Ashwanth Goli | 6de7e09 | 2018-05-09 20:28:24 +0530 | [diff] [blame] | 1 | /* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved. |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | * |
| 12 | * |
| 13 | * RMNET Data virtual network driver |
| 14 | */ |
| 15 | |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/rmnet_data.h> |
| 18 | #include <linux/msm_rmnet.h> |
| 19 | #include <linux/etherdevice.h> |
| 20 | #include <linux/if_arp.h> |
| 21 | #include <linux/spinlock.h> |
| 22 | #include <net/pkt_sched.h> |
| 23 | #include <linux/atomic.h> |
| 24 | #include <linux/net_map.h> |
| 25 | #include "rmnet_data_config.h" |
| 26 | #include "rmnet_data_handlers.h" |
| 27 | #include "rmnet_data_private.h" |
| 28 | #include "rmnet_map.h" |
| 29 | #include "rmnet_data_vnd.h" |
| 30 | #include "rmnet_data_stats.h" |
| 31 | #include "rmnet_data_trace.h" |
| 32 | |
| 33 | RMNET_LOG_MODULE(RMNET_DATA_LOGMASK_VND); |
| 34 | |
| 35 | #define RMNET_MAP_FLOW_NUM_TC_HANDLE 3 |
| 36 | #define RMNET_VND_UF_ACTION_ADD 0 |
| 37 | #define RMNET_VND_UF_ACTION_DEL 1 |
| 38 | enum { |
| 39 | RMNET_VND_UPDATE_FLOW_OK, |
| 40 | RMNET_VND_UPDATE_FLOW_NO_ACTION, |
| 41 | RMNET_VND_UPDATE_FLOW_NO_MORE_ROOM, |
| 42 | RMNET_VND_UPDATE_FLOW_NO_VALID_LEFT |
| 43 | }; |
| 44 | |
| 45 | struct net_device *rmnet_devices[RMNET_DATA_MAX_VND]; |
| 46 | |
| 47 | struct rmnet_map_flow_mapping_s { |
| 48 | struct list_head list; |
| 49 | u32 map_flow_id; |
| 50 | u32 tc_flow_valid[RMNET_MAP_FLOW_NUM_TC_HANDLE]; |
| 51 | u32 tc_flow_id[RMNET_MAP_FLOW_NUM_TC_HANDLE]; |
| 52 | atomic_t v4_seq; |
| 53 | atomic_t v6_seq; |
| 54 | }; |
| 55 | |
| 56 | struct rmnet_vnd_private_s { |
| 57 | u32 qos_version; |
| 58 | struct rmnet_logical_ep_conf_s local_ep; |
| 59 | |
| 60 | rwlock_t flow_map_lock; |
| 61 | struct list_head flow_head; |
| 62 | struct rmnet_map_flow_mapping_s root_flow; |
| 63 | }; |
| 64 | |
| 65 | #define RMNET_VND_FC_QUEUED 0 |
| 66 | #define RMNET_VND_FC_NOT_ENABLED 1 |
| 67 | #define RMNET_VND_FC_KMALLOC_ERR 2 |
| 68 | |
| 69 | /* Helper Functions */ |
| 70 | |
| 71 | /* rmnet_vnd_add_qos_header() - Adds QoS header to front of skb->data |
| 72 | * @skb: Socket buffer ("packet") to modify |
| 73 | * @dev: Egress interface |
| 74 | * |
| 75 | * Does not check for sufficient headroom! Caller must make sure there is enough |
| 76 | * headroom. |
| 77 | */ |
| 78 | static void rmnet_vnd_add_qos_header(struct sk_buff *skb, |
| 79 | struct net_device *dev, |
| 80 | uint32_t qos_version) |
| 81 | { |
| 82 | struct QMI_QOS_HDR_S *qmih; |
| 83 | struct qmi_qos_hdr8_s *qmi8h; |
| 84 | |
| 85 | if (qos_version & RMNET_IOCTL_QOS_MODE_6) { |
| 86 | qmih = (struct QMI_QOS_HDR_S *) |
| 87 | skb_push(skb, sizeof(struct QMI_QOS_HDR_S)); |
| 88 | qmih->version = 1; |
| 89 | qmih->flags = 0; |
| 90 | qmih->flow_id = skb->mark; |
| 91 | } else if (qos_version & RMNET_IOCTL_QOS_MODE_8) { |
| 92 | qmi8h = (struct qmi_qos_hdr8_s *) |
| 93 | skb_push(skb, sizeof(struct qmi_qos_hdr8_s)); |
| 94 | /* Flags are 0 always */ |
| 95 | qmi8h->hdr.version = 0; |
| 96 | qmi8h->hdr.flags = 0; |
| 97 | memset(qmi8h->reserved, 0, sizeof(qmi8h->reserved)); |
| 98 | qmi8h->hdr.flow_id = skb->mark; |
| 99 | } else { |
| 100 | LOGD("%s(): Bad QoS version configured\n", __func__); |
| 101 | } |
| 102 | } |
| 103 | |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 104 | /* Network Device Operations */ |
| 105 | |
| 106 | /* rmnet_vnd_start_xmit() - Transmit NDO callback |
| 107 | * @skb: Socket buffer ("packet") being sent from network stack |
| 108 | * @dev: Virtual Network Device |
| 109 | * |
| 110 | * Standard network driver operations hook to transmit packets on virtual |
| 111 | * network device. Called by network stack. Packet is not transmitted directly |
| 112 | * from here; instead it is given to the rmnet egress handler. |
| 113 | * |
| 114 | * Return: |
| 115 | * - NETDEV_TX_OK under all cirumstances (cannot block/fail) |
| 116 | */ |
| 117 | static netdev_tx_t rmnet_vnd_start_xmit(struct sk_buff *skb, |
| 118 | struct net_device *dev) |
| 119 | { |
| 120 | struct rmnet_vnd_private_s *dev_conf; |
| 121 | |
| 122 | trace_rmnet_vnd_start_xmit(skb); |
| 123 | dev_conf = (struct rmnet_vnd_private_s *)netdev_priv(dev); |
| 124 | if (dev_conf->local_ep.egress_dev) { |
| 125 | /* QoS header should come after MAP header */ |
| 126 | if (dev_conf->qos_version) |
| 127 | rmnet_vnd_add_qos_header(skb, |
| 128 | dev, |
| 129 | dev_conf->qos_version); |
Subash Abhinov Kasiviswanathan | 6a2d1dd | 2016-11-14 12:40:34 -0700 | [diff] [blame] | 130 | skb_orphan(skb); |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 131 | rmnet_egress_handler(skb, &dev_conf->local_ep); |
| 132 | } else { |
| 133 | dev->stats.tx_dropped++; |
| 134 | rmnet_kfree_skb(skb, RMNET_STATS_SKBFREE_VND_NO_EGRESS); |
| 135 | } |
| 136 | return NETDEV_TX_OK; |
| 137 | } |
| 138 | |
| 139 | /* rmnet_vnd_change_mtu() - Change MTU NDO callback |
| 140 | * @dev: Virtual network device |
| 141 | * @new_mtu: New MTU value to set (in bytes) |
| 142 | * |
| 143 | * Standard network driver operations hook to set the MTU. Called by kernel to |
| 144 | * set the device MTU. Checks if desired MTU is less than zero or greater than |
| 145 | * RMNET_DATA_MAX_PACKET_SIZE; |
| 146 | * |
| 147 | * Return: |
| 148 | * - 0 if successful |
| 149 | * - -EINVAL if new_mtu is out of range |
| 150 | */ |
| 151 | static int rmnet_vnd_change_mtu(struct net_device *dev, int new_mtu) |
| 152 | { |
| 153 | if (new_mtu < 0 || new_mtu > RMNET_DATA_MAX_PACKET_SIZE) |
| 154 | return -EINVAL; |
| 155 | |
| 156 | dev->mtu = new_mtu; |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | #ifdef CONFIG_RMNET_DATA_FC |
| 161 | static int _rmnet_vnd_do_qos_ioctl(struct net_device *dev, |
| 162 | struct ifreq *ifr, |
| 163 | int cmd) |
| 164 | { |
| 165 | struct rmnet_vnd_private_s *dev_conf; |
| 166 | int rc, qdisc_len = 0; |
| 167 | struct rmnet_ioctl_data_s ioctl_data; |
| 168 | |
| 169 | rc = 0; |
| 170 | dev_conf = (struct rmnet_vnd_private_s *)netdev_priv(dev); |
| 171 | |
| 172 | switch (cmd) { |
| 173 | case RMNET_IOCTL_SET_QOS_ENABLE: |
Subash Abhinov Kasiviswanathan | 29e6452 | 2017-09-05 19:33:59 -0600 | [diff] [blame] | 174 | if (!capable(CAP_NET_ADMIN)) |
| 175 | return -EPERM; |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 176 | LOGM("RMNET_IOCTL_SET_QOS_ENABLE on %s", dev->name); |
| 177 | if (!dev_conf->qos_version) |
| 178 | dev_conf->qos_version = RMNET_IOCTL_QOS_MODE_6; |
| 179 | break; |
| 180 | |
| 181 | case RMNET_IOCTL_SET_QOS_DISABLE: |
Subash Abhinov Kasiviswanathan | 29e6452 | 2017-09-05 19:33:59 -0600 | [diff] [blame] | 182 | if (!capable(CAP_NET_ADMIN)) |
| 183 | return -EPERM; |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 184 | LOGM("RMNET_IOCTL_SET_QOS_DISABLE on %s", dev->name); |
| 185 | dev_conf->qos_version = 0; |
| 186 | break; |
| 187 | |
| 188 | case RMNET_IOCTL_GET_QOS: /* Get QoS header state */ |
| 189 | LOGM("RMNET_IOCTL_GET_QOS on %s", dev->name); |
| 190 | ioctl_data.u.operation_mode = (dev_conf->qos_version == |
| 191 | RMNET_IOCTL_QOS_MODE_6); |
| 192 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ioctl_data, |
| 193 | sizeof(struct rmnet_ioctl_data_s))) |
| 194 | rc = -EFAULT; |
| 195 | break; |
| 196 | |
| 197 | case RMNET_IOCTL_FLOW_ENABLE: |
Subash Abhinov Kasiviswanathan | 29e6452 | 2017-09-05 19:33:59 -0600 | [diff] [blame] | 198 | if (!capable(CAP_NET_ADMIN)) |
| 199 | return -EPERM; |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 200 | LOGL("RMNET_IOCTL_FLOW_ENABLE on %s", dev->name); |
| 201 | if (copy_from_user(&ioctl_data, ifr->ifr_ifru.ifru_data, |
| 202 | sizeof(struct rmnet_ioctl_data_s))) { |
| 203 | rc = -EFAULT; |
| 204 | break; |
| 205 | } |
| 206 | qdisc_len = tc_qdisc_flow_control(dev, |
| 207 | ioctl_data.u.tcm_handle, 1); |
| 208 | trace_rmnet_fc_qmi(ioctl_data.u.tcm_handle, qdisc_len, 1); |
| 209 | break; |
| 210 | |
| 211 | case RMNET_IOCTL_FLOW_DISABLE: |
Subash Abhinov Kasiviswanathan | 29e6452 | 2017-09-05 19:33:59 -0600 | [diff] [blame] | 212 | if (!capable(CAP_NET_ADMIN)) |
| 213 | return -EPERM; |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 214 | LOGL("RMNET_IOCTL_FLOW_DISABLE on %s", dev->name); |
| 215 | if (copy_from_user(&ioctl_data, ifr->ifr_ifru.ifru_data, |
| 216 | sizeof(struct rmnet_ioctl_data_s))) { |
| 217 | rc = -EFAULT; |
| 218 | break; |
| 219 | } |
| 220 | qdisc_len = tc_qdisc_flow_control(dev, |
| 221 | ioctl_data.u.tcm_handle, 0); |
| 222 | trace_rmnet_fc_qmi(ioctl_data.u.tcm_handle, qdisc_len, 0); |
| 223 | break; |
| 224 | |
| 225 | default: |
| 226 | rc = -EINVAL; |
| 227 | } |
| 228 | |
| 229 | return rc; |
| 230 | } |
| 231 | |
| 232 | struct rmnet_vnd_fc_work { |
| 233 | struct work_struct work; |
| 234 | struct net_device *dev; |
| 235 | u32 tc_handle; |
| 236 | int enable; |
| 237 | }; |
| 238 | |
| 239 | static void _rmnet_vnd_wq_flow_control(struct work_struct *work) |
| 240 | { |
| 241 | struct rmnet_vnd_fc_work *fcwork; |
| 242 | int qdisc_len = 0; |
| 243 | |
| 244 | fcwork = (struct rmnet_vnd_fc_work *)work; |
| 245 | |
| 246 | rtnl_lock(); |
| 247 | qdisc_len = tc_qdisc_flow_control(fcwork->dev, fcwork->tc_handle, |
| 248 | fcwork->enable); |
| 249 | trace_rmnet_fc_map(fcwork->tc_handle, qdisc_len, fcwork->enable); |
| 250 | rtnl_unlock(); |
| 251 | |
| 252 | LOGL("[%s] handle:%08X enable:%d", |
| 253 | fcwork->dev->name, fcwork->tc_handle, fcwork->enable); |
| 254 | |
| 255 | kfree(work); |
| 256 | } |
| 257 | |
| 258 | static int _rmnet_vnd_do_flow_control(struct net_device *dev, |
| 259 | u32 tc_handle, |
| 260 | int enable) |
| 261 | { |
| 262 | struct rmnet_vnd_fc_work *fcwork; |
| 263 | |
| 264 | fcwork = kmalloc(sizeof(*fcwork), GFP_ATOMIC); |
| 265 | if (!fcwork) |
| 266 | return RMNET_VND_FC_KMALLOC_ERR; |
| 267 | memset(fcwork, 0, sizeof(struct rmnet_vnd_fc_work)); |
| 268 | |
| 269 | INIT_WORK((struct work_struct *)fcwork, _rmnet_vnd_wq_flow_control); |
| 270 | fcwork->dev = dev; |
| 271 | fcwork->tc_handle = tc_handle; |
| 272 | fcwork->enable = enable; |
| 273 | |
| 274 | schedule_work((struct work_struct *)fcwork); |
| 275 | return RMNET_VND_FC_QUEUED; |
| 276 | } |
| 277 | #else |
| 278 | static int _rmnet_vnd_do_qos_ioctl(struct net_device *dev, |
| 279 | struct ifreq *ifr, |
| 280 | int cmd) |
| 281 | { |
| 282 | return -EINVAL; |
| 283 | } |
| 284 | |
| 285 | static inline int _rmnet_vnd_do_flow_control(struct net_device *dev, |
| 286 | u32 tc_handle, |
| 287 | int enable) |
| 288 | { |
| 289 | LOGD("[%s] called with no QoS support", dev->name); |
| 290 | return RMNET_VND_FC_NOT_ENABLED; |
| 291 | } |
| 292 | #endif /* CONFIG_RMNET_DATA_FC */ |
| 293 | |
| 294 | static int rmnet_vnd_ioctl_extended(struct net_device *dev, struct ifreq *ifr) |
| 295 | { |
| 296 | struct rmnet_vnd_private_s *dev_conf; |
| 297 | struct rmnet_ioctl_extended_s ext_cmd; |
| 298 | int rc = 0; |
| 299 | |
| 300 | dev_conf = (struct rmnet_vnd_private_s *)netdev_priv(dev); |
| 301 | |
| 302 | rc = copy_from_user(&ext_cmd, ifr->ifr_ifru.ifru_data, |
| 303 | sizeof(struct rmnet_ioctl_extended_s)); |
| 304 | if (rc) { |
| 305 | LOGM("%s(): copy_from_user() failed\n", __func__); |
| 306 | return rc; |
| 307 | } |
| 308 | |
| 309 | switch (ext_cmd.extended_ioctl) { |
| 310 | case RMNET_IOCTL_GET_SUPPORTED_FEATURES: |
| 311 | ext_cmd.u.data = 0; |
| 312 | break; |
| 313 | |
| 314 | case RMNET_IOCTL_GET_DRIVER_NAME: |
| 315 | strlcpy(ext_cmd.u.if_name, "rmnet_data", |
| 316 | sizeof(ext_cmd.u.if_name)); |
| 317 | break; |
| 318 | |
| 319 | case RMNET_IOCTL_GET_SUPPORTED_QOS_MODES: |
| 320 | ext_cmd.u.data = RMNET_IOCTL_QOS_MODE_6 |
| 321 | | RMNET_IOCTL_QOS_MODE_8; |
| 322 | break; |
| 323 | |
| 324 | case RMNET_IOCTL_GET_QOS_VERSION: |
| 325 | ext_cmd.u.data = dev_conf->qos_version; |
| 326 | break; |
| 327 | |
| 328 | case RMNET_IOCTL_SET_QOS_VERSION: |
Subash Abhinov Kasiviswanathan | 29e6452 | 2017-09-05 19:33:59 -0600 | [diff] [blame] | 329 | if (!capable(CAP_NET_ADMIN)) |
| 330 | return -EPERM; |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 331 | if (ext_cmd.u.data == RMNET_IOCTL_QOS_MODE_6 || |
| 332 | ext_cmd.u.data == RMNET_IOCTL_QOS_MODE_8 || |
| 333 | ext_cmd.u.data == 0) { |
| 334 | dev_conf->qos_version = ext_cmd.u.data; |
| 335 | } else { |
| 336 | rc = -EINVAL; |
| 337 | goto done; |
| 338 | } |
| 339 | break; |
| 340 | |
| 341 | default: |
| 342 | rc = -EINVAL; |
| 343 | goto done; |
| 344 | } |
| 345 | |
| 346 | rc = copy_to_user(ifr->ifr_ifru.ifru_data, &ext_cmd, |
| 347 | sizeof(struct rmnet_ioctl_extended_s)); |
| 348 | if (rc) |
| 349 | LOGM("%s(): copy_to_user() failed\n", __func__); |
| 350 | |
| 351 | done: |
| 352 | return rc; |
| 353 | } |
| 354 | |
| 355 | /* rmnet_vnd_ioctl() - IOCTL NDO callback |
| 356 | * @dev: Virtual network device |
| 357 | * @ifreq: User data |
| 358 | * @cmd: IOCTL command value |
| 359 | * |
| 360 | * Standard network driver operations hook to process IOCTLs. Called by kernel |
| 361 | * to process non-stanard IOCTLs for device |
| 362 | * |
| 363 | * Return: |
| 364 | * - 0 if successful |
| 365 | * - -EINVAL if unknown IOCTL |
| 366 | */ |
| 367 | static int rmnet_vnd_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
| 368 | { |
| 369 | struct rmnet_vnd_private_s *dev_conf; |
| 370 | int rc; |
| 371 | struct rmnet_ioctl_data_s ioctl_data; |
| 372 | |
| 373 | rc = 0; |
| 374 | dev_conf = (struct rmnet_vnd_private_s *)netdev_priv(dev); |
| 375 | |
| 376 | rc = _rmnet_vnd_do_qos_ioctl(dev, ifr, cmd); |
| 377 | if (rc != -EINVAL) |
| 378 | return rc; |
| 379 | rc = 0; /* Reset rc as it may contain -EINVAL from above */ |
| 380 | |
| 381 | switch (cmd) { |
| 382 | case RMNET_IOCTL_OPEN: /* Do nothing. Support legacy behavior */ |
| 383 | LOGM("RMNET_IOCTL_OPEN on %s (ignored)", dev->name); |
| 384 | break; |
| 385 | |
| 386 | case RMNET_IOCTL_CLOSE: /* Do nothing. Support legacy behavior */ |
| 387 | LOGM("RMNET_IOCTL_CLOSE on %s (ignored)", dev->name); |
| 388 | break; |
| 389 | |
| 390 | case RMNET_IOCTL_SET_LLP_ETHERNET: |
| 391 | LOGM("RMNET_IOCTL_SET_LLP_ETHERNET on %s (no support)", |
| 392 | dev->name); |
| 393 | rc = -EINVAL; |
| 394 | break; |
| 395 | |
| 396 | case RMNET_IOCTL_SET_LLP_IP: /* Do nothing. Support legacy behavior */ |
| 397 | LOGM("RMNET_IOCTL_SET_LLP_IP on %s (ignored)", dev->name); |
| 398 | break; |
| 399 | |
| 400 | case RMNET_IOCTL_GET_LLP: /* Always return IP mode */ |
| 401 | LOGM("RMNET_IOCTL_GET_LLP on %s", dev->name); |
| 402 | ioctl_data.u.operation_mode = RMNET_MODE_LLP_IP; |
| 403 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ioctl_data, |
| 404 | sizeof(struct rmnet_ioctl_data_s))) |
| 405 | rc = -EFAULT; |
| 406 | break; |
| 407 | |
| 408 | case RMNET_IOCTL_EXTENDED: |
| 409 | rc = rmnet_vnd_ioctl_extended(dev, ifr); |
| 410 | break; |
| 411 | |
| 412 | default: |
| 413 | LOGM("Unknown IOCTL 0x%08X", cmd); |
| 414 | rc = -EINVAL; |
| 415 | } |
| 416 | |
| 417 | return rc; |
| 418 | } |
| 419 | |
| 420 | static const struct net_device_ops rmnet_data_vnd_ops = { |
| 421 | .ndo_init = 0, |
| 422 | .ndo_start_xmit = rmnet_vnd_start_xmit, |
| 423 | .ndo_do_ioctl = rmnet_vnd_ioctl, |
| 424 | .ndo_change_mtu = rmnet_vnd_change_mtu, |
| 425 | .ndo_set_mac_address = 0, |
| 426 | .ndo_validate_addr = 0, |
| 427 | }; |
| 428 | |
| 429 | /* rmnet_vnd_setup() - net_device initialization callback |
| 430 | * @dev: Virtual network device |
| 431 | * |
| 432 | * Called by kernel whenever a new rmnet_data<n> device is created. Sets MTU, |
| 433 | * flags, ARP type, needed headroom, etc... |
| 434 | */ |
| 435 | static void rmnet_vnd_setup(struct net_device *dev) |
| 436 | { |
| 437 | struct rmnet_vnd_private_s *dev_conf; |
| 438 | |
| 439 | LOGM("Setting up device %s", dev->name); |
| 440 | |
| 441 | /* Clear out private data */ |
| 442 | dev_conf = (struct rmnet_vnd_private_s *)netdev_priv(dev); |
| 443 | memset(dev_conf, 0, sizeof(struct rmnet_vnd_private_s)); |
| 444 | |
| 445 | dev->netdev_ops = &rmnet_data_vnd_ops; |
| 446 | dev->mtu = RMNET_DATA_DFLT_PACKET_SIZE; |
| 447 | dev->needed_headroom = RMNET_DATA_NEEDED_HEADROOM; |
| 448 | random_ether_addr(dev->dev_addr); |
| 449 | dev->tx_queue_len = RMNET_DATA_TX_QUEUE_LEN; |
| 450 | |
| 451 | /* Raw IP mode */ |
| 452 | dev->header_ops = 0; /* No header */ |
| 453 | dev->type = ARPHRD_RAWIP; |
| 454 | dev->hard_header_len = 0; |
| 455 | dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST); |
| 456 | |
| 457 | /* Flow control */ |
| 458 | rwlock_init(&dev_conf->flow_map_lock); |
| 459 | INIT_LIST_HEAD(&dev_conf->flow_head); |
| 460 | } |
| 461 | |
Subash Abhinov Kasiviswanathan | 5d8d66c | 2016-12-05 12:26:41 -0700 | [diff] [blame] | 462 | /* rmnet_vnd_setup() - net_device initialization helper function |
| 463 | * @dev: Virtual network device |
| 464 | * |
| 465 | * Called during device initialization. Disables GRO. |
| 466 | */ |
| 467 | static void rmnet_vnd_disable_offload(struct net_device *dev) |
| 468 | { |
| 469 | dev->wanted_features &= ~NETIF_F_GRO; |
| 470 | __netdev_update_features(dev); |
| 471 | } |
| 472 | |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 473 | /* Exposed API */ |
| 474 | |
| 475 | /* rmnet_vnd_exit() - Shutdown cleanup hook |
| 476 | * |
| 477 | * Called by RmNet main on module unload. Cleans up data structures and |
| 478 | * unregisters/frees net_devices. |
| 479 | */ |
| 480 | void rmnet_vnd_exit(void) |
| 481 | { |
| 482 | int i; |
| 483 | |
| 484 | for (i = 0; i < RMNET_DATA_MAX_VND; i++) |
| 485 | if (rmnet_devices[i]) { |
| 486 | unregister_netdev(rmnet_devices[i]); |
| 487 | free_netdev(rmnet_devices[i]); |
| 488 | } |
| 489 | } |
| 490 | |
| 491 | /* rmnet_vnd_init() - Init hook |
| 492 | * |
| 493 | * Called by RmNet main on module load. Initializes data structures |
| 494 | */ |
| 495 | int rmnet_vnd_init(void) |
| 496 | { |
| 497 | memset(rmnet_devices, 0, |
| 498 | sizeof(struct net_device *) * RMNET_DATA_MAX_VND); |
| 499 | return 0; |
| 500 | } |
| 501 | |
| 502 | /* rmnet_vnd_create_dev() - Create a new virtual network device node. |
| 503 | * @id: Virtual device node id |
| 504 | * @new_device: Pointer to newly created device node |
| 505 | * @prefix: Device name prefix |
| 506 | * |
| 507 | * Allocates structures for new virtual network devices. Sets the name of the |
| 508 | * new device and registers it with the network stack. Device will appear in |
| 509 | * ifconfig list after this is called. If the prefix is null, then |
| 510 | * RMNET_DATA_DEV_NAME_STR will be assumed. |
| 511 | * |
| 512 | * Return: |
| 513 | * - 0 if successful |
| 514 | * - RMNET_CONFIG_BAD_ARGUMENTS if id is out of range or prefix is too long |
| 515 | * - RMNET_CONFIG_DEVICE_IN_USE if id already in use |
| 516 | * - RMNET_CONFIG_NOMEM if net_device allocation failed |
| 517 | * - RMNET_CONFIG_UNKNOWN_ERROR if register_netdevice() fails |
| 518 | */ |
| 519 | int rmnet_vnd_create_dev(int id, struct net_device **new_device, |
Subash Abhinov Kasiviswanathan | 5859863 | 2017-02-23 18:24:42 -0700 | [diff] [blame] | 520 | const char *prefix, int use_name) |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 521 | { |
| 522 | struct net_device *dev; |
| 523 | char dev_prefix[IFNAMSIZ]; |
| 524 | int p, rc = 0; |
| 525 | |
| 526 | if (id < 0 || id >= RMNET_DATA_MAX_VND) { |
| 527 | *new_device = 0; |
| 528 | return RMNET_CONFIG_BAD_ARGUMENTS; |
| 529 | } |
| 530 | |
| 531 | if (rmnet_devices[id] != 0) { |
| 532 | *new_device = 0; |
| 533 | return RMNET_CONFIG_DEVICE_IN_USE; |
| 534 | } |
| 535 | |
Subash Abhinov Kasiviswanathan | 5859863 | 2017-02-23 18:24:42 -0700 | [diff] [blame] | 536 | if (!prefix && !use_name) |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 537 | p = scnprintf(dev_prefix, IFNAMSIZ, "%s%%d", |
| 538 | RMNET_DATA_DEV_NAME_STR); |
Subash Abhinov Kasiviswanathan | 5859863 | 2017-02-23 18:24:42 -0700 | [diff] [blame] | 539 | else if (prefix && use_name) |
| 540 | p = scnprintf(dev_prefix, IFNAMSIZ, "%s", prefix); |
| 541 | else if (prefix && !use_name) |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 542 | p = scnprintf(dev_prefix, IFNAMSIZ, "%s%%d", prefix); |
Subash Abhinov Kasiviswanathan | 5859863 | 2017-02-23 18:24:42 -0700 | [diff] [blame] | 543 | else |
| 544 | return RMNET_CONFIG_BAD_ARGUMENTS; |
| 545 | |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 546 | if (p >= (IFNAMSIZ - 1)) { |
| 547 | LOGE("Specified prefix longer than IFNAMSIZ"); |
| 548 | return RMNET_CONFIG_BAD_ARGUMENTS; |
| 549 | } |
| 550 | |
| 551 | dev = alloc_netdev(sizeof(struct rmnet_vnd_private_s), |
| 552 | dev_prefix, |
Subash Abhinov Kasiviswanathan | 5859863 | 2017-02-23 18:24:42 -0700 | [diff] [blame] | 553 | use_name ? NET_NAME_UNKNOWN : NET_NAME_ENUM, |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 554 | rmnet_vnd_setup); |
| 555 | if (!dev) { |
| 556 | LOGE("Failed to to allocate netdev for id %d", id); |
| 557 | *new_device = 0; |
| 558 | return RMNET_CONFIG_NOMEM; |
| 559 | } |
| 560 | |
| 561 | if (!prefix) { |
| 562 | /* Configuring DL checksum offload on rmnet_data interfaces */ |
| 563 | dev->hw_features = NETIF_F_RXCSUM; |
| 564 | /* Configuring UL checksum offload on rmnet_data interfaces */ |
| 565 | dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; |
| 566 | /* Configuring GRO on rmnet_data interfaces */ |
| 567 | dev->hw_features |= NETIF_F_GRO; |
| 568 | /* Configuring Scatter-Gather on rmnet_data interfaces */ |
| 569 | dev->hw_features |= NETIF_F_SG; |
| 570 | /* Configuring GSO on rmnet_data interfaces */ |
| 571 | dev->hw_features |= NETIF_F_GSO; |
| 572 | dev->hw_features |= NETIF_F_GSO_UDP_TUNNEL; |
| 573 | dev->hw_features |= NETIF_F_GSO_UDP_TUNNEL_CSUM; |
| 574 | } |
| 575 | |
| 576 | rc = register_netdevice(dev); |
| 577 | if (rc != 0) { |
| 578 | LOGE("Failed to to register netdev [%s]", dev->name); |
| 579 | free_netdev(dev); |
| 580 | *new_device = 0; |
Ashwanth Goli | 6de7e09 | 2018-05-09 20:28:24 +0530 | [diff] [blame] | 581 | return RMNET_CONFIG_UNKNOWN_ERROR; |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 582 | } else { |
| 583 | rmnet_devices[id] = dev; |
| 584 | *new_device = dev; |
| 585 | LOGM("Registered device %s", dev->name); |
| 586 | } |
| 587 | |
Subash Abhinov Kasiviswanathan | 5d8d66c | 2016-12-05 12:26:41 -0700 | [diff] [blame] | 588 | rmnet_vnd_disable_offload(dev); |
| 589 | |
Subash Abhinov Kasiviswanathan | 2139ce8a | 2016-10-14 11:01:48 -0600 | [diff] [blame] | 590 | return rc; |
| 591 | } |
| 592 | |
| 593 | /* rmnet_vnd_free_dev() - free a virtual network device node. |
| 594 | * @id: Virtual device node id |
| 595 | * |
| 596 | * Unregisters the virtual network device node and frees it. |
| 597 | * unregister_netdev locks the rtnl mutex, so the mutex must not be locked |
| 598 | * by the caller of the function. unregister_netdev enqueues the request to |
| 599 | * unregister the device into a TODO queue. The requests in the TODO queue |
| 600 | * are only done after rtnl mutex is unlocked, therefore free_netdev has to |
| 601 | * called after unlocking rtnl mutex. |
| 602 | * |
| 603 | * Return: |
| 604 | * - 0 if successful |
| 605 | * - RMNET_CONFIG_NO_SUCH_DEVICE if id is invalid or not in range |
| 606 | * - RMNET_CONFIG_DEVICE_IN_USE if device has logical ep that wasn't unset |
| 607 | */ |
| 608 | int rmnet_vnd_free_dev(int id) |
| 609 | { |
| 610 | struct rmnet_logical_ep_conf_s *epconfig_l; |
| 611 | struct net_device *dev; |
| 612 | |
| 613 | rtnl_lock(); |
| 614 | if ((id < 0) || (id >= RMNET_DATA_MAX_VND) || !rmnet_devices[id]) { |
| 615 | rtnl_unlock(); |
| 616 | LOGM("Invalid id [%d]", id); |
| 617 | return RMNET_CONFIG_NO_SUCH_DEVICE; |
| 618 | } |
| 619 | |
| 620 | epconfig_l = rmnet_vnd_get_le_config(rmnet_devices[id]); |
| 621 | if (epconfig_l && epconfig_l->refcount) { |
| 622 | rtnl_unlock(); |
| 623 | return RMNET_CONFIG_DEVICE_IN_USE; |
| 624 | } |
| 625 | |
| 626 | dev = rmnet_devices[id]; |
| 627 | rmnet_devices[id] = 0; |
| 628 | rtnl_unlock(); |
| 629 | |
| 630 | if (dev) { |
| 631 | unregister_netdev(dev); |
| 632 | free_netdev(dev); |
| 633 | return 0; |
| 634 | } else { |
| 635 | return RMNET_CONFIG_NO_SUCH_DEVICE; |
| 636 | } |
| 637 | } |
| 638 | |
| 639 | /* rmnet_vnd_get_name() - Gets the string name of a VND based on ID |
| 640 | * @id: Virtual device node id |
| 641 | * @name: Buffer to store name of virtual device node |
| 642 | * @name_len: Length of name buffer |
| 643 | * |
| 644 | * Copies the name of the virtual device node into the users buffer. Will throw |
| 645 | * an error if the buffer is null, or too small to hold the device name. |
| 646 | * |
| 647 | * Return: |
| 648 | * - 0 if successful |
| 649 | * - -EINVAL if name is null |
| 650 | * - -EINVAL if id is invalid or not in range |
| 651 | * - -EINVAL if name is too small to hold things |
| 652 | */ |
| 653 | int rmnet_vnd_get_name(int id, char *name, int name_len) |
| 654 | { |
| 655 | int p; |
| 656 | |
| 657 | if (!name) { |
| 658 | LOGM("%s", "Bad arguments; name buffer null"); |
| 659 | return -EINVAL; |
| 660 | } |
| 661 | |
| 662 | if ((id < 0) || (id >= RMNET_DATA_MAX_VND) || !rmnet_devices[id]) { |
| 663 | LOGM("Invalid id [%d]", id); |
| 664 | return -EINVAL; |
| 665 | } |
| 666 | |
| 667 | p = strlcpy(name, rmnet_devices[id]->name, name_len); |
| 668 | if (p >= name_len) { |
| 669 | LOGM("Buffer to small (%d) to fit device name", name_len); |
| 670 | return -EINVAL; |
| 671 | } |
| 672 | LOGL("Found mapping [%d]->\"%s\"", id, name); |
| 673 | |
| 674 | return 0; |
| 675 | } |
| 676 | |
| 677 | /* rmnet_vnd_is_vnd() - Determine if net_device is RmNet owned virtual devices |
| 678 | * @dev: Network device to test |
| 679 | * |
| 680 | * Searches through list of known RmNet virtual devices. This function is O(n) |
| 681 | * and should not be used in the data path. |
| 682 | * |
| 683 | * Return: |
| 684 | * - 0 if device is not RmNet virtual device |
| 685 | * - 1 if device is RmNet virtual device |
| 686 | */ |
| 687 | int rmnet_vnd_is_vnd(struct net_device *dev) |
| 688 | { |
| 689 | /* This is not an efficient search, but, this will only be called in |
| 690 | * a configuration context, and the list is small. |
| 691 | */ |
| 692 | int i; |
| 693 | |
| 694 | if (!dev) |
| 695 | return 0; |
| 696 | |
| 697 | for (i = 0; i < RMNET_DATA_MAX_VND; i++) |
| 698 | if (dev == rmnet_devices[i]) |
| 699 | return i + 1; |
| 700 | |
| 701 | return 0; |
| 702 | } |
| 703 | |
| 704 | /* rmnet_vnd_get_le_config() - Get the logical endpoint configuration |
| 705 | * @dev: Virtual device node |
| 706 | * |
| 707 | * Gets the logical endpoint configuration for a RmNet virtual network device |
| 708 | * node. Caller should confirm that devices is a RmNet VND before calling. |
| 709 | * |
| 710 | * Return: |
| 711 | * - Pointer to logical endpoint configuration structure |
| 712 | * - 0 (null) if dev is null |
| 713 | */ |
| 714 | struct rmnet_logical_ep_conf_s *rmnet_vnd_get_le_config(struct net_device *dev) |
| 715 | { |
| 716 | struct rmnet_vnd_private_s *dev_conf; |
| 717 | |
| 718 | if (!dev) |
| 719 | return 0; |
| 720 | |
| 721 | dev_conf = (struct rmnet_vnd_private_s *)netdev_priv(dev); |
| 722 | if (!dev_conf) |
| 723 | return 0; |
| 724 | |
| 725 | return &dev_conf->local_ep; |
| 726 | } |
| 727 | |
| 728 | /* _rmnet_vnd_get_flow_map() - Gets object representing a MAP flow handle |
| 729 | * @dev_conf: Private configuration structure for virtual network device |
| 730 | * @map_flow: MAP flow handle IF |
| 731 | * |
| 732 | * Loops through available flow mappings and compares the MAP flow handle. |
| 733 | * Returns when mapping is found. |
| 734 | * |
| 735 | * Return: |
| 736 | * - Null if no mapping was found |
| 737 | * - Pointer to mapping otherwise |
| 738 | */ |
| 739 | static struct rmnet_map_flow_mapping_s *_rmnet_vnd_get_flow_map |
| 740 | (struct rmnet_vnd_private_s *dev_conf, |
| 741 | u32 map_flow) |
| 742 | { |
| 743 | struct list_head *p; |
| 744 | struct rmnet_map_flow_mapping_s *itm; |
| 745 | |
| 746 | list_for_each(p, &dev_conf->flow_head) { |
| 747 | itm = list_entry(p, struct rmnet_map_flow_mapping_s, list); |
| 748 | |
| 749 | if (unlikely(!itm)) |
| 750 | return 0; |
| 751 | |
| 752 | if (itm->map_flow_id == map_flow) |
| 753 | return itm; |
| 754 | } |
| 755 | return 0; |
| 756 | } |
| 757 | |
| 758 | /* _rmnet_vnd_update_flow_map() - Add or remove individual TC flow handles |
| 759 | * @action: One of RMNET_VND_UF_ACTION_ADD / RMNET_VND_UF_ACTION_DEL |
| 760 | * @itm: Flow mapping object |
| 761 | * @map_flow: TC flow handle |
| 762 | * |
| 763 | * RMNET_VND_UF_ACTION_ADD: |
| 764 | * Will check for a free mapping slot in the mapping object. If one is found, |
| 765 | * valid for that slot will be set to 1 and the value will be set. |
| 766 | * |
| 767 | * RMNET_VND_UF_ACTION_DEL: |
| 768 | * Will check for matching tc handle. If found, valid for that slot will be |
| 769 | * set to 0 and the value will also be zeroed. |
| 770 | * |
| 771 | * Return: |
| 772 | * - RMNET_VND_UPDATE_FLOW_OK tc flow handle is added/removed ok |
| 773 | * - RMNET_VND_UPDATE_FLOW_NO_MORE_ROOM if there are no more tc handles |
| 774 | * - RMNET_VND_UPDATE_FLOW_NO_VALID_LEFT if flow mapping is now empty |
| 775 | * - RMNET_VND_UPDATE_FLOW_NO_ACTION if no action was taken |
| 776 | */ |
| 777 | static int _rmnet_vnd_update_flow_map(u8 action, |
| 778 | struct rmnet_map_flow_mapping_s *itm, |
| 779 | u32 tc_flow) |
| 780 | { |
| 781 | int rc, i, j; |
| 782 | |
| 783 | rc = RMNET_VND_UPDATE_FLOW_OK; |
| 784 | |
| 785 | switch (action) { |
| 786 | case RMNET_VND_UF_ACTION_ADD: |
| 787 | rc = RMNET_VND_UPDATE_FLOW_NO_MORE_ROOM; |
| 788 | for (i = 0; i < RMNET_MAP_FLOW_NUM_TC_HANDLE; i++) { |
| 789 | if (itm->tc_flow_valid[i] == 0) { |
| 790 | itm->tc_flow_valid[i] = 1; |
| 791 | itm->tc_flow_id[i] = tc_flow; |
| 792 | rc = RMNET_VND_UPDATE_FLOW_OK; |
| 793 | LOGD("{%pK}->tc_flow_id[%d]=%08X", |
| 794 | itm, i, tc_flow); |
| 795 | break; |
| 796 | } |
| 797 | } |
| 798 | break; |
| 799 | |
| 800 | case RMNET_VND_UF_ACTION_DEL: |
| 801 | j = 0; |
| 802 | rc = RMNET_VND_UPDATE_FLOW_OK; |
| 803 | for (i = 0; i < RMNET_MAP_FLOW_NUM_TC_HANDLE; i++) { |
| 804 | if (itm->tc_flow_valid[i] == 1) { |
| 805 | if (itm->tc_flow_id[i] == tc_flow) { |
| 806 | itm->tc_flow_valid[i] = 0; |
| 807 | itm->tc_flow_id[i] = 0; |
| 808 | j++; |
| 809 | LOGD("{%pK}->tc_flow_id[%d]=0", itm, i); |
| 810 | } |
| 811 | } else { |
| 812 | j++; |
| 813 | } |
| 814 | } |
| 815 | if (j == RMNET_MAP_FLOW_NUM_TC_HANDLE) |
| 816 | rc = RMNET_VND_UPDATE_FLOW_NO_VALID_LEFT; |
| 817 | break; |
| 818 | |
| 819 | default: |
| 820 | rc = RMNET_VND_UPDATE_FLOW_NO_ACTION; |
| 821 | break; |
| 822 | } |
| 823 | return rc; |
| 824 | } |
| 825 | |
| 826 | /* rmnet_vnd_add_tc_flow() - Add a MAP/TC flow handle mapping |
| 827 | * @id: Virtual network device ID |
| 828 | * @map_flow: MAP flow handle |
| 829 | * @tc_flow: TC flow handle |
| 830 | * |
| 831 | * Checkes for an existing flow mapping object corresponding to map_flow. If one |
| 832 | * is found, then it will try to add to the existing mapping object. Otherwise, |
| 833 | * a new mapping object is created. |
| 834 | * |
| 835 | * Return: |
| 836 | * - RMNET_CONFIG_OK if successful |
| 837 | * - RMNET_CONFIG_TC_HANDLE_FULL if there is no more room in the map object |
| 838 | * - RMNET_CONFIG_NOMEM failed to allocate a new map object |
| 839 | */ |
| 840 | int rmnet_vnd_add_tc_flow(u32 id, u32 map_flow, u32 tc_flow) |
| 841 | { |
| 842 | struct rmnet_map_flow_mapping_s *itm; |
| 843 | struct net_device *dev; |
| 844 | struct rmnet_vnd_private_s *dev_conf; |
| 845 | int r; |
| 846 | unsigned long flags; |
| 847 | |
| 848 | if ((id < 0) || (id >= RMNET_DATA_MAX_VND) || !rmnet_devices[id]) { |
| 849 | LOGM("Invalid VND id [%d]", id); |
| 850 | return RMNET_CONFIG_NO_SUCH_DEVICE; |
| 851 | } |
| 852 | |
| 853 | dev = rmnet_devices[id]; |
| 854 | dev_conf = (struct rmnet_vnd_private_s *)netdev_priv(dev); |
| 855 | |
| 856 | if (!dev_conf) |
| 857 | return RMNET_CONFIG_NO_SUCH_DEVICE; |
| 858 | |
| 859 | write_lock_irqsave(&dev_conf->flow_map_lock, flags); |
| 860 | itm = _rmnet_vnd_get_flow_map(dev_conf, map_flow); |
| 861 | if (itm) { |
| 862 | r = _rmnet_vnd_update_flow_map(RMNET_VND_UF_ACTION_ADD, |
| 863 | itm, tc_flow); |
| 864 | if (r != RMNET_VND_UPDATE_FLOW_OK) { |
| 865 | write_unlock_irqrestore(&dev_conf->flow_map_lock, |
| 866 | flags); |
| 867 | return RMNET_CONFIG_TC_HANDLE_FULL; |
| 868 | } |
| 869 | write_unlock_irqrestore(&dev_conf->flow_map_lock, flags); |
| 870 | return RMNET_CONFIG_OK; |
| 871 | } |
| 872 | write_unlock_irqrestore(&dev_conf->flow_map_lock, flags); |
| 873 | |
| 874 | itm = kmalloc(sizeof(*itm), GFP_KERNEL); |
| 875 | |
| 876 | if (!itm) { |
| 877 | LOGM("%s", "Failure allocating flow mapping"); |
| 878 | return RMNET_CONFIG_NOMEM; |
| 879 | } |
| 880 | memset(itm, 0, sizeof(struct rmnet_map_flow_mapping_s)); |
| 881 | |
| 882 | itm->map_flow_id = map_flow; |
| 883 | itm->tc_flow_valid[0] = 1; |
| 884 | itm->tc_flow_id[0] = tc_flow; |
| 885 | |
| 886 | /* How can we dynamically init these safely? Kernel only provides static |
| 887 | * initializers for atomic_t |
| 888 | */ |
| 889 | itm->v4_seq.counter = 0; /* Init is broken: ATOMIC_INIT(0); */ |
| 890 | itm->v6_seq.counter = 0; /* Init is broken: ATOMIC_INIT(0); */ |
| 891 | |
| 892 | write_lock_irqsave(&dev_conf->flow_map_lock, flags); |
| 893 | list_add(&itm->list, &dev_conf->flow_head); |
| 894 | write_unlock_irqrestore(&dev_conf->flow_map_lock, flags); |
| 895 | |
| 896 | LOGD("Created flow mapping [%s][0x%08X][0x%08X]@%pK", |
| 897 | dev->name, itm->map_flow_id, itm->tc_flow_id[0], itm); |
| 898 | |
| 899 | return RMNET_CONFIG_OK; |
| 900 | } |
| 901 | |
| 902 | /* rmnet_vnd_del_tc_flow() - Delete a MAP/TC flow handle mapping |
| 903 | * @id: Virtual network device ID |
| 904 | * @map_flow: MAP flow handle |
| 905 | * @tc_flow: TC flow handle |
| 906 | * |
| 907 | * Checkes for an existing flow mapping object corresponding to map_flow. If one |
| 908 | * is found, then it will try to remove the existing tc_flow mapping. If the |
| 909 | * mapping object no longer contains any mappings, then it is freed. Otherwise |
| 910 | * the mapping object is left in the list |
| 911 | * |
| 912 | * Return: |
| 913 | * - RMNET_CONFIG_OK if successful or if there was no such tc_flow |
| 914 | * - RMNET_CONFIG_INVALID_REQUEST if there is no such map_flow |
| 915 | */ |
| 916 | int rmnet_vnd_del_tc_flow(u32 id, u32 map_flow, u32 tc_flow) |
| 917 | { |
| 918 | struct rmnet_vnd_private_s *dev_conf; |
| 919 | struct net_device *dev; |
| 920 | struct rmnet_map_flow_mapping_s *itm; |
| 921 | int r; |
| 922 | unsigned long flags; |
| 923 | int rc = RMNET_CONFIG_OK; |
| 924 | |
| 925 | if ((id < 0) || (id >= RMNET_DATA_MAX_VND) || !rmnet_devices[id]) { |
| 926 | LOGM("Invalid VND id [%d]", id); |
| 927 | return RMNET_CONFIG_NO_SUCH_DEVICE; |
| 928 | } |
| 929 | |
| 930 | dev = rmnet_devices[id]; |
| 931 | dev_conf = (struct rmnet_vnd_private_s *)netdev_priv(dev); |
| 932 | |
| 933 | if (!dev_conf) |
| 934 | return RMNET_CONFIG_NO_SUCH_DEVICE; |
| 935 | |
| 936 | r = RMNET_VND_UPDATE_FLOW_NO_ACTION; |
| 937 | write_lock_irqsave(&dev_conf->flow_map_lock, flags); |
| 938 | itm = _rmnet_vnd_get_flow_map(dev_conf, map_flow); |
| 939 | if (!itm) { |
| 940 | rc = RMNET_CONFIG_INVALID_REQUEST; |
| 941 | } else { |
| 942 | r = _rmnet_vnd_update_flow_map(RMNET_VND_UF_ACTION_DEL, |
| 943 | itm, tc_flow); |
| 944 | if (r == RMNET_VND_UPDATE_FLOW_NO_VALID_LEFT) |
| 945 | list_del(&itm->list); |
| 946 | } |
| 947 | write_unlock_irqrestore(&dev_conf->flow_map_lock, flags); |
| 948 | |
| 949 | if (r == RMNET_VND_UPDATE_FLOW_NO_VALID_LEFT) { |
| 950 | if (itm) |
| 951 | LOGD("Removed flow mapping [%s][0x%08X]@%pK", |
| 952 | dev->name, itm->map_flow_id, itm); |
| 953 | kfree(itm); |
| 954 | } |
| 955 | |
| 956 | return rc; |
| 957 | } |
| 958 | |
| 959 | /* rmnet_vnd_do_flow_control() - Process flow control request |
| 960 | * @dev: Virtual network device node to do lookup on |
| 961 | * @map_flow_id: Flow ID from MAP message |
| 962 | * @v4_seq: pointer to IPv4 indication sequence number |
| 963 | * @v6_seq: pointer to IPv6 indication sequence number |
| 964 | * @enable: boolean to enable/disable flow. |
| 965 | * |
| 966 | * Return: |
| 967 | * - 0 if successful |
| 968 | * - 1 if no mapping is found |
| 969 | * - 2 if dev is not RmNet virtual network device node |
| 970 | */ |
| 971 | int rmnet_vnd_do_flow_control(struct net_device *dev, |
| 972 | u32 map_flow_id, |
| 973 | u16 v4_seq, |
| 974 | u16 v6_seq, |
| 975 | int enable) |
| 976 | { |
| 977 | struct rmnet_vnd_private_s *dev_conf; |
| 978 | struct rmnet_map_flow_mapping_s *itm; |
| 979 | int do_fc, error, i; |
| 980 | |
| 981 | error = 0; |
| 982 | do_fc = 0; |
| 983 | |
| 984 | if (unlikely(!dev)) |
| 985 | return 2; |
| 986 | |
| 987 | if (!rmnet_vnd_is_vnd(dev)) |
| 988 | return 2; |
| 989 | |
| 990 | dev_conf = (struct rmnet_vnd_private_s *)netdev_priv(dev); |
| 991 | |
| 992 | if (unlikely(!dev_conf)) |
| 993 | return 2; |
| 994 | |
| 995 | read_lock(&dev_conf->flow_map_lock); |
| 996 | if (map_flow_id == 0xFFFFFFFF) { |
| 997 | itm = &dev_conf->root_flow; |
| 998 | goto nolookup; |
| 999 | } |
| 1000 | |
| 1001 | itm = _rmnet_vnd_get_flow_map(dev_conf, map_flow_id); |
| 1002 | |
| 1003 | if (!itm) { |
| 1004 | LOGL("Got flow control request for unknown flow %08X", |
| 1005 | map_flow_id); |
| 1006 | goto fcdone; |
| 1007 | } |
| 1008 | |
| 1009 | nolookup: |
| 1010 | if (v4_seq == 0 || v4_seq >= atomic_read(&itm->v4_seq)) { |
| 1011 | atomic_set(&itm->v4_seq, v4_seq); |
| 1012 | if (map_flow_id == 0xFFFFFFFF) { |
| 1013 | LOGD("Setting VND TX queue state to %d", enable); |
| 1014 | /* Although we expect similar number of enable/disable |
| 1015 | * commands, optimize for the disable. That is more |
| 1016 | * latency sensitive than enable |
| 1017 | */ |
| 1018 | if (unlikely(enable)) |
| 1019 | netif_wake_queue(dev); |
| 1020 | else |
| 1021 | netif_stop_queue(dev); |
| 1022 | trace_rmnet_fc_map(0xFFFFFFFF, 0, enable); |
| 1023 | goto fcdone; |
| 1024 | } |
| 1025 | for (i = 0; i < RMNET_MAP_FLOW_NUM_TC_HANDLE; i++) { |
| 1026 | if (itm->tc_flow_valid[i] == 1) { |
| 1027 | LOGD("Found [%s][0x%08X][%d:0x%08X]", |
| 1028 | dev->name, itm->map_flow_id, i, |
| 1029 | itm->tc_flow_id[i]); |
| 1030 | |
| 1031 | _rmnet_vnd_do_flow_control(dev, |
| 1032 | itm->tc_flow_id[i], |
| 1033 | enable); |
| 1034 | } |
| 1035 | } |
| 1036 | } else { |
| 1037 | LOGD("Internal seq(%hd) higher than called(%hd)", |
| 1038 | atomic_read(&itm->v4_seq), v4_seq); |
| 1039 | } |
| 1040 | |
| 1041 | fcdone: |
| 1042 | read_unlock(&dev_conf->flow_map_lock); |
| 1043 | |
| 1044 | return error; |
| 1045 | } |
| 1046 | |
| 1047 | /* rmnet_vnd_get_by_id() - Get VND by array index ID |
| 1048 | * @id: Virtual network deice id [0:RMNET_DATA_MAX_VND] |
| 1049 | * |
| 1050 | * Return: |
| 1051 | * - 0 if no device or ID out of range |
| 1052 | * - otherwise return pointer to VND net_device struct |
| 1053 | */ |
| 1054 | struct net_device *rmnet_vnd_get_by_id(int id) |
| 1055 | { |
| 1056 | if (id < 0 || id >= RMNET_DATA_MAX_VND) { |
| 1057 | LOGE("Bug; VND ID out of bounds"); |
| 1058 | return 0; |
| 1059 | } |
| 1060 | return rmnet_devices[id]; |
| 1061 | } |