1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2013-2018, 2021, The Linux Foundation. All rights reserved. 3 * 4 * RMNET Data MAP protocol 5 */ 6 7 #include <linux/netdevice.h> 8 #include <linux/ip.h> 9 #include <linux/ipv6.h> 10 #include <net/ip6_checksum.h> 11 #include <linux/bitfield.h> 12 #include "rmnet_config.h" 13 #include "rmnet_map.h" 14 #include "rmnet_private.h" 15 #include "rmnet_vnd.h" 16 17 #define RMNET_MAP_DEAGGR_SPACING 64 18 #define RMNET_MAP_DEAGGR_HEADROOM (RMNET_MAP_DEAGGR_SPACING / 2) 19 20 static __sum16 *rmnet_map_get_csum_field(unsigned char protocol, 21 const void *txporthdr) 22 { 23 if (protocol == IPPROTO_TCP) 24 return &((struct tcphdr *)txporthdr)->check; 25 26 if (protocol == IPPROTO_UDP) 27 return &((struct udphdr *)txporthdr)->check; 28 29 return NULL; 30 } 31 32 static int 33 rmnet_map_ipv4_dl_csum_trailer(struct sk_buff *skb, 34 struct rmnet_map_dl_csum_trailer *csum_trailer, 35 struct rmnet_priv *priv) 36 { 37 struct iphdr *ip4h = (struct iphdr *)skb->data; 38 void *txporthdr = skb->data + ip4h->ihl * 4; 39 __sum16 *csum_field, pseudo_csum; 40 __sum16 ip_payload_csum; 41 42 /* Computing the checksum over just the IPv4 header--including its 43 * checksum field--should yield 0. If it doesn't, the IP header 44 * is bad, so return an error and let the IP layer drop it. 45 */ 46 if (ip_fast_csum(ip4h, ip4h->ihl)) { 47 priv->stats.csum_ip4_header_bad++; 48 return -EINVAL; 49 } 50 51 /* We don't support checksum offload on IPv4 fragments */ 52 if (ip_is_fragment(ip4h)) { 53 priv->stats.csum_fragmented_pkt++; 54 return -EOPNOTSUPP; 55 } 56 57 /* Checksum offload is only supported for UDP and TCP protocols */ 58 csum_field = rmnet_map_get_csum_field(ip4h->protocol, txporthdr); 59 if (!csum_field) { 60 priv->stats.csum_err_invalid_transport++; 61 return -EPROTONOSUPPORT; 62 } 63 64 /* RFC 768: UDP checksum is optional for IPv4, and is 0 if unused */ 65 if (!*csum_field && ip4h->protocol == IPPROTO_UDP) { 66 priv->stats.csum_skipped++; 67 return 0; 68 } 69 70 /* The checksum value in the trailer is computed over the entire 71 * IP packet, including the IP header and payload. To derive the 72 * transport checksum from this, we first subract the contribution 73 * of the IP header from the trailer checksum. We then add the 74 * checksum computed over the pseudo header. 75 * 76 * We verified above that the IP header contributes zero to the 77 * trailer checksum. Therefore the checksum in the trailer is 78 * just the checksum computed over the IP payload. 79 80 * If the IP payload arrives intact, adding the pseudo header 81 * checksum to the IP payload checksum will yield 0xffff (negative 82 * zero). This means the trailer checksum and the pseudo checksum 83 * are additive inverses of each other. Put another way, the 84 * message passes the checksum test if the trailer checksum value 85 * is the negated pseudo header checksum. 86 * 87 * Knowing this, we don't even need to examine the transport 88 * header checksum value; it is already accounted for in the 89 * checksum value found in the trailer. 90 */ 91 ip_payload_csum = csum_trailer->csum_value; 92 93 pseudo_csum = csum_tcpudp_magic(ip4h->saddr, ip4h->daddr, 94 ntohs(ip4h->tot_len) - ip4h->ihl * 4, 95 ip4h->protocol, 0); 96 97 /* The cast is required to ensure only the low 16 bits are examined */ 98 if (ip_payload_csum != (__sum16)~pseudo_csum) { 99 priv->stats.csum_validation_failed++; 100 return -EINVAL; 101 } 102 103 priv->stats.csum_ok++; 104 return 0; 105 } 106 107 #if IS_ENABLED(CONFIG_IPV6) 108 static int 109 rmnet_map_ipv6_dl_csum_trailer(struct sk_buff *skb, 110 struct rmnet_map_dl_csum_trailer *csum_trailer, 111 struct rmnet_priv *priv) 112 { 113 struct ipv6hdr *ip6h = (struct ipv6hdr *)skb->data; 114 void *txporthdr = skb->data + sizeof(*ip6h); 115 __sum16 *csum_field, pseudo_csum; 116 __sum16 ip6_payload_csum; 117 __be16 ip_header_csum; 118 119 /* Checksum offload is only supported for UDP and TCP protocols; 120 * the packet cannot include any IPv6 extension headers 121 */ 122 csum_field = rmnet_map_get_csum_field(ip6h->nexthdr, txporthdr); 123 if (!csum_field) { 124 priv->stats.csum_err_invalid_transport++; 125 return -EPROTONOSUPPORT; 126 } 127 128 /* The checksum value in the trailer is computed over the entire 129 * IP packet, including the IP header and payload. To derive the 130 * transport checksum from this, we first subract the contribution 131 * of the IP header from the trailer checksum. We then add the 132 * checksum computed over the pseudo header. 133 */ 134 ip_header_csum = (__force __be16)ip_fast_csum(ip6h, sizeof(*ip6h) / 4); 135 ip6_payload_csum = csum16_sub(csum_trailer->csum_value, ip_header_csum); 136 137 pseudo_csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 138 ntohs(ip6h->payload_len), 139 ip6h->nexthdr, 0); 140 141 /* It's sufficient to compare the IP payload checksum with the 142 * negated pseudo checksum to determine whether the packet 143 * checksum was good. (See further explanation in comments 144 * in rmnet_map_ipv4_dl_csum_trailer()). 145 * 146 * The cast is required to ensure only the low 16 bits are 147 * examined. 148 */ 149 if (ip6_payload_csum != (__sum16)~pseudo_csum) { 150 priv->stats.csum_validation_failed++; 151 return -EINVAL; 152 } 153 154 priv->stats.csum_ok++; 155 return 0; 156 } 157 #else 158 static int 159 rmnet_map_ipv6_dl_csum_trailer(struct sk_buff *skb, 160 struct rmnet_map_dl_csum_trailer *csum_trailer, 161 struct rmnet_priv *priv) 162 { 163 return 0; 164 } 165 #endif 166 167 static void rmnet_map_complement_ipv4_txporthdr_csum_field(struct iphdr *ip4h) 168 { 169 void *txphdr; 170 u16 *csum; 171 172 txphdr = (void *)ip4h + ip4h->ihl * 4; 173 174 if (ip4h->protocol == IPPROTO_TCP || ip4h->protocol == IPPROTO_UDP) { 175 csum = (u16 *)rmnet_map_get_csum_field(ip4h->protocol, txphdr); 176 *csum = ~(*csum); 177 } 178 } 179 180 static void 181 rmnet_map_ipv4_ul_csum_header(struct iphdr *iphdr, 182 struct rmnet_map_ul_csum_header *ul_header, 183 struct sk_buff *skb) 184 { 185 u16 val; 186 187 val = MAP_CSUM_UL_ENABLED_FLAG; 188 if (iphdr->protocol == IPPROTO_UDP) 189 val |= MAP_CSUM_UL_UDP_FLAG; 190 val |= skb->csum_offset & MAP_CSUM_UL_OFFSET_MASK; 191 192 ul_header->csum_start_offset = htons(skb_network_header_len(skb)); 193 ul_header->csum_info = htons(val); 194 195 skb->ip_summed = CHECKSUM_NONE; 196 197 rmnet_map_complement_ipv4_txporthdr_csum_field(iphdr); 198 } 199 200 #if IS_ENABLED(CONFIG_IPV6) 201 static void 202 rmnet_map_complement_ipv6_txporthdr_csum_field(struct ipv6hdr *ip6h) 203 { 204 void *txphdr; 205 u16 *csum; 206 207 txphdr = ip6h + 1; 208 209 if (ip6h->nexthdr == IPPROTO_TCP || ip6h->nexthdr == IPPROTO_UDP) { 210 csum = (u16 *)rmnet_map_get_csum_field(ip6h->nexthdr, txphdr); 211 *csum = ~(*csum); 212 } 213 } 214 215 static void 216 rmnet_map_ipv6_ul_csum_header(struct ipv6hdr *ipv6hdr, 217 struct rmnet_map_ul_csum_header *ul_header, 218 struct sk_buff *skb) 219 { 220 u16 val; 221 222 val = MAP_CSUM_UL_ENABLED_FLAG; 223 if (ipv6hdr->nexthdr == IPPROTO_UDP) 224 val |= MAP_CSUM_UL_UDP_FLAG; 225 val |= skb->csum_offset & MAP_CSUM_UL_OFFSET_MASK; 226 227 ul_header->csum_start_offset = htons(skb_network_header_len(skb)); 228 ul_header->csum_info = htons(val); 229 230 skb->ip_summed = CHECKSUM_NONE; 231 232 rmnet_map_complement_ipv6_txporthdr_csum_field(ipv6hdr); 233 } 234 #else 235 static void 236 rmnet_map_ipv6_ul_csum_header(void *ip6hdr, 237 struct rmnet_map_ul_csum_header *ul_header, 238 struct sk_buff *skb) 239 { 240 } 241 #endif 242 243 static void rmnet_map_v5_checksum_uplink_packet(struct sk_buff *skb, 244 struct rmnet_port *port, 245 struct net_device *orig_dev) 246 { 247 struct rmnet_priv *priv = netdev_priv(orig_dev); 248 struct rmnet_map_v5_csum_header *ul_header; 249 250 ul_header = skb_push(skb, sizeof(*ul_header)); 251 memset(ul_header, 0, sizeof(*ul_header)); 252 ul_header->header_info = u8_encode_bits(RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD, 253 MAPV5_HDRINFO_HDR_TYPE_FMASK); 254 255 if (skb->ip_summed == CHECKSUM_PARTIAL) { 256 void *iph = ip_hdr(skb); 257 __sum16 *check; 258 void *trans; 259 u8 proto; 260 261 if (skb->protocol == htons(ETH_P_IP)) { 262 u16 ip_len = ((struct iphdr *)iph)->ihl * 4; 263 264 proto = ((struct iphdr *)iph)->protocol; 265 trans = iph + ip_len; 266 } else if (IS_ENABLED(CONFIG_IPV6) && 267 skb->protocol == htons(ETH_P_IPV6)) { 268 u16 ip_len = sizeof(struct ipv6hdr); 269 270 proto = ((struct ipv6hdr *)iph)->nexthdr; 271 trans = iph + ip_len; 272 } else { 273 priv->stats.csum_err_invalid_ip_version++; 274 goto sw_csum; 275 } 276 277 check = rmnet_map_get_csum_field(proto, trans); 278 if (check) { 279 skb->ip_summed = CHECKSUM_NONE; 280 /* Ask for checksum offloading */ 281 ul_header->csum_info |= MAPV5_CSUMINFO_VALID_FLAG; 282 priv->stats.csum_hw++; 283 return; 284 } 285 } 286 287 sw_csum: 288 priv->stats.csum_sw++; 289 } 290 291 /* Adds MAP header to front of skb->data 292 * Padding is calculated and set appropriately in MAP header. Mux ID is 293 * initialized to 0. 294 */ 295 struct rmnet_map_header *rmnet_map_add_map_header(struct sk_buff *skb, 296 int hdrlen, 297 struct rmnet_port *port, 298 int pad) 299 { 300 struct rmnet_map_header *map_header; 301 u32 padding, map_datalen; 302 303 map_datalen = skb->len - hdrlen; 304 map_header = (struct rmnet_map_header *) 305 skb_push(skb, sizeof(struct rmnet_map_header)); 306 memset(map_header, 0, sizeof(struct rmnet_map_header)); 307 308 /* Set next_hdr bit for csum offload packets */ 309 if (port->data_format & RMNET_FLAGS_EGRESS_MAP_CKSUMV5) 310 map_header->flags |= MAP_NEXT_HEADER_FLAG; 311 312 if (pad == RMNET_MAP_NO_PAD_BYTES) { 313 map_header->pkt_len = htons(map_datalen); 314 return map_header; 315 } 316 317 BUILD_BUG_ON(MAP_PAD_LEN_MASK < 3); 318 padding = ALIGN(map_datalen, 4) - map_datalen; 319 320 if (padding == 0) 321 goto done; 322 323 if (skb_tailroom(skb) < padding) 324 return NULL; 325 326 skb_put_zero(skb, padding); 327 328 done: 329 map_header->pkt_len = htons(map_datalen + padding); 330 /* This is a data packet, so the CMD bit is 0 */ 331 map_header->flags = padding & MAP_PAD_LEN_MASK; 332 333 return map_header; 334 } 335 336 u32 rmnet_map_validate_packet_len(struct sk_buff *skb, struct rmnet_port *port) 337 { 338 struct rmnet_map_v5_csum_header *next_hdr = NULL; 339 struct rmnet_map_header *maph; 340 void *data = skb->data; 341 u32 packet_len; 342 343 if (skb->len < sizeof(*maph)) 344 return 0; 345 346 maph = (struct rmnet_map_header *)skb->data; 347 348 /* Some hardware can send us empty frames. Catch them */ 349 if (!maph->pkt_len) 350 return 0; 351 352 packet_len = ntohs(maph->pkt_len) + sizeof(*maph); 353 354 if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4) { 355 packet_len += sizeof(struct rmnet_map_dl_csum_trailer); 356 } else if ((port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV5) && 357 !(maph->flags & MAP_CMD_FLAG)) { 358 /* Mapv5 data pkt without csum hdr is invalid */ 359 if (!(maph->flags & MAP_NEXT_HEADER_FLAG)) 360 return 0; 361 362 packet_len += sizeof(*next_hdr); 363 next_hdr = data + sizeof(*maph); 364 } 365 366 if (skb->len < packet_len) 367 return 0; 368 369 if (next_hdr && 370 u8_get_bits(next_hdr->header_info, MAPV5_HDRINFO_HDR_TYPE_FMASK) != 371 RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD) 372 return 0; 373 374 return packet_len; 375 } 376 377 /* Deaggregates a single packet 378 * A whole new buffer is allocated for each portion of an aggregated frame. 379 * Caller should keep calling deaggregate() on the source skb until 0 is 380 * returned, indicating that there are no more packets to deaggregate. Caller 381 * is responsible for freeing the original skb. 382 */ 383 struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb, 384 struct rmnet_port *port) 385 { 386 struct sk_buff *skbn; 387 u32 packet_len; 388 389 packet_len = rmnet_map_validate_packet_len(skb, port); 390 if (!packet_len) 391 return NULL; 392 393 skbn = alloc_skb(packet_len + RMNET_MAP_DEAGGR_SPACING, GFP_ATOMIC); 394 if (!skbn) 395 return NULL; 396 397 skb_reserve(skbn, RMNET_MAP_DEAGGR_HEADROOM); 398 skb_put(skbn, packet_len); 399 memcpy(skbn->data, skb->data, packet_len); 400 skb_pull(skb, packet_len); 401 402 return skbn; 403 } 404 405 /* Validates packet checksums. Function takes a pointer to 406 * the beginning of a buffer which contains the IP payload + 407 * padding + checksum trailer. 408 * Only IPv4 and IPv6 are supported along with TCP & UDP. 409 * Fragmented or tunneled packets are not supported. 410 */ 411 int rmnet_map_checksum_downlink_packet(struct sk_buff *skb, u16 len) 412 { 413 struct rmnet_priv *priv = netdev_priv(skb->dev); 414 struct rmnet_map_dl_csum_trailer *csum_trailer; 415 416 if (unlikely(!(skb->dev->features & NETIF_F_RXCSUM))) { 417 priv->stats.csum_sw++; 418 return -EOPNOTSUPP; 419 } 420 421 csum_trailer = (struct rmnet_map_dl_csum_trailer *)(skb->data + len); 422 423 if (!(csum_trailer->flags & MAP_CSUM_DL_VALID_FLAG)) { 424 priv->stats.csum_valid_unset++; 425 return -EINVAL; 426 } 427 428 if (skb->protocol == htons(ETH_P_IP)) 429 return rmnet_map_ipv4_dl_csum_trailer(skb, csum_trailer, priv); 430 431 if (IS_ENABLED(CONFIG_IPV6) && skb->protocol == htons(ETH_P_IPV6)) 432 return rmnet_map_ipv6_dl_csum_trailer(skb, csum_trailer, priv); 433 434 priv->stats.csum_err_invalid_ip_version++; 435 436 return -EPROTONOSUPPORT; 437 } 438 439 static void rmnet_map_v4_checksum_uplink_packet(struct sk_buff *skb, 440 struct net_device *orig_dev) 441 { 442 struct rmnet_priv *priv = netdev_priv(orig_dev); 443 struct rmnet_map_ul_csum_header *ul_header; 444 void *iphdr; 445 446 ul_header = (struct rmnet_map_ul_csum_header *) 447 skb_push(skb, sizeof(struct rmnet_map_ul_csum_header)); 448 449 if (unlikely(!(orig_dev->features & 450 (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))) 451 goto sw_csum; 452 453 if (skb->ip_summed != CHECKSUM_PARTIAL) 454 goto sw_csum; 455 456 iphdr = (char *)ul_header + 457 sizeof(struct rmnet_map_ul_csum_header); 458 459 if (skb->protocol == htons(ETH_P_IP)) { 460 rmnet_map_ipv4_ul_csum_header(iphdr, ul_header, skb); 461 priv->stats.csum_hw++; 462 return; 463 } 464 465 if (IS_ENABLED(CONFIG_IPV6) && skb->protocol == htons(ETH_P_IPV6)) { 466 rmnet_map_ipv6_ul_csum_header(iphdr, ul_header, skb); 467 priv->stats.csum_hw++; 468 return; 469 } 470 471 priv->stats.csum_err_invalid_ip_version++; 472 473 sw_csum: 474 memset(ul_header, 0, sizeof(*ul_header)); 475 476 priv->stats.csum_sw++; 477 } 478 479 /* Generates UL checksum meta info header for IPv4 and IPv6 over TCP and UDP 480 * packets that are supported for UL checksum offload. 481 */ 482 void rmnet_map_checksum_uplink_packet(struct sk_buff *skb, 483 struct rmnet_port *port, 484 struct net_device *orig_dev, 485 int csum_type) 486 { 487 switch (csum_type) { 488 case RMNET_FLAGS_EGRESS_MAP_CKSUMV4: 489 rmnet_map_v4_checksum_uplink_packet(skb, orig_dev); 490 break; 491 case RMNET_FLAGS_EGRESS_MAP_CKSUMV5: 492 rmnet_map_v5_checksum_uplink_packet(skb, port, orig_dev); 493 break; 494 default: 495 break; 496 } 497 } 498 499 /* Process a MAPv5 packet header */ 500 int rmnet_map_process_next_hdr_packet(struct sk_buff *skb, 501 u16 len) 502 { 503 struct rmnet_priv *priv = netdev_priv(skb->dev); 504 struct rmnet_map_v5_csum_header *next_hdr; 505 u8 nexthdr_type; 506 507 next_hdr = (struct rmnet_map_v5_csum_header *)(skb->data + 508 sizeof(struct rmnet_map_header)); 509 510 nexthdr_type = u8_get_bits(next_hdr->header_info, 511 MAPV5_HDRINFO_HDR_TYPE_FMASK); 512 513 if (nexthdr_type != RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD) 514 return -EINVAL; 515 516 if (unlikely(!(skb->dev->features & NETIF_F_RXCSUM))) { 517 priv->stats.csum_sw++; 518 } else if (next_hdr->csum_info & MAPV5_CSUMINFO_VALID_FLAG) { 519 priv->stats.csum_ok++; 520 skb->ip_summed = CHECKSUM_UNNECESSARY; 521 } else { 522 priv->stats.csum_valid_unset++; 523 } 524 525 /* Pull csum v5 header */ 526 skb_pull(skb, sizeof(*next_hdr)); 527 528 return 0; 529 } 530 531 #define RMNET_AGG_BYPASS_TIME_NSEC 10000000L 532 533 static void reset_aggr_params(struct rmnet_port *port) 534 { 535 port->skbagg_head = NULL; 536 port->agg_count = 0; 537 port->agg_state = 0; 538 memset(&port->agg_time, 0, sizeof(struct timespec64)); 539 } 540 541 static void rmnet_send_skb(struct rmnet_port *port, struct sk_buff *skb) 542 { 543 if (skb_needs_linearize(skb, port->dev->features)) { 544 if (unlikely(__skb_linearize(skb))) { 545 struct rmnet_priv *priv; 546 547 priv = netdev_priv(port->rmnet_dev); 548 this_cpu_inc(priv->pcpu_stats->stats.tx_drops); 549 dev_kfree_skb_any(skb); 550 return; 551 } 552 } 553 554 dev_queue_xmit(skb); 555 } 556 557 static void rmnet_map_flush_tx_packet_work(struct work_struct *work) 558 { 559 struct sk_buff *skb = NULL; 560 struct rmnet_port *port; 561 562 port = container_of(work, struct rmnet_port, agg_wq); 563 564 spin_lock_bh(&port->agg_lock); 565 if (likely(port->agg_state == -EINPROGRESS)) { 566 /* Buffer may have already been shipped out */ 567 if (likely(port->skbagg_head)) { 568 skb = port->skbagg_head; 569 reset_aggr_params(port); 570 } 571 port->agg_state = 0; 572 } 573 574 spin_unlock_bh(&port->agg_lock); 575 if (skb) 576 rmnet_send_skb(port, skb); 577 } 578 579 static enum hrtimer_restart rmnet_map_flush_tx_packet_queue(struct hrtimer *t) 580 { 581 struct rmnet_port *port; 582 583 port = container_of(t, struct rmnet_port, hrtimer); 584 585 schedule_work(&port->agg_wq); 586 587 return HRTIMER_NORESTART; 588 } 589 590 unsigned int rmnet_map_tx_aggregate(struct sk_buff *skb, struct rmnet_port *port, 591 struct net_device *orig_dev) 592 { 593 struct timespec64 diff, last; 594 unsigned int len = skb->len; 595 struct sk_buff *agg_skb; 596 int size; 597 598 spin_lock_bh(&port->agg_lock); 599 memcpy(&last, &port->agg_last, sizeof(struct timespec64)); 600 ktime_get_real_ts64(&port->agg_last); 601 602 if (!port->skbagg_head) { 603 /* Check to see if we should agg first. If the traffic is very 604 * sparse, don't aggregate. 605 */ 606 new_packet: 607 diff = timespec64_sub(port->agg_last, last); 608 size = port->egress_agg_params.bytes - skb->len; 609 610 if (size < 0) { 611 /* dropped */ 612 spin_unlock_bh(&port->agg_lock); 613 return 0; 614 } 615 616 if (diff.tv_sec > 0 || diff.tv_nsec > RMNET_AGG_BYPASS_TIME_NSEC || 617 size == 0) 618 goto no_aggr; 619 620 port->skbagg_head = skb_copy_expand(skb, 0, size, GFP_ATOMIC); 621 if (!port->skbagg_head) 622 goto no_aggr; 623 624 dev_kfree_skb_any(skb); 625 port->skbagg_head->protocol = htons(ETH_P_MAP); 626 port->agg_count = 1; 627 ktime_get_real_ts64(&port->agg_time); 628 skb_frag_list_init(port->skbagg_head); 629 goto schedule; 630 } 631 diff = timespec64_sub(port->agg_last, port->agg_time); 632 size = port->egress_agg_params.bytes - port->skbagg_head->len; 633 634 if (skb->len > size) { 635 agg_skb = port->skbagg_head; 636 reset_aggr_params(port); 637 spin_unlock_bh(&port->agg_lock); 638 hrtimer_cancel(&port->hrtimer); 639 rmnet_send_skb(port, agg_skb); 640 spin_lock_bh(&port->agg_lock); 641 goto new_packet; 642 } 643 644 if (skb_has_frag_list(port->skbagg_head)) 645 port->skbagg_tail->next = skb; 646 else 647 skb_shinfo(port->skbagg_head)->frag_list = skb; 648 649 port->skbagg_head->len += skb->len; 650 port->skbagg_head->data_len += skb->len; 651 port->skbagg_head->truesize += skb->truesize; 652 port->skbagg_tail = skb; 653 port->agg_count++; 654 655 if (diff.tv_sec > 0 || diff.tv_nsec > port->egress_agg_params.time_nsec || 656 port->agg_count >= port->egress_agg_params.count || 657 port->skbagg_head->len == port->egress_agg_params.bytes) { 658 agg_skb = port->skbagg_head; 659 reset_aggr_params(port); 660 spin_unlock_bh(&port->agg_lock); 661 hrtimer_cancel(&port->hrtimer); 662 rmnet_send_skb(port, agg_skb); 663 return len; 664 } 665 666 schedule: 667 if (!hrtimer_active(&port->hrtimer) && port->agg_state != -EINPROGRESS) { 668 port->agg_state = -EINPROGRESS; 669 hrtimer_start(&port->hrtimer, 670 ns_to_ktime(port->egress_agg_params.time_nsec), 671 HRTIMER_MODE_REL); 672 } 673 spin_unlock_bh(&port->agg_lock); 674 675 return len; 676 677 no_aggr: 678 spin_unlock_bh(&port->agg_lock); 679 skb->protocol = htons(ETH_P_MAP); 680 dev_queue_xmit(skb); 681 682 return len; 683 } 684 685 void rmnet_map_update_ul_agg_config(struct rmnet_port *port, u32 size, 686 u32 count, u32 time) 687 { 688 spin_lock_bh(&port->agg_lock); 689 port->egress_agg_params.bytes = size; 690 WRITE_ONCE(port->egress_agg_params.count, count); 691 port->egress_agg_params.time_nsec = time * NSEC_PER_USEC; 692 spin_unlock_bh(&port->agg_lock); 693 } 694 695 void rmnet_map_tx_aggregate_init(struct rmnet_port *port) 696 { 697 hrtimer_setup(&port->hrtimer, rmnet_map_flush_tx_packet_queue, CLOCK_MONOTONIC, 698 HRTIMER_MODE_REL); 699 spin_lock_init(&port->agg_lock); 700 rmnet_map_update_ul_agg_config(port, 4096, 1, 800); 701 INIT_WORK(&port->agg_wq, rmnet_map_flush_tx_packet_work); 702 } 703 704 void rmnet_map_tx_aggregate_exit(struct rmnet_port *port) 705 { 706 hrtimer_cancel(&port->hrtimer); 707 cancel_work_sync(&port->agg_wq); 708 709 spin_lock_bh(&port->agg_lock); 710 if (port->agg_state == -EINPROGRESS) { 711 if (port->skbagg_head) { 712 dev_kfree_skb_any(port->skbagg_head); 713 reset_aggr_params(port); 714 } 715 716 port->agg_state = 0; 717 } 718 spin_unlock_bh(&port->agg_lock); 719 } 720