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