Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 34 | #include <linux/slab.h> |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 35 | #include <linux/pci.h> |
| 36 | #include <linux/dma-mapping.h> |
| 37 | #include <rdma/rdma_cm.h> |
| 38 | |
| 39 | #include "rds.h" |
| 40 | #include "ib.h" |
| 41 | |
| 42 | static struct kmem_cache *rds_ib_incoming_slab; |
| 43 | static struct kmem_cache *rds_ib_frag_slab; |
| 44 | static atomic_t rds_ib_allocation = ATOMIC_INIT(0); |
| 45 | |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 46 | /* Free frag and attached recv buffer f_sg */ |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 47 | static void rds_ib_frag_free(struct rds_page_frag *frag) |
| 48 | { |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 49 | rdsdebug("frag %p page %p\n", frag, sg_page(&frag->f_sg)); |
| 50 | __free_page(sg_page(&frag->f_sg)); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 51 | kmem_cache_free(rds_ib_frag_slab, frag); |
| 52 | } |
| 53 | |
| 54 | /* |
| 55 | * We map a page at a time. Its fragments are posted in order. This |
| 56 | * is called in fragment order as the fragments get send completion events. |
| 57 | * Only the last frag in the page performs the unmapping. |
| 58 | * |
| 59 | * It's OK for ring cleanup to call this in whatever order it likes because |
| 60 | * DMA is not in flight and so we can unmap while other ring entries still |
| 61 | * hold page references in their frags. |
| 62 | */ |
| 63 | static void rds_ib_recv_unmap_page(struct rds_ib_connection *ic, |
| 64 | struct rds_ib_recv_work *recv) |
| 65 | { |
| 66 | struct rds_page_frag *frag = recv->r_frag; |
| 67 | |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 68 | rdsdebug("recv %p frag %p page %p\n", recv, frag, sg_page(&frag->f_sg)); |
| 69 | ib_dma_unmap_sg(ic->i_cm_id->device, &frag->f_sg, 1, DMA_FROM_DEVICE); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | void rds_ib_recv_init_ring(struct rds_ib_connection *ic) |
| 73 | { |
| 74 | struct rds_ib_recv_work *recv; |
| 75 | u32 i; |
| 76 | |
| 77 | for (i = 0, recv = ic->i_recvs; i < ic->i_recv_ring.w_nr; i++, recv++) { |
| 78 | struct ib_sge *sge; |
| 79 | |
| 80 | recv->r_ibinc = NULL; |
| 81 | recv->r_frag = NULL; |
| 82 | |
| 83 | recv->r_wr.next = NULL; |
| 84 | recv->r_wr.wr_id = i; |
| 85 | recv->r_wr.sg_list = recv->r_sge; |
| 86 | recv->r_wr.num_sge = RDS_IB_RECV_SGE; |
| 87 | |
Andy Grover | 919ced4 | 2010-01-13 16:32:24 -0800 | [diff] [blame] | 88 | sge = &recv->r_sge[0]; |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 89 | sge->addr = ic->i_recv_hdrs_dma + (i * sizeof(struct rds_header)); |
| 90 | sge->length = sizeof(struct rds_header); |
| 91 | sge->lkey = ic->i_mr->lkey; |
Andy Grover | 919ced4 | 2010-01-13 16:32:24 -0800 | [diff] [blame] | 92 | |
| 93 | sge = &recv->r_sge[1]; |
| 94 | sge->addr = 0; |
| 95 | sge->length = RDS_FRAG_SIZE; |
| 96 | sge->lkey = ic->i_mr->lkey; |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 97 | } |
| 98 | } |
| 99 | |
| 100 | static void rds_ib_recv_clear_one(struct rds_ib_connection *ic, |
| 101 | struct rds_ib_recv_work *recv) |
| 102 | { |
| 103 | if (recv->r_ibinc) { |
| 104 | rds_inc_put(&recv->r_ibinc->ii_inc); |
| 105 | recv->r_ibinc = NULL; |
| 106 | } |
| 107 | if (recv->r_frag) { |
| 108 | rds_ib_recv_unmap_page(ic, recv); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 109 | rds_ib_frag_free(recv->r_frag); |
| 110 | recv->r_frag = NULL; |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | void rds_ib_recv_clear_ring(struct rds_ib_connection *ic) |
| 115 | { |
| 116 | u32 i; |
| 117 | |
| 118 | for (i = 0; i < ic->i_recv_ring.w_nr; i++) |
| 119 | rds_ib_recv_clear_one(ic, &ic->i_recvs[i]); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | static int rds_ib_recv_refill_one(struct rds_connection *conn, |
Andy Grover | f17a1a5 | 2010-03-18 17:19:52 -0700 | [diff] [blame] | 123 | struct rds_ib_recv_work *recv) |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 124 | { |
| 125 | struct rds_ib_connection *ic = conn->c_transport_data; |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 126 | struct ib_sge *sge; |
| 127 | int ret = -ENOMEM; |
| 128 | |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 129 | if (!recv->r_ibinc) { |
Andy Grover | 86357b1 | 2009-10-30 08:51:54 +0000 | [diff] [blame] | 130 | if (!atomic_add_unless(&rds_ib_allocation, 1, rds_ib_sysctl_max_recv_allocation)) { |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 131 | rds_ib_stats_inc(s_ib_rx_alloc_limit); |
| 132 | goto out; |
| 133 | } |
Andy Grover | f17a1a5 | 2010-03-18 17:19:52 -0700 | [diff] [blame] | 134 | recv->r_ibinc = kmem_cache_alloc(rds_ib_incoming_slab, GFP_NOWAIT); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 135 | if (!recv->r_ibinc) { |
Andy Grover | 86357b1 | 2009-10-30 08:51:54 +0000 | [diff] [blame] | 136 | atomic_dec(&rds_ib_allocation); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 137 | goto out; |
Andy Grover | 86357b1 | 2009-10-30 08:51:54 +0000 | [diff] [blame] | 138 | } |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 139 | INIT_LIST_HEAD(&recv->r_ibinc->ii_frags); |
| 140 | rds_inc_init(&recv->r_ibinc->ii_inc, conn, conn->c_faddr); |
| 141 | } |
| 142 | |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 143 | if (!recv->r_frag) { |
Andy Grover | f17a1a5 | 2010-03-18 17:19:52 -0700 | [diff] [blame] | 144 | recv->r_frag = kmem_cache_alloc(rds_ib_frag_slab, GFP_NOWAIT); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 145 | if (!recv->r_frag) |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 146 | goto out; |
| 147 | INIT_LIST_HEAD(&recv->r_frag->f_item); |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 148 | sg_init_table(&recv->r_frag->f_sg, 1); |
| 149 | ret = rds_page_remainder_alloc(&recv->r_frag->f_sg, |
| 150 | RDS_FRAG_SIZE, GFP_NOWAIT); |
| 151 | if (ret) { |
| 152 | kmem_cache_free(rds_ib_frag_slab, recv->r_frag); |
| 153 | recv->r_frag = NULL; |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 154 | goto out; |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 155 | } |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 156 | } |
| 157 | |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 158 | ret = ib_dma_map_sg(ic->i_cm_id->device, &recv->r_frag->f_sg, |
| 159 | 1, DMA_FROM_DEVICE); |
| 160 | WARN_ON(ret != 1); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 161 | |
Andy Grover | 919ced4 | 2010-01-13 16:32:24 -0800 | [diff] [blame] | 162 | sge = &recv->r_sge[0]; |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 163 | sge->addr = ic->i_recv_hdrs_dma + (recv - ic->i_recvs) * sizeof(struct rds_header); |
| 164 | sge->length = sizeof(struct rds_header); |
| 165 | |
Andy Grover | 919ced4 | 2010-01-13 16:32:24 -0800 | [diff] [blame] | 166 | sge = &recv->r_sge[1]; |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 167 | sge->addr = sg_dma_address(&recv->r_frag->f_sg); |
| 168 | sge->length = sg_dma_len(&recv->r_frag->f_sg); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 169 | |
| 170 | ret = 0; |
| 171 | out: |
| 172 | return ret; |
| 173 | } |
| 174 | |
| 175 | /* |
| 176 | * This tries to allocate and post unused work requests after making sure that |
| 177 | * they have all the allocations they need to queue received fragments into |
| 178 | * sockets. The i_recv_mutex is held here so that ring_alloc and _unalloc |
| 179 | * pairs don't go unmatched. |
| 180 | * |
| 181 | * -1 is returned if posting fails due to temporary resource exhaustion. |
| 182 | */ |
Andy Grover | f17a1a5 | 2010-03-18 17:19:52 -0700 | [diff] [blame] | 183 | int rds_ib_recv_refill(struct rds_connection *conn, int prefill) |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 184 | { |
| 185 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 186 | struct rds_ib_recv_work *recv; |
| 187 | struct ib_recv_wr *failed_wr; |
| 188 | unsigned int posted = 0; |
| 189 | int ret = 0; |
| 190 | u32 pos; |
| 191 | |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 192 | while ((prefill || rds_conn_up(conn)) && |
| 193 | rds_ib_ring_alloc(&ic->i_recv_ring, 1, &pos)) { |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 194 | if (pos >= ic->i_recv_ring.w_nr) { |
| 195 | printk(KERN_NOTICE "Argh - ring alloc returned pos=%u\n", |
| 196 | pos); |
| 197 | ret = -EINVAL; |
| 198 | break; |
| 199 | } |
| 200 | |
| 201 | recv = &ic->i_recvs[pos]; |
Andy Grover | f17a1a5 | 2010-03-18 17:19:52 -0700 | [diff] [blame] | 202 | ret = rds_ib_recv_refill_one(conn, recv); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 203 | if (ret) { |
| 204 | ret = -1; |
| 205 | break; |
| 206 | } |
| 207 | |
| 208 | /* XXX when can this fail? */ |
| 209 | ret = ib_post_recv(ic->i_cm_id->qp, &recv->r_wr, &failed_wr); |
| 210 | rdsdebug("recv %p ibinc %p page %p addr %lu ret %d\n", recv, |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 211 | recv->r_ibinc, sg_page(&recv->r_frag->f_sg), |
| 212 | (long) sg_dma_address(&recv->r_frag->f_sg), ret); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 213 | if (ret) { |
| 214 | rds_ib_conn_error(conn, "recv post on " |
| 215 | "%pI4 returned %d, disconnecting and " |
| 216 | "reconnecting\n", &conn->c_faddr, |
| 217 | ret); |
| 218 | ret = -1; |
| 219 | break; |
| 220 | } |
| 221 | |
| 222 | posted++; |
| 223 | } |
| 224 | |
| 225 | /* We're doing flow control - update the window. */ |
| 226 | if (ic->i_flowctl && posted) |
| 227 | rds_ib_advertise_credits(conn, posted); |
| 228 | |
| 229 | if (ret) |
| 230 | rds_ib_ring_unalloc(&ic->i_recv_ring, 1); |
| 231 | return ret; |
| 232 | } |
| 233 | |
Andy Grover | 809fa14 | 2010-01-12 14:41:46 -0800 | [diff] [blame] | 234 | static void rds_ib_inc_purge(struct rds_incoming *inc) |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 235 | { |
| 236 | struct rds_ib_incoming *ibinc; |
| 237 | struct rds_page_frag *frag; |
| 238 | struct rds_page_frag *pos; |
| 239 | |
| 240 | ibinc = container_of(inc, struct rds_ib_incoming, ii_inc); |
| 241 | rdsdebug("purging ibinc %p inc %p\n", ibinc, inc); |
| 242 | |
| 243 | list_for_each_entry_safe(frag, pos, &ibinc->ii_frags, f_item) { |
| 244 | list_del_init(&frag->f_item); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 245 | rds_ib_frag_free(frag); |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | void rds_ib_inc_free(struct rds_incoming *inc) |
| 250 | { |
| 251 | struct rds_ib_incoming *ibinc; |
| 252 | |
| 253 | ibinc = container_of(inc, struct rds_ib_incoming, ii_inc); |
| 254 | |
| 255 | rds_ib_inc_purge(inc); |
| 256 | rdsdebug("freeing ibinc %p inc %p\n", ibinc, inc); |
| 257 | BUG_ON(!list_empty(&ibinc->ii_frags)); |
| 258 | kmem_cache_free(rds_ib_incoming_slab, ibinc); |
| 259 | atomic_dec(&rds_ib_allocation); |
| 260 | BUG_ON(atomic_read(&rds_ib_allocation) < 0); |
| 261 | } |
| 262 | |
| 263 | int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *first_iov, |
| 264 | size_t size) |
| 265 | { |
| 266 | struct rds_ib_incoming *ibinc; |
| 267 | struct rds_page_frag *frag; |
| 268 | struct iovec *iov = first_iov; |
| 269 | unsigned long to_copy; |
| 270 | unsigned long frag_off = 0; |
| 271 | unsigned long iov_off = 0; |
| 272 | int copied = 0; |
| 273 | int ret; |
| 274 | u32 len; |
| 275 | |
| 276 | ibinc = container_of(inc, struct rds_ib_incoming, ii_inc); |
| 277 | frag = list_entry(ibinc->ii_frags.next, struct rds_page_frag, f_item); |
| 278 | len = be32_to_cpu(inc->i_hdr.h_len); |
| 279 | |
| 280 | while (copied < size && copied < len) { |
| 281 | if (frag_off == RDS_FRAG_SIZE) { |
| 282 | frag = list_entry(frag->f_item.next, |
| 283 | struct rds_page_frag, f_item); |
| 284 | frag_off = 0; |
| 285 | } |
| 286 | while (iov_off == iov->iov_len) { |
| 287 | iov_off = 0; |
| 288 | iov++; |
| 289 | } |
| 290 | |
| 291 | to_copy = min(iov->iov_len - iov_off, RDS_FRAG_SIZE - frag_off); |
| 292 | to_copy = min_t(size_t, to_copy, size - copied); |
| 293 | to_copy = min_t(unsigned long, to_copy, len - copied); |
| 294 | |
| 295 | rdsdebug("%lu bytes to user [%p, %zu] + %lu from frag " |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 296 | "[%p, %u] + %lu\n", |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 297 | to_copy, iov->iov_base, iov->iov_len, iov_off, |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 298 | sg_page(&frag->f_sg), frag->f_sg.offset, frag_off); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 299 | |
| 300 | /* XXX needs + offset for multiple recvs per page */ |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 301 | ret = rds_page_copy_to_user(sg_page(&frag->f_sg), |
| 302 | frag->f_sg.offset + frag_off, |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 303 | iov->iov_base + iov_off, |
| 304 | to_copy); |
| 305 | if (ret) { |
| 306 | copied = ret; |
| 307 | break; |
| 308 | } |
| 309 | |
| 310 | iov_off += to_copy; |
| 311 | frag_off += to_copy; |
| 312 | copied += to_copy; |
| 313 | } |
| 314 | |
| 315 | return copied; |
| 316 | } |
| 317 | |
| 318 | /* ic starts out kzalloc()ed */ |
| 319 | void rds_ib_recv_init_ack(struct rds_ib_connection *ic) |
| 320 | { |
| 321 | struct ib_send_wr *wr = &ic->i_ack_wr; |
| 322 | struct ib_sge *sge = &ic->i_ack_sge; |
| 323 | |
| 324 | sge->addr = ic->i_ack_dma; |
| 325 | sge->length = sizeof(struct rds_header); |
| 326 | sge->lkey = ic->i_mr->lkey; |
| 327 | |
| 328 | wr->sg_list = sge; |
| 329 | wr->num_sge = 1; |
| 330 | wr->opcode = IB_WR_SEND; |
| 331 | wr->wr_id = RDS_IB_ACK_WR_ID; |
| 332 | wr->send_flags = IB_SEND_SIGNALED | IB_SEND_SOLICITED; |
| 333 | } |
| 334 | |
| 335 | /* |
| 336 | * You'd think that with reliable IB connections you wouldn't need to ack |
| 337 | * messages that have been received. The problem is that IB hardware generates |
| 338 | * an ack message before it has DMAed the message into memory. This creates a |
| 339 | * potential message loss if the HCA is disabled for any reason between when it |
| 340 | * sends the ack and before the message is DMAed and processed. This is only a |
| 341 | * potential issue if another HCA is available for fail-over. |
| 342 | * |
| 343 | * When the remote host receives our ack they'll free the sent message from |
| 344 | * their send queue. To decrease the latency of this we always send an ack |
| 345 | * immediately after we've received messages. |
| 346 | * |
| 347 | * For simplicity, we only have one ack in flight at a time. This puts |
| 348 | * pressure on senders to have deep enough send queues to absorb the latency of |
| 349 | * a single ack frame being in flight. This might not be good enough. |
| 350 | * |
| 351 | * This is implemented by have a long-lived send_wr and sge which point to a |
| 352 | * statically allocated ack frame. This ack wr does not fall under the ring |
| 353 | * accounting that the tx and rx wrs do. The QP attribute specifically makes |
| 354 | * room for it beyond the ring size. Send completion notices its special |
| 355 | * wr_id and avoids working with the ring in that case. |
| 356 | */ |
Andy Grover | 8cbd960 | 2009-04-01 08:20:20 +0000 | [diff] [blame] | 357 | #ifndef KERNEL_HAS_ATOMIC64 |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 358 | static void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, |
| 359 | int ack_required) |
| 360 | { |
Andy Grover | 8cbd960 | 2009-04-01 08:20:20 +0000 | [diff] [blame] | 361 | unsigned long flags; |
| 362 | |
| 363 | spin_lock_irqsave(&ic->i_ack_lock, flags); |
| 364 | ic->i_ack_next = seq; |
| 365 | if (ack_required) |
| 366 | set_bit(IB_ACK_REQUESTED, &ic->i_ack_flags); |
| 367 | spin_unlock_irqrestore(&ic->i_ack_lock, flags); |
| 368 | } |
| 369 | |
| 370 | static u64 rds_ib_get_ack(struct rds_ib_connection *ic) |
| 371 | { |
| 372 | unsigned long flags; |
| 373 | u64 seq; |
| 374 | |
| 375 | clear_bit(IB_ACK_REQUESTED, &ic->i_ack_flags); |
| 376 | |
| 377 | spin_lock_irqsave(&ic->i_ack_lock, flags); |
| 378 | seq = ic->i_ack_next; |
| 379 | spin_unlock_irqrestore(&ic->i_ack_lock, flags); |
| 380 | |
| 381 | return seq; |
| 382 | } |
| 383 | #else |
| 384 | static void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, |
| 385 | int ack_required) |
| 386 | { |
| 387 | atomic64_set(&ic->i_ack_next, seq); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 388 | if (ack_required) { |
| 389 | smp_mb__before_clear_bit(); |
| 390 | set_bit(IB_ACK_REQUESTED, &ic->i_ack_flags); |
| 391 | } |
| 392 | } |
| 393 | |
| 394 | static u64 rds_ib_get_ack(struct rds_ib_connection *ic) |
| 395 | { |
| 396 | clear_bit(IB_ACK_REQUESTED, &ic->i_ack_flags); |
| 397 | smp_mb__after_clear_bit(); |
| 398 | |
Andy Grover | 8cbd960 | 2009-04-01 08:20:20 +0000 | [diff] [blame] | 399 | return atomic64_read(&ic->i_ack_next); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 400 | } |
Andy Grover | 8cbd960 | 2009-04-01 08:20:20 +0000 | [diff] [blame] | 401 | #endif |
| 402 | |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 403 | |
| 404 | static void rds_ib_send_ack(struct rds_ib_connection *ic, unsigned int adv_credits) |
| 405 | { |
| 406 | struct rds_header *hdr = ic->i_ack; |
| 407 | struct ib_send_wr *failed_wr; |
| 408 | u64 seq; |
| 409 | int ret; |
| 410 | |
| 411 | seq = rds_ib_get_ack(ic); |
| 412 | |
| 413 | rdsdebug("send_ack: ic %p ack %llu\n", ic, (unsigned long long) seq); |
| 414 | rds_message_populate_header(hdr, 0, 0, 0); |
| 415 | hdr->h_ack = cpu_to_be64(seq); |
| 416 | hdr->h_credit = adv_credits; |
| 417 | rds_message_make_checksum(hdr); |
| 418 | ic->i_ack_queued = jiffies; |
| 419 | |
| 420 | ret = ib_post_send(ic->i_cm_id->qp, &ic->i_ack_wr, &failed_wr); |
| 421 | if (unlikely(ret)) { |
| 422 | /* Failed to send. Release the WR, and |
| 423 | * force another ACK. |
| 424 | */ |
| 425 | clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags); |
| 426 | set_bit(IB_ACK_REQUESTED, &ic->i_ack_flags); |
| 427 | |
| 428 | rds_ib_stats_inc(s_ib_ack_send_failure); |
Andy Grover | 735f61e | 2010-03-11 13:49:55 +0000 | [diff] [blame] | 429 | |
| 430 | rds_ib_conn_error(ic->conn, "sending ack failed\n"); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 431 | } else |
| 432 | rds_ib_stats_inc(s_ib_ack_sent); |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * There are 3 ways of getting acknowledgements to the peer: |
| 437 | * 1. We call rds_ib_attempt_ack from the recv completion handler |
| 438 | * to send an ACK-only frame. |
| 439 | * However, there can be only one such frame in the send queue |
| 440 | * at any time, so we may have to postpone it. |
| 441 | * 2. When another (data) packet is transmitted while there's |
| 442 | * an ACK in the queue, we piggyback the ACK sequence number |
| 443 | * on the data packet. |
| 444 | * 3. If the ACK WR is done sending, we get called from the |
| 445 | * send queue completion handler, and check whether there's |
| 446 | * another ACK pending (postponed because the WR was on the |
| 447 | * queue). If so, we transmit it. |
| 448 | * |
| 449 | * We maintain 2 variables: |
| 450 | * - i_ack_flags, which keeps track of whether the ACK WR |
| 451 | * is currently in the send queue or not (IB_ACK_IN_FLIGHT) |
| 452 | * - i_ack_next, which is the last sequence number we received |
| 453 | * |
| 454 | * Potentially, send queue and receive queue handlers can run concurrently. |
Andy Grover | 8cbd960 | 2009-04-01 08:20:20 +0000 | [diff] [blame] | 455 | * It would be nice to not have to use a spinlock to synchronize things, |
| 456 | * but the one problem that rules this out is that 64bit updates are |
| 457 | * not atomic on all platforms. Things would be a lot simpler if |
| 458 | * we had atomic64 or maybe cmpxchg64 everywhere. |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 459 | * |
| 460 | * Reconnecting complicates this picture just slightly. When we |
| 461 | * reconnect, we may be seeing duplicate packets. The peer |
| 462 | * is retransmitting them, because it hasn't seen an ACK for |
| 463 | * them. It is important that we ACK these. |
| 464 | * |
| 465 | * ACK mitigation adds a header flag "ACK_REQUIRED"; any packet with |
| 466 | * this flag set *MUST* be acknowledged immediately. |
| 467 | */ |
| 468 | |
| 469 | /* |
| 470 | * When we get here, we're called from the recv queue handler. |
| 471 | * Check whether we ought to transmit an ACK. |
| 472 | */ |
| 473 | void rds_ib_attempt_ack(struct rds_ib_connection *ic) |
| 474 | { |
| 475 | unsigned int adv_credits; |
| 476 | |
| 477 | if (!test_bit(IB_ACK_REQUESTED, &ic->i_ack_flags)) |
| 478 | return; |
| 479 | |
| 480 | if (test_and_set_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags)) { |
| 481 | rds_ib_stats_inc(s_ib_ack_send_delayed); |
| 482 | return; |
| 483 | } |
| 484 | |
| 485 | /* Can we get a send credit? */ |
Steve Wise | 7b70d03 | 2009-04-09 14:09:39 +0000 | [diff] [blame] | 486 | if (!rds_ib_send_grab_credits(ic, 1, &adv_credits, 0, RDS_MAX_ADV_CREDIT)) { |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 487 | rds_ib_stats_inc(s_ib_tx_throttle); |
| 488 | clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags); |
| 489 | return; |
| 490 | } |
| 491 | |
| 492 | clear_bit(IB_ACK_REQUESTED, &ic->i_ack_flags); |
| 493 | rds_ib_send_ack(ic, adv_credits); |
| 494 | } |
| 495 | |
| 496 | /* |
| 497 | * We get here from the send completion handler, when the |
| 498 | * adapter tells us the ACK frame was sent. |
| 499 | */ |
| 500 | void rds_ib_ack_send_complete(struct rds_ib_connection *ic) |
| 501 | { |
| 502 | clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags); |
| 503 | rds_ib_attempt_ack(ic); |
| 504 | } |
| 505 | |
| 506 | /* |
| 507 | * This is called by the regular xmit code when it wants to piggyback |
| 508 | * an ACK on an outgoing frame. |
| 509 | */ |
| 510 | u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic) |
| 511 | { |
| 512 | if (test_and_clear_bit(IB_ACK_REQUESTED, &ic->i_ack_flags)) |
| 513 | rds_ib_stats_inc(s_ib_ack_send_piggybacked); |
| 514 | return rds_ib_get_ack(ic); |
| 515 | } |
| 516 | |
| 517 | /* |
| 518 | * It's kind of lame that we're copying from the posted receive pages into |
| 519 | * long-lived bitmaps. We could have posted the bitmaps and rdma written into |
| 520 | * them. But receiving new congestion bitmaps should be a *rare* event, so |
| 521 | * hopefully we won't need to invest that complexity in making it more |
| 522 | * efficient. By copying we can share a simpler core with TCP which has to |
| 523 | * copy. |
| 524 | */ |
| 525 | static void rds_ib_cong_recv(struct rds_connection *conn, |
| 526 | struct rds_ib_incoming *ibinc) |
| 527 | { |
| 528 | struct rds_cong_map *map; |
| 529 | unsigned int map_off; |
| 530 | unsigned int map_page; |
| 531 | struct rds_page_frag *frag; |
| 532 | unsigned long frag_off; |
| 533 | unsigned long to_copy; |
| 534 | unsigned long copied; |
| 535 | uint64_t uncongested = 0; |
| 536 | void *addr; |
| 537 | |
| 538 | /* catch completely corrupt packets */ |
| 539 | if (be32_to_cpu(ibinc->ii_inc.i_hdr.h_len) != RDS_CONG_MAP_BYTES) |
| 540 | return; |
| 541 | |
| 542 | map = conn->c_fcong; |
| 543 | map_page = 0; |
| 544 | map_off = 0; |
| 545 | |
| 546 | frag = list_entry(ibinc->ii_frags.next, struct rds_page_frag, f_item); |
| 547 | frag_off = 0; |
| 548 | |
| 549 | copied = 0; |
| 550 | |
| 551 | while (copied < RDS_CONG_MAP_BYTES) { |
| 552 | uint64_t *src, *dst; |
| 553 | unsigned int k; |
| 554 | |
| 555 | to_copy = min(RDS_FRAG_SIZE - frag_off, PAGE_SIZE - map_off); |
| 556 | BUG_ON(to_copy & 7); /* Must be 64bit aligned. */ |
| 557 | |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 558 | addr = kmap_atomic(sg_page(&frag->f_sg), KM_SOFTIRQ0); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 559 | |
| 560 | src = addr + frag_off; |
| 561 | dst = (void *)map->m_page_addrs[map_page] + map_off; |
| 562 | for (k = 0; k < to_copy; k += 8) { |
| 563 | /* Record ports that became uncongested, ie |
| 564 | * bits that changed from 0 to 1. */ |
| 565 | uncongested |= ~(*src) & *dst; |
| 566 | *dst++ = *src++; |
| 567 | } |
| 568 | kunmap_atomic(addr, KM_SOFTIRQ0); |
| 569 | |
| 570 | copied += to_copy; |
| 571 | |
| 572 | map_off += to_copy; |
| 573 | if (map_off == PAGE_SIZE) { |
| 574 | map_off = 0; |
| 575 | map_page++; |
| 576 | } |
| 577 | |
| 578 | frag_off += to_copy; |
| 579 | if (frag_off == RDS_FRAG_SIZE) { |
| 580 | frag = list_entry(frag->f_item.next, |
| 581 | struct rds_page_frag, f_item); |
| 582 | frag_off = 0; |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | /* the congestion map is in little endian order */ |
| 587 | uncongested = le64_to_cpu(uncongested); |
| 588 | |
| 589 | rds_cong_map_updated(map, uncongested); |
| 590 | } |
| 591 | |
| 592 | /* |
| 593 | * Rings are posted with all the allocations they'll need to queue the |
| 594 | * incoming message to the receiving socket so this can't fail. |
| 595 | * All fragments start with a header, so we can make sure we're not receiving |
| 596 | * garbage, and we can tell a small 8 byte fragment from an ACK frame. |
| 597 | */ |
| 598 | struct rds_ib_ack_state { |
| 599 | u64 ack_next; |
| 600 | u64 ack_recv; |
| 601 | unsigned int ack_required:1; |
| 602 | unsigned int ack_next_valid:1; |
| 603 | unsigned int ack_recv_valid:1; |
| 604 | }; |
| 605 | |
| 606 | static void rds_ib_process_recv(struct rds_connection *conn, |
Andy Grover | 597ddd5 | 2009-07-17 13:13:27 +0000 | [diff] [blame] | 607 | struct rds_ib_recv_work *recv, u32 data_len, |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 608 | struct rds_ib_ack_state *state) |
| 609 | { |
| 610 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 611 | struct rds_ib_incoming *ibinc = ic->i_ibinc; |
| 612 | struct rds_header *ihdr, *hdr; |
| 613 | |
| 614 | /* XXX shut down the connection if port 0,0 are seen? */ |
| 615 | |
| 616 | rdsdebug("ic %p ibinc %p recv %p byte len %u\n", ic, ibinc, recv, |
Andy Grover | 597ddd5 | 2009-07-17 13:13:27 +0000 | [diff] [blame] | 617 | data_len); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 618 | |
Andy Grover | 597ddd5 | 2009-07-17 13:13:27 +0000 | [diff] [blame] | 619 | if (data_len < sizeof(struct rds_header)) { |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 620 | rds_ib_conn_error(conn, "incoming message " |
| 621 | "from %pI4 didn't inclue a " |
| 622 | "header, disconnecting and " |
| 623 | "reconnecting\n", |
| 624 | &conn->c_faddr); |
| 625 | return; |
| 626 | } |
Andy Grover | 597ddd5 | 2009-07-17 13:13:27 +0000 | [diff] [blame] | 627 | data_len -= sizeof(struct rds_header); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 628 | |
Andy Grover | f147dd9 | 2010-01-13 15:50:09 -0800 | [diff] [blame] | 629 | ihdr = &ic->i_recv_hdrs[recv - ic->i_recvs]; |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 630 | |
| 631 | /* Validate the checksum. */ |
| 632 | if (!rds_message_verify_checksum(ihdr)) { |
| 633 | rds_ib_conn_error(conn, "incoming message " |
| 634 | "from %pI4 has corrupted header - " |
| 635 | "forcing a reconnect\n", |
| 636 | &conn->c_faddr); |
| 637 | rds_stats_inc(s_recv_drop_bad_checksum); |
| 638 | return; |
| 639 | } |
| 640 | |
| 641 | /* Process the ACK sequence which comes with every packet */ |
| 642 | state->ack_recv = be64_to_cpu(ihdr->h_ack); |
| 643 | state->ack_recv_valid = 1; |
| 644 | |
| 645 | /* Process the credits update if there was one */ |
| 646 | if (ihdr->h_credit) |
| 647 | rds_ib_send_add_credits(conn, ihdr->h_credit); |
| 648 | |
Andy Grover | 597ddd5 | 2009-07-17 13:13:27 +0000 | [diff] [blame] | 649 | if (ihdr->h_sport == 0 && ihdr->h_dport == 0 && data_len == 0) { |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 650 | /* This is an ACK-only packet. The fact that it gets |
| 651 | * special treatment here is that historically, ACKs |
| 652 | * were rather special beasts. |
| 653 | */ |
| 654 | rds_ib_stats_inc(s_ib_ack_received); |
| 655 | |
| 656 | /* |
| 657 | * Usually the frags make their way on to incs and are then freed as |
| 658 | * the inc is freed. We don't go that route, so we have to drop the |
| 659 | * page ref ourselves. We can't just leave the page on the recv |
| 660 | * because that confuses the dma mapping of pages and each recv's use |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 661 | * of a partial page. |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 662 | * |
| 663 | * FIXME: Fold this into the code path below. |
| 664 | */ |
Andy Grover | 0b088e0 | 2010-05-24 20:12:41 -0700 | [diff] [blame^] | 665 | rds_ib_frag_free(recv->r_frag); |
| 666 | recv->r_frag = NULL; |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 667 | return; |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * If we don't already have an inc on the connection then this |
| 672 | * fragment has a header and starts a message.. copy its header |
| 673 | * into the inc and save the inc so we can hang upcoming fragments |
| 674 | * off its list. |
| 675 | */ |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 676 | if (!ibinc) { |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 677 | ibinc = recv->r_ibinc; |
| 678 | recv->r_ibinc = NULL; |
| 679 | ic->i_ibinc = ibinc; |
| 680 | |
| 681 | hdr = &ibinc->ii_inc.i_hdr; |
| 682 | memcpy(hdr, ihdr, sizeof(*hdr)); |
| 683 | ic->i_recv_data_rem = be32_to_cpu(hdr->h_len); |
| 684 | |
| 685 | rdsdebug("ic %p ibinc %p rem %u flag 0x%x\n", ic, ibinc, |
| 686 | ic->i_recv_data_rem, hdr->h_flags); |
| 687 | } else { |
| 688 | hdr = &ibinc->ii_inc.i_hdr; |
| 689 | /* We can't just use memcmp here; fragments of a |
| 690 | * single message may carry different ACKs */ |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 691 | if (hdr->h_sequence != ihdr->h_sequence || |
| 692 | hdr->h_len != ihdr->h_len || |
| 693 | hdr->h_sport != ihdr->h_sport || |
| 694 | hdr->h_dport != ihdr->h_dport) { |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 695 | rds_ib_conn_error(conn, |
| 696 | "fragment header mismatch; forcing reconnect\n"); |
| 697 | return; |
| 698 | } |
| 699 | } |
| 700 | |
| 701 | list_add_tail(&recv->r_frag->f_item, &ibinc->ii_frags); |
| 702 | recv->r_frag = NULL; |
| 703 | |
| 704 | if (ic->i_recv_data_rem > RDS_FRAG_SIZE) |
| 705 | ic->i_recv_data_rem -= RDS_FRAG_SIZE; |
| 706 | else { |
| 707 | ic->i_recv_data_rem = 0; |
| 708 | ic->i_ibinc = NULL; |
| 709 | |
| 710 | if (ibinc->ii_inc.i_hdr.h_flags == RDS_FLAG_CONG_BITMAP) |
| 711 | rds_ib_cong_recv(conn, ibinc); |
| 712 | else { |
| 713 | rds_recv_incoming(conn, conn->c_faddr, conn->c_laddr, |
| 714 | &ibinc->ii_inc, GFP_ATOMIC, |
| 715 | KM_SOFTIRQ0); |
| 716 | state->ack_next = be64_to_cpu(hdr->h_sequence); |
| 717 | state->ack_next_valid = 1; |
| 718 | } |
| 719 | |
| 720 | /* Evaluate the ACK_REQUIRED flag *after* we received |
| 721 | * the complete frame, and after bumping the next_rx |
| 722 | * sequence. */ |
| 723 | if (hdr->h_flags & RDS_FLAG_ACK_REQUIRED) { |
| 724 | rds_stats_inc(s_recv_ack_required); |
| 725 | state->ack_required = 1; |
| 726 | } |
| 727 | |
| 728 | rds_inc_put(&ibinc->ii_inc); |
| 729 | } |
| 730 | } |
| 731 | |
| 732 | /* |
| 733 | * Plucking the oldest entry from the ring can be done concurrently with |
| 734 | * the thread refilling the ring. Each ring operation is protected by |
| 735 | * spinlocks and the transient state of refilling doesn't change the |
| 736 | * recording of which entry is oldest. |
| 737 | * |
| 738 | * This relies on IB only calling one cq comp_handler for each cq so that |
| 739 | * there will only be one caller of rds_recv_incoming() per RDS connection. |
| 740 | */ |
| 741 | void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context) |
| 742 | { |
| 743 | struct rds_connection *conn = context; |
| 744 | struct rds_ib_connection *ic = conn->c_transport_data; |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 745 | |
| 746 | rdsdebug("conn %p cq %p\n", conn, cq); |
| 747 | |
| 748 | rds_ib_stats_inc(s_ib_rx_cq_call); |
| 749 | |
Andy Grover | d521b63 | 2009-10-30 08:51:57 +0000 | [diff] [blame] | 750 | tasklet_schedule(&ic->i_recv_tasklet); |
| 751 | } |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 752 | |
Andy Grover | d521b63 | 2009-10-30 08:51:57 +0000 | [diff] [blame] | 753 | static inline void rds_poll_cq(struct rds_ib_connection *ic, |
| 754 | struct rds_ib_ack_state *state) |
| 755 | { |
| 756 | struct rds_connection *conn = ic->conn; |
| 757 | struct ib_wc wc; |
| 758 | struct rds_ib_recv_work *recv; |
| 759 | |
| 760 | while (ib_poll_cq(ic->i_recv_cq, 1, &wc) > 0) { |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 761 | rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n", |
| 762 | (unsigned long long)wc.wr_id, wc.status, wc.byte_len, |
| 763 | be32_to_cpu(wc.ex.imm_data)); |
| 764 | rds_ib_stats_inc(s_ib_rx_cq_event); |
| 765 | |
| 766 | recv = &ic->i_recvs[rds_ib_ring_oldest(&ic->i_recv_ring)]; |
| 767 | |
| 768 | rds_ib_recv_unmap_page(ic, recv); |
| 769 | |
| 770 | /* |
| 771 | * Also process recvs in connecting state because it is possible |
| 772 | * to get a recv completion _before_ the rdmacm ESTABLISHED |
| 773 | * event is processed. |
| 774 | */ |
| 775 | if (rds_conn_up(conn) || rds_conn_connecting(conn)) { |
| 776 | /* We expect errors as the qp is drained during shutdown */ |
| 777 | if (wc.status == IB_WC_SUCCESS) { |
Andy Grover | d521b63 | 2009-10-30 08:51:57 +0000 | [diff] [blame] | 778 | rds_ib_process_recv(conn, recv, wc.byte_len, state); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 779 | } else { |
| 780 | rds_ib_conn_error(conn, "recv completion on " |
| 781 | "%pI4 had status %u, disconnecting and " |
| 782 | "reconnecting\n", &conn->c_faddr, |
| 783 | wc.status); |
| 784 | } |
| 785 | } |
| 786 | |
| 787 | rds_ib_ring_free(&ic->i_recv_ring, 1); |
| 788 | } |
Andy Grover | d521b63 | 2009-10-30 08:51:57 +0000 | [diff] [blame] | 789 | } |
| 790 | |
| 791 | void rds_ib_recv_tasklet_fn(unsigned long data) |
| 792 | { |
| 793 | struct rds_ib_connection *ic = (struct rds_ib_connection *) data; |
| 794 | struct rds_connection *conn = ic->conn; |
| 795 | struct rds_ib_ack_state state = { 0, }; |
| 796 | |
| 797 | rds_poll_cq(ic, &state); |
| 798 | ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); |
| 799 | rds_poll_cq(ic, &state); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 800 | |
| 801 | if (state.ack_next_valid) |
| 802 | rds_ib_set_ack(ic, state.ack_next, state.ack_required); |
| 803 | if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) { |
| 804 | rds_send_drop_acked(conn, state.ack_recv, NULL); |
| 805 | ic->i_ack_recv = state.ack_recv; |
| 806 | } |
| 807 | if (rds_conn_up(conn)) |
| 808 | rds_ib_attempt_ack(ic); |
| 809 | |
| 810 | /* If we ever end up with a really empty receive ring, we're |
| 811 | * in deep trouble, as the sender will definitely see RNR |
| 812 | * timeouts. */ |
| 813 | if (rds_ib_ring_empty(&ic->i_recv_ring)) |
| 814 | rds_ib_stats_inc(s_ib_rx_ring_empty); |
| 815 | |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 816 | if (rds_ib_ring_low(&ic->i_recv_ring)) |
Andy Grover | f17a1a5 | 2010-03-18 17:19:52 -0700 | [diff] [blame] | 817 | rds_ib_recv_refill(conn, 0); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 818 | } |
| 819 | |
| 820 | int rds_ib_recv(struct rds_connection *conn) |
| 821 | { |
| 822 | struct rds_ib_connection *ic = conn->c_transport_data; |
| 823 | int ret = 0; |
| 824 | |
| 825 | rdsdebug("conn %p\n", conn); |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 826 | if (rds_conn_up(conn)) |
| 827 | rds_ib_attempt_ack(ic); |
| 828 | |
| 829 | return ret; |
| 830 | } |
| 831 | |
| 832 | int __init rds_ib_recv_init(void) |
| 833 | { |
| 834 | struct sysinfo si; |
| 835 | int ret = -ENOMEM; |
| 836 | |
| 837 | /* Default to 30% of all available RAM for recv memory */ |
| 838 | si_meminfo(&si); |
| 839 | rds_ib_sysctl_max_recv_allocation = si.totalram / 3 * PAGE_SIZE / RDS_FRAG_SIZE; |
| 840 | |
| 841 | rds_ib_incoming_slab = kmem_cache_create("rds_ib_incoming", |
| 842 | sizeof(struct rds_ib_incoming), |
| 843 | 0, 0, NULL); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 844 | if (!rds_ib_incoming_slab) |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 845 | goto out; |
| 846 | |
| 847 | rds_ib_frag_slab = kmem_cache_create("rds_ib_frag", |
| 848 | sizeof(struct rds_page_frag), |
| 849 | 0, 0, NULL); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 850 | if (!rds_ib_frag_slab) |
Andy Grover | 1e23b3e | 2009-02-24 15:30:34 +0000 | [diff] [blame] | 851 | kmem_cache_destroy(rds_ib_incoming_slab); |
| 852 | else |
| 853 | ret = 0; |
| 854 | out: |
| 855 | return ret; |
| 856 | } |
| 857 | |
| 858 | void rds_ib_recv_exit(void) |
| 859 | { |
| 860 | kmem_cache_destroy(rds_ib_incoming_slab); |
| 861 | kmem_cache_destroy(rds_ib_frag_slab); |
| 862 | } |