Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/net/ipv4/inet_lro.c |
| 3 | * |
| 4 | * Large Receive Offload (ipv4 / tcp) |
| 5 | * |
| 6 | * (C) Copyright IBM Corp. 2007 |
| 7 | * |
| 8 | * Authors: |
| 9 | * Jan-Bernd Themann <themann@de.ibm.com> |
| 10 | * Christoph Raisch <raisch@de.ibm.com> |
| 11 | * |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2, or (at your option) |
| 16 | * any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License |
| 24 | * along with this program; if not, write to the Free Software |
| 25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 26 | */ |
| 27 | |
| 28 | |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/if_vlan.h> |
| 31 | #include <linux/inet_lro.h> |
| 32 | |
| 33 | MODULE_LICENSE("GPL"); |
| 34 | MODULE_AUTHOR("Jan-Bernd Themann <themann@de.ibm.com>"); |
| 35 | MODULE_DESCRIPTION("Large Receive Offload (ipv4 / tcp)"); |
| 36 | |
| 37 | #define TCP_HDR_LEN(tcph) (tcph->doff << 2) |
| 38 | #define IP_HDR_LEN(iph) (iph->ihl << 2) |
| 39 | #define TCP_PAYLOAD_LENGTH(iph, tcph) \ |
| 40 | (ntohs(iph->tot_len) - IP_HDR_LEN(iph) - TCP_HDR_LEN(tcph)) |
| 41 | |
| 42 | #define IPH_LEN_WO_OPTIONS 5 |
| 43 | #define TCPH_LEN_WO_OPTIONS 5 |
| 44 | #define TCPH_LEN_W_TIMESTAMP 8 |
| 45 | |
| 46 | #define LRO_MAX_PG_HLEN 64 |
| 47 | |
| 48 | #define LRO_INC_STATS(lro_mgr, attr) { lro_mgr->stats.attr++; } |
| 49 | |
| 50 | /* |
| 51 | * Basic tcp checks whether packet is suitable for LRO |
| 52 | */ |
| 53 | |
| 54 | static int lro_tcp_ip_check(struct iphdr *iph, struct tcphdr *tcph, |
| 55 | int len, struct net_lro_desc *lro_desc) |
| 56 | { |
| 57 | /* check ip header: don't aggregate padded frames */ |
| 58 | if (ntohs(iph->tot_len) != len) |
| 59 | return -1; |
| 60 | |
| 61 | if (TCP_PAYLOAD_LENGTH(iph, tcph) == 0) |
| 62 | return -1; |
| 63 | |
| 64 | if (iph->ihl != IPH_LEN_WO_OPTIONS) |
| 65 | return -1; |
| 66 | |
| 67 | if (tcph->cwr || tcph->ece || tcph->urg || !tcph->ack |
| 68 | || tcph->rst || tcph->syn || tcph->fin) |
| 69 | return -1; |
| 70 | |
| 71 | if (INET_ECN_is_ce(ipv4_get_dsfield(iph))) |
| 72 | return -1; |
| 73 | |
| 74 | if (tcph->doff != TCPH_LEN_WO_OPTIONS |
| 75 | && tcph->doff != TCPH_LEN_W_TIMESTAMP) |
| 76 | return -1; |
| 77 | |
| 78 | /* check tcp options (only timestamp allowed) */ |
| 79 | if (tcph->doff == TCPH_LEN_W_TIMESTAMP) { |
Al Viro | 9df7c98 | 2007-10-14 19:40:59 +0100 | [diff] [blame] | 80 | __be32 *topt = (__be32 *)(tcph + 1); |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 81 | |
| 82 | if (*topt != htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
| 83 | | (TCPOPT_TIMESTAMP << 8) |
| 84 | | TCPOLEN_TIMESTAMP)) |
| 85 | return -1; |
| 86 | |
| 87 | /* timestamp should be in right order */ |
| 88 | topt++; |
| 89 | if (lro_desc && after(ntohl(lro_desc->tcp_rcv_tsval), |
| 90 | ntohl(*topt))) |
| 91 | return -1; |
| 92 | |
| 93 | /* timestamp reply should not be zero */ |
| 94 | topt++; |
| 95 | if (*topt == 0) |
| 96 | return -1; |
| 97 | } |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static void lro_update_tcp_ip_header(struct net_lro_desc *lro_desc) |
| 103 | { |
| 104 | struct iphdr *iph = lro_desc->iph; |
| 105 | struct tcphdr *tcph = lro_desc->tcph; |
Al Viro | 9df7c98 | 2007-10-14 19:40:59 +0100 | [diff] [blame] | 106 | __be32 *p; |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 107 | __wsum tcp_hdr_csum; |
| 108 | |
| 109 | tcph->ack_seq = lro_desc->tcp_ack; |
| 110 | tcph->window = lro_desc->tcp_window; |
| 111 | |
| 112 | if (lro_desc->tcp_saw_tstamp) { |
Al Viro | 9df7c98 | 2007-10-14 19:40:59 +0100 | [diff] [blame] | 113 | p = (__be32 *)(tcph + 1); |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 114 | *(p+2) = lro_desc->tcp_rcv_tsecr; |
| 115 | } |
| 116 | |
| 117 | iph->tot_len = htons(lro_desc->ip_tot_len); |
| 118 | |
| 119 | iph->check = 0; |
| 120 | iph->check = ip_fast_csum((u8 *)lro_desc->iph, iph->ihl); |
| 121 | |
| 122 | tcph->check = 0; |
| 123 | tcp_hdr_csum = csum_partial((u8 *)tcph, TCP_HDR_LEN(tcph), 0); |
| 124 | lro_desc->data_csum = csum_add(lro_desc->data_csum, tcp_hdr_csum); |
| 125 | tcph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, |
| 126 | lro_desc->ip_tot_len - |
| 127 | IP_HDR_LEN(iph), IPPROTO_TCP, |
| 128 | lro_desc->data_csum); |
| 129 | } |
| 130 | |
| 131 | static __wsum lro_tcp_data_csum(struct iphdr *iph, struct tcphdr *tcph, int len) |
| 132 | { |
| 133 | __wsum tcp_csum; |
| 134 | __wsum tcp_hdr_csum; |
| 135 | __wsum tcp_ps_hdr_csum; |
| 136 | |
| 137 | tcp_csum = ~csum_unfold(tcph->check); |
| 138 | tcp_hdr_csum = csum_partial((u8 *)tcph, TCP_HDR_LEN(tcph), tcp_csum); |
| 139 | |
| 140 | tcp_ps_hdr_csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, |
| 141 | len + TCP_HDR_LEN(tcph), |
| 142 | IPPROTO_TCP, 0); |
| 143 | |
| 144 | return csum_sub(csum_sub(tcp_csum, tcp_hdr_csum), |
| 145 | tcp_ps_hdr_csum); |
| 146 | } |
| 147 | |
| 148 | static void lro_init_desc(struct net_lro_desc *lro_desc, struct sk_buff *skb, |
| 149 | struct iphdr *iph, struct tcphdr *tcph, |
| 150 | u16 vlan_tag, struct vlan_group *vgrp) |
| 151 | { |
| 152 | int nr_frags; |
Al Viro | 9df7c98 | 2007-10-14 19:40:59 +0100 | [diff] [blame] | 153 | __be32 *ptr; |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 154 | u32 tcp_data_len = TCP_PAYLOAD_LENGTH(iph, tcph); |
| 155 | |
| 156 | nr_frags = skb_shinfo(skb)->nr_frags; |
| 157 | lro_desc->parent = skb; |
| 158 | lro_desc->next_frag = &(skb_shinfo(skb)->frags[nr_frags]); |
| 159 | lro_desc->iph = iph; |
| 160 | lro_desc->tcph = tcph; |
| 161 | lro_desc->tcp_next_seq = ntohl(tcph->seq) + tcp_data_len; |
Al Viro | f53f413 | 2007-10-14 19:41:09 +0100 | [diff] [blame] | 162 | lro_desc->tcp_ack = tcph->ack_seq; |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 163 | lro_desc->tcp_window = tcph->window; |
| 164 | |
| 165 | lro_desc->pkt_aggr_cnt = 1; |
| 166 | lro_desc->ip_tot_len = ntohs(iph->tot_len); |
| 167 | |
| 168 | if (tcph->doff == 8) { |
Al Viro | 9df7c98 | 2007-10-14 19:40:59 +0100 | [diff] [blame] | 169 | ptr = (__be32 *)(tcph+1); |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 170 | lro_desc->tcp_saw_tstamp = 1; |
| 171 | lro_desc->tcp_rcv_tsval = *(ptr+1); |
| 172 | lro_desc->tcp_rcv_tsecr = *(ptr+2); |
| 173 | } |
| 174 | |
| 175 | lro_desc->mss = tcp_data_len; |
| 176 | lro_desc->vgrp = vgrp; |
| 177 | lro_desc->vlan_tag = vlan_tag; |
| 178 | lro_desc->active = 1; |
| 179 | |
| 180 | lro_desc->data_csum = lro_tcp_data_csum(iph, tcph, |
| 181 | tcp_data_len); |
| 182 | } |
| 183 | |
| 184 | static inline void lro_clear_desc(struct net_lro_desc *lro_desc) |
| 185 | { |
| 186 | memset(lro_desc, 0, sizeof(struct net_lro_desc)); |
| 187 | } |
| 188 | |
| 189 | static void lro_add_common(struct net_lro_desc *lro_desc, struct iphdr *iph, |
| 190 | struct tcphdr *tcph, int tcp_data_len) |
| 191 | { |
| 192 | struct sk_buff *parent = lro_desc->parent; |
Al Viro | 9df7c98 | 2007-10-14 19:40:59 +0100 | [diff] [blame] | 193 | __be32 *topt; |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 194 | |
| 195 | lro_desc->pkt_aggr_cnt++; |
| 196 | lro_desc->ip_tot_len += tcp_data_len; |
| 197 | lro_desc->tcp_next_seq += tcp_data_len; |
| 198 | lro_desc->tcp_window = tcph->window; |
| 199 | lro_desc->tcp_ack = tcph->ack_seq; |
| 200 | |
| 201 | /* don't update tcp_rcv_tsval, would not work with PAWS */ |
| 202 | if (lro_desc->tcp_saw_tstamp) { |
Al Viro | 9df7c98 | 2007-10-14 19:40:59 +0100 | [diff] [blame] | 203 | topt = (__be32 *) (tcph + 1); |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 204 | lro_desc->tcp_rcv_tsecr = *(topt + 2); |
| 205 | } |
| 206 | |
| 207 | lro_desc->data_csum = csum_block_add(lro_desc->data_csum, |
| 208 | lro_tcp_data_csum(iph, tcph, |
| 209 | tcp_data_len), |
| 210 | parent->len); |
| 211 | |
| 212 | parent->len += tcp_data_len; |
| 213 | parent->data_len += tcp_data_len; |
| 214 | if (tcp_data_len > lro_desc->mss) |
| 215 | lro_desc->mss = tcp_data_len; |
| 216 | } |
| 217 | |
| 218 | static void lro_add_packet(struct net_lro_desc *lro_desc, struct sk_buff *skb, |
| 219 | struct iphdr *iph, struct tcphdr *tcph) |
| 220 | { |
| 221 | struct sk_buff *parent = lro_desc->parent; |
| 222 | int tcp_data_len = TCP_PAYLOAD_LENGTH(iph, tcph); |
| 223 | |
| 224 | lro_add_common(lro_desc, iph, tcph, tcp_data_len); |
| 225 | |
| 226 | skb_pull(skb, (skb->len - tcp_data_len)); |
| 227 | parent->truesize += skb->truesize; |
| 228 | |
| 229 | if (lro_desc->last_skb) |
| 230 | lro_desc->last_skb->next = skb; |
| 231 | else |
| 232 | skb_shinfo(parent)->frag_list = skb; |
| 233 | |
| 234 | lro_desc->last_skb = skb; |
| 235 | } |
| 236 | |
| 237 | static void lro_add_frags(struct net_lro_desc *lro_desc, |
| 238 | int len, int hlen, int truesize, |
| 239 | struct skb_frag_struct *skb_frags, |
| 240 | struct iphdr *iph, struct tcphdr *tcph) |
| 241 | { |
| 242 | struct sk_buff *skb = lro_desc->parent; |
| 243 | int tcp_data_len = TCP_PAYLOAD_LENGTH(iph, tcph); |
| 244 | |
| 245 | lro_add_common(lro_desc, iph, tcph, tcp_data_len); |
| 246 | |
| 247 | skb->truesize += truesize; |
| 248 | |
| 249 | skb_frags[0].page_offset += hlen; |
| 250 | skb_frags[0].size -= hlen; |
| 251 | |
| 252 | while (tcp_data_len > 0) { |
| 253 | *(lro_desc->next_frag) = *skb_frags; |
| 254 | tcp_data_len -= skb_frags->size; |
| 255 | lro_desc->next_frag++; |
| 256 | skb_frags++; |
| 257 | skb_shinfo(skb)->nr_frags++; |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | static int lro_check_tcp_conn(struct net_lro_desc *lro_desc, |
| 262 | struct iphdr *iph, |
| 263 | struct tcphdr *tcph) |
| 264 | { |
| 265 | if ((lro_desc->iph->saddr != iph->saddr) |
| 266 | || (lro_desc->iph->daddr != iph->daddr) |
| 267 | || (lro_desc->tcph->source != tcph->source) |
| 268 | || (lro_desc->tcph->dest != tcph->dest)) |
| 269 | return -1; |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | static struct net_lro_desc *lro_get_desc(struct net_lro_mgr *lro_mgr, |
| 274 | struct net_lro_desc *lro_arr, |
| 275 | struct iphdr *iph, |
| 276 | struct tcphdr *tcph) |
| 277 | { |
| 278 | struct net_lro_desc *lro_desc = NULL; |
| 279 | struct net_lro_desc *tmp; |
| 280 | int max_desc = lro_mgr->max_desc; |
| 281 | int i; |
| 282 | |
| 283 | for (i = 0; i < max_desc; i++) { |
| 284 | tmp = &lro_arr[i]; |
| 285 | if (tmp->active) |
| 286 | if (!lro_check_tcp_conn(tmp, iph, tcph)) { |
| 287 | lro_desc = tmp; |
| 288 | goto out; |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | for (i = 0; i < max_desc; i++) { |
| 293 | if (!lro_arr[i].active) { |
| 294 | lro_desc = &lro_arr[i]; |
| 295 | goto out; |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | LRO_INC_STATS(lro_mgr, no_desc); |
| 300 | out: |
| 301 | return lro_desc; |
| 302 | } |
| 303 | |
| 304 | static void lro_flush(struct net_lro_mgr *lro_mgr, |
| 305 | struct net_lro_desc *lro_desc) |
| 306 | { |
| 307 | if (lro_desc->pkt_aggr_cnt > 1) |
| 308 | lro_update_tcp_ip_header(lro_desc); |
| 309 | |
| 310 | skb_shinfo(lro_desc->parent)->gso_size = lro_desc->mss; |
| 311 | |
| 312 | if (lro_desc->vgrp) { |
Brice Goglin | 877364e | 2008-01-07 22:09:08 -0800 | [diff] [blame] | 313 | if (lro_mgr->features & LRO_F_NAPI) |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 314 | vlan_hwaccel_receive_skb(lro_desc->parent, |
| 315 | lro_desc->vgrp, |
| 316 | lro_desc->vlan_tag); |
| 317 | else |
| 318 | vlan_hwaccel_rx(lro_desc->parent, |
| 319 | lro_desc->vgrp, |
| 320 | lro_desc->vlan_tag); |
| 321 | |
| 322 | } else { |
Brice Goglin | 877364e | 2008-01-07 22:09:08 -0800 | [diff] [blame] | 323 | if (lro_mgr->features & LRO_F_NAPI) |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 324 | netif_receive_skb(lro_desc->parent); |
| 325 | else |
| 326 | netif_rx(lro_desc->parent); |
| 327 | } |
| 328 | |
| 329 | LRO_INC_STATS(lro_mgr, flushed); |
| 330 | lro_clear_desc(lro_desc); |
| 331 | } |
| 332 | |
| 333 | static int __lro_proc_skb(struct net_lro_mgr *lro_mgr, struct sk_buff *skb, |
| 334 | struct vlan_group *vgrp, u16 vlan_tag, void *priv) |
| 335 | { |
| 336 | struct net_lro_desc *lro_desc; |
| 337 | struct iphdr *iph; |
| 338 | struct tcphdr *tcph; |
| 339 | u64 flags; |
| 340 | int vlan_hdr_len = 0; |
| 341 | |
| 342 | if (!lro_mgr->get_skb_header |
| 343 | || lro_mgr->get_skb_header(skb, (void *)&iph, (void *)&tcph, |
| 344 | &flags, priv)) |
| 345 | goto out; |
| 346 | |
| 347 | if (!(flags & LRO_IPV4) || !(flags & LRO_TCP)) |
| 348 | goto out; |
| 349 | |
| 350 | lro_desc = lro_get_desc(lro_mgr, lro_mgr->lro_arr, iph, tcph); |
| 351 | if (!lro_desc) |
| 352 | goto out; |
| 353 | |
| 354 | if ((skb->protocol == htons(ETH_P_8021Q)) |
Brice Goglin | 877364e | 2008-01-07 22:09:08 -0800 | [diff] [blame] | 355 | && !(lro_mgr->features & LRO_F_EXTRACT_VLAN_ID)) |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 356 | vlan_hdr_len = VLAN_HLEN; |
| 357 | |
| 358 | if (!lro_desc->active) { /* start new lro session */ |
| 359 | if (lro_tcp_ip_check(iph, tcph, skb->len - vlan_hdr_len, NULL)) |
| 360 | goto out; |
| 361 | |
| 362 | skb->ip_summed = lro_mgr->ip_summed_aggr; |
| 363 | lro_init_desc(lro_desc, skb, iph, tcph, vlan_tag, vgrp); |
| 364 | LRO_INC_STATS(lro_mgr, aggregated); |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | if (lro_desc->tcp_next_seq != ntohl(tcph->seq)) |
| 369 | goto out2; |
| 370 | |
| 371 | if (lro_tcp_ip_check(iph, tcph, skb->len, lro_desc)) |
| 372 | goto out2; |
| 373 | |
| 374 | lro_add_packet(lro_desc, skb, iph, tcph); |
| 375 | LRO_INC_STATS(lro_mgr, aggregated); |
| 376 | |
| 377 | if ((lro_desc->pkt_aggr_cnt >= lro_mgr->max_aggr) || |
| 378 | lro_desc->parent->len > (0xFFFF - lro_mgr->dev->mtu)) |
| 379 | lro_flush(lro_mgr, lro_desc); |
| 380 | |
| 381 | return 0; |
| 382 | |
| 383 | out2: /* send aggregated SKBs to stack */ |
| 384 | lro_flush(lro_mgr, lro_desc); |
| 385 | |
Eli Cohen | 251a4b3 | 2008-06-27 20:09:00 -0700 | [diff] [blame^] | 386 | out: |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 387 | return 1; |
| 388 | } |
| 389 | |
| 390 | |
| 391 | static struct sk_buff *lro_gen_skb(struct net_lro_mgr *lro_mgr, |
| 392 | struct skb_frag_struct *frags, |
| 393 | int len, int true_size, |
| 394 | void *mac_hdr, |
| 395 | int hlen, __wsum sum, |
| 396 | u32 ip_summed) |
| 397 | { |
| 398 | struct sk_buff *skb; |
| 399 | struct skb_frag_struct *skb_frags; |
| 400 | int data_len = len; |
| 401 | int hdr_len = min(len, hlen); |
| 402 | |
Andrew Gallatin | 621544e | 2007-12-05 02:31:42 -0800 | [diff] [blame] | 403 | skb = netdev_alloc_skb(lro_mgr->dev, hlen + lro_mgr->frag_align_pad); |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 404 | if (!skb) |
| 405 | return NULL; |
| 406 | |
Andrew Gallatin | 621544e | 2007-12-05 02:31:42 -0800 | [diff] [blame] | 407 | skb_reserve(skb, lro_mgr->frag_align_pad); |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 408 | skb->len = len; |
| 409 | skb->data_len = len - hdr_len; |
| 410 | skb->truesize += true_size; |
| 411 | skb->tail += hdr_len; |
| 412 | |
| 413 | memcpy(skb->data, mac_hdr, hdr_len); |
| 414 | |
| 415 | skb_frags = skb_shinfo(skb)->frags; |
| 416 | while (data_len > 0) { |
| 417 | *skb_frags = *frags; |
| 418 | data_len -= frags->size; |
| 419 | skb_frags++; |
| 420 | frags++; |
| 421 | skb_shinfo(skb)->nr_frags++; |
| 422 | } |
| 423 | |
| 424 | skb_shinfo(skb)->frags[0].page_offset += hdr_len; |
| 425 | skb_shinfo(skb)->frags[0].size -= hdr_len; |
| 426 | |
| 427 | skb->ip_summed = ip_summed; |
| 428 | skb->csum = sum; |
| 429 | skb->protocol = eth_type_trans(skb, lro_mgr->dev); |
| 430 | return skb; |
| 431 | } |
| 432 | |
| 433 | static struct sk_buff *__lro_proc_segment(struct net_lro_mgr *lro_mgr, |
| 434 | struct skb_frag_struct *frags, |
| 435 | int len, int true_size, |
| 436 | struct vlan_group *vgrp, |
| 437 | u16 vlan_tag, void *priv, __wsum sum) |
| 438 | { |
| 439 | struct net_lro_desc *lro_desc; |
| 440 | struct iphdr *iph; |
| 441 | struct tcphdr *tcph; |
| 442 | struct sk_buff *skb; |
| 443 | u64 flags; |
| 444 | void *mac_hdr; |
| 445 | int mac_hdr_len; |
| 446 | int hdr_len = LRO_MAX_PG_HLEN; |
| 447 | int vlan_hdr_len = 0; |
| 448 | |
| 449 | if (!lro_mgr->get_frag_header |
| 450 | || lro_mgr->get_frag_header(frags, (void *)&mac_hdr, (void *)&iph, |
| 451 | (void *)&tcph, &flags, priv)) { |
| 452 | mac_hdr = page_address(frags->page) + frags->page_offset; |
| 453 | goto out1; |
| 454 | } |
| 455 | |
| 456 | if (!(flags & LRO_IPV4) || !(flags & LRO_TCP)) |
| 457 | goto out1; |
| 458 | |
| 459 | hdr_len = (int)((void *)(tcph) + TCP_HDR_LEN(tcph) - mac_hdr); |
| 460 | mac_hdr_len = (int)((void *)(iph) - mac_hdr); |
| 461 | |
| 462 | lro_desc = lro_get_desc(lro_mgr, lro_mgr->lro_arr, iph, tcph); |
| 463 | if (!lro_desc) |
| 464 | goto out1; |
| 465 | |
| 466 | if (!lro_desc->active) { /* start new lro session */ |
| 467 | if (lro_tcp_ip_check(iph, tcph, len - mac_hdr_len, NULL)) |
| 468 | goto out1; |
| 469 | |
| 470 | skb = lro_gen_skb(lro_mgr, frags, len, true_size, mac_hdr, |
| 471 | hdr_len, 0, lro_mgr->ip_summed_aggr); |
| 472 | if (!skb) |
| 473 | goto out; |
| 474 | |
| 475 | if ((skb->protocol == htons(ETH_P_8021Q)) |
Brice Goglin | 877364e | 2008-01-07 22:09:08 -0800 | [diff] [blame] | 476 | && !(lro_mgr->features & LRO_F_EXTRACT_VLAN_ID)) |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 477 | vlan_hdr_len = VLAN_HLEN; |
| 478 | |
| 479 | iph = (void *)(skb->data + vlan_hdr_len); |
| 480 | tcph = (void *)((u8 *)skb->data + vlan_hdr_len |
| 481 | + IP_HDR_LEN(iph)); |
| 482 | |
| 483 | lro_init_desc(lro_desc, skb, iph, tcph, 0, NULL); |
| 484 | LRO_INC_STATS(lro_mgr, aggregated); |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 485 | return NULL; |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 486 | } |
| 487 | |
| 488 | if (lro_desc->tcp_next_seq != ntohl(tcph->seq)) |
| 489 | goto out2; |
| 490 | |
| 491 | if (lro_tcp_ip_check(iph, tcph, len - mac_hdr_len, lro_desc)) |
| 492 | goto out2; |
| 493 | |
| 494 | lro_add_frags(lro_desc, len, hdr_len, true_size, frags, iph, tcph); |
| 495 | LRO_INC_STATS(lro_mgr, aggregated); |
| 496 | |
| 497 | if ((skb_shinfo(lro_desc->parent)->nr_frags >= lro_mgr->max_aggr) || |
| 498 | lro_desc->parent->len > (0xFFFF - lro_mgr->dev->mtu)) |
| 499 | lro_flush(lro_mgr, lro_desc); |
| 500 | |
| 501 | return NULL; |
| 502 | |
| 503 | out2: /* send aggregated packets to the stack */ |
| 504 | lro_flush(lro_mgr, lro_desc); |
| 505 | |
| 506 | out1: /* Original packet has to be posted to the stack */ |
| 507 | skb = lro_gen_skb(lro_mgr, frags, len, true_size, mac_hdr, |
| 508 | hdr_len, sum, lro_mgr->ip_summed); |
| 509 | out: |
| 510 | return skb; |
| 511 | } |
| 512 | |
| 513 | void lro_receive_skb(struct net_lro_mgr *lro_mgr, |
| 514 | struct sk_buff *skb, |
| 515 | void *priv) |
| 516 | { |
| 517 | if (__lro_proc_skb(lro_mgr, skb, NULL, 0, priv)) { |
Brice Goglin | 877364e | 2008-01-07 22:09:08 -0800 | [diff] [blame] | 518 | if (lro_mgr->features & LRO_F_NAPI) |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 519 | netif_receive_skb(skb); |
| 520 | else |
| 521 | netif_rx(skb); |
| 522 | } |
| 523 | } |
| 524 | EXPORT_SYMBOL(lro_receive_skb); |
| 525 | |
| 526 | void lro_vlan_hwaccel_receive_skb(struct net_lro_mgr *lro_mgr, |
| 527 | struct sk_buff *skb, |
| 528 | struct vlan_group *vgrp, |
| 529 | u16 vlan_tag, |
| 530 | void *priv) |
| 531 | { |
| 532 | if (__lro_proc_skb(lro_mgr, skb, vgrp, vlan_tag, priv)) { |
Brice Goglin | 877364e | 2008-01-07 22:09:08 -0800 | [diff] [blame] | 533 | if (lro_mgr->features & LRO_F_NAPI) |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 534 | vlan_hwaccel_receive_skb(skb, vgrp, vlan_tag); |
| 535 | else |
| 536 | vlan_hwaccel_rx(skb, vgrp, vlan_tag); |
| 537 | } |
| 538 | } |
| 539 | EXPORT_SYMBOL(lro_vlan_hwaccel_receive_skb); |
| 540 | |
| 541 | void lro_receive_frags(struct net_lro_mgr *lro_mgr, |
| 542 | struct skb_frag_struct *frags, |
| 543 | int len, int true_size, void *priv, __wsum sum) |
| 544 | { |
| 545 | struct sk_buff *skb; |
| 546 | |
| 547 | skb = __lro_proc_segment(lro_mgr, frags, len, true_size, NULL, 0, |
| 548 | priv, sum); |
| 549 | if (!skb) |
| 550 | return; |
| 551 | |
Brice Goglin | 877364e | 2008-01-07 22:09:08 -0800 | [diff] [blame] | 552 | if (lro_mgr->features & LRO_F_NAPI) |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 553 | netif_receive_skb(skb); |
| 554 | else |
| 555 | netif_rx(skb); |
| 556 | } |
| 557 | EXPORT_SYMBOL(lro_receive_frags); |
| 558 | |
| 559 | void lro_vlan_hwaccel_receive_frags(struct net_lro_mgr *lro_mgr, |
| 560 | struct skb_frag_struct *frags, |
| 561 | int len, int true_size, |
| 562 | struct vlan_group *vgrp, |
| 563 | u16 vlan_tag, void *priv, __wsum sum) |
| 564 | { |
| 565 | struct sk_buff *skb; |
| 566 | |
| 567 | skb = __lro_proc_segment(lro_mgr, frags, len, true_size, vgrp, |
| 568 | vlan_tag, priv, sum); |
| 569 | if (!skb) |
| 570 | return; |
| 571 | |
Brice Goglin | 877364e | 2008-01-07 22:09:08 -0800 | [diff] [blame] | 572 | if (lro_mgr->features & LRO_F_NAPI) |
Jan-Bernd Themann | 71c87e0 | 2007-08-08 22:38:05 -0700 | [diff] [blame] | 573 | vlan_hwaccel_receive_skb(skb, vgrp, vlan_tag); |
| 574 | else |
| 575 | vlan_hwaccel_rx(skb, vgrp, vlan_tag); |
| 576 | } |
| 577 | EXPORT_SYMBOL(lro_vlan_hwaccel_receive_frags); |
| 578 | |
| 579 | void lro_flush_all(struct net_lro_mgr *lro_mgr) |
| 580 | { |
| 581 | int i; |
| 582 | struct net_lro_desc *lro_desc = lro_mgr->lro_arr; |
| 583 | |
| 584 | for (i = 0; i < lro_mgr->max_desc; i++) { |
| 585 | if (lro_desc[i].active) |
| 586 | lro_flush(lro_mgr, &lro_desc[i]); |
| 587 | } |
| 588 | } |
| 589 | EXPORT_SYMBOL(lro_flush_all); |
| 590 | |
| 591 | void lro_flush_pkt(struct net_lro_mgr *lro_mgr, |
| 592 | struct iphdr *iph, struct tcphdr *tcph) |
| 593 | { |
| 594 | struct net_lro_desc *lro_desc; |
| 595 | |
| 596 | lro_desc = lro_get_desc(lro_mgr, lro_mgr->lro_arr, iph, tcph); |
| 597 | if (lro_desc->active) |
| 598 | lro_flush(lro_mgr, lro_desc); |
| 599 | } |
| 600 | EXPORT_SYMBOL(lro_flush_pkt); |