Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 35 | #include <linux/slab.h> |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 36 | #include <linux/vmalloc.h> |
Manuel Zerpies | cb0a605 | 2011-06-16 02:09:57 +0000 | [diff] [blame] | 37 | #include <linux/ratelimit.h> |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 38 | |
| 39 | #include "rds.h" |
| 40 | #include "ib.h" |
| 41 | |
| 42 | /* |
| 43 | * Set the selected protocol version |
| 44 | */ |
| 45 | static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version) |
| 46 | { |
| 47 | conn->c_version = version; |
| 48 | } |
| 49 | |
| 50 | /* |
| 51 | * Set up flow control |
| 52 | */ |
| 53 | static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits) |
| 54 | { |
| 55 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 56 | |
| 57 | if (rds_ib_sysctl_flow_control && credits != 0) { |
| 58 | /* We're doing flow control */ |
| 59 | ic->i_flowctl = 1; |
| 60 | rds_ib_send_add_credits(conn, credits); |
| 61 | } else { |
| 62 | ic->i_flowctl = 0; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | /* |
| 67 | * Tune RNR behavior. Without flow control, we use a rather |
| 68 | * low timeout, but not the absolute minimum - this should |
| 69 | * be tunable. |
| 70 | * |
| 71 | * We already set the RNR retry count to 7 (which is the |
| 72 | * smallest infinite number :-) above. |
| 73 | * If flow control is off, we want to change this back to 0 |
| 74 | * so that we learn quickly when our credit accounting is |
| 75 | * buggy. |
| 76 | * |
| 77 | * Caller passes in a qp_attr pointer - don't waste stack spacv |
| 78 | * by allocation this twice. |
| 79 | */ |
| 80 | static void |
| 81 | rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr) |
| 82 | { |
| 83 | int ret; |
| 84 | |
| 85 | attr->min_rnr_timer = IB_RNR_TIMER_000_32; |
| 86 | ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER); |
| 87 | if (ret) |
| 88 | printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret); |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * Connection established. |
| 93 | * We get here for both outgoing and incoming connection. |
| 94 | */ |
| 95 | void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event) |
| 96 | { |
| 97 | const struct rds_ib_connect_private *dp = NULL; |
| 98 | struct rds_ib_connection *ic = conn->c_transport_data; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 99 | struct ib_qp_attr qp_attr; |
| 100 | int err; |
| 101 | |
Andy Grover | 9ddbcfa | 2009-07-17 13:13:23 +0000 | [diff] [blame] | 102 | if (event->param.conn.private_data_len >= sizeof(*dp)) { |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 103 | dp = event->param.conn.private_data; |
| 104 | |
Andy Grover | 02a6a25 | 2009-07-17 13:13:24 +0000 | [diff] [blame] | 105 | /* make sure it isn't empty data */ |
| 106 | if (dp->dp_protocol_major) { |
| 107 | rds_ib_set_protocol(conn, |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 108 | RDS_PROTOCOL(dp->dp_protocol_major, |
Andy Grover | 02a6a25 | 2009-07-17 13:13:24 +0000 | [diff] [blame] | 109 | dp->dp_protocol_minor)); |
| 110 | rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); |
| 111 | } |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 112 | } |
| 113 | |
Andy Grover | f147dd9 | 2010-01-13 15:50:09 -0800 | [diff] [blame] | 114 | if (conn->c_version < RDS_PROTOCOL(3,1)) { |
| 115 | printk(KERN_NOTICE "RDS/IB: Connection to %pI4 version %u.%u failed," |
| 116 | " no longer supported\n", |
| 117 | &conn->c_faddr, |
| 118 | RDS_PROTOCOL_MAJOR(conn->c_version), |
| 119 | RDS_PROTOCOL_MINOR(conn->c_version)); |
| 120 | rds_conn_destroy(conn); |
| 121 | return; |
| 122 | } else { |
| 123 | printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n", |
| 124 | &conn->c_faddr, |
| 125 | RDS_PROTOCOL_MAJOR(conn->c_version), |
| 126 | RDS_PROTOCOL_MINOR(conn->c_version), |
| 127 | ic->i_flowctl ? ", flow control" : ""); |
| 128 | } |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 129 | |
Andy Grover | e11d912 | 2009-07-17 13:13:29 +0000 | [diff] [blame] | 130 | /* |
| 131 | * Init rings and fill recv. this needs to wait until protocol negotiation |
| 132 | * is complete, since ring layout is different from 3.0 to 3.1. |
| 133 | */ |
| 134 | rds_ib_send_init_ring(ic); |
| 135 | rds_ib_recv_init_ring(ic); |
| 136 | /* Post receive buffers - as a side effect, this will update |
| 137 | * the posted credit count. */ |
santosh.shilimkar@oracle.com | 73ce431 | 2015-08-22 15:45:26 -0700 | [diff] [blame] | 138 | rds_ib_recv_refill(conn, 1, GFP_KERNEL); |
Andy Grover | e11d912 | 2009-07-17 13:13:29 +0000 | [diff] [blame] | 139 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 140 | /* Tune RNR behavior */ |
| 141 | rds_ib_tune_rnr(ic, &qp_attr); |
| 142 | |
| 143 | qp_attr.qp_state = IB_QPS_RTS; |
| 144 | err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE); |
| 145 | if (err) |
| 146 | printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err); |
| 147 | |
Zach Brown | 3e0249f | 2010-05-18 15:48:51 -0700 | [diff] [blame] | 148 | /* update ib_device with this local ipaddr */ |
| 149 | err = rds_ib_update_ipaddr(ic->rds_ibdev, conn->c_laddr); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 150 | if (err) |
Zach Brown | 3e0249f | 2010-05-18 15:48:51 -0700 | [diff] [blame] | 151 | printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n", |
| 152 | err); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 153 | |
| 154 | /* If the peer gave us the last packet it saw, process this as if |
| 155 | * we had received a regular ACK. */ |
shamir rabinovitch | c0adf54 | 2015-04-30 20:58:07 -0400 | [diff] [blame] | 156 | if (dp) { |
| 157 | /* dp structure start is not guaranteed to be 8 bytes aligned. |
| 158 | * Since dp_ack_seq is 64-bit extended load operations can be |
| 159 | * used so go through get_unaligned to avoid unaligned errors. |
| 160 | */ |
David Ahern | e278371 | 2015-05-04 11:51:38 -0400 | [diff] [blame] | 161 | __be64 dp_ack_seq = get_unaligned(&dp->dp_ack_seq); |
shamir rabinovitch | c0adf54 | 2015-04-30 20:58:07 -0400 | [diff] [blame] | 162 | |
| 163 | if (dp_ack_seq) |
| 164 | rds_send_drop_acked(conn, be64_to_cpu(dp_ack_seq), |
| 165 | NULL); |
| 166 | } |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 167 | |
| 168 | rds_connect_complete(conn); |
| 169 | } |
| 170 | |
| 171 | static void rds_ib_cm_fill_conn_param(struct rds_connection *conn, |
| 172 | struct rdma_conn_param *conn_param, |
| 173 | struct rds_ib_connect_private *dp, |
Andy Grover | 40589e7 | 2010-01-12 10:50:48 -0800 | [diff] [blame] | 174 | u32 protocol_version, |
| 175 | u32 max_responder_resources, |
| 176 | u32 max_initiator_depth) |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 177 | { |
Andy Grover | 40589e7 | 2010-01-12 10:50:48 -0800 | [diff] [blame] | 178 | struct rds_ib_connection *ic = conn->c_transport_data; |
Zach Brown | 3e0249f | 2010-05-18 15:48:51 -0700 | [diff] [blame] | 179 | struct rds_ib_device *rds_ibdev = ic->rds_ibdev; |
Andy Grover | 40589e7 | 2010-01-12 10:50:48 -0800 | [diff] [blame] | 180 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 181 | memset(conn_param, 0, sizeof(struct rdma_conn_param)); |
Andy Grover | 40589e7 | 2010-01-12 10:50:48 -0800 | [diff] [blame] | 182 | |
Andy Grover | 40589e7 | 2010-01-12 10:50:48 -0800 | [diff] [blame] | 183 | conn_param->responder_resources = |
| 184 | min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources); |
| 185 | conn_param->initiator_depth = |
| 186 | min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth); |
Andy Grover | 3ba23ad | 2009-07-17 13:13:22 +0000 | [diff] [blame] | 187 | conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 188 | conn_param->rnr_retry_count = 7; |
| 189 | |
| 190 | if (dp) { |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 191 | memset(dp, 0, sizeof(*dp)); |
| 192 | dp->dp_saddr = conn->c_laddr; |
| 193 | dp->dp_daddr = conn->c_faddr; |
| 194 | dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version); |
| 195 | dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version); |
| 196 | dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS); |
| 197 | dp->dp_ack_seq = rds_ib_piggyb_ack(ic); |
| 198 | |
| 199 | /* Advertise flow control */ |
| 200 | if (ic->i_flowctl) { |
| 201 | unsigned int credits; |
| 202 | |
| 203 | credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits)); |
| 204 | dp->dp_credit = cpu_to_be32(credits); |
| 205 | atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits); |
| 206 | } |
| 207 | |
| 208 | conn_param->private_data = dp; |
| 209 | conn_param->private_data_len = sizeof(*dp); |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | static void rds_ib_cq_event_handler(struct ib_event *event, void *data) |
| 214 | { |
Zach Brown | 1bde04a | 2010-07-14 14:01:21 -0700 | [diff] [blame] | 215 | rdsdebug("event %u (%s) data %p\n", |
Sagi Grimberg | 3c88f3d | 2015-05-18 13:40:33 +0300 | [diff] [blame] | 216 | event->event, ib_event_msg(event->event), data); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 217 | } |
| 218 | |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 219 | /* Plucking the oldest entry from the ring can be done concurrently with |
| 220 | * the thread refilling the ring. Each ring operation is protected by |
| 221 | * spinlocks and the transient state of refilling doesn't change the |
| 222 | * recording of which entry is oldest. |
| 223 | * |
| 224 | * This relies on IB only calling one cq comp_handler for each cq so that |
| 225 | * there will only be one caller of rds_recv_incoming() per RDS connection. |
| 226 | */ |
| 227 | static void rds_ib_cq_comp_handler_recv(struct ib_cq *cq, void *context) |
| 228 | { |
| 229 | struct rds_connection *conn = context; |
| 230 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 231 | |
| 232 | rdsdebug("conn %p cq %p\n", conn, cq); |
| 233 | |
| 234 | rds_ib_stats_inc(s_ib_evt_handler_call); |
| 235 | |
| 236 | tasklet_schedule(&ic->i_recv_tasklet); |
| 237 | } |
| 238 | |
| 239 | static void poll_cq(struct rds_ib_connection *ic, struct ib_cq *cq, |
| 240 | struct ib_wc *wcs, |
| 241 | struct rds_ib_ack_state *ack_state) |
| 242 | { |
| 243 | int nr; |
| 244 | int i; |
| 245 | struct ib_wc *wc; |
| 246 | |
| 247 | while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) { |
| 248 | for (i = 0; i < nr; i++) { |
| 249 | wc = wcs + i; |
| 250 | rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n", |
| 251 | (unsigned long long)wc->wr_id, wc->status, |
| 252 | wc->byte_len, be32_to_cpu(wc->ex.imm_data)); |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 253 | |
| 254 | if (wc->wr_id & RDS_IB_SEND_OP) |
| 255 | rds_ib_send_cqe_handler(ic, wc); |
| 256 | else |
| 257 | rds_ib_recv_cqe_handler(ic, wc, ack_state); |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 258 | } |
| 259 | } |
| 260 | } |
| 261 | |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 262 | static void rds_ib_tasklet_fn_send(unsigned long data) |
| 263 | { |
| 264 | struct rds_ib_connection *ic = (struct rds_ib_connection *)data; |
| 265 | struct rds_connection *conn = ic->conn; |
| 266 | struct rds_ib_ack_state state; |
| 267 | |
| 268 | rds_ib_stats_inc(s_ib_tasklet_call); |
| 269 | |
| 270 | memset(&state, 0, sizeof(state)); |
| 271 | poll_cq(ic, ic->i_send_cq, ic->i_send_wc, &state); |
| 272 | ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP); |
| 273 | poll_cq(ic, ic->i_send_cq, ic->i_send_wc, &state); |
| 274 | |
| 275 | if (rds_conn_up(conn) && |
| 276 | (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags) || |
| 277 | test_bit(0, &conn->c_map_queued))) |
| 278 | rds_send_xmit(ic->conn); |
| 279 | } |
| 280 | |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 281 | static void rds_ib_tasklet_fn_recv(unsigned long data) |
| 282 | { |
| 283 | struct rds_ib_connection *ic = (struct rds_ib_connection *)data; |
| 284 | struct rds_connection *conn = ic->conn; |
| 285 | struct rds_ib_device *rds_ibdev = ic->rds_ibdev; |
| 286 | struct rds_ib_ack_state state; |
| 287 | |
Santosh Shilimkar | 9441c97 | 2015-09-19 14:01:09 -0400 | [diff] [blame] | 288 | if (!rds_ibdev) |
| 289 | rds_conn_drop(conn); |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 290 | |
| 291 | rds_ib_stats_inc(s_ib_tasklet_call); |
| 292 | |
| 293 | memset(&state, 0, sizeof(state)); |
| 294 | poll_cq(ic, ic->i_recv_cq, ic->i_recv_wc, &state); |
| 295 | ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); |
| 296 | poll_cq(ic, ic->i_recv_cq, ic->i_recv_wc, &state); |
| 297 | |
| 298 | if (state.ack_next_valid) |
| 299 | rds_ib_set_ack(ic, state.ack_next, state.ack_required); |
| 300 | if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) { |
| 301 | rds_send_drop_acked(conn, state.ack_recv, NULL); |
| 302 | ic->i_ack_recv = state.ack_recv; |
| 303 | } |
| 304 | |
| 305 | if (rds_conn_up(conn)) |
| 306 | rds_ib_attempt_ack(ic); |
| 307 | } |
| 308 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 309 | static void rds_ib_qp_event_handler(struct ib_event *event, void *data) |
| 310 | { |
| 311 | struct rds_connection *conn = data; |
| 312 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 313 | |
Zach Brown | 1bde04a | 2010-07-14 14:01:21 -0700 | [diff] [blame] | 314 | rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event, |
Sagi Grimberg | 3c88f3d | 2015-05-18 13:40:33 +0300 | [diff] [blame] | 315 | ib_event_msg(event->event)); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 316 | |
| 317 | switch (event->event) { |
| 318 | case IB_EVENT_COMM_EST: |
| 319 | rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST); |
| 320 | break; |
| 321 | default: |
Zach Brown | 1bde04a | 2010-07-14 14:01:21 -0700 | [diff] [blame] | 322 | rdsdebug("Fatal QP Event %u (%s) " |
Andy Grover | fdf6e6b | 2009-07-17 13:13:31 +0000 | [diff] [blame] | 323 | "- connection %pI4->%pI4, reconnecting\n", |
Sagi Grimberg | 3c88f3d | 2015-05-18 13:40:33 +0300 | [diff] [blame] | 324 | event->event, ib_event_msg(event->event), |
Zach Brown | 1bde04a | 2010-07-14 14:01:21 -0700 | [diff] [blame] | 325 | &conn->c_laddr, &conn->c_faddr); |
Andy Grover | 9706978 | 2010-03-11 13:50:02 +0000 | [diff] [blame] | 326 | rds_conn_drop(conn); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 327 | break; |
| 328 | } |
| 329 | } |
| 330 | |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 331 | static void rds_ib_cq_comp_handler_send(struct ib_cq *cq, void *context) |
| 332 | { |
| 333 | struct rds_connection *conn = context; |
| 334 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 335 | |
| 336 | rdsdebug("conn %p cq %p\n", conn, cq); |
| 337 | |
| 338 | rds_ib_stats_inc(s_ib_evt_handler_call); |
| 339 | |
| 340 | tasklet_schedule(&ic->i_send_tasklet); |
| 341 | } |
| 342 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 343 | /* |
| 344 | * This needs to be very careful to not leave IS_ERR pointers around for |
| 345 | * cleanup to trip over. |
| 346 | */ |
| 347 | static int rds_ib_setup_qp(struct rds_connection *conn) |
| 348 | { |
| 349 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 350 | struct ib_device *dev = ic->i_cm_id->device; |
| 351 | struct ib_qp_init_attr attr; |
Matan Barak | 8e37210 | 2015-06-11 16:35:21 +0300 | [diff] [blame] | 352 | struct ib_cq_init_attr cq_attr = {}; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 353 | struct rds_ib_device *rds_ibdev; |
| 354 | int ret; |
| 355 | |
Zach Brown | 3e0249f | 2010-05-18 15:48:51 -0700 | [diff] [blame] | 356 | /* |
| 357 | * It's normal to see a null device if an incoming connection races |
| 358 | * with device removal, so we don't print a warning. |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 359 | */ |
Zach Brown | 3e0249f | 2010-05-18 15:48:51 -0700 | [diff] [blame] | 360 | rds_ibdev = rds_ib_get_client_data(dev); |
| 361 | if (!rds_ibdev) |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 362 | return -EOPNOTSUPP; |
Zach Brown | 3e0249f | 2010-05-18 15:48:51 -0700 | [diff] [blame] | 363 | |
| 364 | /* add the conn now so that connection establishment has the dev */ |
| 365 | rds_ib_add_conn(rds_ibdev, conn); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 366 | |
| 367 | if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1) |
| 368 | rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1); |
| 369 | if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1) |
| 370 | rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1); |
| 371 | |
| 372 | /* Protection domain and memory range */ |
| 373 | ic->i_pd = rds_ibdev->pd; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 374 | |
Matan Barak | 8e37210 | 2015-06-11 16:35:21 +0300 | [diff] [blame] | 375 | cq_attr.cqe = ic->i_send_ring.w_nr + 1; |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 376 | |
| 377 | ic->i_send_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_send, |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 378 | rds_ib_cq_event_handler, conn, |
Matan Barak | 8e37210 | 2015-06-11 16:35:21 +0300 | [diff] [blame] | 379 | &cq_attr); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 380 | if (IS_ERR(ic->i_send_cq)) { |
| 381 | ret = PTR_ERR(ic->i_send_cq); |
| 382 | ic->i_send_cq = NULL; |
| 383 | rdsdebug("ib_create_cq send failed: %d\n", ret); |
| 384 | goto out; |
| 385 | } |
| 386 | |
Matan Barak | 8e37210 | 2015-06-11 16:35:21 +0300 | [diff] [blame] | 387 | cq_attr.cqe = ic->i_recv_ring.w_nr; |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 388 | ic->i_recv_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_recv, |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 389 | rds_ib_cq_event_handler, conn, |
Matan Barak | 8e37210 | 2015-06-11 16:35:21 +0300 | [diff] [blame] | 390 | &cq_attr); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 391 | if (IS_ERR(ic->i_recv_cq)) { |
| 392 | ret = PTR_ERR(ic->i_recv_cq); |
| 393 | ic->i_recv_cq = NULL; |
| 394 | rdsdebug("ib_create_cq recv failed: %d\n", ret); |
| 395 | goto out; |
| 396 | } |
| 397 | |
| 398 | ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP); |
| 399 | if (ret) { |
| 400 | rdsdebug("ib_req_notify_cq send failed: %d\n", ret); |
| 401 | goto out; |
| 402 | } |
| 403 | |
| 404 | ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); |
| 405 | if (ret) { |
| 406 | rdsdebug("ib_req_notify_cq recv failed: %d\n", ret); |
| 407 | goto out; |
| 408 | } |
| 409 | |
| 410 | /* XXX negotiate max send/recv with remote? */ |
| 411 | memset(&attr, 0, sizeof(attr)); |
| 412 | attr.event_handler = rds_ib_qp_event_handler; |
| 413 | attr.qp_context = conn; |
| 414 | /* + 1 to allow for the single ack message */ |
| 415 | attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1; |
| 416 | attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1; |
| 417 | attr.cap.max_send_sge = rds_ibdev->max_sge; |
| 418 | attr.cap.max_recv_sge = RDS_IB_RECV_SGE; |
| 419 | attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
| 420 | attr.qp_type = IB_QPT_RC; |
| 421 | attr.send_cq = ic->i_send_cq; |
| 422 | attr.recv_cq = ic->i_recv_cq; |
| 423 | |
| 424 | /* |
| 425 | * XXX this can fail if max_*_wr is too large? Are we supposed |
| 426 | * to back off until we get a value that the hardware can support? |
| 427 | */ |
| 428 | ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr); |
| 429 | if (ret) { |
| 430 | rdsdebug("rdma_create_qp failed: %d\n", ret); |
| 431 | goto out; |
| 432 | } |
| 433 | |
| 434 | ic->i_send_hdrs = ib_dma_alloc_coherent(dev, |
| 435 | ic->i_send_ring.w_nr * |
| 436 | sizeof(struct rds_header), |
| 437 | &ic->i_send_hdrs_dma, GFP_KERNEL); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 438 | if (!ic->i_send_hdrs) { |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 439 | ret = -ENOMEM; |
| 440 | rdsdebug("ib_dma_alloc_coherent send failed\n"); |
| 441 | goto out; |
| 442 | } |
| 443 | |
| 444 | ic->i_recv_hdrs = ib_dma_alloc_coherent(dev, |
| 445 | ic->i_recv_ring.w_nr * |
| 446 | sizeof(struct rds_header), |
| 447 | &ic->i_recv_hdrs_dma, GFP_KERNEL); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 448 | if (!ic->i_recv_hdrs) { |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 449 | ret = -ENOMEM; |
| 450 | rdsdebug("ib_dma_alloc_coherent recv failed\n"); |
| 451 | goto out; |
| 452 | } |
| 453 | |
| 454 | ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header), |
| 455 | &ic->i_ack_dma, GFP_KERNEL); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 456 | if (!ic->i_ack) { |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 457 | ret = -ENOMEM; |
| 458 | rdsdebug("ib_dma_alloc_coherent ack failed\n"); |
| 459 | goto out; |
| 460 | } |
| 461 | |
Joe Perches | 3dbd443 | 2011-05-28 10:36:35 -0700 | [diff] [blame] | 462 | ic->i_sends = vzalloc_node(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work), |
Andy Grover | e4c52c9 | 2010-04-23 10:49:53 -0700 | [diff] [blame] | 463 | ibdev_to_node(dev)); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 464 | if (!ic->i_sends) { |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 465 | ret = -ENOMEM; |
| 466 | rdsdebug("send allocation failed\n"); |
| 467 | goto out; |
| 468 | } |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 469 | |
Joe Perches | 3dbd443 | 2011-05-28 10:36:35 -0700 | [diff] [blame] | 470 | ic->i_recvs = vzalloc_node(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work), |
Andy Grover | e4c52c9 | 2010-04-23 10:49:53 -0700 | [diff] [blame] | 471 | ibdev_to_node(dev)); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 472 | if (!ic->i_recvs) { |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 473 | ret = -ENOMEM; |
| 474 | rdsdebug("recv allocation failed\n"); |
| 475 | goto out; |
| 476 | } |
| 477 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 478 | rds_ib_recv_init_ack(ic); |
| 479 | |
Jason Gunthorpe | e558024 | 2015-07-30 17:22:26 -0600 | [diff] [blame] | 480 | rdsdebug("conn %p pd %p cq %p %p\n", conn, ic->i_pd, |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 481 | ic->i_send_cq, ic->i_recv_cq); |
| 482 | |
| 483 | out: |
Zach Brown | 3e0249f | 2010-05-18 15:48:51 -0700 | [diff] [blame] | 484 | rds_ib_dev_put(rds_ibdev); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 485 | return ret; |
| 486 | } |
| 487 | |
Andy Grover | 9ddbcfa | 2009-07-17 13:13:23 +0000 | [diff] [blame] | 488 | static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event) |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 489 | { |
Andy Grover | 9ddbcfa | 2009-07-17 13:13:23 +0000 | [diff] [blame] | 490 | const struct rds_ib_connect_private *dp = event->param.conn.private_data; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 491 | u16 common; |
| 492 | u32 version = 0; |
| 493 | |
Andy Grover | 9ddbcfa | 2009-07-17 13:13:23 +0000 | [diff] [blame] | 494 | /* |
| 495 | * rdma_cm private data is odd - when there is any private data in the |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 496 | * request, we will be given a pretty large buffer without telling us the |
| 497 | * original size. The only way to tell the difference is by looking at |
| 498 | * the contents, which are initialized to zero. |
| 499 | * If the protocol version fields aren't set, this is a connection attempt |
| 500 | * from an older version. This could could be 3.0 or 2.0 - we can't tell. |
Andy Grover | 9ddbcfa | 2009-07-17 13:13:23 +0000 | [diff] [blame] | 501 | * We really should have changed this for OFED 1.3 :-( |
| 502 | */ |
| 503 | |
| 504 | /* Be paranoid. RDS always has privdata */ |
| 505 | if (!event->param.conn.private_data_len) { |
| 506 | printk(KERN_NOTICE "RDS incoming connection has no private data, " |
| 507 | "rejecting\n"); |
| 508 | return 0; |
| 509 | } |
| 510 | |
| 511 | /* Even if len is crap *now* I still want to check it. -ASG */ |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 512 | if (event->param.conn.private_data_len < sizeof (*dp) || |
| 513 | dp->dp_protocol_major == 0) |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 514 | return RDS_PROTOCOL_3_0; |
| 515 | |
| 516 | common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS; |
| 517 | if (dp->dp_protocol_major == 3 && common) { |
| 518 | version = RDS_PROTOCOL_3_0; |
| 519 | while ((common >>= 1) != 0) |
| 520 | version++; |
Marciniszyn, Mike | a496759 | 2012-12-21 08:01:54 +0000 | [diff] [blame] | 521 | } else |
| 522 | printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using incompatible protocol version %u.%u\n", |
| 523 | &dp->dp_saddr, |
| 524 | dp->dp_protocol_major, |
| 525 | dp->dp_protocol_minor); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 526 | return version; |
| 527 | } |
| 528 | |
| 529 | int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, |
| 530 | struct rdma_cm_event *event) |
| 531 | { |
| 532 | __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id; |
| 533 | __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id; |
| 534 | const struct rds_ib_connect_private *dp = event->param.conn.private_data; |
| 535 | struct rds_ib_connect_private dp_rep; |
| 536 | struct rds_connection *conn = NULL; |
| 537 | struct rds_ib_connection *ic = NULL; |
| 538 | struct rdma_conn_param conn_param; |
| 539 | u32 version; |
Zach Brown | a46ca94 | 2010-05-24 13:14:59 -0700 | [diff] [blame] | 540 | int err = 1, destroy = 1; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 541 | |
| 542 | /* Check whether the remote protocol version matches ours. */ |
Andy Grover | 9ddbcfa | 2009-07-17 13:13:23 +0000 | [diff] [blame] | 543 | version = rds_ib_protocol_compatible(event); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 544 | if (!version) |
| 545 | goto out; |
| 546 | |
| 547 | rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid " |
| 548 | "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr, |
| 549 | RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version), |
| 550 | (unsigned long long)be64_to_cpu(lguid), |
| 551 | (unsigned long long)be64_to_cpu(fguid)); |
| 552 | |
Sowmini Varadhan | d5a8ac2 | 2015-08-05 01:43:25 -0400 | [diff] [blame] | 553 | /* RDS/IB is not currently netns aware, thus init_net */ |
| 554 | conn = rds_conn_create(&init_net, dp->dp_daddr, dp->dp_saddr, |
| 555 | &rds_ib_transport, GFP_KERNEL); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 556 | if (IS_ERR(conn)) { |
| 557 | rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn)); |
| 558 | conn = NULL; |
| 559 | goto out; |
| 560 | } |
| 561 | |
| 562 | /* |
| 563 | * The connection request may occur while the |
| 564 | * previous connection exist, e.g. in case of failover. |
| 565 | * But as connections may be initiated simultaneously |
| 566 | * by both hosts, we have a random backoff mechanism - |
| 567 | * see the comment above rds_queue_reconnect() |
| 568 | */ |
| 569 | mutex_lock(&conn->c_cm_lock); |
| 570 | if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) { |
| 571 | if (rds_conn_state(conn) == RDS_CONN_UP) { |
| 572 | rdsdebug("incoming connect while connecting\n"); |
| 573 | rds_conn_drop(conn); |
| 574 | rds_ib_stats_inc(s_ib_listen_closed_stale); |
| 575 | } else |
| 576 | if (rds_conn_state(conn) == RDS_CONN_CONNECTING) { |
| 577 | /* Wait and see - our connect may still be succeeding */ |
| 578 | rds_ib_stats_inc(s_ib_connect_raced); |
| 579 | } |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 580 | goto out; |
| 581 | } |
| 582 | |
| 583 | ic = conn->c_transport_data; |
| 584 | |
| 585 | rds_ib_set_protocol(conn, version); |
| 586 | rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); |
| 587 | |
| 588 | /* If the peer gave us the last packet it saw, process this as if |
| 589 | * we had received a regular ACK. */ |
| 590 | if (dp->dp_ack_seq) |
| 591 | rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL); |
| 592 | |
| 593 | BUG_ON(cm_id->context); |
| 594 | BUG_ON(ic->i_cm_id); |
| 595 | |
| 596 | ic->i_cm_id = cm_id; |
| 597 | cm_id->context = conn; |
| 598 | |
| 599 | /* We got halfway through setting up the ib_connection, if we |
| 600 | * fail now, we have to take the long route out of this mess. */ |
| 601 | destroy = 0; |
| 602 | |
| 603 | err = rds_ib_setup_qp(conn); |
| 604 | if (err) { |
| 605 | rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err); |
| 606 | goto out; |
| 607 | } |
| 608 | |
Andy Grover | 40589e7 | 2010-01-12 10:50:48 -0800 | [diff] [blame] | 609 | rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version, |
| 610 | event->param.conn.responder_resources, |
| 611 | event->param.conn.initiator_depth); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 612 | |
| 613 | /* rdma_accept() calls rdma_reject() internally if it fails */ |
| 614 | err = rdma_accept(cm_id, &conn_param); |
Zach Brown | a46ca94 | 2010-05-24 13:14:59 -0700 | [diff] [blame] | 615 | if (err) |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 616 | rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 617 | |
| 618 | out: |
Zach Brown | a46ca94 | 2010-05-24 13:14:59 -0700 | [diff] [blame] | 619 | if (conn) |
| 620 | mutex_unlock(&conn->c_cm_lock); |
| 621 | if (err) |
| 622 | rdma_reject(cm_id, NULL, 0); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 623 | return destroy; |
| 624 | } |
| 625 | |
| 626 | |
| 627 | int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id) |
| 628 | { |
| 629 | struct rds_connection *conn = cm_id->context; |
| 630 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 631 | struct rdma_conn_param conn_param; |
| 632 | struct rds_ib_connect_private dp; |
| 633 | int ret; |
| 634 | |
| 635 | /* If the peer doesn't do protocol negotiation, we must |
| 636 | * default to RDSv3.0 */ |
| 637 | rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0); |
| 638 | ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */ |
| 639 | |
| 640 | ret = rds_ib_setup_qp(conn); |
| 641 | if (ret) { |
| 642 | rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret); |
| 643 | goto out; |
| 644 | } |
| 645 | |
Andy Grover | 40589e7 | 2010-01-12 10:50:48 -0800 | [diff] [blame] | 646 | rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION, |
| 647 | UINT_MAX, UINT_MAX); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 648 | ret = rdma_connect(cm_id, &conn_param); |
| 649 | if (ret) |
| 650 | rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret); |
| 651 | |
| 652 | out: |
| 653 | /* Beware - returning non-zero tells the rdma_cm to destroy |
| 654 | * the cm_id. We should certainly not do it as long as we still |
| 655 | * "own" the cm_id. */ |
| 656 | if (ret) { |
| 657 | if (ic->i_cm_id == cm_id) |
| 658 | ret = 0; |
| 659 | } |
| 660 | return ret; |
| 661 | } |
| 662 | |
| 663 | int rds_ib_conn_connect(struct rds_connection *conn) |
| 664 | { |
| 665 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 666 | struct sockaddr_in src, dest; |
| 667 | int ret; |
| 668 | |
| 669 | /* XXX I wonder what affect the port space has */ |
| 670 | /* delegate cm event handler to rdma_transport */ |
Guy Shapiro | fa20105 | 2015-10-22 15:20:10 +0300 | [diff] [blame] | 671 | ic->i_cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler, conn, |
Sean Hefty | b26f9b9 | 2010-04-01 17:08:41 +0000 | [diff] [blame] | 672 | RDMA_PS_TCP, IB_QPT_RC); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 673 | if (IS_ERR(ic->i_cm_id)) { |
| 674 | ret = PTR_ERR(ic->i_cm_id); |
| 675 | ic->i_cm_id = NULL; |
| 676 | rdsdebug("rdma_create_id() failed: %d\n", ret); |
| 677 | goto out; |
| 678 | } |
| 679 | |
| 680 | rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn); |
| 681 | |
| 682 | src.sin_family = AF_INET; |
| 683 | src.sin_addr.s_addr = (__force u32)conn->c_laddr; |
| 684 | src.sin_port = (__force u16)htons(0); |
| 685 | |
| 686 | dest.sin_family = AF_INET; |
| 687 | dest.sin_addr.s_addr = (__force u32)conn->c_faddr; |
| 688 | dest.sin_port = (__force u16)htons(RDS_PORT); |
| 689 | |
| 690 | ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src, |
| 691 | (struct sockaddr *)&dest, |
| 692 | RDS_RDMA_RESOLVE_TIMEOUT_MS); |
| 693 | if (ret) { |
| 694 | rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id, |
| 695 | ret); |
| 696 | rdma_destroy_id(ic->i_cm_id); |
| 697 | ic->i_cm_id = NULL; |
| 698 | } |
| 699 | |
| 700 | out: |
| 701 | return ret; |
| 702 | } |
| 703 | |
| 704 | /* |
| 705 | * This is so careful about only cleaning up resources that were built up |
| 706 | * so that it can be called at any point during startup. In fact it |
| 707 | * can be called multiple times for a given connection. |
| 708 | */ |
| 709 | void rds_ib_conn_shutdown(struct rds_connection *conn) |
| 710 | { |
| 711 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 712 | int err = 0; |
| 713 | |
| 714 | rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id, |
| 715 | ic->i_pd, ic->i_send_cq, ic->i_recv_cq, |
| 716 | ic->i_cm_id ? ic->i_cm_id->qp : NULL); |
| 717 | |
| 718 | if (ic->i_cm_id) { |
| 719 | struct ib_device *dev = ic->i_cm_id->device; |
| 720 | |
| 721 | rdsdebug("disconnecting cm %p\n", ic->i_cm_id); |
| 722 | err = rdma_disconnect(ic->i_cm_id); |
| 723 | if (err) { |
| 724 | /* Actually this may happen quite frequently, when |
| 725 | * an outgoing connect raced with an incoming connect. |
| 726 | */ |
| 727 | rdsdebug("failed to disconnect, cm: %p err %d\n", |
| 728 | ic->i_cm_id, err); |
| 729 | } |
| 730 | |
Andy Grover | e32b4a7 | 2010-03-03 19:25:21 -0800 | [diff] [blame] | 731 | /* |
Zach Brown | f046011 | 2010-07-14 13:55:35 -0700 | [diff] [blame] | 732 | * We want to wait for tx and rx completion to finish |
| 733 | * before we tear down the connection, but we have to be |
| 734 | * careful not to get stuck waiting on a send ring that |
| 735 | * only has unsignaled sends in it. We've shutdown new |
| 736 | * sends before getting here so by waiting for signaled |
| 737 | * sends to complete we're ensured that there will be no |
| 738 | * more tx processing. |
Andy Grover | e32b4a7 | 2010-03-03 19:25:21 -0800 | [diff] [blame] | 739 | */ |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 740 | wait_event(rds_ib_ring_empty_wait, |
Zach Brown | f046011 | 2010-07-14 13:55:35 -0700 | [diff] [blame] | 741 | rds_ib_ring_empty(&ic->i_recv_ring) && |
| 742 | (atomic_read(&ic->i_signaled_sends) == 0)); |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 743 | tasklet_kill(&ic->i_send_tasklet); |
Zach Brown | f046011 | 2010-07-14 13:55:35 -0700 | [diff] [blame] | 744 | tasklet_kill(&ic->i_recv_tasklet); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 745 | |
santosh.shilimkar@oracle.com | 1bc7b863 | 2015-08-22 15:45:24 -0700 | [diff] [blame] | 746 | /* first destroy the ib state that generates callbacks */ |
| 747 | if (ic->i_cm_id->qp) |
| 748 | rdma_destroy_qp(ic->i_cm_id); |
| 749 | if (ic->i_send_cq) |
| 750 | ib_destroy_cq(ic->i_send_cq); |
| 751 | if (ic->i_recv_cq) |
| 752 | ib_destroy_cq(ic->i_recv_cq); |
santosh.shilimkar@oracle.com | 1bc7b863 | 2015-08-22 15:45:24 -0700 | [diff] [blame] | 753 | |
| 754 | /* then free the resources that ib callbacks use */ |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 755 | if (ic->i_send_hdrs) |
| 756 | ib_dma_free_coherent(dev, |
| 757 | ic->i_send_ring.w_nr * |
| 758 | sizeof(struct rds_header), |
| 759 | ic->i_send_hdrs, |
| 760 | ic->i_send_hdrs_dma); |
| 761 | |
| 762 | if (ic->i_recv_hdrs) |
| 763 | ib_dma_free_coherent(dev, |
| 764 | ic->i_recv_ring.w_nr * |
| 765 | sizeof(struct rds_header), |
| 766 | ic->i_recv_hdrs, |
| 767 | ic->i_recv_hdrs_dma); |
| 768 | |
| 769 | if (ic->i_ack) |
| 770 | ib_dma_free_coherent(dev, sizeof(struct rds_header), |
| 771 | ic->i_ack, ic->i_ack_dma); |
| 772 | |
| 773 | if (ic->i_sends) |
| 774 | rds_ib_send_clear_ring(ic); |
| 775 | if (ic->i_recvs) |
| 776 | rds_ib_recv_clear_ring(ic); |
| 777 | |
Santosh Shilimkar | 1c3be62 | 2015-08-22 15:45:32 -0700 | [diff] [blame] | 778 | rdma_destroy_id(ic->i_cm_id); |
| 779 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 780 | /* |
| 781 | * Move connection back to the nodev list. |
| 782 | */ |
Andy Grover | 745cbcc | 2009-04-01 08:20:19 +0000 | [diff] [blame] | 783 | if (ic->rds_ibdev) |
| 784 | rds_ib_remove_conn(ic->rds_ibdev, conn); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 785 | |
| 786 | ic->i_cm_id = NULL; |
| 787 | ic->i_pd = NULL; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 788 | ic->i_send_cq = NULL; |
| 789 | ic->i_recv_cq = NULL; |
| 790 | ic->i_send_hdrs = NULL; |
| 791 | ic->i_recv_hdrs = NULL; |
| 792 | ic->i_ack = NULL; |
| 793 | } |
| 794 | BUG_ON(ic->rds_ibdev); |
| 795 | |
| 796 | /* Clear pending transmit */ |
Andy Grover | ff3d7d3 | 2010-03-01 14:03:09 -0800 | [diff] [blame] | 797 | if (ic->i_data_op) { |
| 798 | struct rds_message *rm; |
| 799 | |
| 800 | rm = container_of(ic->i_data_op, struct rds_message, data); |
| 801 | rds_message_put(rm); |
| 802 | ic->i_data_op = NULL; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 803 | } |
| 804 | |
| 805 | /* Clear the ACK state */ |
| 806 | clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags); |
Andy Grover | 8cbd960 | 2009-04-01 08:20:20 +0000 | [diff] [blame] | 807 | #ifdef KERNEL_HAS_ATOMIC64 |
| 808 | atomic64_set(&ic->i_ack_next, 0); |
| 809 | #else |
| 810 | ic->i_ack_next = 0; |
| 811 | #endif |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 812 | ic->i_ack_recv = 0; |
| 813 | |
| 814 | /* Clear flow control state */ |
| 815 | ic->i_flowctl = 0; |
| 816 | atomic_set(&ic->i_credits, 0); |
| 817 | |
| 818 | rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr); |
| 819 | rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr); |
| 820 | |
| 821 | if (ic->i_ibinc) { |
| 822 | rds_inc_put(&ic->i_ibinc->ii_inc); |
| 823 | ic->i_ibinc = NULL; |
| 824 | } |
| 825 | |
| 826 | vfree(ic->i_sends); |
| 827 | ic->i_sends = NULL; |
| 828 | vfree(ic->i_recvs); |
| 829 | ic->i_recvs = NULL; |
| 830 | } |
| 831 | |
| 832 | int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp) |
| 833 | { |
| 834 | struct rds_ib_connection *ic; |
| 835 | unsigned long flags; |
Chris Mason | 3324412 | 2010-05-26 22:05:37 -0700 | [diff] [blame] | 836 | int ret; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 837 | |
| 838 | /* XXX too lazy? */ |
Dan Carpenter | f0229ea | 2012-03-21 20:44:09 +0000 | [diff] [blame] | 839 | ic = kzalloc(sizeof(struct rds_ib_connection), gfp); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 840 | if (!ic) |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 841 | return -ENOMEM; |
| 842 | |
Chris Mason | 3324412 | 2010-05-26 22:05:37 -0700 | [diff] [blame] | 843 | ret = rds_ib_recv_alloc_caches(ic); |
| 844 | if (ret) { |
| 845 | kfree(ic); |
| 846 | return ret; |
| 847 | } |
| 848 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 849 | INIT_LIST_HEAD(&ic->ib_node); |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 850 | tasklet_init(&ic->i_send_tasklet, rds_ib_tasklet_fn_send, |
| 851 | (unsigned long)ic); |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 852 | tasklet_init(&ic->i_recv_tasklet, rds_ib_tasklet_fn_recv, |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 853 | (unsigned long)ic); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 854 | mutex_init(&ic->i_recv_mutex); |
Andy Grover | 8cbd960 | 2009-04-01 08:20:20 +0000 | [diff] [blame] | 855 | #ifndef KERNEL_HAS_ATOMIC64 |
| 856 | spin_lock_init(&ic->i_ack_lock); |
| 857 | #endif |
Zach Brown | f046011 | 2010-07-14 13:55:35 -0700 | [diff] [blame] | 858 | atomic_set(&ic->i_signaled_sends, 0); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 859 | |
| 860 | /* |
| 861 | * rds_ib_conn_shutdown() waits for these to be emptied so they |
| 862 | * must be initialized before it can be called. |
| 863 | */ |
| 864 | rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr); |
| 865 | rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr); |
| 866 | |
| 867 | ic->conn = conn; |
| 868 | conn->c_transport_data = ic; |
| 869 | |
| 870 | spin_lock_irqsave(&ib_nodev_conns_lock, flags); |
| 871 | list_add_tail(&ic->ib_node, &ib_nodev_conns); |
| 872 | spin_unlock_irqrestore(&ib_nodev_conns_lock, flags); |
| 873 | |
| 874 | |
| 875 | rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data); |
| 876 | return 0; |
| 877 | } |
| 878 | |
Andy Grover | 745cbcc | 2009-04-01 08:20:19 +0000 | [diff] [blame] | 879 | /* |
| 880 | * Free a connection. Connection must be shut down and not set for reconnect. |
| 881 | */ |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 882 | void rds_ib_conn_free(void *arg) |
| 883 | { |
| 884 | struct rds_ib_connection *ic = arg; |
Andy Grover | 745cbcc | 2009-04-01 08:20:19 +0000 | [diff] [blame] | 885 | spinlock_t *lock_ptr; |
| 886 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 887 | rdsdebug("ic %p\n", ic); |
Andy Grover | 745cbcc | 2009-04-01 08:20:19 +0000 | [diff] [blame] | 888 | |
| 889 | /* |
| 890 | * Conn is either on a dev's list or on the nodev list. |
| 891 | * A race with shutdown() or connect() would cause problems |
| 892 | * (since rds_ibdev would change) but that should never happen. |
| 893 | */ |
| 894 | lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock; |
| 895 | |
| 896 | spin_lock_irq(lock_ptr); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 897 | list_del(&ic->ib_node); |
Andy Grover | 745cbcc | 2009-04-01 08:20:19 +0000 | [diff] [blame] | 898 | spin_unlock_irq(lock_ptr); |
| 899 | |
Chris Mason | 3324412 | 2010-05-26 22:05:37 -0700 | [diff] [blame] | 900 | rds_ib_recv_free_caches(ic); |
| 901 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 902 | kfree(ic); |
| 903 | } |
| 904 | |
| 905 | |
| 906 | /* |
| 907 | * An error occurred on the connection |
| 908 | */ |
| 909 | void |
| 910 | __rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...) |
| 911 | { |
| 912 | va_list ap; |
| 913 | |
| 914 | rds_conn_drop(conn); |
| 915 | |
| 916 | va_start(ap, fmt); |
| 917 | vprintk(fmt, ap); |
| 918 | va_end(ap); |
| 919 | } |