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 | |
santosh.shilimkar@oracle.com | dcfd041 | 2016-03-01 15:20:45 -0800 | [diff] [blame^] | 239 | static void poll_scq(struct rds_ib_connection *ic, struct ib_cq *cq, |
| 240 | struct ib_wc *wcs) |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 241 | { |
santosh.shilimkar@oracle.com | dcfd041 | 2016-03-01 15:20:45 -0800 | [diff] [blame^] | 242 | int nr, i; |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 243 | struct ib_wc *wc; |
| 244 | |
| 245 | while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) { |
| 246 | for (i = 0; i < nr; i++) { |
| 247 | wc = wcs + i; |
| 248 | rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n", |
| 249 | (unsigned long long)wc->wr_id, wc->status, |
| 250 | wc->byte_len, be32_to_cpu(wc->ex.imm_data)); |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 251 | |
santosh.shilimkar@oracle.com | dcfd041 | 2016-03-01 15:20:45 -0800 | [diff] [blame^] | 252 | rds_ib_send_cqe_handler(ic, wc); |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 253 | } |
| 254 | } |
| 255 | } |
| 256 | |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 257 | static void rds_ib_tasklet_fn_send(unsigned long data) |
| 258 | { |
| 259 | struct rds_ib_connection *ic = (struct rds_ib_connection *)data; |
| 260 | struct rds_connection *conn = ic->conn; |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 261 | |
| 262 | rds_ib_stats_inc(s_ib_tasklet_call); |
| 263 | |
santosh.shilimkar@oracle.com | dcfd041 | 2016-03-01 15:20:45 -0800 | [diff] [blame^] | 264 | poll_scq(ic, ic->i_send_cq, ic->i_send_wc); |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 265 | ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP); |
santosh.shilimkar@oracle.com | dcfd041 | 2016-03-01 15:20:45 -0800 | [diff] [blame^] | 266 | poll_scq(ic, ic->i_send_cq, ic->i_send_wc); |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 267 | |
| 268 | if (rds_conn_up(conn) && |
| 269 | (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags) || |
| 270 | test_bit(0, &conn->c_map_queued))) |
| 271 | rds_send_xmit(ic->conn); |
| 272 | } |
| 273 | |
santosh.shilimkar@oracle.com | dcfd041 | 2016-03-01 15:20:45 -0800 | [diff] [blame^] | 274 | static void poll_rcq(struct rds_ib_connection *ic, struct ib_cq *cq, |
| 275 | struct ib_wc *wcs, |
| 276 | struct rds_ib_ack_state *ack_state) |
| 277 | { |
| 278 | int nr, i; |
| 279 | struct ib_wc *wc; |
| 280 | |
| 281 | while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) { |
| 282 | for (i = 0; i < nr; i++) { |
| 283 | wc = wcs + i; |
| 284 | rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n", |
| 285 | (unsigned long long)wc->wr_id, wc->status, |
| 286 | wc->byte_len, be32_to_cpu(wc->ex.imm_data)); |
| 287 | |
| 288 | rds_ib_recv_cqe_handler(ic, wc, ack_state); |
| 289 | } |
| 290 | } |
| 291 | } |
| 292 | |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 293 | static void rds_ib_tasklet_fn_recv(unsigned long data) |
| 294 | { |
| 295 | struct rds_ib_connection *ic = (struct rds_ib_connection *)data; |
| 296 | struct rds_connection *conn = ic->conn; |
| 297 | struct rds_ib_device *rds_ibdev = ic->rds_ibdev; |
| 298 | struct rds_ib_ack_state state; |
| 299 | |
Santosh Shilimkar | 9441c97 | 2015-09-19 14:01:09 -0400 | [diff] [blame] | 300 | if (!rds_ibdev) |
| 301 | rds_conn_drop(conn); |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 302 | |
| 303 | rds_ib_stats_inc(s_ib_tasklet_call); |
| 304 | |
| 305 | memset(&state, 0, sizeof(state)); |
santosh.shilimkar@oracle.com | dcfd041 | 2016-03-01 15:20:45 -0800 | [diff] [blame^] | 306 | poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state); |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 307 | ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); |
santosh.shilimkar@oracle.com | dcfd041 | 2016-03-01 15:20:45 -0800 | [diff] [blame^] | 308 | poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state); |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 309 | |
| 310 | if (state.ack_next_valid) |
| 311 | rds_ib_set_ack(ic, state.ack_next, state.ack_required); |
| 312 | if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) { |
| 313 | rds_send_drop_acked(conn, state.ack_recv, NULL); |
| 314 | ic->i_ack_recv = state.ack_recv; |
| 315 | } |
| 316 | |
| 317 | if (rds_conn_up(conn)) |
| 318 | rds_ib_attempt_ack(ic); |
| 319 | } |
| 320 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 321 | static void rds_ib_qp_event_handler(struct ib_event *event, void *data) |
| 322 | { |
| 323 | struct rds_connection *conn = data; |
| 324 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 325 | |
Zach Brown | 1bde04a | 2010-07-14 14:01:21 -0700 | [diff] [blame] | 326 | 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] | 327 | ib_event_msg(event->event)); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 328 | |
| 329 | switch (event->event) { |
| 330 | case IB_EVENT_COMM_EST: |
| 331 | rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST); |
| 332 | break; |
| 333 | default: |
Zach Brown | 1bde04a | 2010-07-14 14:01:21 -0700 | [diff] [blame] | 334 | rdsdebug("Fatal QP Event %u (%s) " |
Andy Grover | fdf6e6b | 2009-07-17 13:13:31 +0000 | [diff] [blame] | 335 | "- connection %pI4->%pI4, reconnecting\n", |
Sagi Grimberg | 3c88f3d | 2015-05-18 13:40:33 +0300 | [diff] [blame] | 336 | event->event, ib_event_msg(event->event), |
Zach Brown | 1bde04a | 2010-07-14 14:01:21 -0700 | [diff] [blame] | 337 | &conn->c_laddr, &conn->c_faddr); |
Andy Grover | 9706978 | 2010-03-11 13:50:02 +0000 | [diff] [blame] | 338 | rds_conn_drop(conn); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 339 | break; |
| 340 | } |
| 341 | } |
| 342 | |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 343 | static void rds_ib_cq_comp_handler_send(struct ib_cq *cq, void *context) |
| 344 | { |
| 345 | struct rds_connection *conn = context; |
| 346 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 347 | |
| 348 | rdsdebug("conn %p cq %p\n", conn, cq); |
| 349 | |
| 350 | rds_ib_stats_inc(s_ib_evt_handler_call); |
| 351 | |
| 352 | tasklet_schedule(&ic->i_send_tasklet); |
| 353 | } |
| 354 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 355 | /* |
| 356 | * This needs to be very careful to not leave IS_ERR pointers around for |
| 357 | * cleanup to trip over. |
| 358 | */ |
| 359 | static int rds_ib_setup_qp(struct rds_connection *conn) |
| 360 | { |
| 361 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 362 | struct ib_device *dev = ic->i_cm_id->device; |
| 363 | struct ib_qp_init_attr attr; |
Matan Barak | 8e37210 | 2015-06-11 16:35:21 +0300 | [diff] [blame] | 364 | struct ib_cq_init_attr cq_attr = {}; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 365 | struct rds_ib_device *rds_ibdev; |
| 366 | int ret; |
| 367 | |
Zach Brown | 3e0249f | 2010-05-18 15:48:51 -0700 | [diff] [blame] | 368 | /* |
| 369 | * It's normal to see a null device if an incoming connection races |
| 370 | * with device removal, so we don't print a warning. |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 371 | */ |
Zach Brown | 3e0249f | 2010-05-18 15:48:51 -0700 | [diff] [blame] | 372 | rds_ibdev = rds_ib_get_client_data(dev); |
| 373 | if (!rds_ibdev) |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 374 | return -EOPNOTSUPP; |
Zach Brown | 3e0249f | 2010-05-18 15:48:51 -0700 | [diff] [blame] | 375 | |
| 376 | /* add the conn now so that connection establishment has the dev */ |
| 377 | rds_ib_add_conn(rds_ibdev, conn); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 378 | |
| 379 | if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1) |
| 380 | rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1); |
| 381 | if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1) |
| 382 | rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1); |
| 383 | |
| 384 | /* Protection domain and memory range */ |
| 385 | ic->i_pd = rds_ibdev->pd; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 386 | |
Matan Barak | 8e37210 | 2015-06-11 16:35:21 +0300 | [diff] [blame] | 387 | cq_attr.cqe = ic->i_send_ring.w_nr + 1; |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 388 | |
| 389 | 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] | 390 | rds_ib_cq_event_handler, conn, |
Matan Barak | 8e37210 | 2015-06-11 16:35:21 +0300 | [diff] [blame] | 391 | &cq_attr); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 392 | if (IS_ERR(ic->i_send_cq)) { |
| 393 | ret = PTR_ERR(ic->i_send_cq); |
| 394 | ic->i_send_cq = NULL; |
| 395 | rdsdebug("ib_create_cq send failed: %d\n", ret); |
| 396 | goto out; |
| 397 | } |
| 398 | |
Matan Barak | 8e37210 | 2015-06-11 16:35:21 +0300 | [diff] [blame] | 399 | cq_attr.cqe = ic->i_recv_ring.w_nr; |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 400 | 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] | 401 | rds_ib_cq_event_handler, conn, |
Matan Barak | 8e37210 | 2015-06-11 16:35:21 +0300 | [diff] [blame] | 402 | &cq_attr); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 403 | if (IS_ERR(ic->i_recv_cq)) { |
| 404 | ret = PTR_ERR(ic->i_recv_cq); |
| 405 | ic->i_recv_cq = NULL; |
| 406 | rdsdebug("ib_create_cq recv failed: %d\n", ret); |
| 407 | goto out; |
| 408 | } |
| 409 | |
| 410 | ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP); |
| 411 | if (ret) { |
| 412 | rdsdebug("ib_req_notify_cq send failed: %d\n", ret); |
| 413 | goto out; |
| 414 | } |
| 415 | |
| 416 | ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); |
| 417 | if (ret) { |
| 418 | rdsdebug("ib_req_notify_cq recv failed: %d\n", ret); |
| 419 | goto out; |
| 420 | } |
| 421 | |
| 422 | /* XXX negotiate max send/recv with remote? */ |
| 423 | memset(&attr, 0, sizeof(attr)); |
| 424 | attr.event_handler = rds_ib_qp_event_handler; |
| 425 | attr.qp_context = conn; |
| 426 | /* + 1 to allow for the single ack message */ |
| 427 | attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1; |
| 428 | attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1; |
| 429 | attr.cap.max_send_sge = rds_ibdev->max_sge; |
| 430 | attr.cap.max_recv_sge = RDS_IB_RECV_SGE; |
| 431 | attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
| 432 | attr.qp_type = IB_QPT_RC; |
| 433 | attr.send_cq = ic->i_send_cq; |
| 434 | attr.recv_cq = ic->i_recv_cq; |
| 435 | |
| 436 | /* |
| 437 | * XXX this can fail if max_*_wr is too large? Are we supposed |
| 438 | * to back off until we get a value that the hardware can support? |
| 439 | */ |
| 440 | ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr); |
| 441 | if (ret) { |
| 442 | rdsdebug("rdma_create_qp failed: %d\n", ret); |
| 443 | goto out; |
| 444 | } |
| 445 | |
| 446 | ic->i_send_hdrs = ib_dma_alloc_coherent(dev, |
| 447 | ic->i_send_ring.w_nr * |
| 448 | sizeof(struct rds_header), |
| 449 | &ic->i_send_hdrs_dma, GFP_KERNEL); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 450 | if (!ic->i_send_hdrs) { |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 451 | ret = -ENOMEM; |
| 452 | rdsdebug("ib_dma_alloc_coherent send failed\n"); |
| 453 | goto out; |
| 454 | } |
| 455 | |
| 456 | ic->i_recv_hdrs = ib_dma_alloc_coherent(dev, |
| 457 | ic->i_recv_ring.w_nr * |
| 458 | sizeof(struct rds_header), |
| 459 | &ic->i_recv_hdrs_dma, GFP_KERNEL); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 460 | if (!ic->i_recv_hdrs) { |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 461 | ret = -ENOMEM; |
| 462 | rdsdebug("ib_dma_alloc_coherent recv failed\n"); |
| 463 | goto out; |
| 464 | } |
| 465 | |
| 466 | ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header), |
| 467 | &ic->i_ack_dma, GFP_KERNEL); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 468 | if (!ic->i_ack) { |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 469 | ret = -ENOMEM; |
| 470 | rdsdebug("ib_dma_alloc_coherent ack failed\n"); |
| 471 | goto out; |
| 472 | } |
| 473 | |
Joe Perches | 3dbd443 | 2011-05-28 10:36:35 -0700 | [diff] [blame] | 474 | 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] | 475 | ibdev_to_node(dev)); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 476 | if (!ic->i_sends) { |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 477 | ret = -ENOMEM; |
| 478 | rdsdebug("send allocation failed\n"); |
| 479 | goto out; |
| 480 | } |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 481 | |
Joe Perches | 3dbd443 | 2011-05-28 10:36:35 -0700 | [diff] [blame] | 482 | 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] | 483 | ibdev_to_node(dev)); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 484 | if (!ic->i_recvs) { |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 485 | ret = -ENOMEM; |
| 486 | rdsdebug("recv allocation failed\n"); |
| 487 | goto out; |
| 488 | } |
| 489 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 490 | rds_ib_recv_init_ack(ic); |
| 491 | |
Jason Gunthorpe | e558024 | 2015-07-30 17:22:26 -0600 | [diff] [blame] | 492 | 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] | 493 | ic->i_send_cq, ic->i_recv_cq); |
| 494 | |
| 495 | out: |
Zach Brown | 3e0249f | 2010-05-18 15:48:51 -0700 | [diff] [blame] | 496 | rds_ib_dev_put(rds_ibdev); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 497 | return ret; |
| 498 | } |
| 499 | |
Andy Grover | 9ddbcfa | 2009-07-17 13:13:23 +0000 | [diff] [blame] | 500 | static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event) |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 501 | { |
Andy Grover | 9ddbcfa | 2009-07-17 13:13:23 +0000 | [diff] [blame] | 502 | const struct rds_ib_connect_private *dp = event->param.conn.private_data; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 503 | u16 common; |
| 504 | u32 version = 0; |
| 505 | |
Andy Grover | 9ddbcfa | 2009-07-17 13:13:23 +0000 | [diff] [blame] | 506 | /* |
| 507 | * 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] | 508 | * request, we will be given a pretty large buffer without telling us the |
| 509 | * original size. The only way to tell the difference is by looking at |
| 510 | * the contents, which are initialized to zero. |
| 511 | * If the protocol version fields aren't set, this is a connection attempt |
| 512 | * 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] | 513 | * We really should have changed this for OFED 1.3 :-( |
| 514 | */ |
| 515 | |
| 516 | /* Be paranoid. RDS always has privdata */ |
| 517 | if (!event->param.conn.private_data_len) { |
| 518 | printk(KERN_NOTICE "RDS incoming connection has no private data, " |
| 519 | "rejecting\n"); |
| 520 | return 0; |
| 521 | } |
| 522 | |
| 523 | /* 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] | 524 | if (event->param.conn.private_data_len < sizeof (*dp) || |
| 525 | dp->dp_protocol_major == 0) |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 526 | return RDS_PROTOCOL_3_0; |
| 527 | |
| 528 | common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS; |
| 529 | if (dp->dp_protocol_major == 3 && common) { |
| 530 | version = RDS_PROTOCOL_3_0; |
| 531 | while ((common >>= 1) != 0) |
| 532 | version++; |
Marciniszyn, Mike | a496759 | 2012-12-21 08:01:54 +0000 | [diff] [blame] | 533 | } else |
| 534 | printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using incompatible protocol version %u.%u\n", |
| 535 | &dp->dp_saddr, |
| 536 | dp->dp_protocol_major, |
| 537 | dp->dp_protocol_minor); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 538 | return version; |
| 539 | } |
| 540 | |
| 541 | int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, |
| 542 | struct rdma_cm_event *event) |
| 543 | { |
| 544 | __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id; |
| 545 | __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id; |
| 546 | const struct rds_ib_connect_private *dp = event->param.conn.private_data; |
| 547 | struct rds_ib_connect_private dp_rep; |
| 548 | struct rds_connection *conn = NULL; |
| 549 | struct rds_ib_connection *ic = NULL; |
| 550 | struct rdma_conn_param conn_param; |
| 551 | u32 version; |
Zach Brown | a46ca94 | 2010-05-24 13:14:59 -0700 | [diff] [blame] | 552 | int err = 1, destroy = 1; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 553 | |
| 554 | /* Check whether the remote protocol version matches ours. */ |
Andy Grover | 9ddbcfa | 2009-07-17 13:13:23 +0000 | [diff] [blame] | 555 | version = rds_ib_protocol_compatible(event); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 556 | if (!version) |
| 557 | goto out; |
| 558 | |
| 559 | rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid " |
| 560 | "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr, |
| 561 | RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version), |
| 562 | (unsigned long long)be64_to_cpu(lguid), |
| 563 | (unsigned long long)be64_to_cpu(fguid)); |
| 564 | |
Sowmini Varadhan | d5a8ac2 | 2015-08-05 01:43:25 -0400 | [diff] [blame] | 565 | /* RDS/IB is not currently netns aware, thus init_net */ |
| 566 | conn = rds_conn_create(&init_net, dp->dp_daddr, dp->dp_saddr, |
| 567 | &rds_ib_transport, GFP_KERNEL); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 568 | if (IS_ERR(conn)) { |
| 569 | rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn)); |
| 570 | conn = NULL; |
| 571 | goto out; |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * The connection request may occur while the |
| 576 | * previous connection exist, e.g. in case of failover. |
| 577 | * But as connections may be initiated simultaneously |
| 578 | * by both hosts, we have a random backoff mechanism - |
| 579 | * see the comment above rds_queue_reconnect() |
| 580 | */ |
| 581 | mutex_lock(&conn->c_cm_lock); |
| 582 | if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) { |
| 583 | if (rds_conn_state(conn) == RDS_CONN_UP) { |
| 584 | rdsdebug("incoming connect while connecting\n"); |
| 585 | rds_conn_drop(conn); |
| 586 | rds_ib_stats_inc(s_ib_listen_closed_stale); |
| 587 | } else |
| 588 | if (rds_conn_state(conn) == RDS_CONN_CONNECTING) { |
| 589 | /* Wait and see - our connect may still be succeeding */ |
| 590 | rds_ib_stats_inc(s_ib_connect_raced); |
| 591 | } |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 592 | goto out; |
| 593 | } |
| 594 | |
| 595 | ic = conn->c_transport_data; |
| 596 | |
| 597 | rds_ib_set_protocol(conn, version); |
| 598 | rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); |
| 599 | |
| 600 | /* If the peer gave us the last packet it saw, process this as if |
| 601 | * we had received a regular ACK. */ |
| 602 | if (dp->dp_ack_seq) |
| 603 | rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL); |
| 604 | |
| 605 | BUG_ON(cm_id->context); |
| 606 | BUG_ON(ic->i_cm_id); |
| 607 | |
| 608 | ic->i_cm_id = cm_id; |
| 609 | cm_id->context = conn; |
| 610 | |
| 611 | /* We got halfway through setting up the ib_connection, if we |
| 612 | * fail now, we have to take the long route out of this mess. */ |
| 613 | destroy = 0; |
| 614 | |
| 615 | err = rds_ib_setup_qp(conn); |
| 616 | if (err) { |
| 617 | rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err); |
| 618 | goto out; |
| 619 | } |
| 620 | |
Andy Grover | 40589e7 | 2010-01-12 10:50:48 -0800 | [diff] [blame] | 621 | rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version, |
| 622 | event->param.conn.responder_resources, |
| 623 | event->param.conn.initiator_depth); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 624 | |
| 625 | /* rdma_accept() calls rdma_reject() internally if it fails */ |
| 626 | err = rdma_accept(cm_id, &conn_param); |
Zach Brown | a46ca94 | 2010-05-24 13:14:59 -0700 | [diff] [blame] | 627 | if (err) |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 628 | rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 629 | |
| 630 | out: |
Zach Brown | a46ca94 | 2010-05-24 13:14:59 -0700 | [diff] [blame] | 631 | if (conn) |
| 632 | mutex_unlock(&conn->c_cm_lock); |
| 633 | if (err) |
| 634 | rdma_reject(cm_id, NULL, 0); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 635 | return destroy; |
| 636 | } |
| 637 | |
| 638 | |
| 639 | int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id) |
| 640 | { |
| 641 | struct rds_connection *conn = cm_id->context; |
| 642 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 643 | struct rdma_conn_param conn_param; |
| 644 | struct rds_ib_connect_private dp; |
| 645 | int ret; |
| 646 | |
| 647 | /* If the peer doesn't do protocol negotiation, we must |
| 648 | * default to RDSv3.0 */ |
| 649 | rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0); |
| 650 | ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */ |
| 651 | |
| 652 | ret = rds_ib_setup_qp(conn); |
| 653 | if (ret) { |
| 654 | rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret); |
| 655 | goto out; |
| 656 | } |
| 657 | |
Andy Grover | 40589e7 | 2010-01-12 10:50:48 -0800 | [diff] [blame] | 658 | rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION, |
| 659 | UINT_MAX, UINT_MAX); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 660 | ret = rdma_connect(cm_id, &conn_param); |
| 661 | if (ret) |
| 662 | rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret); |
| 663 | |
| 664 | out: |
| 665 | /* Beware - returning non-zero tells the rdma_cm to destroy |
| 666 | * the cm_id. We should certainly not do it as long as we still |
| 667 | * "own" the cm_id. */ |
| 668 | if (ret) { |
| 669 | if (ic->i_cm_id == cm_id) |
| 670 | ret = 0; |
| 671 | } |
| 672 | return ret; |
| 673 | } |
| 674 | |
| 675 | int rds_ib_conn_connect(struct rds_connection *conn) |
| 676 | { |
| 677 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 678 | struct sockaddr_in src, dest; |
| 679 | int ret; |
| 680 | |
| 681 | /* XXX I wonder what affect the port space has */ |
| 682 | /* delegate cm event handler to rdma_transport */ |
Guy Shapiro | fa20105 | 2015-10-22 15:20:10 +0300 | [diff] [blame] | 683 | 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] | 684 | RDMA_PS_TCP, IB_QPT_RC); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 685 | if (IS_ERR(ic->i_cm_id)) { |
| 686 | ret = PTR_ERR(ic->i_cm_id); |
| 687 | ic->i_cm_id = NULL; |
| 688 | rdsdebug("rdma_create_id() failed: %d\n", ret); |
| 689 | goto out; |
| 690 | } |
| 691 | |
| 692 | rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn); |
| 693 | |
| 694 | src.sin_family = AF_INET; |
| 695 | src.sin_addr.s_addr = (__force u32)conn->c_laddr; |
| 696 | src.sin_port = (__force u16)htons(0); |
| 697 | |
| 698 | dest.sin_family = AF_INET; |
| 699 | dest.sin_addr.s_addr = (__force u32)conn->c_faddr; |
| 700 | dest.sin_port = (__force u16)htons(RDS_PORT); |
| 701 | |
| 702 | ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src, |
| 703 | (struct sockaddr *)&dest, |
| 704 | RDS_RDMA_RESOLVE_TIMEOUT_MS); |
| 705 | if (ret) { |
| 706 | rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id, |
| 707 | ret); |
| 708 | rdma_destroy_id(ic->i_cm_id); |
| 709 | ic->i_cm_id = NULL; |
| 710 | } |
| 711 | |
| 712 | out: |
| 713 | return ret; |
| 714 | } |
| 715 | |
| 716 | /* |
| 717 | * This is so careful about only cleaning up resources that were built up |
| 718 | * so that it can be called at any point during startup. In fact it |
| 719 | * can be called multiple times for a given connection. |
| 720 | */ |
| 721 | void rds_ib_conn_shutdown(struct rds_connection *conn) |
| 722 | { |
| 723 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 724 | int err = 0; |
| 725 | |
| 726 | rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id, |
| 727 | ic->i_pd, ic->i_send_cq, ic->i_recv_cq, |
| 728 | ic->i_cm_id ? ic->i_cm_id->qp : NULL); |
| 729 | |
| 730 | if (ic->i_cm_id) { |
| 731 | struct ib_device *dev = ic->i_cm_id->device; |
| 732 | |
| 733 | rdsdebug("disconnecting cm %p\n", ic->i_cm_id); |
| 734 | err = rdma_disconnect(ic->i_cm_id); |
| 735 | if (err) { |
| 736 | /* Actually this may happen quite frequently, when |
| 737 | * an outgoing connect raced with an incoming connect. |
| 738 | */ |
| 739 | rdsdebug("failed to disconnect, cm: %p err %d\n", |
| 740 | ic->i_cm_id, err); |
| 741 | } |
| 742 | |
Andy Grover | e32b4a7 | 2010-03-03 19:25:21 -0800 | [diff] [blame] | 743 | /* |
Zach Brown | f046011 | 2010-07-14 13:55:35 -0700 | [diff] [blame] | 744 | * We want to wait for tx and rx completion to finish |
| 745 | * before we tear down the connection, but we have to be |
| 746 | * careful not to get stuck waiting on a send ring that |
| 747 | * only has unsignaled sends in it. We've shutdown new |
| 748 | * sends before getting here so by waiting for signaled |
| 749 | * sends to complete we're ensured that there will be no |
| 750 | * more tx processing. |
Andy Grover | e32b4a7 | 2010-03-03 19:25:21 -0800 | [diff] [blame] | 751 | */ |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 752 | wait_event(rds_ib_ring_empty_wait, |
Zach Brown | f046011 | 2010-07-14 13:55:35 -0700 | [diff] [blame] | 753 | rds_ib_ring_empty(&ic->i_recv_ring) && |
| 754 | (atomic_read(&ic->i_signaled_sends) == 0)); |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 755 | tasklet_kill(&ic->i_send_tasklet); |
Zach Brown | f046011 | 2010-07-14 13:55:35 -0700 | [diff] [blame] | 756 | tasklet_kill(&ic->i_recv_tasklet); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 757 | |
santosh.shilimkar@oracle.com | 1bc7b863 | 2015-08-22 15:45:24 -0700 | [diff] [blame] | 758 | /* first destroy the ib state that generates callbacks */ |
| 759 | if (ic->i_cm_id->qp) |
| 760 | rdma_destroy_qp(ic->i_cm_id); |
| 761 | if (ic->i_send_cq) |
| 762 | ib_destroy_cq(ic->i_send_cq); |
| 763 | if (ic->i_recv_cq) |
| 764 | ib_destroy_cq(ic->i_recv_cq); |
santosh.shilimkar@oracle.com | 1bc7b863 | 2015-08-22 15:45:24 -0700 | [diff] [blame] | 765 | |
| 766 | /* then free the resources that ib callbacks use */ |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 767 | if (ic->i_send_hdrs) |
| 768 | ib_dma_free_coherent(dev, |
| 769 | ic->i_send_ring.w_nr * |
| 770 | sizeof(struct rds_header), |
| 771 | ic->i_send_hdrs, |
| 772 | ic->i_send_hdrs_dma); |
| 773 | |
| 774 | if (ic->i_recv_hdrs) |
| 775 | ib_dma_free_coherent(dev, |
| 776 | ic->i_recv_ring.w_nr * |
| 777 | sizeof(struct rds_header), |
| 778 | ic->i_recv_hdrs, |
| 779 | ic->i_recv_hdrs_dma); |
| 780 | |
| 781 | if (ic->i_ack) |
| 782 | ib_dma_free_coherent(dev, sizeof(struct rds_header), |
| 783 | ic->i_ack, ic->i_ack_dma); |
| 784 | |
| 785 | if (ic->i_sends) |
| 786 | rds_ib_send_clear_ring(ic); |
| 787 | if (ic->i_recvs) |
| 788 | rds_ib_recv_clear_ring(ic); |
| 789 | |
Santosh Shilimkar | 1c3be62 | 2015-08-22 15:45:32 -0700 | [diff] [blame] | 790 | rdma_destroy_id(ic->i_cm_id); |
| 791 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 792 | /* |
| 793 | * Move connection back to the nodev list. |
| 794 | */ |
Andy Grover | 745cbcc | 2009-04-01 08:20:19 +0000 | [diff] [blame] | 795 | if (ic->rds_ibdev) |
| 796 | rds_ib_remove_conn(ic->rds_ibdev, conn); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 797 | |
| 798 | ic->i_cm_id = NULL; |
| 799 | ic->i_pd = NULL; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 800 | ic->i_send_cq = NULL; |
| 801 | ic->i_recv_cq = NULL; |
| 802 | ic->i_send_hdrs = NULL; |
| 803 | ic->i_recv_hdrs = NULL; |
| 804 | ic->i_ack = NULL; |
| 805 | } |
| 806 | BUG_ON(ic->rds_ibdev); |
| 807 | |
| 808 | /* Clear pending transmit */ |
Andy Grover | ff3d7d3 | 2010-03-01 14:03:09 -0800 | [diff] [blame] | 809 | if (ic->i_data_op) { |
| 810 | struct rds_message *rm; |
| 811 | |
| 812 | rm = container_of(ic->i_data_op, struct rds_message, data); |
| 813 | rds_message_put(rm); |
| 814 | ic->i_data_op = NULL; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 815 | } |
| 816 | |
| 817 | /* Clear the ACK state */ |
| 818 | clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags); |
Andy Grover | 8cbd960 | 2009-04-01 08:20:20 +0000 | [diff] [blame] | 819 | #ifdef KERNEL_HAS_ATOMIC64 |
| 820 | atomic64_set(&ic->i_ack_next, 0); |
| 821 | #else |
| 822 | ic->i_ack_next = 0; |
| 823 | #endif |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 824 | ic->i_ack_recv = 0; |
| 825 | |
| 826 | /* Clear flow control state */ |
| 827 | ic->i_flowctl = 0; |
| 828 | atomic_set(&ic->i_credits, 0); |
| 829 | |
| 830 | rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr); |
| 831 | rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr); |
| 832 | |
| 833 | if (ic->i_ibinc) { |
| 834 | rds_inc_put(&ic->i_ibinc->ii_inc); |
| 835 | ic->i_ibinc = NULL; |
| 836 | } |
| 837 | |
| 838 | vfree(ic->i_sends); |
| 839 | ic->i_sends = NULL; |
| 840 | vfree(ic->i_recvs); |
| 841 | ic->i_recvs = NULL; |
| 842 | } |
| 843 | |
| 844 | int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp) |
| 845 | { |
| 846 | struct rds_ib_connection *ic; |
| 847 | unsigned long flags; |
Chris Mason | 3324412 | 2010-05-26 22:05:37 -0700 | [diff] [blame] | 848 | int ret; |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 849 | |
| 850 | /* XXX too lazy? */ |
Dan Carpenter | f0229ea | 2012-03-21 20:44:09 +0000 | [diff] [blame] | 851 | ic = kzalloc(sizeof(struct rds_ib_connection), gfp); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 852 | if (!ic) |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 853 | return -ENOMEM; |
| 854 | |
Chris Mason | 3324412 | 2010-05-26 22:05:37 -0700 | [diff] [blame] | 855 | ret = rds_ib_recv_alloc_caches(ic); |
| 856 | if (ret) { |
| 857 | kfree(ic); |
| 858 | return ret; |
| 859 | } |
| 860 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 861 | INIT_LIST_HEAD(&ic->ib_node); |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 862 | tasklet_init(&ic->i_send_tasklet, rds_ib_tasklet_fn_send, |
| 863 | (unsigned long)ic); |
Santosh Shilimkar | f4f943c | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 864 | tasklet_init(&ic->i_recv_tasklet, rds_ib_tasklet_fn_recv, |
Santosh Shilimkar | 0c28c04 | 2015-09-06 02:18:51 -0400 | [diff] [blame] | 865 | (unsigned long)ic); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 866 | mutex_init(&ic->i_recv_mutex); |
Andy Grover | 8cbd960 | 2009-04-01 08:20:20 +0000 | [diff] [blame] | 867 | #ifndef KERNEL_HAS_ATOMIC64 |
| 868 | spin_lock_init(&ic->i_ack_lock); |
| 869 | #endif |
Zach Brown | f046011 | 2010-07-14 13:55:35 -0700 | [diff] [blame] | 870 | atomic_set(&ic->i_signaled_sends, 0); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 871 | |
| 872 | /* |
| 873 | * rds_ib_conn_shutdown() waits for these to be emptied so they |
| 874 | * must be initialized before it can be called. |
| 875 | */ |
| 876 | rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr); |
| 877 | rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr); |
| 878 | |
| 879 | ic->conn = conn; |
| 880 | conn->c_transport_data = ic; |
| 881 | |
| 882 | spin_lock_irqsave(&ib_nodev_conns_lock, flags); |
| 883 | list_add_tail(&ic->ib_node, &ib_nodev_conns); |
| 884 | spin_unlock_irqrestore(&ib_nodev_conns_lock, flags); |
| 885 | |
| 886 | |
| 887 | rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data); |
| 888 | return 0; |
| 889 | } |
| 890 | |
Andy Grover | 745cbcc | 2009-04-01 08:20:19 +0000 | [diff] [blame] | 891 | /* |
| 892 | * Free a connection. Connection must be shut down and not set for reconnect. |
| 893 | */ |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 894 | void rds_ib_conn_free(void *arg) |
| 895 | { |
| 896 | struct rds_ib_connection *ic = arg; |
Andy Grover | 745cbcc | 2009-04-01 08:20:19 +0000 | [diff] [blame] | 897 | spinlock_t *lock_ptr; |
| 898 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 899 | rdsdebug("ic %p\n", ic); |
Andy Grover | 745cbcc | 2009-04-01 08:20:19 +0000 | [diff] [blame] | 900 | |
| 901 | /* |
| 902 | * Conn is either on a dev's list or on the nodev list. |
| 903 | * A race with shutdown() or connect() would cause problems |
| 904 | * (since rds_ibdev would change) but that should never happen. |
| 905 | */ |
| 906 | lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock; |
| 907 | |
| 908 | spin_lock_irq(lock_ptr); |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 909 | list_del(&ic->ib_node); |
Andy Grover | 745cbcc | 2009-04-01 08:20:19 +0000 | [diff] [blame] | 910 | spin_unlock_irq(lock_ptr); |
| 911 | |
Chris Mason | 3324412 | 2010-05-26 22:05:37 -0700 | [diff] [blame] | 912 | rds_ib_recv_free_caches(ic); |
| 913 | |
Andy Grover | ec16227 | 2009-02-24 15:30:30 +0000 | [diff] [blame] | 914 | kfree(ic); |
| 915 | } |
| 916 | |
| 917 | |
| 918 | /* |
| 919 | * An error occurred on the connection |
| 920 | */ |
| 921 | void |
| 922 | __rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...) |
| 923 | { |
| 924 | va_list ap; |
| 925 | |
| 926 | rds_conn_drop(conn); |
| 927 | |
| 928 | va_start(ap, fmt); |
| 929 | vprintk(fmt, ap); |
| 930 | va_end(ap); |
| 931 | } |