Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 1 | /* |
Jeff Johnson | 103cc5b | 2016-01-08 15:42:27 -0800 | [diff] [blame] | 2 | * Copyright (c) 2015-2016 The Linux Foundation. All rights reserved. |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 3 | * |
| 4 | * Previously licensed under the ISC license by Qualcomm Atheros, Inc. |
| 5 | * |
| 6 | * Permission to use, copy, modify, and/or distribute this software for |
| 7 | * any purpose with or without fee is hereby granted, provided that the |
| 8 | * above copyright notice and this permission notice appear in all |
| 9 | * copies. |
| 10 | * |
| 11 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL |
| 12 | * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED |
| 13 | * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE |
| 14 | * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| 15 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 16 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 17 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 18 | * PERFORMANCE OF THIS SOFTWARE. |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | * This file was originally distributed by Qualcomm Atheros, Inc. |
| 23 | * under proprietary terms before Copyright ownership was assigned |
| 24 | * to the Linux Foundation. |
| 25 | */ |
| 26 | |
| 27 | /** |
| 28 | * DOC: wlan_hdd_lro.c |
| 29 | * |
| 30 | * WLAN HDD LRO interface implementation |
| 31 | */ |
| 32 | |
Jeff Johnson | 103cc5b | 2016-01-08 15:42:27 -0800 | [diff] [blame] | 33 | /* denote that this file does not allow legacy hddLog */ |
| 34 | #define HDD_DISALLOW_LEGACY_HDDLOG 1 |
| 35 | |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 36 | #include <wlan_hdd_includes.h> |
| 37 | #include <cdf_types.h> |
| 38 | #include <wlan_hdd_lro.h> |
| 39 | #include <wlan_hdd_napi.h> |
| 40 | #include <wma_api.h> |
| 41 | #include <ol_txrx_types.h> |
| 42 | #include <ol_cfg.h> |
| 43 | |
| 44 | #include <linux/inet_lro.h> |
| 45 | #include <linux/list.h> |
| 46 | #include <linux/random.h> |
| 47 | #include <net/tcp.h> |
| 48 | |
| 49 | #define LRO_MAX_AGGR_SIZE 100 |
| 50 | |
| 51 | #define LRO_VALID_FIELDS \ |
| 52 | (LRO_DESC | LRO_ELIGIBILITY_CHECKED | LRO_TCP_ACK_NUM | \ |
| 53 | LRO_TCP_DATA_CSUM | LRO_TCP_SEQ_NUM | LRO_TCP_WIN) |
| 54 | |
| 55 | /** |
| 56 | * hdd_lro_get_skb_header() - LRO callback function |
| 57 | * @skb: network buffer |
| 58 | * @ip_hdr: contains a pointer to the IP header |
| 59 | * @tcpudp_hdr: contains a pointer to the TCP header |
| 60 | * @hdr_flags: indicates if this is a TCP, IPV4 frame |
| 61 | * @priv: private driver specific opaque pointer |
| 62 | * |
| 63 | * Get the IP and TCP headers from the skb |
| 64 | * |
| 65 | * Return: 0 - success, < 0 - failure |
| 66 | */ |
| 67 | static int hdd_lro_get_skb_header(struct sk_buff *skb, void **ip_hdr, |
| 68 | void **tcpudp_hdr, u64 *hdr_flags, void *priv) |
| 69 | { |
Houston Hoffman | 43d47fa | 2016-02-24 16:34:30 -0800 | [diff] [blame^] | 70 | if (NBUF_CB_RX_IPV6_PROTO(skb)) { |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 71 | hdr_flags = 0; |
| 72 | return -EINVAL; |
| 73 | } |
| 74 | |
| 75 | *hdr_flags |= (LRO_IPV4 | LRO_TCP); |
| 76 | (*ip_hdr) = skb->data; |
Houston Hoffman | 43d47fa | 2016-02-24 16:34:30 -0800 | [diff] [blame^] | 77 | (*tcpudp_hdr) = skb->data + NBUF_CB_RX_TCP_OFFSET(skb); |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * hdd_lro_desc_pool_init() - Initialize the free pool of LRO |
| 83 | * descriptors |
| 84 | * @lro_desc_pool: free pool of the LRO descriptors |
| 85 | * @lro_mgr: LRO manager |
| 86 | * |
| 87 | * Initialize a list that holds the free LRO descriptors |
| 88 | * |
| 89 | * Return: none |
| 90 | */ |
| 91 | static void hdd_lro_desc_pool_init(struct hdd_lro_desc_pool *lro_desc_pool, |
| 92 | struct net_lro_mgr *lro_mgr) |
| 93 | { |
| 94 | int i; |
| 95 | |
| 96 | INIT_LIST_HEAD(&lro_desc_pool->lro_free_list_head); |
| 97 | |
| 98 | for (i = 0; i < LRO_DESC_POOL_SZ; i++) { |
| 99 | lro_desc_pool->lro_desc_array[i].lro_desc = |
| 100 | &lro_mgr->lro_arr[i]; |
| 101 | list_add_tail(&lro_desc_pool->lro_desc_array[i].lro_node, |
| 102 | &lro_desc_pool->lro_free_list_head); |
| 103 | } |
| 104 | cdf_spinlock_init(&lro_desc_pool->lro_pool_lock); |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * hdd_lro_desc_info_init() - Initialize the LRO descriptors |
| 109 | * @hdd_info: HDD LRO data structure |
| 110 | * |
| 111 | * Initialize the free pool of LRO descriptors and the entries |
| 112 | * of the hash table |
| 113 | * |
| 114 | * Return: none |
| 115 | */ |
| 116 | static void hdd_lro_desc_info_init(struct hdd_lro_s *hdd_info) |
| 117 | { |
| 118 | int i; |
| 119 | |
| 120 | /* Initialize pool of free LRO desc.*/ |
| 121 | hdd_lro_desc_pool_init(&hdd_info->lro_desc_info.lro_desc_pool, |
| 122 | hdd_info->lro_mgr); |
| 123 | |
| 124 | /* Initialize the hash table of LRO desc.*/ |
| 125 | for (i = 0; i < LRO_DESC_TABLE_SZ; i++) { |
| 126 | /* initialize the flows in the hash table */ |
| 127 | INIT_LIST_HEAD(&hdd_info->lro_desc_info. |
| 128 | lro_hash_table[i].lro_desc_list); |
| 129 | } |
| 130 | |
| 131 | cdf_spinlock_init(&hdd_info->lro_desc_info.lro_hash_lock); |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * hdd_lro_desc_pool_deinit() - Free the LRO descriptor list |
| 136 | * @hdd_info: HDD LRO data structure |
| 137 | * |
| 138 | * Free the pool of LRO descriptors |
| 139 | * |
| 140 | * Return: none |
| 141 | */ |
| 142 | static void hdd_lro_desc_pool_deinit(struct hdd_lro_desc_pool *lro_desc_pool) |
| 143 | { |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 144 | INIT_LIST_HEAD(&lro_desc_pool->lro_free_list_head); |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 145 | cdf_spinlock_destroy(&lro_desc_pool->lro_pool_lock); |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * hdd_lro_desc_info_deinit() - Deinitialize the LRO descriptors |
| 150 | * |
| 151 | * @hdd_info: HDD LRO data structure |
| 152 | * |
| 153 | * Deinitialize the free pool of LRO descriptors and the entries |
| 154 | * of the hash table |
| 155 | * |
| 156 | * Return: none |
| 157 | */ |
| 158 | static void hdd_lro_desc_info_deinit(struct hdd_lro_s *hdd_info) |
| 159 | { |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 160 | struct hdd_lro_desc_info *desc_info = &hdd_info->lro_desc_info; |
| 161 | |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 162 | hdd_lro_desc_pool_deinit(&desc_info->lro_desc_pool); |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 163 | cdf_spinlock_destroy(&desc_info->lro_hash_lock); |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 164 | } |
| 165 | |
| 166 | /** |
| 167 | * hdd_lro_tcp_flow_match() - function to check for a flow match |
| 168 | * @iph: IP header |
| 169 | * @tcph: TCP header |
| 170 | * @lro_desc: LRO decriptor |
| 171 | * |
| 172 | * Checks if the descriptor belongs to the same flow as the one |
| 173 | * indicated by the TCP and IP header. |
| 174 | * |
| 175 | * Return: true - flow match, false - flow does not match |
| 176 | */ |
| 177 | static inline bool hdd_lro_tcp_flow_match(struct net_lro_desc *lro_desc, |
| 178 | struct iphdr *iph, |
| 179 | struct tcphdr *tcph) |
| 180 | { |
| 181 | if ((lro_desc->tcph->source != tcph->source) || |
| 182 | (lro_desc->tcph->dest != tcph->dest) || |
| 183 | (lro_desc->iph->saddr != iph->saddr) || |
| 184 | (lro_desc->iph->daddr != iph->daddr)) |
| 185 | return false; |
| 186 | |
| 187 | return true; |
| 188 | |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * hdd_lro_desc_find() - LRO descriptor look-up function |
| 193 | * |
| 194 | * @adapter: HDD adaptor |
| 195 | * @skb: network buffer |
| 196 | * @iph: IP header |
| 197 | * @tcph: TCP header |
| 198 | * @lro_desc: contains a pointer to the LRO decriptor |
| 199 | * |
| 200 | * Look-up the LRO descriptor in the hash table based on the |
| 201 | * flow ID toeplitz. If the flow is not found, allocates a new |
| 202 | * LRO descriptor and places it in the hash table |
| 203 | * |
| 204 | * Return: 0 - success, < 0 - failure |
| 205 | */ |
| 206 | static int hdd_lro_desc_find(hdd_adapter_t *adapter, |
| 207 | struct sk_buff *skb, struct iphdr *iph, struct tcphdr *tcph, |
| 208 | struct net_lro_desc **lro_desc) |
| 209 | { |
| 210 | uint32_t i; |
| 211 | struct hdd_lro_desc_table *lro_hash_table; |
| 212 | struct list_head *ptr; |
| 213 | struct hdd_lro_desc_entry *entry; |
| 214 | struct hdd_lro_desc_pool free_pool; |
| 215 | struct hdd_lro_desc_info *desc_info = &adapter->lro_info.lro_desc_info; |
| 216 | |
| 217 | *lro_desc = NULL; |
Houston Hoffman | 43d47fa | 2016-02-24 16:34:30 -0800 | [diff] [blame^] | 218 | i = NBUF_CB_RX_FLOW_ID_TOEPLITZ(skb) & LRO_DESC_TABLE_SZ_MASK; |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 219 | |
| 220 | lro_hash_table = &desc_info->lro_hash_table[i]; |
| 221 | |
| 222 | if (!lro_hash_table) { |
| 223 | hdd_err("Invalid hash entry"); |
| 224 | CDF_ASSERT(0); |
| 225 | return -EINVAL; |
| 226 | } |
| 227 | |
| 228 | cdf_spin_lock_bh(&desc_info->lro_hash_lock); |
| 229 | /* Check if this flow exists in the descriptor list */ |
| 230 | list_for_each(ptr, &lro_hash_table->lro_desc_list) { |
| 231 | struct net_lro_desc *tmp_lro_desc = NULL; |
| 232 | entry = list_entry(ptr, struct hdd_lro_desc_entry, lro_node); |
| 233 | tmp_lro_desc = entry->lro_desc; |
| 234 | if (tmp_lro_desc->active) { |
| 235 | if (hdd_lro_tcp_flow_match(tmp_lro_desc, iph, tcph)) { |
| 236 | *lro_desc = entry->lro_desc; |
| 237 | cdf_spin_unlock_bh(&desc_info->lro_hash_lock); |
| 238 | return 0; |
| 239 | } |
| 240 | } |
| 241 | } |
| 242 | cdf_spin_unlock_bh(&desc_info->lro_hash_lock); |
| 243 | |
| 244 | /* no existing flow found, a new LRO desc needs to be allocated */ |
| 245 | free_pool = adapter->lro_info.lro_desc_info.lro_desc_pool; |
| 246 | cdf_spin_lock_bh(&free_pool.lro_pool_lock); |
| 247 | entry = list_first_entry_or_null( |
| 248 | &free_pool.lro_free_list_head, |
| 249 | struct hdd_lro_desc_entry, lro_node); |
| 250 | if (NULL == entry) { |
| 251 | hdd_err("Could not allocate LRO desc!"); |
| 252 | cdf_spin_unlock_bh(&free_pool.lro_pool_lock); |
| 253 | return -ENOMEM; |
| 254 | } |
| 255 | |
| 256 | list_del_init(&entry->lro_node); |
| 257 | cdf_spin_unlock_bh(&free_pool.lro_pool_lock); |
| 258 | |
| 259 | if (NULL == entry->lro_desc) { |
| 260 | hdd_err("entry->lro_desc is NULL!\n"); |
| 261 | return -EINVAL; |
| 262 | } |
| 263 | |
| 264 | cdf_mem_zero((void *)entry->lro_desc, sizeof(struct net_lro_desc)); |
| 265 | |
| 266 | /* |
| 267 | * lro_desc->active should be 0 and lro_desc->tcp_rcv_tsval |
| 268 | * should be 0 for newly allocated lro descriptors |
| 269 | */ |
| 270 | cdf_spin_lock_bh(&desc_info->lro_hash_lock); |
| 271 | list_add_tail(&entry->lro_node, |
| 272 | &lro_hash_table->lro_desc_list); |
| 273 | cdf_spin_unlock_bh(&desc_info->lro_hash_lock); |
| 274 | *lro_desc = entry->lro_desc; |
| 275 | |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | /** |
| 280 | * hdd_lro_get_desc() - LRO descriptor look-up function |
| 281 | * @iph: IP header |
| 282 | * @tcph: TCP header |
| 283 | * @lro_arr: Array of LRO decriptors |
| 284 | * @lro_mgr: LRO manager |
| 285 | * |
| 286 | * Looks-up the LRO descriptor for a given flow |
| 287 | * |
| 288 | * Return: LRO descriptor |
| 289 | */ |
| 290 | static struct net_lro_desc *hdd_lro_get_desc(struct net_lro_mgr *lro_mgr, |
| 291 | struct net_lro_desc *lro_arr, |
| 292 | struct iphdr *iph, |
| 293 | struct tcphdr *tcph) |
| 294 | { |
| 295 | int i; |
| 296 | |
| 297 | for (i = 0; i < lro_mgr->max_desc; i++) { |
| 298 | if (lro_arr[i].active) |
| 299 | if (hdd_lro_tcp_flow_match(&lro_arr[i], iph, tcph)) |
| 300 | return &lro_arr[i]; |
| 301 | } |
| 302 | |
| 303 | return NULL; |
| 304 | } |
| 305 | |
| 306 | /** |
| 307 | * hdd_lro_eligible() - LRO eligibilty check |
| 308 | * @iph: IP header |
| 309 | * @tcph: TCP header |
| 310 | * @adapter: HDD adaptor |
| 311 | * @desc: LRO descriptor |
| 312 | * @skb: network buffer |
| 313 | * |
| 314 | * Determines if the frame is LRO eligible |
| 315 | * |
| 316 | * Return: true - LRO eligible frame, false - frame is not LRO |
| 317 | * eligible |
| 318 | */ |
| 319 | static bool hdd_lro_eligible(hdd_adapter_t *adapter, struct sk_buff *skb, |
| 320 | struct iphdr *iph, struct tcphdr *tcph, struct net_lro_desc **desc) |
| 321 | { |
| 322 | struct net_lro_desc *lro_desc = NULL; |
| 323 | int hw_lro_eligible = |
Houston Hoffman | 43d47fa | 2016-02-24 16:34:30 -0800 | [diff] [blame^] | 324 | NBUF_CB_RX_LRO_ELIGIBLE(skb) && (!NBUF_CB_RX_TCP_PURE_ACK(skb)); |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 325 | |
| 326 | if (!hw_lro_eligible) |
| 327 | return false; |
| 328 | |
| 329 | if (0 != hdd_lro_desc_find(adapter, skb, iph, tcph, desc)) { |
| 330 | hdd_err("finding the LRO desc failed"); |
| 331 | return false; |
| 332 | } |
| 333 | |
| 334 | lro_desc = *desc; |
| 335 | if (!lro_desc) |
| 336 | return false; |
| 337 | |
| 338 | /* if this is not the first skb, check the timestamp option */ |
| 339 | if (lro_desc->tcp_rcv_tsval) { |
| 340 | if (tcph->doff == 8) { |
| 341 | __be32 *topt = (__be32 *)(tcph + 1); |
| 342 | |
| 343 | if (*topt != htonl((TCPOPT_NOP << 24) |
| 344 | |(TCPOPT_NOP << 16) |
| 345 | | (TCPOPT_TIMESTAMP << 8) |
| 346 | | TCPOLEN_TIMESTAMP)) |
| 347 | return true; |
| 348 | |
| 349 | /* timestamp should be in right order */ |
| 350 | topt++; |
| 351 | if (after(ntohl(lro_desc->tcp_rcv_tsval), |
| 352 | ntohl(*topt))) |
| 353 | return false; |
| 354 | |
| 355 | /* timestamp reply should not be zero */ |
| 356 | topt++; |
| 357 | if (*topt == 0) |
| 358 | return false; |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | return true; |
| 363 | } |
| 364 | |
| 365 | /** |
| 366 | * hdd_lro_desc_free() - Free the LRO descriptor |
| 367 | * @adapter: HDD adaptor |
| 368 | * @desc: LRO descriptor |
| 369 | * |
| 370 | * Return the LRO descriptor to the free pool |
| 371 | * |
| 372 | * Return: none |
| 373 | */ |
| 374 | static void hdd_lro_desc_free(struct net_lro_desc *desc, |
| 375 | hdd_adapter_t *adapter) |
| 376 | { |
| 377 | struct hdd_lro_desc_entry *entry; |
| 378 | struct net_lro_desc *arr_base = adapter->lro_info.lro_mgr->lro_arr; |
| 379 | struct hdd_lro_desc_info *desc_info = &adapter->lro_info.lro_desc_info; |
| 380 | int i = desc - arr_base; |
| 381 | |
| 382 | if (i >= LRO_DESC_POOL_SZ) { |
| 383 | hdd_err("invalid index %d", i); |
| 384 | return; |
| 385 | } |
| 386 | |
| 387 | entry = &desc_info->lro_desc_pool.lro_desc_array[i]; |
| 388 | |
| 389 | cdf_spin_lock_bh(&desc_info->lro_hash_lock); |
| 390 | list_del_init(&entry->lro_node); |
| 391 | cdf_spin_unlock_bh(&desc_info->lro_hash_lock); |
| 392 | |
| 393 | cdf_spin_lock_bh(&desc_info->lro_desc_pool.lro_pool_lock); |
| 394 | list_add_tail(&entry->lro_node, &desc_info-> |
| 395 | lro_desc_pool.lro_free_list_head); |
| 396 | cdf_spin_unlock_bh(&desc_info->lro_desc_pool.lro_pool_lock); |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * hdd_lro_flush_pkt() - function to flush the LRO flow |
| 401 | * @iph: IP header |
| 402 | * @tcph: TCP header |
| 403 | * @adapter: HDD adaptor |
| 404 | * @lro_mgr: LRO manager |
| 405 | * |
| 406 | * Flush all the packets aggregated in the LRO manager for the |
| 407 | * flow indicated by the TCP and IP header |
| 408 | * |
| 409 | * Return: none |
| 410 | */ |
| 411 | void hdd_lro_flush_pkt(struct net_lro_mgr *lro_mgr, |
| 412 | struct iphdr *iph, struct tcphdr *tcph, hdd_adapter_t *adapter) |
| 413 | { |
| 414 | struct net_lro_desc *lro_desc; |
| 415 | |
| 416 | lro_desc = hdd_lro_get_desc(lro_mgr, lro_mgr->lro_arr, iph, tcph); |
| 417 | |
| 418 | if (!lro_desc) |
| 419 | return; |
| 420 | |
| 421 | hdd_lro_desc_free(lro_desc, adapter); |
| 422 | lro_flush_desc(lro_mgr, lro_desc); |
| 423 | } |
| 424 | |
| 425 | /** |
| 426 | * hdd_lro_flush() - LRO flush callback |
| 427 | * @data: opaque pointer containing HDD specific information |
| 428 | * |
| 429 | * Callback registered to flush all the packets aggregated in |
| 430 | * the LRO manager for all the flows |
| 431 | * |
| 432 | * Return: none |
| 433 | */ |
| 434 | void hdd_lro_flush(void *data) |
| 435 | { |
| 436 | hdd_adapter_t *adapter = (hdd_adapter_t *)data; |
| 437 | int i; |
| 438 | |
| 439 | for (i = 0; i < adapter->lro_info.lro_mgr->max_desc; i++) { |
| 440 | if (adapter->lro_info.lro_mgr->lro_arr[i].active) { |
| 441 | hdd_lro_desc_free( |
| 442 | &adapter->lro_info.lro_mgr->lro_arr[i], |
| 443 | (void *)adapter); |
| 444 | lro_flush_desc(adapter->lro_info.lro_mgr, |
| 445 | &adapter->lro_info.lro_mgr->lro_arr[i]); |
| 446 | } |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | /** |
| 451 | * hdd_lro_init() - initialization for LRO |
| 452 | * @hdd_ctx: HDD context |
| 453 | * |
| 454 | * This function sends the LRO configuration to the firmware |
| 455 | * via WMA |
| 456 | * |
| 457 | * Return: 0 - success, < 0 - failure |
| 458 | */ |
| 459 | int hdd_lro_init(hdd_context_t *hdd_ctx) |
| 460 | { |
| 461 | struct wma_lro_config_cmd_t lro_config; |
| 462 | |
| 463 | if (!hdd_ctx->config->lro_enable) { |
Jeff Johnson | 103cc5b | 2016-01-08 15:42:27 -0800 | [diff] [blame] | 464 | hdd_err("LRO Disabled"); |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 465 | return 0; |
| 466 | } |
| 467 | |
| 468 | lro_config.lro_enable = 1; |
| 469 | lro_config.tcp_flag = TCPHDR_ACK; |
| 470 | lro_config.tcp_flag_mask = TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST | |
| 471 | TCPHDR_ACK | TCPHDR_URG | TCPHDR_ECE | TCPHDR_CWR; |
| 472 | |
| 473 | get_random_bytes(lro_config.toeplitz_hash_ipv4, |
| 474 | (sizeof(lro_config.toeplitz_hash_ipv4[0]) * |
| 475 | LRO_IPV4_SEED_ARR_SZ)); |
| 476 | |
| 477 | get_random_bytes(lro_config.toeplitz_hash_ipv6, |
| 478 | (sizeof(lro_config.toeplitz_hash_ipv6[0]) * |
| 479 | LRO_IPV6_SEED_ARR_SZ)); |
| 480 | |
| 481 | hdd_debug("sending the LRO configuration to the fw"); |
| 482 | if (0 != wma_lro_init(&lro_config)) { |
| 483 | hdd_err("Failed to send LRO configuration!"); |
| 484 | hdd_ctx->config->lro_enable = 0; |
| 485 | return -EAGAIN; |
| 486 | } |
| 487 | |
| 488 | return 0; |
| 489 | } |
| 490 | |
| 491 | /** |
| 492 | * hdd_lro_enable() - enable LRO |
| 493 | * @hdd_ctx: HDD context |
| 494 | * @adapter: HDD adapter |
| 495 | * |
| 496 | * This function enables LRO in the network device attached to |
| 497 | * the HDD adapter. It also allocates the HDD LRO instance for |
| 498 | * that network device |
| 499 | * |
| 500 | * Return: 0 - success, < 0 - failure |
| 501 | */ |
| 502 | int hdd_lro_enable(hdd_context_t *hdd_ctx, |
| 503 | hdd_adapter_t *adapter) |
| 504 | { |
| 505 | struct hdd_lro_s *hdd_lro; |
| 506 | struct ol_txrx_pdev_t *pdev = cds_get_context(CDF_MODULE_ID_TXRX); |
| 507 | size_t lro_mgr_sz, desc_arr_sz, desc_pool_sz, hash_table_sz; |
| 508 | uint8_t *lro_mem_ptr; |
| 509 | |
| 510 | if (!hdd_ctx->config->lro_enable || |
| 511 | NL80211_IFTYPE_STATION != adapter->wdev.iftype) { |
| 512 | hdd_info("LRO Disabled"); |
| 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | hdd_info("LRO Enabled"); |
| 517 | |
| 518 | hdd_lro = &adapter->lro_info; |
| 519 | cdf_mem_zero((void *)hdd_lro, sizeof(struct hdd_lro_s)); |
| 520 | /* |
| 521 | * Allocate all the LRO data structures at once and then carve |
| 522 | * them up as needed |
| 523 | */ |
| 524 | lro_mgr_sz = sizeof(struct net_lro_mgr); |
| 525 | desc_arr_sz = (LRO_DESC_POOL_SZ * sizeof(struct net_lro_desc)); |
| 526 | desc_pool_sz = (LRO_DESC_POOL_SZ * sizeof(struct hdd_lro_desc_entry)); |
| 527 | hash_table_sz = (sizeof(struct hdd_lro_desc_table) * LRO_DESC_TABLE_SZ); |
| 528 | |
| 529 | lro_mem_ptr = cdf_mem_malloc(lro_mgr_sz + desc_arr_sz + desc_pool_sz + |
| 530 | hash_table_sz); |
| 531 | |
| 532 | if (NULL == lro_mem_ptr) { |
| 533 | hdd_err("Unable to allocate memory for LRO"); |
| 534 | hdd_ctx->config->lro_enable = 0; |
| 535 | return -ENOMEM; |
| 536 | } |
| 537 | |
| 538 | /* LRO manager */ |
| 539 | hdd_lro->lro_mgr = (struct net_lro_mgr *)lro_mem_ptr; |
| 540 | lro_mem_ptr += lro_mgr_sz; |
| 541 | |
| 542 | /* LRO decriptor array */ |
| 543 | hdd_lro->lro_mgr->lro_arr = (struct net_lro_desc *)lro_mem_ptr; |
| 544 | lro_mem_ptr += desc_arr_sz; |
| 545 | |
| 546 | /* LRO descriptor pool */ |
| 547 | hdd_lro->lro_desc_info.lro_desc_pool.lro_desc_array = |
| 548 | (struct hdd_lro_desc_entry *)lro_mem_ptr; |
| 549 | lro_mem_ptr += desc_pool_sz; |
| 550 | |
| 551 | /* hash table to store the LRO descriptors */ |
| 552 | hdd_lro->lro_desc_info.lro_hash_table = |
| 553 | (struct hdd_lro_desc_table *)lro_mem_ptr; |
| 554 | |
| 555 | /* Initialize the LRO descriptors */ |
| 556 | hdd_lro_desc_info_init(hdd_lro); |
| 557 | |
| 558 | hdd_lro->lro_mgr->dev = adapter->dev; |
| 559 | if (ol_cfg_is_rx_thread_enabled(pdev->ctrl_pdev)) |
| 560 | hdd_lro->lro_mgr->features = LRO_F_NI; |
| 561 | |
| 562 | if (hdd_napi_enabled(HDD_NAPI_ANY)) |
| 563 | hdd_lro->lro_mgr->features |= LRO_F_NAPI; |
| 564 | |
| 565 | hdd_lro->lro_mgr->ip_summed_aggr = CHECKSUM_UNNECESSARY; |
| 566 | hdd_lro->lro_mgr->max_aggr = LRO_MAX_AGGR_SIZE; |
| 567 | hdd_lro->lro_mgr->get_skb_header = hdd_lro_get_skb_header; |
| 568 | hdd_lro->lro_mgr->ip_summed = CHECKSUM_UNNECESSARY; |
| 569 | hdd_lro->lro_mgr->max_desc = LRO_DESC_POOL_SZ; |
| 570 | |
| 571 | adapter->dev->features |= NETIF_F_LRO; |
| 572 | |
| 573 | /* Register the flush callback */ |
| 574 | ol_register_lro_flush_cb(hdd_lro_flush, adapter); |
| 575 | |
| 576 | return 0; |
| 577 | } |
| 578 | |
| 579 | /** |
| 580 | * hdd_lro_disable() - disable LRO |
| 581 | * @hdd_ctx: HDD context |
| 582 | * @adapter: HDD adapter |
| 583 | * |
| 584 | * This function frees the HDD LRO instance for the network |
| 585 | * device attached to the HDD adapter |
| 586 | * |
| 587 | * Return: none |
| 588 | */ |
| 589 | void hdd_lro_disable(hdd_context_t *hdd_ctx, hdd_adapter_t *adapter) |
| 590 | { |
| 591 | if (!hdd_ctx->config->lro_enable || |
| 592 | NL80211_IFTYPE_STATION != adapter->wdev.iftype) |
| 593 | return; |
| 594 | |
Dhanashri Atre | 8d97817 | 2015-10-30 15:12:03 -0700 | [diff] [blame] | 595 | /* Deregister the flush callback */ |
| 596 | ol_deregister_lro_flush_cb(); |
| 597 | |
| 598 | if (adapter->lro_info.lro_mgr) { |
| 599 | hdd_lro_desc_info_deinit(&adapter->lro_info); |
| 600 | cdf_mem_free(adapter->lro_info.lro_mgr); |
| 601 | adapter->lro_info.lro_mgr = NULL; |
| 602 | adapter->lro_info.lro_desc_info. |
| 603 | lro_desc_pool.lro_desc_array = NULL; |
| 604 | adapter->lro_info.lro_desc_info. |
| 605 | lro_hash_table = NULL; |
| 606 | } |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 607 | return; |
| 608 | } |
| 609 | |
| 610 | /** |
| 611 | * hdd_lro_rx() - LRO receive function |
| 612 | * @hdd_ctx: HDD context |
| 613 | * @adapter: HDD adapter |
| 614 | * @skb: network buffer |
| 615 | * |
| 616 | * Delivers LRO eligible frames to the LRO manager |
| 617 | * |
| 618 | * Return: HDD_LRO_RX - frame delivered to LRO manager |
| 619 | * HDD_LRO_NO_RX - frame not delivered |
| 620 | */ |
| 621 | enum hdd_lro_rx_status hdd_lro_rx(hdd_context_t *hdd_ctx, |
| 622 | hdd_adapter_t *adapter, struct sk_buff *skb) |
| 623 | { |
| 624 | enum hdd_lro_rx_status status = HDD_LRO_NO_RX; |
| 625 | |
| 626 | if ((adapter->dev->features & NETIF_F_LRO) && |
Houston Hoffman | 43d47fa | 2016-02-24 16:34:30 -0800 | [diff] [blame^] | 627 | NBUF_CB_RX_TCP_PROTO(skb)) { |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 628 | struct iphdr *iph; |
| 629 | struct tcphdr *tcph; |
| 630 | struct net_lro_desc *lro_desc = NULL; |
| 631 | iph = (struct iphdr *)skb->data; |
Houston Hoffman | 43d47fa | 2016-02-24 16:34:30 -0800 | [diff] [blame^] | 632 | tcph = (struct tcphdr *)(skb->data + NBUF_CB_RX_TCP_OFFSET(skb)); |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 633 | if (hdd_lro_eligible(adapter, skb, iph, tcph, &lro_desc)) { |
| 634 | struct net_lro_info hdd_lro_info; |
| 635 | |
| 636 | hdd_lro_info.valid_fields = LRO_VALID_FIELDS; |
| 637 | |
| 638 | hdd_lro_info.lro_desc = lro_desc; |
| 639 | hdd_lro_info.lro_eligible = 1; |
Houston Hoffman | 43d47fa | 2016-02-24 16:34:30 -0800 | [diff] [blame^] | 640 | hdd_lro_info.tcp_ack_num = NBUF_CB_RX_TCP_ACK_NUM(skb); |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 641 | hdd_lro_info.tcp_data_csum = |
Houston Hoffman | 43d47fa | 2016-02-24 16:34:30 -0800 | [diff] [blame^] | 642 | csum_unfold(htons(NBUF_CB_RX_TCP_CHKSUM(skb))); |
| 643 | hdd_lro_info.tcp_seq_num = NBUF_CB_RX_TCP_SEQ_NUM(skb); |
| 644 | hdd_lro_info.tcp_win = NBUF_CB_RX_TCP_WIN(skb); |
Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame] | 645 | |
| 646 | lro_receive_skb_ext(adapter->lro_info.lro_mgr, skb, |
| 647 | (void *)adapter, &hdd_lro_info); |
| 648 | |
| 649 | if (!hdd_lro_info.lro_desc->active) |
| 650 | hdd_lro_desc_free(lro_desc, adapter); |
| 651 | |
| 652 | status = HDD_LRO_RX; |
| 653 | } else { |
| 654 | hdd_lro_flush_pkt(adapter->lro_info.lro_mgr, |
| 655 | iph, tcph, adapter); |
| 656 | } |
| 657 | } |
| 658 | return status; |
| 659 | } |