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