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 20static __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 32static int 33rmnet_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) 108static int 109rmnet_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 158static int 159rmnet_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 167static 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 180static void 181rmnet_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) 201static void 202rmnet_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 215static void 216rmnet_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 235static void 236rmnet_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 243static 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 287sw_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 */ 295struct 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 328done: 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/* Deaggregates a single packet 337 * A whole new buffer is allocated for each portion of an aggregated frame. 338 * Caller should keep calling deaggregate() on the source skb until 0 is 339 * returned, indicating that there are no more packets to deaggregate. Caller 340 * is responsible for freeing the original skb. 341 */ 342struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb, 343 struct rmnet_port *port) 344{ 345 struct rmnet_map_v5_csum_header *next_hdr = NULL; 346 struct rmnet_map_header *maph; 347 void *data = skb->data; 348 struct sk_buff *skbn; 349 u8 nexthdr_type; 350 u32 packet_len; 351 352 if (skb->len == 0) 353 return NULL; 354 355 maph = (struct rmnet_map_header *)skb->data; 356 packet_len = ntohs(maph->pkt_len) + sizeof(*maph); 357 358 if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4) { 359 packet_len += sizeof(struct rmnet_map_dl_csum_trailer); 360 } else if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV5) { 361 if (!(maph->flags & MAP_CMD_FLAG)) { 362 packet_len += sizeof(*next_hdr); 363 if (maph->flags & MAP_NEXT_HEADER_FLAG) 364 next_hdr = data + sizeof(*maph); 365 else 366 /* Mapv5 data pkt without csum hdr is invalid */ 367 return NULL; 368 } 369 } 370 371 if (((int)skb->len - (int)packet_len) < 0) 372 return NULL; 373 374 /* Some hardware can send us empty frames. Catch them */ 375 if (!maph->pkt_len) 376 return NULL; 377 378 if (next_hdr) { 379 nexthdr_type = u8_get_bits(next_hdr->header_info, 380 MAPV5_HDRINFO_HDR_TYPE_FMASK); 381 if (nexthdr_type != RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD) 382 return NULL; 383 } 384 385 skbn = alloc_skb(packet_len + RMNET_MAP_DEAGGR_SPACING, GFP_ATOMIC); 386 if (!skbn) 387 return NULL; 388 389 skb_reserve(skbn, RMNET_MAP_DEAGGR_HEADROOM); 390 skb_put(skbn, packet_len); 391 memcpy(skbn->data, skb->data, packet_len); 392 skb_pull(skb, packet_len); 393 394 return skbn; 395} 396 397/* Validates packet checksums. Function takes a pointer to 398 * the beginning of a buffer which contains the IP payload + 399 * padding + checksum trailer. 400 * Only IPv4 and IPv6 are supported along with TCP & UDP. 401 * Fragmented or tunneled packets are not supported. 402 */ 403int rmnet_map_checksum_downlink_packet(struct sk_buff *skb, u16 len) 404{ 405 struct rmnet_priv *priv = netdev_priv(skb->dev); 406 struct rmnet_map_dl_csum_trailer *csum_trailer; 407 408 if (unlikely(!(skb->dev->features & NETIF_F_RXCSUM))) { 409 priv->stats.csum_sw++; 410 return -EOPNOTSUPP; 411 } 412 413 csum_trailer = (struct rmnet_map_dl_csum_trailer *)(skb->data + len); 414 415 if (!(csum_trailer->flags & MAP_CSUM_DL_VALID_FLAG)) { 416 priv->stats.csum_valid_unset++; 417 return -EINVAL; 418 } 419 420 if (skb->protocol == htons(ETH_P_IP)) 421 return rmnet_map_ipv4_dl_csum_trailer(skb, csum_trailer, priv); 422 423 if (IS_ENABLED(CONFIG_IPV6) && skb->protocol == htons(ETH_P_IPV6)) 424 return rmnet_map_ipv6_dl_csum_trailer(skb, csum_trailer, priv); 425 426 priv->stats.csum_err_invalid_ip_version++; 427 428 return -EPROTONOSUPPORT; 429} 430 431static void rmnet_map_v4_checksum_uplink_packet(struct sk_buff *skb, 432 struct net_device *orig_dev) 433{ 434 struct rmnet_priv *priv = netdev_priv(orig_dev); 435 struct rmnet_map_ul_csum_header *ul_header; 436 void *iphdr; 437 438 ul_header = (struct rmnet_map_ul_csum_header *) 439 skb_push(skb, sizeof(struct rmnet_map_ul_csum_header)); 440 441 if (unlikely(!(orig_dev->features & 442 (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))) 443 goto sw_csum; 444 445 if (skb->ip_summed != CHECKSUM_PARTIAL) 446 goto sw_csum; 447 448 iphdr = (char *)ul_header + 449 sizeof(struct rmnet_map_ul_csum_header); 450 451 if (skb->protocol == htons(ETH_P_IP)) { 452 rmnet_map_ipv4_ul_csum_header(iphdr, ul_header, skb); 453 priv->stats.csum_hw++; 454 return; 455 } 456 457 if (IS_ENABLED(CONFIG_IPV6) && skb->protocol == htons(ETH_P_IPV6)) { 458 rmnet_map_ipv6_ul_csum_header(iphdr, ul_header, skb); 459 priv->stats.csum_hw++; 460 return; 461 } 462 463 priv->stats.csum_err_invalid_ip_version++; 464 465sw_csum: 466 memset(ul_header, 0, sizeof(*ul_header)); 467 468 priv->stats.csum_sw++; 469} 470 471/* Generates UL checksum meta info header for IPv4 and IPv6 over TCP and UDP 472 * packets that are supported for UL checksum offload. 473 */ 474void rmnet_map_checksum_uplink_packet(struct sk_buff *skb, 475 struct rmnet_port *port, 476 struct net_device *orig_dev, 477 int csum_type) 478{ 479 switch (csum_type) { 480 case RMNET_FLAGS_EGRESS_MAP_CKSUMV4: 481 rmnet_map_v4_checksum_uplink_packet(skb, orig_dev); 482 break; 483 case RMNET_FLAGS_EGRESS_MAP_CKSUMV5: 484 rmnet_map_v5_checksum_uplink_packet(skb, port, orig_dev); 485 break; 486 default: 487 break; 488 } 489} 490 491/* Process a MAPv5 packet header */ 492int rmnet_map_process_next_hdr_packet(struct sk_buff *skb, 493 u16 len) 494{ 495 struct rmnet_priv *priv = netdev_priv(skb->dev); 496 struct rmnet_map_v5_csum_header *next_hdr; 497 u8 nexthdr_type; 498 499 next_hdr = (struct rmnet_map_v5_csum_header *)(skb->data + 500 sizeof(struct rmnet_map_header)); 501 502 nexthdr_type = u8_get_bits(next_hdr->header_info, 503 MAPV5_HDRINFO_HDR_TYPE_FMASK); 504 505 if (nexthdr_type != RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD) 506 return -EINVAL; 507 508 if (unlikely(!(skb->dev->features & NETIF_F_RXCSUM))) { 509 priv->stats.csum_sw++; 510 } else if (next_hdr->csum_info & MAPV5_CSUMINFO_VALID_FLAG) { 511 priv->stats.csum_ok++; 512 skb->ip_summed = CHECKSUM_UNNECESSARY; 513 } else { 514 priv->stats.csum_valid_unset++; 515 } 516 517 /* Pull csum v5 header */ 518 skb_pull(skb, sizeof(*next_hdr)); 519 520 return 0; 521} 522 523#define RMNET_AGG_BYPASS_TIME_NSEC 10000000L 524 525static void reset_aggr_params(struct rmnet_port *port) 526{ 527 port->skbagg_head = NULL; 528 port->agg_count = 0; 529 port->agg_state = 0; 530 memset(&port->agg_time, 0, sizeof(struct timespec64)); 531} 532 533static void rmnet_send_skb(struct rmnet_port *port, struct sk_buff *skb) 534{ 535 if (skb_needs_linearize(skb, port->dev->features)) { 536 if (unlikely(__skb_linearize(skb))) { 537 struct rmnet_priv *priv; 538 539 priv = netdev_priv(port->rmnet_dev); 540 this_cpu_inc(priv->pcpu_stats->stats.tx_drops); 541 dev_kfree_skb_any(skb); 542 return; 543 } 544 } 545 546 dev_queue_xmit(skb); 547} 548 549static void rmnet_map_flush_tx_packet_work(struct work_struct *work) 550{ 551 struct sk_buff *skb = NULL; 552 struct rmnet_port *port; 553 554 port = container_of(work, struct rmnet_port, agg_wq); 555 556 spin_lock_bh(&port->agg_lock); 557 if (likely(port->agg_state == -EINPROGRESS)) { 558 /* Buffer may have already been shipped out */ 559 if (likely(port->skbagg_head)) { 560 skb = port->skbagg_head; 561 reset_aggr_params(port); 562 } 563 port->agg_state = 0; 564 } 565 566 spin_unlock_bh(&port->agg_lock); 567 if (skb) 568 rmnet_send_skb(port, skb); 569} 570 571static enum hrtimer_restart rmnet_map_flush_tx_packet_queue(struct hrtimer *t) 572{ 573 struct rmnet_port *port; 574 575 port = container_of(t, struct rmnet_port, hrtimer); 576 577 schedule_work(&port->agg_wq); 578 579 return HRTIMER_NORESTART; 580} 581 582unsigned int rmnet_map_tx_aggregate(struct sk_buff *skb, struct rmnet_port *port, 583 struct net_device *orig_dev) 584{ 585 struct timespec64 diff, last; 586 unsigned int len = skb->len; 587 struct sk_buff *agg_skb; 588 int size; 589 590 spin_lock_bh(&port->agg_lock); 591 memcpy(&last, &port->agg_last, sizeof(struct timespec64)); 592 ktime_get_real_ts64(&port->agg_last); 593 594 if (!port->skbagg_head) { 595 /* Check to see if we should agg first. If the traffic is very 596 * sparse, don't aggregate. 597 */ 598new_packet: 599 diff = timespec64_sub(port->agg_last, last); 600 size = port->egress_agg_params.bytes - skb->len; 601 602 if (size < 0) { 603 /* dropped */ 604 spin_unlock_bh(&port->agg_lock); 605 return 0; 606 } 607 608 if (diff.tv_sec > 0 || diff.tv_nsec > RMNET_AGG_BYPASS_TIME_NSEC || 609 size == 0) 610 goto no_aggr; 611 612 port->skbagg_head = skb_copy_expand(skb, 0, size, GFP_ATOMIC); 613 if (!port->skbagg_head) 614 goto no_aggr; 615 616 dev_kfree_skb_any(skb); 617 port->skbagg_head->protocol = htons(ETH_P_MAP); 618 port->agg_count = 1; 619 ktime_get_real_ts64(&port->agg_time); 620 skb_frag_list_init(port->skbagg_head); 621 goto schedule; 622 } 623 diff = timespec64_sub(port->agg_last, port->agg_time); 624 size = port->egress_agg_params.bytes - port->skbagg_head->len; 625 626 if (skb->len > size) { 627 agg_skb = port->skbagg_head; 628 reset_aggr_params(port); 629 spin_unlock_bh(&port->agg_lock); 630 hrtimer_cancel(&port->hrtimer); 631 rmnet_send_skb(port, agg_skb); 632 spin_lock_bh(&port->agg_lock); 633 goto new_packet; 634 } 635 636 if (skb_has_frag_list(port->skbagg_head)) 637 port->skbagg_tail->next = skb; 638 else 639 skb_shinfo(port->skbagg_head)->frag_list = skb; 640 641 port->skbagg_head->len += skb->len; 642 port->skbagg_head->data_len += skb->len; 643 port->skbagg_head->truesize += skb->truesize; 644 port->skbagg_tail = skb; 645 port->agg_count++; 646 647 if (diff.tv_sec > 0 || diff.tv_nsec > port->egress_agg_params.time_nsec || 648 port->agg_count >= port->egress_agg_params.count || 649 port->skbagg_head->len == port->egress_agg_params.bytes) { 650 agg_skb = port->skbagg_head; 651 reset_aggr_params(port); 652 spin_unlock_bh(&port->agg_lock); 653 hrtimer_cancel(&port->hrtimer); 654 rmnet_send_skb(port, agg_skb); 655 return len; 656 } 657 658schedule: 659 if (!hrtimer_active(&port->hrtimer) && port->agg_state != -EINPROGRESS) { 660 port->agg_state = -EINPROGRESS; 661 hrtimer_start(&port->hrtimer, 662 ns_to_ktime(port->egress_agg_params.time_nsec), 663 HRTIMER_MODE_REL); 664 } 665 spin_unlock_bh(&port->agg_lock); 666 667 return len; 668 669no_aggr: 670 spin_unlock_bh(&port->agg_lock); 671 skb->protocol = htons(ETH_P_MAP); 672 dev_queue_xmit(skb); 673 674 return len; 675} 676 677void rmnet_map_update_ul_agg_config(struct rmnet_port *port, u32 size, 678 u32 count, u32 time) 679{ 680 spin_lock_bh(&port->agg_lock); 681 port->egress_agg_params.bytes = size; 682 WRITE_ONCE(port->egress_agg_params.count, count); 683 port->egress_agg_params.time_nsec = time * NSEC_PER_USEC; 684 spin_unlock_bh(&port->agg_lock); 685} 686 687void rmnet_map_tx_aggregate_init(struct rmnet_port *port) 688{ 689 hrtimer_init(&port->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 690 port->hrtimer.function = rmnet_map_flush_tx_packet_queue; 691 spin_lock_init(&port->agg_lock); 692 rmnet_map_update_ul_agg_config(port, 4096, 1, 800); 693 INIT_WORK(&port->agg_wq, rmnet_map_flush_tx_packet_work); 694} 695 696void rmnet_map_tx_aggregate_exit(struct rmnet_port *port) 697{ 698 hrtimer_cancel(&port->hrtimer); 699 cancel_work_sync(&port->agg_wq); 700 701 spin_lock_bh(&port->agg_lock); 702 if (port->agg_state == -EINPROGRESS) { 703 if (port->skbagg_head) { 704 dev_kfree_skb_any(port->skbagg_head); 705 reset_aggr_params(port); 706 } 707 708 port->agg_state = 0; 709 } 710 spin_unlock_bh(&port->agg_lock); 711} 712