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 "iwch_user.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 MODULE_VERSION(DRV_VERSION);
  49
  50 cxgb3_cpl_handler_func t3c_handlers[NUM_CPL_CMDS];
  51
  52 static void open_rnic_dev(struct t3cdev *);
  53 static void close_rnic_dev(struct t3cdev *);
  54 static void iwch_event_handler(struct t3cdev *, u32, u32);
  55
  56 struct cxgb3_client t3c_client = {
  57         .name = "iw_cxgb3",
  58         .add = open_rnic_dev,
  59         .remove = close_rnic_dev,
  60         .handlers = t3c_handlers,
  61         .redirect = iwch_ep_redirect,
  62         .event_handler = iwch_event_handler
  63 };
  64
  65 static LIST_HEAD(dev_list);
  66 static DEFINE_MUTEX(dev_mutex);
  67
  68 static int disable_qp_db(int id, void *p, void *data)
  69 {
  70         struct iwch_qp *qhp = p;
  71
  72         cxio_disable_wq_db(&qhp->wq);
  73         return 0;
  74 }
  75
  76 static int enable_qp_db(int id, void *p, void *data)
  77 {
  78         struct iwch_qp *qhp = p;
  79
  80         if (data)
  81                 ring_doorbell(qhp->rhp->rdev.ctrl_qp.doorbell, qhp->wq.qpid);
  82         cxio_enable_wq_db(&qhp->wq);
  83         return 0;
  84 }
  85
  86 static void disable_dbs(struct iwch_dev *rnicp)
  87 {
  88         spin_lock_irq(&rnicp->lock);
  89         idr_for_each(&rnicp->qpidr, disable_qp_db, NULL);
  90         spin_unlock_irq(&rnicp->lock);
  91 }
  92
  93 static void enable_dbs(struct iwch_dev *rnicp, int ring_db)
  94 {
  95         spin_lock_irq(&rnicp->lock);
  96         idr_for_each(&rnicp->qpidr, enable_qp_db,
  97                      (void *)(unsigned long)ring_db);
  98         spin_unlock_irq(&rnicp->lock);
  99 }
 100
 101 static void iwch_db_drop_task(struct work_struct *work)
 102 {
 103         struct iwch_dev *rnicp = container_of(work, struct iwch_dev,
 104                                               db_drop_task.work);
 105         enable_dbs(rnicp, 1);
 106 }
 107
 108 static void rnic_init(struct iwch_dev *rnicp)
 109 {
 110         PDBG("%s iwch_dev %p\n", __func__,  rnicp);
 111         idr_init(&rnicp->cqidr);
 112         idr_init(&rnicp->qpidr);
 113         idr_init(&rnicp->mmidr);
 114         spin_lock_init(&rnicp->lock);
 115         INIT_DELAYED_WORK(&rnicp->db_drop_task, iwch_db_drop_task);
 116
 117         rnicp->attr.max_qps = T3_MAX_NUM_QP - 32;
 118         rnicp->attr.max_wrs = T3_MAX_QP_DEPTH;
 119         rnicp->attr.max_sge_per_wr = T3_MAX_SGE;
 120         rnicp->attr.max_sge_per_rdma_write_wr = T3_MAX_SGE;
 121         rnicp->attr.max_cqs = T3_MAX_NUM_CQ - 1;
 122         rnicp->attr.max_cqes_per_cq = T3_MAX_CQ_DEPTH;
 123         rnicp->attr.max_mem_regs = cxio_num_stags(&rnicp->rdev);
 124         rnicp->attr.max_phys_buf_entries = T3_MAX_PBL_SIZE;
 125         rnicp->attr.max_pds = T3_MAX_NUM_PD - 1;
 126         rnicp->attr.mem_pgsizes_bitmask = T3_PAGESIZE_MASK;
 127         rnicp->attr.max_mr_size = T3_MAX_MR_SIZE;
 128         rnicp->attr.can_resize_wq = 0;
 129         rnicp->attr.max_rdma_reads_per_qp = 8;
 130         rnicp->attr.max_rdma_read_resources =
 131             rnicp->attr.max_rdma_reads_per_qp * rnicp->attr.max_qps;
 132         rnicp->attr.max_rdma_read_qp_depth = 8; /* IRD */
 133         rnicp->attr.max_rdma_read_depth =
 134             rnicp->attr.max_rdma_read_qp_depth * rnicp->attr.max_qps;
 135         rnicp->attr.rq_overflow_handled = 0;
 136         rnicp->attr.can_modify_ird = 0;
 137         rnicp->attr.can_modify_ord = 0;
 138         rnicp->attr.max_mem_windows = rnicp->attr.max_mem_regs - 1;
 139         rnicp->attr.stag0_value = 1;
 140         rnicp->attr.zbva_support = 1;
 141         rnicp->attr.local_invalidate_fence = 1;
 142         rnicp->attr.cq_overflow_detection = 1;
 143         return;
 144 }
 145
 146 static void open_rnic_dev(struct t3cdev *tdev)
 147 {
 148         struct iwch_dev *rnicp;
 149
 150         PDBG("%s t3cdev %p\n", __func__,  tdev);
 151         printk_once(KERN_INFO MOD "Chelsio T3 RDMA Driver - version %s\n",
 152                        DRV_VERSION);
 153         rnicp = (struct iwch_dev *)ib_alloc_device(sizeof(*rnicp));
 154         if (!rnicp) {
 155                 printk(KERN_ERR MOD "Cannot allocate ib device\n");
 156                 return;
 157         }
 158         rnicp->rdev.ulp = rnicp;
 159         rnicp->rdev.t3cdev_p = tdev;
 160
 161         mutex_lock(&dev_mutex);
 162
 163         if (cxio_rdev_open(&rnicp->rdev)) {
 164                 mutex_unlock(&dev_mutex);
 165                 printk(KERN_ERR MOD "Unable to open CXIO rdev\n");
 166                 ib_dealloc_device(&rnicp->ibdev);
 167                 return;
 168         }
 169
 170         rnic_init(rnicp);
 171
 172         list_add_tail(&rnicp->entry, &dev_list);
 173         mutex_unlock(&dev_mutex);
 174
 175         if (iwch_register_device(rnicp)) {
 176                 printk(KERN_ERR MOD "Unable to register device\n");
 177                 close_rnic_dev(tdev);
 178         }
 179         printk(KERN_INFO MOD "Initialized device %s\n",
 180                pci_name(rnicp->rdev.rnic_info.pdev));
 181         return;
 182 }
 183
 184 static void close_rnic_dev(struct t3cdev *tdev)
 185 {
 186         struct iwch_dev *dev, *tmp;
 187         PDBG("%s t3cdev %p\n", __func__,  tdev);
 188         mutex_lock(&dev_mutex);
 189         list_for_each_entry_safe(dev, tmp, &dev_list, entry) {
 190                 if (dev->rdev.t3cdev_p == tdev) {
 191                         dev->rdev.flags = CXIO_ERROR_FATAL;
 192                         synchronize_net();
 193                         cancel_delayed_work_sync(&dev->db_drop_task);
 194                         list_del(&dev->entry);
 195                         iwch_unregister_device(dev);
 196                         cxio_rdev_close(&dev->rdev);
 197                         idr_destroy(&dev->cqidr);
 198                         idr_destroy(&dev->qpidr);
 199                         idr_destroy(&dev->mmidr);
 200                         ib_dealloc_device(&dev->ibdev);
 201                         break;
 202                 }
 203         }
 204         mutex_unlock(&dev_mutex);
 205 }
 206
 207 static void iwch_event_handler(struct t3cdev *tdev, u32 evt, u32 port_id)
 208 {
 209         struct cxio_rdev *rdev = tdev->ulp;
 210         struct iwch_dev *rnicp;
 211         struct ib_event event;
 212         u32 portnum = port_id + 1;
 213         int dispatch = 0;
 214
 215         if (!rdev)
 216                 return;
 217         rnicp = rdev_to_iwch_dev(rdev);
 218         switch (evt) {
 219         case OFFLOAD_STATUS_DOWN: {
 220                 rdev->flags = CXIO_ERROR_FATAL;
 221                 synchronize_net();
 222                 event.event  = IB_EVENT_DEVICE_FATAL;
 223                 dispatch = 1;
 224                 break;
 225                 }
 226         case OFFLOAD_PORT_DOWN: {
 227                 event.event  = IB_EVENT_PORT_ERR;
 228                 dispatch = 1;
 229                 break;
 230                 }
 231         case OFFLOAD_PORT_UP: {
 232                 event.event  = IB_EVENT_PORT_ACTIVE;
 233                 dispatch = 1;
 234                 break;
 235                 }
 236         case OFFLOAD_DB_FULL: {
 237                 disable_dbs(rnicp);
 238                 break;
 239                 }
 240         case OFFLOAD_DB_EMPTY: {
 241                 enable_dbs(rnicp, 1);
 242                 break;
 243                 }
 244         case OFFLOAD_DB_DROP: {
 245                 unsigned long delay = 1000;
 246                 unsigned short r;
 247
 248                 disable_dbs(rnicp);
 249                 get_random_bytes(&r, 2);
 250                 delay += r & 1023;
 251
 252                 /*
 253                  * delay is between 1000-2023 usecs.
 254                  */
 255                 schedule_delayed_work(&rnicp->db_drop_task,
 256                         usecs_to_jiffies(delay));
 257                 break;
 258                 }
 259         }
 260
 261         if (dispatch) {
 262                 event.device = &rnicp->ibdev;
 263                 event.element.port_num = portnum;
 264                 ib_dispatch_event(&event);
 265         }
 266
 267         return;
 268 }
 269
 270 static int __init iwch_init_module(void)
 271 {
 272         int err;
 273
 274         err = cxio_hal_init();
 275         if (err)
 276                 return err;
 277         err = iwch_cm_init();
 278         if (err)
 279                 return err;
 280         cxio_register_ev_cb(iwch_ev_dispatch);
 281         cxgb3_register_client(&t3c_client);
 282         return 0;
 283 }
 284
 285 static void __exit iwch_exit_module(void)
 286 {
 287         cxgb3_unregister_client(&t3c_client);
 288         cxio_unregister_ev_cb(iwch_ev_dispatch);
 289         iwch_cm_term();
 290         cxio_hal_exit();
 291 }
 292
 293 module_init(iwch_init_module);
 294 module_exit(iwch_exit_module);