pr_err("can't find connection for tid %u.\n", tid);
1031         else {
1032                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1033                         "csk 0x%p,%u,0x%lx,%u.\n",
1034                         csk, csk->state, csk->flags, csk->tid);
1035                 cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
1036                                         rpl->seq_vld);
1037         }
1038         __kfree_skb(skb);
1039 }
1040
1041 static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
1042 {
1043         struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1044         unsigned int tid = GET_TID(rpl);
1045         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1046         struct tid_info *t = lldi->tids;
1047         struct cxgbi_sock *csk;
1048
1049         csk = lookup_tid(t, tid);
1050         if (!csk)
1051                 pr_err("can't find conn. for tid %u.\n", tid);
1052
1053         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1054                 "csk 0x%p,%u,%lx,%u, status 0x%x.\n",
1055                 csk, csk->state, csk->flags, csk->tid, rpl->status);
1056
1057         if (rpl->status != CPL_ERR_NONE)
1058                 pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
1059                         csk, tid, rpl->status);
1060
1061         __kfree_skb(skb);
1062 }
1063
1064 static int alloc_cpls(struct cxgbi_sock *csk)
1065 {
1066         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
1067                                         0, GFP_KERNEL);
1068         if (!csk->cpl_close)
1069                 return -ENOMEM;
1070
1071         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
1072                                         0, GFP_KERNEL);
1073         if (!csk->cpl_abort_req)
1074                 goto free_cpls;
1075
1076         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
1077                                         0, GFP_KERNEL);
1078         if (!csk->cpl_abort_rpl)
1079                 goto free_cpls;
1080         return 0;
1081
1082 free_cpls:
1083         cxgbi_sock_free_cpl_skbs(csk);
1084         return -ENOMEM;
1085 }
1086
1087 static inline void l2t_put(struct cxgbi_sock *csk)
1088 {
1089         if (csk->l2t) {
1090                 cxgb4_l2t_release(csk->l2t);
1091                 csk->l2t = NULL;
1092                 cxgbi_sock_put(csk);
1093         }
1094 }
1095
1096 static void release_offload_resources(struct cxgbi_sock *csk)
1097 {
1098         struct cxgb4_lld_info *lldi;
1099
1100         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1101                 "csk 0x%p,%u,0x%lx,%u.\n",
1102                 csk, csk->state, csk->flags, csk->tid);
1103
1104         cxgbi_sock_free_cpl_skbs(csk);
1105         if (csk->wr_cred != csk->wr_max_cred) {
1106                 cxgbi_sock_purge_wr_queue(csk);
1107                 cxgbi_sock_reset_wr_list(csk);
1108         }
1109
1110         l2t_put(csk);
1111         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
1112                 free_atid(csk);
1113         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
1114                 lldi = cxgbi_cdev_priv(csk->cdev);
1115                 cxgb4_remove_tid(lldi->tids, 0, csk->tid);
1116                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
1117                 cxgbi_sock_put(csk);
1118         }
1119         csk->dst = NULL;
1120         csk->cdev = NULL;
1121 }
1122
1123 static int init_act_open(struct cxgbi_sock *csk)
1124 {
1125         struct cxgbi_device *cdev = csk->cdev;
1126         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1127         struct net_device *ndev = cdev->ports[csk->port_id];
1128         struct port_info *pi = netdev_priv(ndev);
1129         struct sk_buff *skb = NULL;
1130         struct neighbour *n;
1131         unsigned int step;
1132
1133         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1134                 "csk 0x%p,%u,0x%lx,%u.\n",
1135                 csk, csk->state, csk->flags, csk->tid);
1136
1137         csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
1138         if (csk->atid < 0) {
1139                 pr_err("%s, NO atid available.\n", ndev->name);
1140                 return -EINVAL;
1141         }
1142         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
1143         cxgbi_sock_get(csk);
1144
1145         n = dst_get_neighbour_noref(csk->dst);
1146         if (!n) {
1147                 pr_err("%s, can't get neighbour of csk->dst.\n", ndev->name);
1148                 goto rel_resource;
1149         }
1150         csk->l2t = cxgb4_l2t_get(lldi->l2t, n, ndev, 0);
1151         if (!csk->l2t) {
1152                 pr_err("%s, cannot alloc l2t.\n", ndev->name);
1153                 goto rel_resource;
1154         }
1155         cxgbi_sock_get(csk);
1156
1157         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
1158         if (!skb)
1159                 goto rel_resource;
1160         skb->sk = (struct sock *)csk;
1161         t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);
1162
1163         if (!csk->mtu)
1164                 csk->mtu = dst_mtu(csk->dst);
1165         cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
1166         csk->tx_chan = cxgb4_port_chan(ndev);
1167         /* SMT two entries per row */
1168         csk->smac_idx = ((cxgb4_port_viid(ndev) & 0x7F)) << 1;
1169         step = lldi->ntxq / lldi->nchan;
1170         csk->txq_idx = cxgb4_port_idx(ndev) * step;
1171         step = lldi->nrxq / lldi->nchan;
1172         csk->rss_qid = lldi->rxq_ids[cxgb4_port_idx(ndev) * step];
1173         csk->wr_max_cred = csk->wr_cred = lldi->wr_cred;
1174         csk->wr_una_cred = 0;
1175         cxgbi_sock_reset_wr_list(csk);
1176         csk->err = 0;
1177         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1178                 "csk 0x%p,p%d,%s, %u,%u,%u, mss %u,%u, smac %u.\n",
1179                 csk, pi->port_id, ndev->name, csk->tx_chan,
1180                 csk->txq_idx, csk->rss_qid, csk->mtu, csk->mss_idx,
1181                 csk->smac_idx);
1182
1183         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1184         send_act_open_req(csk, skb, csk->l2t);
1185         return 0;
1186
1187 rel_resource:
1188         if (skb)
1189                 __kfree_skb(skb);
1190         return -EINVAL;
1191 }
1192
1193 cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
1194         [CPL_ACT_ESTABLISH] = do_act_establish,
1195         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1196         [CPL_PEER_CLOSE] = do_peer_close,
1197         [CPL_ABORT_REQ_RSS] = do_abort_req_rss,
1198         [CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
1199         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1200         [CPL_FW4_ACK] = do_fw4_ack,
1201         [CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
1202         [CPL_SET_TCB_RPL] = do_set_tcb_rpl,
1203         [CPL_RX_DATA_DDP] = do_rx_data_ddp,
1204 };
1205
1206 int cxgb4i_ofld_init(struct cxgbi_device *cdev)
1207 {
1208         int rc;
1209
1210         if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
1211                 cxgb4i_max_connect = CXGB4I_MAX_CONN;
1212
1213         rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
1214                                         cxgb4i_max_connect);
1215         if (rc < 0)
1216                 return rc;
1217
1218         cdev->csk_release_offload_resources = release_offload_resources;
1219         cdev->csk_push_tx_frames = push_tx_frames;
1220         cdev->csk_send_abort_req = send_abort_req;
1221         cdev->csk_send_close_req = send_close_req;
1222         cdev->csk_send_rx_credits = send_rx_credits;
1223         cdev->csk_alloc_cpls = alloc_cpls;
1224         cdev->csk_init_act_open = init_act_open;
1225
1226         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1227         return 0;
1228 }
1229
1230 /*
1231  * functions to program the pagepod in h/w
1232  */
1233 #define ULPMEM_IDATA_MAX_NPPODS 4 /* 256/PPOD_SIZE */
1234 static inline void ulp_mem_io_set_hdr(struct ulp_mem_io *req,
1235                                 unsigned int wr_len, unsigned int dlen,
1236                                 unsigned int pm_addr)
1237 {
1238         struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);
1239
1240         INIT_ULPTX_WR(req, wr_len, 0, 0);
1241         req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE) | (1 << 23));
1242         req->dlen = htonl(ULP_MEMIO_DATA_LEN(dlen >> 5));
1243         req->lock_addr = htonl(ULP_MEMIO_ADDR(pm_addr >> 5));
1244         req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
1245
1246         idata->cmd_more = htonl(ULPTX_CMD(ULP_TX_SC_IMM));
1247         idata->len = htonl(dlen);
1248 }
1249
1250 static int ddp_ppod_write_idata(struct cxgbi_device *cdev, unsigned int port_id,
1251                                 struct cxgbi_pagepod_hdr *hdr, unsigned int idx,
1252                                 unsigned int npods,
1253                                 struct cxgbi_gather_list *gl,
1254                                 unsigned int gl_pidx)
1255 {
1256         struct cxgbi_ddp_info *ddp = cdev->ddp;
1257         struct sk_buff *skb;
1258         struct ulp_mem_io *req;
1259         struct ulptx_idata *idata;
1260         struct cxgbi_pagepod *ppod;
1261         unsigned int pm_addr = idx * PPOD_SIZE + ddp->llimit;
1262         unsigned int dlen = PPOD_SIZE * npods;
1263         unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
1264                                 sizeof(struct ulptx_idata) + dlen, 16);
1265         unsigned int i;
1266
1267         skb = alloc_wr(wr_len, 0, GFP_ATOMIC);
1268         if (!skb) {
1269                 pr_err("cdev 0x%p, idx %u, npods %u, OOM.\n",
1270                         cdev, idx, npods);
1271                 return -ENOMEM;
1272         }
1273         req = (struct ulp_mem_io *)skb->head;
1274         set_queue(skb, CPL_PRIORITY_CONTROL, NULL);
1275
1276         ulp_mem_io_set_hdr(req, wr_len, dlen, pm_addr);
1277         idata = (struct ulptx_idata *)(req + 1);
1278         ppod = (struct cxgbi_pagepod *)(idata + 1);
1279
1280         for (i = 0; i < npods; i++, ppod++, gl_pidx += PPOD_PAGES_MAX) {
1281                 if (!hdr && !gl)
1282                         cxgbi_ddp_ppod_clear(ppod);
1283                 else
1284                         cxgbi_ddp_ppod_set(ppod, hdr, gl, gl_pidx);
1285         }
1286
1287         cxgb4_ofld_send(cdev->ports[port_id], skb);
1288         return 0;
1289 }
1290
1291 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1292                         unsigned int idx, unsigned int npods,
1293                         struct cxgbi_gather_list *gl)
1294 {
1295         unsigned int i, cnt;
1296         int err = 0;
1297
1298         for (i = 0; i < npods; i += cnt, idx += cnt) {
1299                 cnt = npods - i;
1300                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1301                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1302                 err = ddp_ppod_write_idata(csk->cdev, csk->port_id, hdr,
1303                                         idx, cnt, gl, 4 * i);
1304                 if (err < 0)
1305                         break;
1306         }
1307         return err;
1308 }
1309
1310 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1311                           unsigned int idx, unsigned int npods)
1312 {
1313         unsigned int i, cnt;
1314         int err;
1315
1316         for (i = 0; i < npods; i += cnt, idx += cnt) {
1317                 cnt = npods - i;
1318                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1319                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1320                 err = ddp_ppod_write_idata(chba->cdev, chba->port_id, NULL,
1321                                         idx, cnt, NULL, 0);
1322                 if (err < 0)
1323                         break;
1324         }
1325 }
1326
1327 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
1328                                 int pg_idx, bool reply)
1329 {
1330         struct sk_buff *skb;
1331         struct cpl_set_tcb_field *req;
1332
1333         if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
1334                 return 0;
1335
1336         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1337         if (!skb)
1338                 return -ENOMEM;
1339
1340         /*  set up ulp page size */
1341         req = (struct cpl_set_tcb_field *)skb->head;
1342         INIT_TP_WR(req, csk->tid);
1343         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1344         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1345         req->word_cookie = htons(0);
1346         req->mask = cpu_to_be64(0x3 << 8);
1347         req->val = cpu_to_be64(pg_idx << 8);
1348         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1349
1350         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1351                 "csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);
1352
1353         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1354         return 0;
1355 }
1356
1357 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1358                                  int hcrc, int dcrc, int reply)
1359 {
1360         struct sk_buff *skb;
1361         struct cpl_set_tcb_field *req;
1362
1363         if (!hcrc && !dcrc)
1364                 return 0;
1365
1366         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1367         if (!skb)
1368                 return -ENOMEM;
1369
1370         csk->hcrc_len = (hcrc ? 4 : 0);
1371         csk->dcrc_len = (dcrc ? 4 : 0);
1372         /*  set up ulp submode */
1373         req = (struct cpl_set_tcb_field *)skb->head;
1374         INIT_TP_WR(req, tid);
1375         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1376         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1377         req->word_cookie = htons(0);
1378         req->mask = cpu_to_be64(0x3 << 4);
1379         req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
1380                                 (dcrc ? ULP_CRC_DATA : 0)) << 4);
1381         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1382
1383         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1384                 "csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);
1385
1386         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1387         return 0;
1388 }
1389
1390 static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
1391 {
1392         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1393         struct cxgbi_ddp_info *ddp = cdev->ddp;
1394         unsigned int tagmask, pgsz_factor[4];
1395         int err;
1396
1397         if (ddp) {
1398                 kref_get(&ddp->refcnt);
1399                 pr_warn("cdev 0x%p, ddp 0x%p already set up.\n",
1400                         cdev, cdev->ddp);
1401                 return -EALREADY;
1402         }
1403
1404         err = cxgbi_ddp_init(cdev, lldi->vr->iscsi.start,
1405                         lldi->vr->iscsi.start + lldi->vr->iscsi.size - 1,
1406                         lldi->iscsi_iolen, lldi->iscsi_iolen);
1407         if (err < 0)
1408                 return err;
1409
1410         ddp = cdev->ddp;
1411
1412         tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1413         cxgbi_ddp_page_size_factor(pgsz_factor);
1414         cxgb4_iscsi_init(lldi->ports[0], tagmask, pgsz_factor);
1415
1416         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1417         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1418         cdev->csk_ddp_set = ddp_set_map;
1419         cdev->csk_ddp_clear = ddp_clear_map;
1420
1421         pr_info("cxgb4i 0x%p tag: sw %u, rsvd %u,%u, mask 0x%x.\n",
1422                 cdev, cdev->tag_format.sw_bits, cdev->tag_format.rsvd_bits,
1423                 cdev->tag_format.rsvd_shift, cdev->tag_format.rsvd_mask);
1424         pr_info("cxgb4i 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1425                 " %u/%u.\n",
1426                 cdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1427                 ddp->rsvd_tag_mask, ddp->max_txsz, lldi->iscsi_iolen,
1428                 ddp->max_rxsz, lldi->iscsi_iolen);
1429         pr_info("cxgb4i 0x%p max payload size: %u/%u, %u/%u.\n",
1430                 cdev, cdev->tx_max_size, ddp->max_txsz, cdev->rx_max_size,
1431                 ddp->max_rxsz);
1432         return 0;
1433 }
1434
1435 static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
1436 {
1437         struct cxgbi_device *cdev;
1438         struct port_info *pi;
1439         int i, rc;
1440
1441         cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
1442         if (!cdev) {
1443                 pr_info("t4 device 0x%p, register failed.\n", lldi);
1444                 return NULL;
1445         }
1446         pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
1447                 cdev, lldi->adapter_type, lldi->nports,
1448                 lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
1449                 lldi->nrxq, lldi->wr_cred);
1450         for (i = 0; i < lldi->nrxq; i++)
1451                 log_debug(1 << CXGBI_DBG_DEV,
1452                         "t4 0x%p, rxq id #%d: %u.\n",
1453                         cdev, i, lldi->rxq_ids[i]);
1454
1455         memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
1456         cdev->flags = CXGBI_FLAG_DEV_T4;
1457         cdev->pdev = lldi->pdev;
1458         cdev->ports = lldi->ports;
1459         cdev->nports = lldi->nports;
1460         cdev->mtus = lldi->mtus;
1461         cdev->nmtus = NMTUS;
1462         cdev->snd_win = cxgb4i_snd_win;
1463         cdev->rcv_win = cxgb4i_rcv_win;
1464         cdev->rx_credit_thres = cxgb4i_rx_credit_thres;
1465         cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
1466         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
1467         cdev->itp = &cxgb4i_iscsi_transport;
1468
1469         cdev->pfvf = FW_VIID_PFN_GET(cxgb4_port_viid(lldi->ports[0])) << 8;
1470         pr_info("cdev 0x%p,%s, pfvf %u.\n",
1471                 cdev, lldi->ports[0]->name, cdev->pfvf);
1472
1473         rc = cxgb4i_ddp_init(cdev);
1474         if (rc) {
1475                 pr_info("t4 0x%p ddp init failed.\n", cdev);
1476                 goto err_out;
1477         }
1478         rc = cxgb4i_ofld_init(cdev);
1479         if (rc) {
1480                 pr_info("t4 0x%p ofld init failed.\n", cdev);
1481                 goto err_out;
1482         }
1483
1484         rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
1485                                 &cxgb4i_host_template, cxgb4i_stt);
1486         if (rc)
1487                 goto err_out;
1488
1489         for (i = 0; i < cdev->nports; i++) {
1490                 pi = netdev_priv(lldi->ports[i]);
1491                 cdev->hbas[i]->port_id = pi->port_id;
1492         }
1493         return cdev;
1494
1495 err_out:
1496         cxgbi_device_unregister(cdev);
1497         return ERR_PTR(-ENOMEM);
1498 }
1499
1500 #define RX_PULL_LEN     128
1501 static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
1502                                 const struct pkt_gl *pgl)
1503 {
1504         const struct cpl_act_establish *rpl;
1505         struct sk_buff *skb;
1506         unsigned int opc;
1507         struct cxgbi_device *cdev = handle;
1508
1509         if (pgl == NULL) {
1510                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1511
1512                 skb = alloc_wr(len, 0, GFP_ATOMIC);
1513                 if (!skb)
1514                         goto nomem;
1515                 skb_copy_to_linear_data(skb, &rsp[1], len);
1516         } else {
1517                 if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
1518                         pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
1519                                 pgl->va, be64_to_cpu(*rsp),
1520                                 be64_to_cpu(*(u64 *)pgl->va),
1521                                 pgl->tot_len);
1522                         return 0;
1523                 }
1524                 skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
1525                 if (unlikely(!skb))
1526                         goto nomem;
1527         }
1528
1529         rpl = (struct cpl_act_establish *)skb->data;
1530         opc = rpl->ot.opcode;
1531         log_debug(1 << CXGBI_DBG_TOE,
1532                 "cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
1533                  cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
1534         if (cxgb4i_cplhandlers[opc])
1535                 cxgb4i_cplhandlers[opc](cdev, skb);
1536         else {
1537                 pr_err("No handler for opcode 0x%x.\n", opc);
1538                 __kfree_skb(skb);
1539         }
1540         return 0;
1541 nomem:
1542         log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
1543         return 1;
1544 }
1545
1546 static int t4_uld_state_change(void *handle, enum cxgb4_state state)
1547 {
1548         struct cxgbi_device *cdev = handle;
1549
1550         switch (state) {
1551         case CXGB4_STATE_UP:
1552                 pr_info("cdev 0x%p, UP.\n", cdev);
1553                 /* re-initialize */
1554                 break;
1555         case CXGB4_STATE_START_RECOVERY:
1556                 pr_info("cdev 0x%p, RECOVERY.\n", cdev);
1557                 /* close all connections */
1558                 break;
1559         case CXGB4_STATE_DOWN:
1560                 pr_info("cdev 0x%p, DOWN.\n", cdev);
1561                 break;
1562         case CXGB4_STATE_DETACH:
1563                 pr_info("cdev 0x%p, DETACH.\n", cdev);
1564                 break;
1565         default:
1566                 pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
1567                 break;
1568         }
1569         return 0;
1570 }
1571
1572 static int __init cxgb4i_init_module(void)
1573 {
1574         int rc;
1575
1576         printk(KERN_INFO "%s", version);
1577
1578         rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1579         if (rc < 0)
1580                 return rc;
1581         cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
1582         return 0;
1583 }
1584
1585 static void __exit cxgb4i_exit_module(void)
1586 {
1587         cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
1588         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
1589         cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1590 }
1591
1592 module_init(cxgb4i_init_module);
1593 module_exit(cxgb4i_exit_module);