net/rds/iw.c

   1 /*
   2  * Copyright (c) 2006 Oracle.  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  */
  33 #include <linux/kernel.h>
  34 #include <linux/in.h>
  35 #include <linux/if.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/inetdevice.h>
  38 #include <linux/if_arp.h>
  39 #include <linux/delay.h>
  40
  41 #include "rds.h"
  42 #include "iw.h"
  43
  44 unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE;
  45 unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */
  46
  47 module_param(fastreg_pool_size, int, 0444);
  48 MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device");
  49 module_param(fastreg_message_size, int, 0444);
  50 MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)");
  51
  52 struct list_head rds_iw_devices;
  53
  54 DEFINE_SPINLOCK(iw_nodev_conns_lock);
  55 LIST_HEAD(iw_nodev_conns);
  56
  57 void rds_iw_add_one(struct ib_device *device)
  58 {
  59         struct rds_iw_device *rds_iwdev;
  60         struct ib_device_attr *dev_attr;
  61
  62         /* Only handle iwarp devices */
  63         if (device->node_type != RDMA_NODE_RNIC)
  64                 return;
  65
  66         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
  67         if (!dev_attr)
  68                 return;
  69
  70         if (ib_query_device(device, dev_attr)) {
  71                 rdsdebug("Query device failed for %s\n", device->name);
  72                 goto free_attr;
  73         }
  74
  75         rds_iwdev = kmalloc(sizeof *rds_iwdev, GFP_KERNEL);
  76         if (!rds_iwdev)
  77                 goto free_attr;
  78
  79         spin_lock_init(&rds_iwdev->spinlock);
  80
  81         rds_iwdev->dma_local_lkey = !!(dev_attr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY);
  82         rds_iwdev->max_wrs = dev_attr->max_qp_wr;
  83         rds_iwdev->max_sge = min(dev_attr->max_sge, RDS_IW_MAX_SGE);
  84
  85         rds_iwdev->page_shift = max(PAGE_SHIFT, ffs(dev_attr->page_size_cap) - 1);
  86
  87         rds_iwdev->dev = device;
  88         rds_iwdev->pd = ib_alloc_pd(device);
  89         if (IS_ERR(rds_iwdev->pd))
  90                 goto free_dev;
  91
  92         if (!rds_iwdev->dma_local_lkey) {
  93                 if (device->node_type != RDMA_NODE_RNIC) {
  94                         rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd,
  95                                                 IB_ACCESS_LOCAL_WRITE);
  96                 } else {
  97                         rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd,
  98                                                 IB_ACCESS_REMOTE_READ |
  99                                                 IB_ACCESS_REMOTE_WRITE |
 100                                                 IB_ACCESS_LOCAL_WRITE);
 101                 }
 102                 if (IS_ERR(rds_iwdev->mr))
 103                         goto err_pd;
 104         } else
 105                 rds_iwdev->mr = NULL;
 106
 107         rds_iwdev->mr_pool = rds_iw_create_mr_pool(rds_iwdev);
 108         if (IS_ERR(rds_iwdev->mr_pool)) {
 109                 rds_iwdev->mr_pool = NULL;
 110                 goto err_mr;
 111         }
 112
 113         INIT_LIST_HEAD(&rds_iwdev->cm_id_list);
 114         INIT_LIST_HEAD(&rds_iwdev->conn_list);
 115         list_add_tail(&rds_iwdev->list, &rds_iw_devices);
 116
 117         ib_set_client_data(device, &rds_iw_client, rds_iwdev);
 118
 119         goto free_attr;
 120
 121 err_mr:
 122         if (rds_iwdev->mr)
 123                 ib_dereg_mr(rds_iwdev->mr);
 124 err_pd:
 125         ib_dealloc_pd(rds_iwdev->pd);
 126 free_dev:
 127         kfree(rds_iwdev);
 128 free_attr:
 129         kfree(dev_attr);
 130 }
 131
 132 void rds_iw_remove_one(struct ib_device *device)
 133 {
 134         struct rds_iw_device *rds_iwdev;
 135         struct rds_iw_cm_id *i_cm_id, *next;
 136
 137         rds_iwdev = ib_get_client_data(device, &rds_iw_client);
 138         if (!rds_iwdev)
 139                 return;
 140
 141         spin_lock_irq(&rds_iwdev->spinlock);
 142         list_for_each_entry_safe(i_cm_id, next, &rds_iwdev->cm_id_list, list) {
 143                 list_del(&i_cm_id->list);
 144                 kfree(i_cm_id);
 145         }
 146         spin_unlock_irq(&rds_iwdev->spinlock);
 147
 148         rds_iw_remove_conns(rds_iwdev);
 149
 150         if (rds_iwdev->mr_pool)
 151                 rds_iw_destroy_mr_pool(rds_iwdev->mr_pool);
 152
 153         if (rds_iwdev->mr)
 154                 ib_dereg_mr(rds_iwdev->mr);
 155
 156         while (ib_dealloc_pd(rds_iwdev->pd)) {
 157                 rdsdebug("Failed to dealloc pd %p\n", rds_iwdev->pd);
 158                 msleep(1);
 159         }
 160
 161         list_del(&rds_iwdev->list);
 162         kfree(rds_iwdev);
 163 }
 164
 165 struct ib_client rds_iw_client = {
 166         .name   = "rds_iw",
 167         .add    = rds_iw_add_one,
 168         .remove = rds_iw_remove_one
 169 };
 170
 171 static int rds_iw_conn_info_visitor(struct rds_connection *conn,
 172                                     void *buffer)
 173 {
 174         struct rds_info_rdma_connection *iinfo = buffer;
 175         struct rds_iw_connection *ic;
 176
 177         /* We will only ever look at IB transports */
 178         if (conn->c_trans != &rds_iw_transport)
 179                 return 0;
 180
 181         iinfo->src_addr = conn->c_laddr;
 182         iinfo->dst_addr = conn->c_faddr;
 183
 184         memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
 185         memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
 186         if (rds_conn_state(conn) == RDS_CONN_UP) {
 187                 struct rds_iw_device *rds_iwdev;
 188                 struct rdma_dev_addr *dev_addr;
 189
 190                 ic = conn->c_transport_data;
 191                 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
 192
 193                 ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
 194                 ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
 195
 196                 rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
 197                 iinfo->max_send_wr = ic->i_send_ring.w_nr;
 198                 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
 199                 iinfo->max_send_sge = rds_iwdev->max_sge;
 200                 rds_iw_get_mr_info(rds_iwdev, iinfo);
 201         }
 202         return 1;
 203 }
 204
 205 static void rds_iw_ic_info(struct socket *sock, unsigned int len,
 206                            struct rds_info_iterator *iter,
 207                            struct rds_info_lengths *lens)
 208 {
 209         rds_for_each_conn_info(sock, len, iter, lens,
 210                                 rds_iw_conn_info_visitor,
 211                                 sizeof(struct rds_info_rdma_connection));
 212 }
 213
 214
 215 /*
 216  * Early RDS/IB was built to only bind to an address if there is an IPoIB
 217  * device with that address set.
 218  *
 219  * If it were me, I'd advocate for something more flexible.  Sending and
 220  * receiving should be device-agnostic.  Transports would try and maintain
 221  * connections between peers who have messages queued.  Userspace would be
 222  * allowed to influence which paths have priority.  We could call userspace
 223  * asserting this policy "routing".
 224  */
 225 static int rds_iw_laddr_check(__be32 addr)
 226 {
 227         int ret;
 228         struct rdma_cm_id *cm_id;
 229         struct sockaddr_in sin;
 230
 231         /* Create a CMA ID and try to bind it. This catches both
 232          * IB and iWARP capable NICs.
 233          */
 234         cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP);
 235         if (!cm_id)
 236                 return -EADDRNOTAVAIL;
 237
 238         memset(&sin, 0, sizeof(sin));
 239         sin.sin_family = AF_INET;
 240         sin.sin_addr.s_addr = addr;
 241
 242         /* rdma_bind_addr will only succeed for IB & iWARP devices */
 243         ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
 244         /* due to this, we will claim to support IB devices unless we
 245            check node_type. */
 246         if (ret || cm_id->device->node_type != RDMA_NODE_RNIC)
 247                 ret = -EADDRNOTAVAIL;
 248
 249         rdsdebug("addr %pI4 ret %d node type %d\n",
 250                 &addr, ret,
 251                 cm_id->device ? cm_id->device->node_type : -1);
 252
 253         rdma_destroy_id(cm_id);
 254
 255         return ret;
 256 }
 257
 258 void rds_iw_exit(void)
 259 {
 260         rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
 261         rds_iw_remove_nodev_conns();
 262         ib_unregister_client(&rds_iw_client);
 263         rds_iw_sysctl_exit();
 264         rds_iw_recv_exit();
 265         rds_trans_unregister(&rds_iw_transport);
 266 }
 267
 268 struct rds_transport rds_iw_transport = {
 269         .laddr_check            = rds_iw_laddr_check,
 270         .xmit_complete          = rds_iw_xmit_complete,
 271         .xmit                   = rds_iw_xmit,
 272         .xmit_cong_map          = NULL,
 273         .xmit_rdma              = rds_iw_xmit_rdma,
 274         .recv                   = rds_iw_recv,
 275         .conn_alloc             = rds_iw_conn_alloc,
 276         .conn_free              = rds_iw_conn_free,
 277         .conn_connect           = rds_iw_conn_connect,
 278         .conn_shutdown          = rds_iw_conn_shutdown,
 279         .inc_copy_to_user       = rds_iw_inc_copy_to_user,
 280         .inc_purge              = rds_iw_inc_purge,
 281         .inc_free               = rds_iw_inc_free,
 282         .cm_initiate_connect    = rds_iw_cm_initiate_connect,
 283         .cm_handle_connect      = rds_iw_cm_handle_connect,
 284         .cm_connect_complete    = rds_iw_cm_connect_complete,
 285         .stats_info_copy        = rds_iw_stats_info_copy,
 286         .exit                   = rds_iw_exit,
 287         .get_mr                 = rds_iw_get_mr,
 288         .sync_mr                = rds_iw_sync_mr,
 289         .free_mr                = rds_iw_free_mr,
 290         .flush_mrs              = rds_iw_flush_mrs,
 291         .t_owner                = THIS_MODULE,
 292         .t_name                 = "iwarp",
 293         .t_prefer_loopback      = 1,
 294 };
 295
 296 int __init rds_iw_init(void)
 297 {
 298         int ret;
 299
 300         INIT_LIST_HEAD(&rds_iw_devices);
 301
 302         ret = ib_register_client(&rds_iw_client);
 303         if (ret)
 304                 goto out;
 305
 306         ret = rds_iw_sysctl_init();
 307         if (ret)
 308                 goto out_ibreg;
 309
 310         ret = rds_iw_recv_init();
 311         if (ret)
 312                 goto out_sysctl;
 313
 314         ret = rds_trans_register(&rds_iw_transport);
 315         if (ret)
 316                 goto out_recv;
 317
 318         rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
 319
 320         goto out;
 321
 322 out_recv:
 323         rds_iw_recv_exit();
 324 out_sysctl:
 325         rds_iw_sysctl_exit();
 326 out_ibreg:
 327         ib_unregister_client(&rds_iw_client);
 328 out:
 329         return ret;
 330 }
 331
 332 MODULE_LICENSE("GPL");
 333