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
  41 #include "rds.h"
  42 #include "ib.h"
  43
  44 unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
  45 unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */
  46 unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
  47
  48 module_param(fmr_pool_size, int, 0444);
  49 MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
  50 module_param(fmr_message_size, int, 0444);
  51 MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
  52 module_param(rds_ib_retry_count, int, 0444);
  53 MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
  54
  55 struct list_head rds_ib_devices;
  56
  57 /* NOTE: if also grabbing ibdev lock, grab this first */
  58 DEFINE_SPINLOCK(ib_nodev_conns_lock);
  59 LIST_HEAD(ib_nodev_conns);
  60
  61 void rds_ib_add_one(struct ib_device *device)
  62 {
  63         struct rds_ib_device *rds_ibdev;
  64         struct ib_device_attr *dev_attr;
  65
  66         /* Only handle IB (no iWARP) devices */
  67         if (device->node_type != RDMA_NODE_IB_CA)
  68                 return;
  69
  70         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
  71         if (!dev_attr)
  72                 return;
  73
  74         if (ib_query_device(device, dev_attr)) {
  75                 rdsdebug("Query device failed for %s\n", device->name);
  76                 goto free_attr;
  77         }
  78
  79         rds_ibdev = kmalloc(sizeof *rds_ibdev, GFP_KERNEL);
  80         if (!rds_ibdev)
  81                 goto free_attr;
  82
  83         spin_lock_init(&rds_ibdev->spinlock);
  84
  85         rds_ibdev->max_wrs = dev_attr->max_qp_wr;
  86         rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
  87
  88         rds_ibdev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
  89         rds_ibdev->fmr_page_size  = 1 << rds_ibdev->fmr_page_shift;
  90         rds_ibdev->fmr_page_mask  = ~((u64) rds_ibdev->fmr_page_size - 1);
  91         rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
  92         rds_ibdev->max_fmrs = dev_attr->max_fmr ?
  93                         min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
  94                         fmr_pool_size;
  95
  96         rds_ibdev->dev = device;
  97         rds_ibdev->pd = ib_alloc_pd(device);
  98         if (IS_ERR(rds_ibdev->pd))
  99                 goto free_dev;
 100
 101         rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd,
 102                                       IB_ACCESS_LOCAL_WRITE);
 103         if (IS_ERR(rds_ibdev->mr))
 104                 goto err_pd;
 105
 106         rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev);
 107         if (IS_ERR(rds_ibdev->mr_pool)) {
 108                 rds_ibdev->mr_pool = NULL;
 109                 goto err_mr;
 110         }
 111
 112         INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
 113         INIT_LIST_HEAD(&rds_ibdev->conn_list);
 114         list_add_tail(&rds_ibdev->list, &rds_ib_devices);
 115
 116         ib_set_client_data(device, &rds_ib_client, rds_ibdev);
 117
 118         goto free_attr;
 119
 120 err_mr:
 121         ib_dereg_mr(rds_ibdev->mr);
 122 err_pd:
 123         ib_dealloc_pd(rds_ibdev->pd);
 124 free_dev:
 125         kfree(rds_ibdev);
 126 free_attr:
 127         kfree(dev_attr);
 128 }
 129
 130 void rds_ib_remove_one(struct ib_device *device)
 131 {
 132         struct rds_ib_device *rds_ibdev;
 133         struct rds_ib_ipaddr *i_ipaddr, *i_next;
 134
 135         rds_ibdev = ib_get_client_data(device, &rds_ib_client);
 136         if (!rds_ibdev)
 137                 return;
 138
 139         list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
 140                 list_del(&i_ipaddr->list);
 141                 kfree(i_ipaddr);
 142         }
 143
 144         rds_ib_destroy_conns(rds_ibdev);
 145
 146         if (rds_ibdev->mr_pool)
 147                 rds_ib_destroy_mr_pool(rds_ibdev->mr_pool);
 148
 149         ib_dereg_mr(rds_ibdev->mr);
 150
 151         while (ib_dealloc_pd(rds_ibdev->pd)) {
 152                 rdsdebug("Failed to dealloc pd %p\n", rds_ibdev->pd);
 153                 msleep(1);
 154         }
 155
 156         list_del(&rds_ibdev->list);
 157         kfree(rds_ibdev);
 158 }
 159
 160 struct ib_client rds_ib_client = {
 161         .name   = "rds_ib",
 162         .add    = rds_ib_add_one,
 163         .remove = rds_ib_remove_one
 164 };
 165
 166 static int rds_ib_conn_info_visitor(struct rds_connection *conn,
 167                                     void *buffer)
 168 {
 169         struct rds_info_rdma_connection *iinfo = buffer;
 170         struct rds_ib_connection *ic;
 171
 172         /* We will only ever look at IB transports */
 173         if (conn->c_trans != &rds_ib_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_ib_device *rds_ibdev;
 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                 ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
 189                 ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
 190
 191                 rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_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_ibdev->max_sge;
 195                 rds_ib_get_mr_info(rds_ibdev, iinfo);
 196         }
 197         return 1;
 198 }
 199
 200 static void rds_ib_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_ib_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_ib_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);
 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 iWARP devices unless we
 240            check node_type. */
 241         if (ret || cm_id->device->node_type != RDMA_NODE_IB_CA)
 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_ib_exit(void)
 254 {
 255         rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
 256         rds_ib_destroy_nodev_conns();
 257         ib_unregister_client(&rds_ib_client);
 258         rds_ib_sysctl_exit();
 259         rds_ib_recv_exit();
 260         rds_trans_unregister(&rds_ib_transport);
 261 }
 262
 263 struct rds_transport rds_ib_transport = {
 264         .laddr_check            = rds_ib_laddr_check,
 265         .xmit_complete          = rds_ib_xmit_complete,
 266         .xmit                   = rds_ib_xmit,
 267         .xmit_cong_map          = NULL,
 268         .xmit_rdma              = rds_ib_xmit_rdma,
 269         .recv                   = rds_ib_recv,
 270         .conn_alloc             = rds_ib_conn_alloc,
 271         .conn_free              = rds_ib_conn_free,
 272         .conn_connect           = rds_ib_conn_connect,
 273         .conn_shutdown          = rds_ib_conn_shutdown,
 274         .inc_copy_to_user       = rds_ib_inc_copy_to_user,
 275         .inc_purge              = rds_ib_inc_purge,
 276         .inc_free               = rds_ib_inc_free,
 277         .cm_initiate_connect    = rds_ib_cm_initiate_connect,
 278         .cm_handle_connect      = rds_ib_cm_handle_connect,
 279         .cm_connect_complete    = rds_ib_cm_connect_complete,
 280         .stats_info_copy        = rds_ib_stats_info_copy,
 281         .exit                   = rds_ib_exit,
 282         .get_mr                 = rds_ib_get_mr,
 283         .sync_mr                = rds_ib_sync_mr,
 284         .free_mr                = rds_ib_free_mr,
 285         .flush_mrs              = rds_ib_flush_mrs,
 286         .t_owner                = THIS_MODULE,
 287         .t_name                 = "infiniband",
 288 };
 289
 290 int __init rds_ib_init(void)
 291 {
 292         int ret;
 293
 294         INIT_LIST_HEAD(&rds_ib_devices);
 295
 296         ret = ib_register_client(&rds_ib_client);
 297         if (ret)
 298                 goto out;
 299
 300         ret = rds_ib_sysctl_init();
 301         if (ret)
 302                 goto out_ibreg;
 303
 304         ret = rds_ib_recv_init();
 305         if (ret)
 306                 goto out_sysctl;
 307
 308         ret = rds_trans_register(&rds_ib_transport);
 309         if (ret)
 310                 goto out_recv;
 311
 312         rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
 313
 314         goto out;
 315
 316 out_recv:
 317         rds_ib_recv_exit();
 318 out_sysctl:
 319         rds_ib_sysctl_exit();
 320 out_ibreg:
 321         ib_unregister_client(&rds_ib_client);
 322 out:
 323         return ret;
 324 }
 325
 326 MODULE_LICENSE("GPL");
 327