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