net/rds/ib.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 "ib.h"
  44
  45 unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
  46 unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */
  47 unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
  48
  49 module_param(fmr_pool_size, int, 0444);
  50 MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
  51 module_param(fmr_message_size, int, 0444);
  52 MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
  53 module_param(rds_ib_retry_count, int, 0444);
  54 MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
  55
  56 struct list_head rds_ib_devices;
  57
  58 /* NOTE: if also grabbing ibdev lock, grab this first */
  59 DEFINE_SPINLOCK(ib_nodev_conns_lock);
  60 LIST_HEAD(ib_nodev_conns);
  61
  62 void rds_ib_add_one(struct ib_device *device)
  63 {
  64         struct rds_ib_device *rds_ibdev;
  65         struct ib_device_attr *dev_attr;
  66
  67         /* Only handle IB (no iWARP) devices */
  68         if (device->node_type != RDMA_NODE_IB_CA)
  69                 return;
  70
  71         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
  72         if (!dev_attr)
  73                 return;
  74
  75         if (ib_query_device(device, dev_attr)) {
  76                 rdsdebug("Query device failed for %s\n", device->name);
  77                 goto free_attr;
  78         }
  79
  80         rds_ibdev = kmalloc(sizeof *rds_ibdev, GFP_KERNEL);
  81         if (!rds_ibdev)
  82                 goto free_attr;
  83
  84         spin_lock_init(&rds_ibdev->spinlock);
  85
  86         rds_ibdev->max_wrs = dev_attr->max_qp_wr;
  87         rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
  88
  89         rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
  90         rds_ibdev->max_fmrs = dev_attr->max_fmr ?
  91                         min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
  92                         fmr_pool_size;
  93
  94         rds_ibdev->max_initiator_depth = dev_attr->max_qp_init_rd_atom;
  95         rds_ibdev->max_responder_resources = dev_attr->max_qp_rd_atom;
  96
  97         rds_ibdev->dev = device;
  98         rds_ibdev->pd = ib_alloc_pd(device);
  99         if (IS_ERR(rds_ibdev->pd))
 100                 goto free_dev;
 101
 102         rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd,
 103                                       IB_ACCESS_LOCAL_WRITE);
 104         if (IS_ERR(rds_ibdev->mr))
 105                 goto err_pd;
 106
 107         rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev);
 108         if (IS_ERR(rds_ibdev->mr_pool)) {
 109                 rds_ibdev->mr_pool = NULL;
 110                 goto err_mr;
 111         }
 112
 113         INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
 114         INIT_LIST_HEAD(&rds_ibdev->conn_list);
 115         list_add_tail(&rds_ibdev->list, &rds_ib_devices);
 116
 117         ib_set_client_data(device, &rds_ib_client, rds_ibdev);
 118
 119         goto free_attr;
 120
 121 err_mr:
 122         ib_dereg_mr(rds_ibdev->mr);
 123 err_pd:
 124         ib_dealloc_pd(rds_ibdev->pd);
 125 free_dev:
 126         kfree(rds_ibdev);
 127 free_attr:
 128         kfree(dev_attr);
 129 }
 130
 131 void rds_ib_remove_one(struct ib_device *device)
 132 {
 133         struct rds_ib_device *rds_ibdev;
 134         struct rds_ib_ipaddr *i_ipaddr, *i_next;
 135
 136         rds_ibdev = ib_get_client_data(device, &rds_ib_client);
 137         if (!rds_ibdev)
 138                 return;
 139
 140         synchronize_rcu();
 141         list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
 142                 list_del(&i_ipaddr->list);
 143                 kfree(i_ipaddr);
 144         }
 145
 146         rds_ib_destroy_conns(rds_ibdev);
 147
 148         if (rds_ibdev->mr_pool)
 149                 rds_ib_destroy_mr_pool(rds_ibdev->mr_pool);
 150
 151         ib_dereg_mr(rds_ibdev->mr);
 152
 153         while (ib_dealloc_pd(rds_ibdev->pd)) {
 154                 rdsdebug("Failed to dealloc pd %p\n", rds_ibdev->pd);
 155                 msleep(1);
 156         }
 157
 158         list_del(&rds_ibdev->list);
 159         kfree(rds_ibdev);
 160 }
 161
 162 struct ib_client rds_ib_client = {
 163         .name   = "rds_ib",
 164         .add    = rds_ib_add_one,
 165         .remove = rds_ib_remove_one
 166 };
 167
 168 static int rds_ib_conn_info_visitor(struct rds_connection *conn,
 169                                     void *buffer)
 170 {
 171         struct rds_info_rdma_connection *iinfo = buffer;
 172         struct rds_ib_connection *ic;
 173
 174         /* We will only ever look at IB transports */
 175         if (conn->c_trans != &rds_ib_transport)
 176                 return 0;
 177
 178         iinfo->src_addr = conn->c_laddr;
 179         iinfo->dst_addr = conn->c_faddr;
 180
 181         memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
 182         memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
 183         if (rds_conn_state(conn) == RDS_CONN_UP) {
 184                 struct rds_ib_device *rds_ibdev;
 185                 struct rdma_dev_addr *dev_addr;
 186
 187                 ic = conn->c_transport_data;
 188                 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
 189
 190                 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
 191                 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
 192
 193                 rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
 194                 iinfo->max_send_wr = ic->i_send_ring.w_nr;
 195                 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
 196                 iinfo->max_send_sge = rds_ibdev->max_sge;
 197                 rds_ib_get_mr_info(rds_ibdev, iinfo);
 198         }
 199         return 1;
 200 }
 201
 202 static void rds_ib_ic_info(struct socket *sock, unsigned int len,
 203                            struct rds_info_iterator *iter,
 204                            struct rds_info_lengths *lens)
 205 {
 206         rds_for_each_conn_info(sock, len, iter, lens,
 207                                 rds_ib_conn_info_visitor,
 208                                 sizeof(struct rds_info_rdma_connection));
 209 }
 210
 211
 212 /*
 213  * Early RDS/IB was built to only bind to an address if there is an IPoIB
 214  * device with that address set.
 215  *
 216  * If it were me, I'd advocate for something more flexible.  Sending and
 217  * receiving should be device-agnostic.  Transports would try and maintain
 218  * connections between peers who have messages queued.  Userspace would be
 219  * allowed to influence which paths have priority.  We could call userspace
 220  * asserting this policy "routing".
 221  */
 222 static int rds_ib_laddr_check(__be32 addr)
 223 {
 224         int ret;
 225         struct rdma_cm_id *cm_id;
 226         struct sockaddr_in sin;
 227
 228         /* Create a CMA ID and try to bind it. This catches both
 229          * IB and iWARP capable NICs.
 230          */
 231         cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP);
 232         if (IS_ERR(cm_id))
 233                 return PTR_ERR(cm_id);
 234
 235         memset(&sin, 0, sizeof(sin));
 236         sin.sin_family = AF_INET;
 237         sin.sin_addr.s_addr = addr;
 238
 239         /* rdma_bind_addr will only succeed for IB & iWARP devices */
 240         ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
 241         /* due to this, we will claim to support iWARP devices unless we
 242            check node_type. */
 243         if (ret || cm_id->device->node_type != RDMA_NODE_IB_CA)
 244                 ret = -EADDRNOTAVAIL;
 245
 246         rdsdebug("addr %pI4 ret %d node type %d\n",
 247                 &addr, ret,
 248                 cm_id->device ? cm_id->device->node_type : -1);
 249
 250         rdma_destroy_id(cm_id);
 251
 252         return ret;
 253 }
 254
 255 void rds_ib_exit(void)
 256 {
 257         rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
 258         rds_ib_destroy_nodev_conns();
 259         ib_unregister_client(&rds_ib_client);
 260         rds_ib_sysctl_exit();
 261         rds_ib_recv_exit();
 262         rds_trans_unregister(&rds_ib_transport);
 263 }
 264
 265 struct rds_transport rds_ib_transport = {
 266         .laddr_check            = rds_ib_laddr_check,
 267         .xmit_complete          = rds_ib_xmit_complete,
 268         .xmit                   = rds_ib_xmit,
 269         .xmit_rdma              = rds_ib_xmit_rdma,
 270         .xmit_atomic            = rds_ib_xmit_atomic,
 271         .recv                   = rds_ib_recv,
 272         .conn_alloc             = rds_ib_conn_alloc,
 273         .conn_free              = rds_ib_conn_free,
 274         .conn_connect           = rds_ib_conn_connect,
 275         .conn_shutdown          = rds_ib_conn_shutdown,
 276         .inc_copy_to_user       = rds_ib_inc_copy_to_user,
 277         .inc_free               = rds_ib_inc_free,
 278         .cm_initiate_connect    = rds_ib_cm_initiate_connect,
 279         .cm_handle_connect      = rds_ib_cm_handle_connect,
 280         .cm_connect_complete    = rds_ib_cm_connect_complete,
 281         .stats_info_copy        = rds_ib_stats_info_copy,
 282         .exit                   = rds_ib_exit,
 283         .get_mr                 = rds_ib_get_mr,
 284         .sync_mr                = rds_ib_sync_mr,
 285         .free_mr                = rds_ib_free_mr,
 286         .flush_mrs              = rds_ib_flush_mrs,
 287         .t_owner                = THIS_MODULE,
 288         .t_name                 = "infiniband",
 289         .t_type                 = RDS_TRANS_IB
 290 };
 291
 292 int __init rds_ib_init(void)
 293 {
 294         int ret;
 295
 296         INIT_LIST_HEAD(&rds_ib_devices);
 297
 298         ret = ib_register_client(&rds_ib_client);
 299         if (ret)
 300                 goto out;
 301
 302         ret = rds_ib_sysctl_init();
 303         if (ret)
 304                 goto out_ibreg;
 305
 306         ret = rds_ib_recv_init();
 307         if (ret)
 308                 goto out_sysctl;
 309
 310         ret = rds_trans_register(&rds_ib_transport);
 311         if (ret)
 312                 goto out_recv;
 313
 314         rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
 315
 316         goto out;
 317
 318 out_recv:
 319         rds_ib_recv_exit();
 320 out_sysctl:
 321         rds_ib_sysctl_exit();
 322 out_ibreg:
 323         ib_unregister_client(&rds_ib_client);
 324 out:
 325         return ret;
 326 }
 327
 328 MODULE_LICENSE("GPL");
 329