drivers/infiniband/hw/cxgb3/iwch.c

   1 /*
   2  * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32 #include <linux/module.h>
  33 #include <linux/moduleparam.h>
  34
  35 #include <rdma/ib_verbs.h>
  36
  37 #include "cxgb3_offload.h"
  38 #include "iwch_provider.h"
  39 #include <rdma/cxgb3-abi.h>
  40 #include "iwch.h"
  41 #include "iwch_cm.h"
  42
  43 #define DRV_VERSION "1.1"
  44
  45 MODULE_AUTHOR("Boyd Faulkner, Steve Wise");
  46 MODULE_DESCRIPTION("Chelsio T3 RDMA Driver");
  47 MODULE_LICENSE("Dual BSD/GPL");
  48
  49 static void open_rnic_dev(struct t3cdev *);
  50 static void close_rnic_dev(struct t3cdev *);
  51 static void iwch_event_handler(struct t3cdev *, u32, u32);
  52
  53 struct cxgb3_client t3c_client = {
  54         .name = "iw_cxgb3",
  55         .add = open_rnic_dev,
  56         .remove = close_rnic_dev,
  57         .handlers = t3c_handlers,
  58         .redirect = iwch_ep_redirect,
  59         .event_handler = iwch_event_handler
  60 };
  61
  62 static LIST_HEAD(dev_list);
  63 static DEFINE_MUTEX(dev_mutex);
  64
  65 static void disable_dbs(struct iwch_dev *rnicp)
  66 {
  67         unsigned long index;
  68         struct iwch_qp *qhp;
  69
  70         xa_lock_irq(&rnicp->qps);
  71         xa_for_each(&rnicp->qps, index, qhp)
  72                 cxio_disable_wq_db(&qhp->wq);
  73         xa_unlock_irq(&rnicp->qps);
  74 }
  75
  76 static void enable_dbs(struct iwch_dev *rnicp, int ring_db)
  77 {
  78         unsigned long index;
  79         struct iwch_qp *qhp;
  80
  81         xa_lock_irq(&rnicp->qps);
  82         xa_for_each(&rnicp->qps, index, qhp) {
  83                 if (ring_db)
  84                         ring_doorbell(qhp->rhp->rdev.ctrl_qp.doorbell,
  85                                         qhp->wq.qpid);
  86                 cxio_enable_wq_db(&qhp->wq);
  87         }
  88         xa_unlock_irq(&rnicp->qps);
  89 }
  90
  91 static void iwch_db_drop_task(struct work_struct *work)
  92 {
  93         struct iwch_dev *rnicp = container_of(work, struct iwch_dev,
  94                                               db_drop_task.work);
  95         enable_dbs(rnicp, 1);
  96 }
  97
  98 static void rnic_init(struct iwch_dev *rnicp)
  99 {
 100         pr_debug("%s iwch_dev %p\n", __func__,  rnicp);
 101         xa_init_flags(&rnicp->cqs, XA_FLAGS_LOCK_IRQ);
 102         xa_init_flags(&rnicp->qps, XA_FLAGS_LOCK_IRQ);
 103         xa_init_flags(&rnicp->mrs, XA_FLAGS_LOCK_IRQ);
 104         INIT_DELAYED_WORK(&rnicp->db_drop_task, iwch_db_drop_task);
 105
 106         rnicp->attr.max_qps = T3_MAX_NUM_QP - 32;
 107         rnicp->attr.max_wrs = T3_MAX_QP_DEPTH;
 108         rnicp->attr.max_sge_per_wr = T3_MAX_SGE;
 109         rnicp->attr.max_sge_per_rdma_write_wr = T3_MAX_SGE;
 110         rnicp->attr.max_cqs = T3_MAX_NUM_CQ - 1;
 111         rnicp->attr.max_cqes_per_cq = T3_MAX_CQ_DEPTH;
 112         rnicp->attr.max_mem_regs = cxio_num_stags(&rnicp->rdev);
 113         rnicp->attr.max_phys_buf_entries = T3_MAX_PBL_SIZE;
 114         rnicp->attr.max_pds = T3_MAX_NUM_PD - 1;
 115         rnicp->attr.mem_pgsizes_bitmask = T3_PAGESIZE_MASK;
 116         rnicp->attr.max_mr_size = T3_MAX_MR_SIZE;
 117         rnicp->attr.can_resize_wq = 0;
 118         rnicp->attr.max_rdma_reads_per_qp = 8;
 119         rnicp->attr.max_rdma_read_resources =
 120             rnicp->attr.max_rdma_reads_per_qp * rnicp->attr.max_qps;
 121         rnicp->attr.max_rdma_read_qp_depth = 8; /* IRD */
 122         rnicp->attr.max_rdma_read_depth =
 123             rnicp->attr.max_rdma_read_qp_depth * rnicp->attr.max_qps;
 124         rnicp->attr.rq_overflow_handled = 0;
 125         rnicp->attr.can_modify_ird = 0;
 126         rnicp->attr.can_modify_ord = 0;
 127         rnicp->attr.max_mem_windows = rnicp->attr.max_mem_regs - 1;
 128         rnicp->attr.stag0_value = 1;
 129         rnicp->attr.zbva_support = 1;
 130         rnicp->attr.local_invalidate_fence = 1;
 131         rnicp->attr.cq_overflow_detection = 1;
 132         return;
 133 }
 134
 135 static void open_rnic_dev(struct t3cdev *tdev)
 136 {
 137         struct iwch_dev *rnicp;
 138
 139         pr_debug("%s t3cdev %p\n", __func__,  tdev);
 140         pr_info_once("Chelsio T3 RDMA Driver - version %s\n", DRV_VERSION);
 141         rnicp = ib_alloc_device(iwch_dev, ibdev);
 142         if (!rnicp) {
 143                 pr_err("Cannot allocate ib device\n");
 144                 return;
 145         }
 146         rnicp->rdev.ulp = rnicp;
 147         rnicp->rdev.t3cdev_p = tdev;
 148
 149         mutex_lock(&dev_mutex);
 150
 151         if (cxio_rdev_open(&rnicp->rdev)) {
 152                 mutex_unlock(&dev_mutex);
 153                 pr_err("Unable to open CXIO rdev\n");
 154                 ib_dealloc_device(&rnicp->ibdev);
 155                 return;
 156         }
 157
 158         rnic_init(rnicp);
 159
 160         list_add_tail(&rnicp->entry, &dev_list);
 161         mutex_unlock(&dev_mutex);
 162
 163         if (iwch_register_device(rnicp)) {
 164                 pr_err("Unable to register device\n");
 165                 close_rnic_dev(tdev);
 166         }
 167         pr_info("Initialized device %s\n",
 168                 pci_name(rnicp->rdev.rnic_info.pdev));
 169         return;
 170 }
 171
 172 static void close_rnic_dev(struct t3cdev *tdev)
 173 {
 174         struct iwch_dev *dev, *tmp;
 175         pr_debug("%s t3cdev %p\n", __func__,  tdev);
 176         mutex_lock(&dev_mutex);
 177         list_for_each_entry_safe(dev, tmp, &dev_list, entry) {
 178                 if (dev->rdev.t3cdev_p == tdev) {
 179                         dev->rdev.flags = CXIO_ERROR_FATAL;
 180                         synchronize_net();
 181                         cancel_delayed_work_sync(&dev->db_drop_task);
 182                         list_del(&dev->entry);
 183                         iwch_unregister_device(dev);
 184                         cxio_rdev_close(&dev->rdev);
 185                         WARN_ON(!xa_empty(&dev->cqs));
 186                         WARN_ON(!xa_empty(&dev->qps));
 187                         WARN_ON(!xa_empty(&dev->mrs));
 188                         ib_dealloc_device(&dev->ibdev);
 189                         break;
 190                 }
 191         }
 192         mutex_unlock(&dev_mutex);
 193 }
 194
 195 static void iwch_event_handler(struct t3cdev *tdev, u32 evt, u32 port_id)
 196 {
 197         struct cxio_rdev *rdev = tdev->ulp;
 198         struct iwch_dev *rnicp;
 199         struct ib_event event;
 200         u32 portnum = port_id + 1;
 201         int dispatch = 0;
 202
 203         if (!rdev)
 204                 return;
 205         rnicp = rdev_to_iwch_dev(rdev);
 206         switch (evt) {
 207         case OFFLOAD_STATUS_DOWN: {
 208                 rdev->flags = CXIO_ERROR_FATAL;
 209                 synchronize_net();
 210                 event.event  = IB_EVENT_DEVICE_FATAL;
 211                 dispatch = 1;
 212                 break;
 213                 }
 214         case OFFLOAD_PORT_DOWN: {
 215                 event.event  = IB_EVENT_PORT_ERR;
 216                 dispatch = 1;
 217                 break;
 218                 }
 219         case OFFLOAD_PORT_UP: {
 220                 event.event  = IB_EVENT_PORT_ACTIVE;
 221                 dispatch = 1;
 222                 break;
 223                 }
 224         case OFFLOAD_DB_FULL: {
 225                 disable_dbs(rnicp);
 226                 break;
 227                 }
 228         case OFFLOAD_DB_EMPTY: {
 229                 enable_dbs(rnicp, 1);
 230                 break;
 231                 }
 232         case OFFLOAD_DB_DROP: {
 233                 unsigned long delay = 1000;
 234                 unsigned short r;
 235
 236                 disable_dbs(rnicp);
 237                 get_random_bytes(&r, 2);
 238                 delay += r & 1023;
 239
 240                 /*
 241                  * delay is between 1000-2023 usecs.
 242                  */
 243                 schedule_delayed_work(&rnicp->db_drop_task,
 244                         usecs_to_jiffies(delay));
 245                 break;
 246                 }
 247         }
 248
 249         if (dispatch) {
 250                 event.device = &rnicp->ibdev;
 251                 event.element.port_num = portnum;
 252                 ib_dispatch_event(&event);
 253         }
 254
 255         return;
 256 }
 257
 258 static int __init iwch_init_module(void)
 259 {
 260         int err;
 261
 262         err = cxio_hal_init();
 263         if (err)
 264                 return err;
 265         err = iwch_cm_init();
 266         if (err)
 267                 return err;
 268         cxio_register_ev_cb(iwch_ev_dispatch);
 269         cxgb3_register_client(&t3c_client);
 270         return 0;
 271 }
 272
 273 static void __exit iwch_exit_module(void)
 274 {
 275         cxgb3_unregister_client(&t3c_client);
 276         cxio_unregister_ev_cb(iwch_ev_dispatch);
 277         iwch_cm_term();
 278         cxio_hal_exit();
 279 }
 280
 281 module_init(iwch_init_module);
 282 module_exit(iwch_exit_module);