Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 3 | * Copyright (c) 2009 Red Hat, Inc. |
| 4 | * |
| 5 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 6 | * of this software and associated documentation files (the "Software"), to deal |
| 7 | * in the Software without restriction, including without limitation the rights |
| 8 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 9 | * copies of the Software, and to permit persons to whom the Software is |
| 10 | * furnished to do so, subject to the following conditions: |
| 11 | * |
| 12 | * The above copyright notice and this permission notice shall be included in |
| 13 | * all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 21 | * THE SOFTWARE. |
| 22 | */ |
| 23 | |
Mark McLoughlin | e1144d0 | 2009-10-23 17:52:16 +0100 | [diff] [blame] | 24 | #include "net/queue.h" |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 25 | #include "qemu-queue.h" |
| 26 | |
| 27 | /* The delivery handler may only return zero if it will call |
| 28 | * qemu_net_queue_flush() when it determines that it is once again able |
| 29 | * to deliver packets. It must also call qemu_net_queue_purge() in its |
| 30 | * cleanup path. |
| 31 | * |
| 32 | * If a sent callback is provided to send(), the caller must handle a |
| 33 | * zero return from the delivery handler by not sending any more packets |
| 34 | * until we have invoked the callback. Only in that case will we queue |
| 35 | * the packet. |
| 36 | * |
| 37 | * If a sent callback isn't provided, we just drop the packet to avoid |
| 38 | * unbounded queueing. |
| 39 | */ |
| 40 | |
| 41 | struct NetPacket { |
| 42 | QTAILQ_ENTRY(NetPacket) entry; |
| 43 | VLANClientState *sender; |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 44 | unsigned flags; |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 45 | int size; |
| 46 | NetPacketSent *sent_cb; |
| 47 | uint8_t data[0]; |
| 48 | }; |
| 49 | |
| 50 | struct NetQueue { |
| 51 | NetPacketDeliver *deliver; |
| 52 | NetPacketDeliverIOV *deliver_iov; |
| 53 | void *opaque; |
| 54 | |
| 55 | QTAILQ_HEAD(packets, NetPacket) packets; |
| 56 | |
| 57 | unsigned delivering : 1; |
| 58 | }; |
| 59 | |
| 60 | NetQueue *qemu_new_net_queue(NetPacketDeliver *deliver, |
| 61 | NetPacketDeliverIOV *deliver_iov, |
| 62 | void *opaque) |
| 63 | { |
| 64 | NetQueue *queue; |
| 65 | |
| 66 | queue = qemu_mallocz(sizeof(NetQueue)); |
| 67 | |
| 68 | queue->deliver = deliver; |
| 69 | queue->deliver_iov = deliver_iov; |
| 70 | queue->opaque = opaque; |
| 71 | |
| 72 | QTAILQ_INIT(&queue->packets); |
| 73 | |
| 74 | queue->delivering = 0; |
| 75 | |
| 76 | return queue; |
| 77 | } |
| 78 | |
| 79 | void qemu_del_net_queue(NetQueue *queue) |
| 80 | { |
| 81 | NetPacket *packet, *next; |
| 82 | |
| 83 | QTAILQ_FOREACH_SAFE(packet, &queue->packets, entry, next) { |
| 84 | QTAILQ_REMOVE(&queue->packets, packet, entry); |
| 85 | qemu_free(packet); |
| 86 | } |
| 87 | |
| 88 | qemu_free(queue); |
| 89 | } |
| 90 | |
| 91 | static ssize_t qemu_net_queue_append(NetQueue *queue, |
| 92 | VLANClientState *sender, |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 93 | unsigned flags, |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 94 | const uint8_t *buf, |
| 95 | size_t size, |
| 96 | NetPacketSent *sent_cb) |
| 97 | { |
| 98 | NetPacket *packet; |
| 99 | |
| 100 | packet = qemu_malloc(sizeof(NetPacket) + size); |
| 101 | packet->sender = sender; |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 102 | packet->flags = flags; |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 103 | packet->size = size; |
| 104 | packet->sent_cb = sent_cb; |
| 105 | memcpy(packet->data, buf, size); |
| 106 | |
| 107 | QTAILQ_INSERT_TAIL(&queue->packets, packet, entry); |
| 108 | |
| 109 | return size; |
| 110 | } |
| 111 | |
| 112 | static ssize_t qemu_net_queue_append_iov(NetQueue *queue, |
| 113 | VLANClientState *sender, |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 114 | unsigned flags, |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 115 | const struct iovec *iov, |
| 116 | int iovcnt, |
| 117 | NetPacketSent *sent_cb) |
| 118 | { |
| 119 | NetPacket *packet; |
| 120 | size_t max_len = 0; |
| 121 | int i; |
| 122 | |
| 123 | for (i = 0; i < iovcnt; i++) { |
| 124 | max_len += iov[i].iov_len; |
| 125 | } |
| 126 | |
| 127 | packet = qemu_malloc(sizeof(NetPacket) + max_len); |
| 128 | packet->sender = sender; |
| 129 | packet->sent_cb = sent_cb; |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 130 | packet->flags = flags; |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 131 | packet->size = 0; |
| 132 | |
| 133 | for (i = 0; i < iovcnt; i++) { |
| 134 | size_t len = iov[i].iov_len; |
| 135 | |
| 136 | memcpy(packet->data + packet->size, iov[i].iov_base, len); |
| 137 | packet->size += len; |
| 138 | } |
| 139 | |
| 140 | QTAILQ_INSERT_TAIL(&queue->packets, packet, entry); |
| 141 | |
| 142 | return packet->size; |
| 143 | } |
| 144 | |
| 145 | static ssize_t qemu_net_queue_deliver(NetQueue *queue, |
| 146 | VLANClientState *sender, |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 147 | unsigned flags, |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 148 | const uint8_t *data, |
| 149 | size_t size) |
| 150 | { |
| 151 | ssize_t ret = -1; |
| 152 | |
| 153 | queue->delivering = 1; |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 154 | ret = queue->deliver(sender, flags, data, size, queue->opaque); |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 155 | queue->delivering = 0; |
| 156 | |
| 157 | return ret; |
| 158 | } |
| 159 | |
| 160 | static ssize_t qemu_net_queue_deliver_iov(NetQueue *queue, |
| 161 | VLANClientState *sender, |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 162 | unsigned flags, |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 163 | const struct iovec *iov, |
| 164 | int iovcnt) |
| 165 | { |
| 166 | ssize_t ret = -1; |
| 167 | |
| 168 | queue->delivering = 1; |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 169 | ret = queue->deliver_iov(sender, flags, iov, iovcnt, queue->opaque); |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 170 | queue->delivering = 0; |
| 171 | |
| 172 | return ret; |
| 173 | } |
| 174 | |
| 175 | ssize_t qemu_net_queue_send(NetQueue *queue, |
| 176 | VLANClientState *sender, |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 177 | unsigned flags, |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 178 | const uint8_t *data, |
| 179 | size_t size, |
| 180 | NetPacketSent *sent_cb) |
| 181 | { |
| 182 | ssize_t ret; |
| 183 | |
| 184 | if (queue->delivering) { |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 185 | return qemu_net_queue_append(queue, sender, flags, data, size, NULL); |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 186 | } |
| 187 | |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 188 | ret = qemu_net_queue_deliver(queue, sender, flags, data, size); |
Mark McLoughlin | 839f368 | 2009-10-27 18:16:37 +0000 | [diff] [blame] | 189 | if (ret == 0) { |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 190 | qemu_net_queue_append(queue, sender, flags, data, size, sent_cb); |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | qemu_net_queue_flush(queue); |
| 195 | |
| 196 | return ret; |
| 197 | } |
| 198 | |
| 199 | ssize_t qemu_net_queue_send_iov(NetQueue *queue, |
| 200 | VLANClientState *sender, |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 201 | unsigned flags, |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 202 | const struct iovec *iov, |
| 203 | int iovcnt, |
| 204 | NetPacketSent *sent_cb) |
| 205 | { |
| 206 | ssize_t ret; |
| 207 | |
| 208 | if (queue->delivering) { |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 209 | return qemu_net_queue_append_iov(queue, sender, flags, iov, iovcnt, NULL); |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 210 | } |
| 211 | |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 212 | ret = qemu_net_queue_deliver_iov(queue, sender, flags, iov, iovcnt); |
Mark McLoughlin | 839f368 | 2009-10-27 18:16:37 +0000 | [diff] [blame] | 213 | if (ret == 0) { |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 214 | qemu_net_queue_append_iov(queue, sender, flags, iov, iovcnt, sent_cb); |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | qemu_net_queue_flush(queue); |
| 219 | |
| 220 | return ret; |
| 221 | } |
| 222 | |
| 223 | void qemu_net_queue_purge(NetQueue *queue, VLANClientState *from) |
| 224 | { |
| 225 | NetPacket *packet, *next; |
| 226 | |
| 227 | QTAILQ_FOREACH_SAFE(packet, &queue->packets, entry, next) { |
| 228 | if (packet->sender == from) { |
| 229 | QTAILQ_REMOVE(&queue->packets, packet, entry); |
| 230 | qemu_free(packet); |
| 231 | } |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | void qemu_net_queue_flush(NetQueue *queue) |
| 236 | { |
| 237 | while (!QTAILQ_EMPTY(&queue->packets)) { |
| 238 | NetPacket *packet; |
| 239 | int ret; |
| 240 | |
| 241 | packet = QTAILQ_FIRST(&queue->packets); |
| 242 | QTAILQ_REMOVE(&queue->packets, packet, entry); |
| 243 | |
| 244 | ret = qemu_net_queue_deliver(queue, |
| 245 | packet->sender, |
Mark McLoughlin | c0b8e49 | 2009-10-22 17:43:40 +0100 | [diff] [blame] | 246 | packet->flags, |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 247 | packet->data, |
| 248 | packet->size); |
Mark McLoughlin | 839f368 | 2009-10-27 18:16:37 +0000 | [diff] [blame] | 249 | if (ret == 0) { |
Mark McLoughlin | f710584 | 2009-10-08 19:58:31 +0100 | [diff] [blame] | 250 | QTAILQ_INSERT_HEAD(&queue->packets, packet, entry); |
| 251 | break; |
| 252 | } |
| 253 | |
| 254 | if (packet->sent_cb) { |
| 255 | packet->sent_cb(packet->sender, ret); |
| 256 | } |
| 257 | |
| 258 | qemu_free(packet); |
| 259 | } |
| 260 | } |