1 /* QLogic qede NIC Driver 2 * Copyright (c) 2015-2017 QLogic Corporation 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and /or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 #include <linux/netdevice.h> 33 #include <linux/etherdevice.h> 34 #include <linux/skbuff.h> 35 #include <linux/bpf_trace.h> 36 #include <net/udp_tunnel.h> 37 #include <linux/ip.h> 38 #include <net/ipv6.h> 39 #include <net/tcp.h> 40 #include <linux/if_ether.h> 41 #include <linux/if_vlan.h> 42 #include <net/ip6_checksum.h> 43 #include "qede_ptp.h" 44 45 #include <linux/qed/qed_if.h> 46 #include "qede.h" 47 /********************************* 48 * Content also used by slowpath * 49 *********************************/ 50 51 int qede_alloc_rx_buffer(struct qede_rx_queue *rxq, bool allow_lazy) 52 { 53 struct sw_rx_data *sw_rx_data; 54 struct eth_rx_bd *rx_bd; 55 dma_addr_t mapping; 56 struct page *data; 57 58 /* In case lazy-allocation is allowed, postpone allocation until the 59 * end of the NAPI run. We'd still need to make sure the Rx ring has 60 * sufficient buffers to guarantee an additional Rx interrupt. 61 */ 62 if (allow_lazy && likely(rxq->filled_buffers > 12)) { 63 rxq->filled_buffers--; 64 return 0; 65 } 66 67 data = alloc_pages(GFP_ATOMIC, 0); 68 if (unlikely(!data)) 69 return -ENOMEM; 70 71 /* Map the entire page as it would be used 72 * for multiple RX buffer segment size mapping. 73 */ 74 mapping = dma_map_page(rxq->dev, data, 0, 75 PAGE_SIZE, rxq->data_direction); 76 if (unlikely(dma_mapping_error(rxq->dev, mapping))) { 77 __free_page(data); 78 return -ENOMEM; 79 } 80 81 sw_rx_data = &rxq->sw_rx_ring[rxq->sw_rx_prod & NUM_RX_BDS_MAX]; 82 sw_rx_data->page_offset = 0; 83 sw_rx_data->data = data; 84 sw_rx_data->mapping = mapping; 85 86 /* Advance PROD and get BD pointer */ 87 rx_bd = (struct eth_rx_bd *)qed_chain_produce(&rxq->rx_bd_ring); 88 WARN_ON(!rx_bd); 89 rx_bd->addr.hi = cpu_to_le32(upper_32_bits(mapping)); 90 rx_bd->addr.lo = cpu_to_le32(lower_32_bits(mapping) + 91 rxq->rx_headroom); 92 93 rxq->sw_rx_prod++; 94 rxq->filled_buffers++; 95 96 return 0; 97 } 98 99 /* Unmap the data and free skb */ 100 int qede_free_tx_pkt(struct qede_dev *edev, struct qede_tx_queue *txq, int *len) 101 { 102 u16 idx = txq->sw_tx_cons; 103 struct sk_buff *skb = txq->sw_tx_ring.skbs[idx].skb; 104 struct eth_tx_1st_bd *first_bd; 105 struct eth_tx_bd *tx_data_bd; 106 int bds_consumed = 0; 107 int nbds; 108 bool data_split = txq->sw_tx_ring.skbs[idx].flags & QEDE_TSO_SPLIT_BD; 109 int i, split_bd_len = 0; 110 111 if (unlikely(!skb)) { 112 DP_ERR(edev, 113 "skb is null for txq idx=%d txq->sw_tx_cons=%d txq->sw_tx_prod=%d\n", 114 idx, txq->sw_tx_cons, txq->sw_tx_prod); 115 return -1; 116 } 117 118 *len = skb->len; 119 120 first_bd = (struct eth_tx_1st_bd *)qed_chain_consume(&txq->tx_pbl); 121 122 bds_consumed++; 123 124 nbds = first_bd->data.nbds; 125 126 if (data_split) { 127 struct eth_tx_bd *split = (struct eth_tx_bd *) 128 qed_chain_consume(&txq->tx_pbl); 129 split_bd_len = BD_UNMAP_LEN(split); 130 bds_consumed++; 131 } 132 dma_unmap_single(&edev->pdev->dev, BD_UNMAP_ADDR(first_bd), 133 BD_UNMAP_LEN(first_bd) + split_bd_len, DMA_TO_DEVICE); 134 135 /* Unmap the data of the skb frags */ 136 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++, bds_consumed++) { 137 tx_data_bd = (struct eth_tx_bd *) 138 qed_chain_consume(&txq->tx_pbl); 139 dma_unmap_page(&edev->pdev->dev, BD_UNMAP_ADDR(tx_data_bd), 140 BD_UNMAP_LEN(tx_data_bd), DMA_TO_DEVICE); 141 } 142 143 while (bds_consumed++ < nbds) 144 qed_chain_consume(&txq->tx_pbl); 145 146 /* Free skb */ 147 dev_kfree_skb_any(skb); 148 txq->sw_tx_ring.skbs[idx].skb = NULL; 149 txq->sw_tx_ring.skbs[idx].flags = 0; 150 151 return 0; 152 } 153 154 /* Unmap the data and free skb when mapping failed during start_xmit */ 155 static void qede_free_failed_tx_pkt(struct qede_tx_queue *txq, 156 struct eth_tx_1st_bd *first_bd, 157 int nbd, bool data_split) 158 { 159 u16 idx = txq->sw_tx_prod; 160 struct sk_buff *skb = txq->sw_tx_ring.skbs[idx].skb; 161 struct eth_tx_bd *tx_data_bd; 162 int i, split_bd_len = 0; 163 164 /* Return prod to its position before this skb was handled */ 165 qed_chain_set_prod(&txq->tx_pbl, 166 le16_to_cpu(txq->tx_db.data.bd_prod), first_bd); 167 168 first_bd = (struct eth_tx_1st_bd *)qed_chain_produce(&txq->tx_pbl); 169 170 if (data_split) { 171 struct eth_tx_bd *split = (struct eth_tx_bd *) 172 qed_chain_produce(&txq->tx_pbl); 173 split_bd_len = BD_UNMAP_LEN(split); 174 nbd--; 175 } 176 177 dma_unmap_single(txq->dev, BD_UNMAP_ADDR(first_bd), 178 BD_UNMAP_LEN(first_bd) + split_bd_len, DMA_TO_DEVICE); 179 180 /* Unmap the data of the skb frags */ 181 for (i = 0; i < nbd; i++) { 182 tx_data_bd = (struct eth_tx_bd *) 183 qed_chain_produce(&txq->tx_pbl); 184 if (tx_data_bd->nbytes) 185 dma_unmap_page(txq->dev, 186 BD_UNMAP_ADDR(tx_data_bd), 187 BD_UNMAP_LEN(tx_data_bd), DMA_TO_DEVICE); 188 } 189 190 /* Return again prod to its position before this skb was handled */ 191 qed_chain_set_prod(&txq->tx_pbl, 192 le16_to_cpu(txq->tx_db.data.bd_prod), first_bd); 193 194 /* Free skb */ 195 dev_kfree_skb_any(skb); 196 txq->sw_tx_ring.skbs[idx].skb = NULL; 197 txq->sw_tx_ring.skbs[idx].flags = 0; 198 } 199 200 static u32 qede_xmit_type(struct sk_buff *skb, int *ipv6_ext) 201 { 202 u32 rc = XMIT_L4_CSUM; 203 __be16 l3_proto; 204 205 if (skb->ip_summed != CHECKSUM_PARTIAL) 206 return XMIT_PLAIN; 207 208 l3_proto = vlan_get_protocol(skb); 209 if (l3_proto == htons(ETH_P_IPV6) && 210 (ipv6_hdr(skb)->nexthdr == NEXTHDR_IPV6)) 211 *ipv6_ext = 1; 212 213 if (skb->encapsulation) { 214 rc |= XMIT_ENC; 215 if (skb_is_gso(skb)) { 216 unsigned short gso_type = skb_shinfo(skb)->gso_type; 217 218 if ((gso_type & SKB_GSO_UDP_TUNNEL_CSUM) || 219 (gso_type & SKB_GSO_GRE_CSUM)) 220 rc |= XMIT_ENC_GSO_L4_CSUM; 221 222 rc |= XMIT_LSO; 223 return rc; 224 } 225 } 226 227 if (skb_is_gso(skb)) 228 rc |= XMIT_LSO; 229 230 return rc; 231 } 232 233 static void qede_set_params_for_ipv6_ext(struct sk_buff *skb, 234 struct eth_tx_2nd_bd *second_bd, 235 struct eth_tx_3rd_bd *third_bd) 236 { 237 u8 l4_proto; 238 u16 bd2_bits1 = 0, bd2_bits2 = 0; 239 240 bd2_bits1 |= (1 << ETH_TX_DATA_2ND_BD_IPV6_EXT_SHIFT); 241 242 bd2_bits2 |= ((((u8 *)skb_transport_header(skb) - skb->data) >> 1) & 243 ETH_TX_DATA_2ND_BD_L4_HDR_START_OFFSET_W_MASK) 244 << ETH_TX_DATA_2ND_BD_L4_HDR_START_OFFSET_W_SHIFT; 245 246 bd2_bits1 |= (ETH_L4_PSEUDO_CSUM_CORRECT_LENGTH << 247 ETH_TX_DATA_2ND_BD_L4_PSEUDO_CSUM_MODE_SHIFT); 248 249 if (vlan_get_protocol(skb) == htons(ETH_P_IPV6)) 250 l4_proto = ipv6_hdr(skb)->nexthdr; 251 else 252 l4_proto = ip_hdr(skb)->protocol; 253 254 if (l4_proto == IPPROTO_UDP) 255 bd2_bits1 |= 1 << ETH_TX_DATA_2ND_BD_L4_UDP_SHIFT; 256 257 if (third_bd) 258 third_bd->data.bitfields |= 259 cpu_to_le16(((tcp_hdrlen(skb) / 4) & 260 ETH_TX_DATA_3RD_BD_TCP_HDR_LEN_DW_MASK) << 261 ETH_TX_DATA_3RD_BD_TCP_HDR_LEN_DW_SHIFT); 262 263 second_bd->data.bitfields1 = cpu_to_le16(bd2_bits1); 264 second_bd->data.bitfields2 = cpu_to_le16(bd2_bits2); 265 } 266 267 static int map_frag_to_bd(struct qede_tx_queue *txq, 268 skb_frag_t *frag, struct eth_tx_bd *bd) 269 { 270 dma_addr_t mapping; 271 272 /* Map skb non-linear frag data for DMA */ 273 mapping = skb_frag_dma_map(txq->dev, frag, 0, 274 skb_frag_size(frag), DMA_TO_DEVICE); 275 if (unlikely(dma_mapping_error(txq->dev, mapping))) 276 return -ENOMEM; 277 278 /* Setup the data pointer of the frag data */ 279 BD_SET_UNMAP_ADDR_LEN(bd, mapping, skb_frag_size(frag)); 280 281 return 0; 282 } 283 284 static u16 qede_get_skb_hlen(struct sk_buff *skb, bool is_encap_pkt) 285 { 286 if (is_encap_pkt) 287 return (skb_inner_transport_header(skb) + 288 inner_tcp_hdrlen(skb) - skb->data); 289 else 290 return (skb_transport_header(skb) + 291 tcp_hdrlen(skb) - skb->data); 292 } 293 294 /* +2 for 1st BD for headers and 2nd BD for headlen (if required) */ 295 #if ((MAX_SKB_FRAGS + 2) > ETH_TX_MAX_BDS_PER_NON_LSO_PACKET) 296 static bool qede_pkt_req_lin(struct sk_buff *skb, u8 xmit_type) 297 { 298 int allowed_frags = ETH_TX_MAX_BDS_PER_NON_LSO_PACKET - 1; 299 300 if (xmit_type & XMIT_LSO) { 301 int hlen; 302 303 hlen = qede_get_skb_hlen(skb, xmit_type & XMIT_ENC); 304 305 /* linear payload would require its own BD */ 306 if (skb_headlen(skb) > hlen) 307 allowed_frags--; 308 } 309 310 return (skb_shinfo(skb)->nr_frags > allowed_frags); 311 } 312 #endif 313 314 static inline void qede_update_tx_producer(struct qede_tx_queue *txq) 315 { 316 /* wmb makes sure that the BDs data is updated before updating the 317 * producer, otherwise FW may read old data from the BDs. 318 */ 319 wmb(); 320 barrier(); 321 writel(txq->tx_db.raw, txq->doorbell_addr); 322 323 /* Fence required to flush the write combined buffer, since another 324 * CPU may write to the same doorbell address and data may be lost 325 * due to relaxed order nature of write combined bar. 326 */ 327 wmb(); 328 } 329 330 static int qede_xdp_xmit(struct qede_dev *edev, struct qede_fastpath *fp, 331 struct sw_rx_data *metadata, u16 padding, u16 length) 332 { 333 struct qede_tx_queue *txq = fp->xdp_tx; 334 struct eth_tx_1st_bd *first_bd; 335 u16 idx = txq->sw_tx_prod; 336 u16 val; 337 338 if (!qed_chain_get_elem_left(&txq->tx_pbl)) { 339 txq->stopped_cnt++; 340 return -ENOMEM; 341 } 342 343 first_bd = (struct eth_tx_1st_bd *)qed_chain_produce(&txq->tx_pbl); 344 345 memset(first_bd, 0, sizeof(*first_bd)); 346 first_bd->data.bd_flags.bitfields = 347 BIT(ETH_TX_1ST_BD_FLAGS_START_BD_SHIFT); 348 349 val = (length & ETH_TX_DATA_1ST_BD_PKT_LEN_MASK) << 350 ETH_TX_DATA_1ST_BD_PKT_LEN_SHIFT; 351 352 first_bd->data.bitfields |= cpu_to_le16(val); 353 first_bd->data.nbds = 1; 354 355 /* We can safely ignore the offset, as it's 0 for XDP */ 356 BD_SET_UNMAP_ADDR_LEN(first_bd, metadata->mapping + padding, length); 357 358 /* Synchronize the buffer back to device, as program [probably] 359 * has changed it. 360 */ 361 dma_sync_single_for_device(&edev->pdev->dev, 362 metadata->mapping + padding, 363 length, PCI_DMA_TODEVICE); 364 365 txq->sw_tx_ring.xdp[idx].page = metadata->data; 366 txq->sw_tx_ring.xdp[idx].mapping = metadata->mapping; 367 txq->sw_tx_prod = (txq->sw_tx_prod + 1) % txq->num_tx_buffers; 368 369 /* Mark the fastpath for future XDP doorbell */ 370 fp->xdp_xmit = 1; 371 372 return 0; 373 } 374 375 int qede_txq_has_work(struct qede_tx_queue *txq) 376 { 377 u16 hw_bd_cons; 378 379 /* Tell compiler that consumer and producer can change */ 380 barrier(); 381 hw_bd_cons = le16_to_cpu(*txq->hw_cons_ptr); 382 if (qed_chain_get_cons_idx(&txq->tx_pbl) == hw_bd_cons + 1) 383 return 0; 384 385 return hw_bd_cons != qed_chain_get_cons_idx(&txq->tx_pbl); 386 } 387 388 static void qede_xdp_tx_int(struct qede_dev *edev, struct qede_tx_queue *txq) 389 { 390 u16 hw_bd_cons, idx; 391 392 hw_bd_cons = le16_to_cpu(*txq->hw_cons_ptr); 393 barrier(); 394 395 while (hw_bd_cons != qed_chain_get_cons_idx(&txq->tx_pbl)) { 396 qed_chain_consume(&txq->tx_pbl); 397 idx = txq->sw_tx_cons; 398 399 dma_unmap_page(&edev->pdev->dev, 400 txq->sw_tx_ring.xdp[idx].mapping, 401 PAGE_SIZE, DMA_BIDIRECTIONAL); 402 __free_page(txq->sw_tx_ring.xdp[idx].page); 403 404 txq->sw_tx_cons = (txq->sw_tx_cons + 1) % txq->num_tx_buffers; 405 txq->xmit_pkts++; 406 } 407 } 408 409 static int qede_tx_int(struct qede_dev *edev, struct qede_tx_queue *txq) 410 { 411 unsigned int pkts_compl = 0, bytes_compl = 0; 412 struct netdev_queue *netdev_txq; 413 u16 hw_bd_cons; 414 int rc; 415 416 netdev_txq = netdev_get_tx_queue(edev->ndev, txq->ndev_txq_id); 417 418 hw_bd_cons = le16_to_cpu(*txq->hw_cons_ptr); 419 barrier(); 420 421 while (hw_bd_cons != qed_chain_get_cons_idx(&txq->tx_pbl)) { 422 int len = 0; 423 424 rc = qede_free_tx_pkt(edev, txq, &len); 425 if (rc) { 426 DP_NOTICE(edev, "hw_bd_cons = %d, chain_cons=%d\n", 427 hw_bd_cons, 428 qed_chain_get_cons_idx(&txq->tx_pbl)); 429 break; 430 } 431 432 bytes_compl += len; 433 pkts_compl++; 434 txq->sw_tx_cons = (txq->sw_tx_cons + 1) % txq->num_tx_buffers; 435 txq->xmit_pkts++; 436 } 437 438 netdev_tx_completed_queue(netdev_txq, pkts_compl, bytes_compl); 439 440 /* Need to make the tx_bd_cons update visible to start_xmit() 441 * before checking for netif_tx_queue_stopped(). Without the 442 * memory barrier, there is a small possibility that 443 * start_xmit() will miss it and cause the queue to be stopped 444 * forever. 445 * On the other hand we need an rmb() here to ensure the proper 446 * ordering of bit testing in the following 447 * netif_tx_queue_stopped(txq) call. 448 */ 449 smp_mb(); 450 451 if (unlikely(netif_tx_queue_stopped(netdev_txq))) { 452 /* Taking tx_lock is needed to prevent reenabling the queue 453 * while it's empty. This could have happen if rx_action() gets 454 * suspended in qede_tx_int() after the condition before 455 * netif_tx_wake_queue(), while tx_action (qede_start_xmit()): 456 * 457 * stops the queue->sees fresh tx_bd_cons->releases the queue-> 458 * sends some packets consuming the whole queue again-> 459 * stops the queue 460 */ 461 462 __netif_tx_lock(netdev_txq, smp_processor_id()); 463 464 if ((netif_tx_queue_stopped(netdev_txq)) && 465 (edev->state == QEDE_STATE_OPEN) && 466 (qed_chain_get_elem_left(&txq->tx_pbl) 467 >= (MAX_SKB_FRAGS + 1))) { 468 netif_tx_wake_queue(netdev_txq); 469 DP_VERBOSE(edev, NETIF_MSG_TX_DONE, 470 "Wake queue was called\n"); 471 } 472 473 __netif_tx_unlock(netdev_txq); 474 } 475 476 return 0; 477 } 478 479 bool qede_has_rx_work(struct qede_rx_queue *rxq) 480 { 481 u16 hw_comp_cons, sw_comp_cons; 482 483 /* Tell compiler that status block fields can change */ 484 barrier(); 485 486 hw_comp_cons = le16_to_cpu(*rxq->hw_cons_ptr); 487 sw_comp_cons = qed_chain_get_cons_idx(&rxq->rx_comp_ring); 488 489 return hw_comp_cons != sw_comp_cons; 490 } 491 492 static inline void qede_rx_bd_ring_consume(struct qede_rx_queue *rxq) 493 { 494 qed_chain_consume(&rxq->rx_bd_ring); 495 rxq->sw_rx_cons++; 496 } 497 498 /* This function reuses the buffer(from an offset) from 499 * consumer index to producer index in the bd ring 500 */ 501 static inline void qede_reuse_page(struct qede_rx_queue *rxq, 502 struct sw_rx_data *curr_cons) 503 { 504 struct eth_rx_bd *rx_bd_prod = qed_chain_produce(&rxq->rx_bd_ring); 505 struct sw_rx_data *curr_prod; 506 dma_addr_t new_mapping; 507 508 curr_prod = &rxq->sw_rx_ring[rxq->sw_rx_prod & NUM_RX_BDS_MAX]; 509 *curr_prod = *curr_cons; 510 511 new_mapping = curr_prod->mapping + curr_prod->page_offset; 512 513 rx_bd_prod->addr.hi = cpu_to_le32(upper_32_bits(new_mapping)); 514 rx_bd_prod->addr.lo = cpu_to_le32(lower_32_bits(new_mapping) + 515 rxq->rx_headroom); 516 517 rxq->sw_rx_prod++; 518 curr_cons->data = NULL; 519 } 520 521 /* In case of allocation failures reuse buffers 522 * from consumer index to produce buffers for firmware 523 */ 524 void qede_recycle_rx_bd_ring(struct qede_rx_queue *rxq, u8 count) 525 { 526 struct sw_rx_data *curr_cons; 527 528 for (; count > 0; count--) { 529 curr_cons = &rxq->sw_rx_ring[rxq->sw_rx_cons & NUM_RX_BDS_MAX]; 530 qede_reuse_page(rxq, curr_cons); 531 qede_rx_bd_ring_consume(rxq); 532 } 533 } 534 535 static inline int qede_realloc_rx_buffer(struct qede_rx_queue *rxq, 536 struct sw_rx_data *curr_cons) 537 { 538 /* Move to the next segment in the page */ 539 curr_cons->page_offset += rxq->rx_buf_seg_size; 540 541 if (curr_cons->page_offset == PAGE_SIZE) { 542 if (unlikely(qede_alloc_rx_buffer(rxq, true))) { 543 /* Since we failed to allocate new buffer 544 * current buffer can be used again. 545 */ 546 curr_cons->page_offset -= rxq->rx_buf_seg_size; 547 548 return -ENOMEM; 549 } 550 551 dma_unmap_page(rxq->dev, curr_cons->mapping, 552 PAGE_SIZE, rxq->data_direction); 553 } else { 554 /* Increment refcount of the page as we don't want 555 * network stack to take the ownership of the page 556 * which can be recycled multiple times by the driver. 557 */ 558 page_ref_inc(curr_cons->data); 559 qede_reuse_page(rxq, curr_cons); 560 } 561 562 return 0; 563 } 564 565 void qede_update_rx_prod(struct qede_dev *edev, struct qede_rx_queue *rxq) 566 { 567 u16 bd_prod = qed_chain_get_prod_idx(&rxq->rx_bd_ring); 568 u16 cqe_prod = qed_chain_get_prod_idx(&rxq->rx_comp_ring); 569 struct eth_rx_prod_data rx_prods = {0}; 570 571 /* Update producers */ 572 rx_prods.bd_prod = cpu_to_le16(bd_prod); 573 rx_prods.cqe_prod = cpu_to_le16(cqe_prod); 574 575 /* Make sure that the BD and SGE data is updated before updating the 576 * producers since FW might read the BD/SGE right after the producer 577 * is updated. 578 */ 579 wmb(); 580 581 internal_ram_wr(rxq->hw_rxq_prod_addr, sizeof(rx_prods), 582 (u32 *)&rx_prods); 583 584 /* mmiowb is needed to synchronize doorbell writes from more than one 585 * processor. It guarantees that the write arrives to the device before 586 * the napi lock is released and another qede_poll is called (possibly 587 * on another CPU). Without this barrier, the next doorbell can bypass 588 * this doorbell. This is applicable to IA64/Altix systems. 589 */ 590 mmiowb(); 591 } 592 593 static void qede_get_rxhash(struct sk_buff *skb, u8 bitfields, __le32 rss_hash) 594 { 595 enum pkt_hash_types hash_type = PKT_HASH_TYPE_NONE; 596 enum rss_hash_type htype; 597 u32 hash = 0; 598 599 htype = GET_FIELD(bitfields, ETH_FAST_PATH_RX_REG_CQE_RSS_HASH_TYPE); 600 if (htype) { 601 hash_type = ((htype == RSS_HASH_TYPE_IPV4) || 602 (htype == RSS_HASH_TYPE_IPV6)) ? 603 PKT_HASH_TYPE_L3 : PKT_HASH_TYPE_L4; 604 hash = le32_to_cpu(rss_hash); 605 } 606 skb_set_hash(skb, hash, hash_type); 607 } 608 609 static void qede_set_skb_csum(struct sk_buff *skb, u8 csum_flag) 610 { 611 skb_checksum_none_assert(skb); 612 613 if (csum_flag & QEDE_CSUM_UNNECESSARY) 614 skb->ip_summed = CHECKSUM_UNNECESSARY; 615 616 if (csum_flag & QEDE_TUNN_CSUM_UNNECESSARY) { 617 skb->csum_level = 1; 618 skb->encapsulation = 1; 619 } 620 } 621 622 static inline void qede_skb_receive(struct qede_dev *edev, 623 struct qede_fastpath *fp, 624 struct qede_rx_queue *rxq, 625 struct sk_buff *skb, u16 vlan_tag) 626 { 627 if (vlan_tag) 628 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag); 629 630 napi_gro_receive(&fp->napi, skb); 631 } 632 633 static void qede_set_gro_params(struct qede_dev *edev, 634 struct sk_buff *skb, 635 struct eth_fast_path_rx_tpa_start_cqe *cqe) 636 { 637 u16 parsing_flags = le16_to_cpu(cqe->pars_flags.flags); 638 639 if (((parsing_flags >> PARSING_AND_ERR_FLAGS_L3TYPE_SHIFT) & 640 PARSING_AND_ERR_FLAGS_L3TYPE_MASK) == 2) 641 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; 642 else 643 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; 644 645 skb_shinfo(skb)->gso_size = __le16_to_cpu(cqe->len_on_first_bd) - 646 cqe->header_len; 647 } 648 649 static int qede_fill_frag_skb(struct qede_dev *edev, 650 struct qede_rx_queue *rxq, 651 u8 tpa_agg_index, u16 len_on_bd) 652 { 653 struct sw_rx_data *current_bd = &rxq->sw_rx_ring[rxq->sw_rx_cons & 654 NUM_RX_BDS_MAX]; 655 struct qede_agg_info *tpa_info = &rxq->tpa_info[tpa_agg_index]; 656 struct sk_buff *skb = tpa_info->skb; 657 658 if (unlikely(tpa_info->state != QEDE_AGG_STATE_START)) 659 goto out; 660 661 /* Add one frag and update the appropriate fields in the skb */ 662 skb_fill_page_desc(skb, tpa_info->frag_id++, 663 current_bd->data, 664 current_bd->page_offset + rxq->rx_headroom, 665 len_on_bd); 666 667 if (unlikely(qede_realloc_rx_buffer(rxq, current_bd))) { 668 /* Incr page ref count to reuse on allocation failure 669 * so that it doesn't get freed while freeing SKB. 670 */ 671 page_ref_inc(current_bd->data); 672 goto out; 673 } 674 675 qede_rx_bd_ring_consume(rxq); 676 677 skb->data_len += len_on_bd; 678 skb->truesize += rxq->rx_buf_seg_size; 679 skb->len += len_on_bd; 680 681 return 0; 682 683 out: 684 tpa_info->state = QEDE_AGG_STATE_ERROR; 685 qede_recycle_rx_bd_ring(rxq, 1); 686 687 return -ENOMEM; 688 } 689 690 static bool qede_tunn_exist(u16 flag) 691 { 692 return !!(flag & (PARSING_AND_ERR_FLAGS_TUNNELEXIST_MASK << 693 PARSING_AND_ERR_FLAGS_TUNNELEXIST_SHIFT)); 694 } 695 696 static u8 qede_check_tunn_csum(u16 flag) 697 { 698 u16 csum_flag = 0; 699 u8 tcsum = 0; 700 701 if (flag & (PARSING_AND_ERR_FLAGS_TUNNELL4CHKSMWASCALCULATED_MASK << 702 PARSING_AND_ERR_FLAGS_TUNNELL4CHKSMWASCALCULATED_SHIFT)) 703 csum_flag |= PARSING_AND_ERR_FLAGS_TUNNELL4CHKSMERROR_MASK << 704 PARSING_AND_ERR_FLAGS_TUNNELL4CHKSMERROR_SHIFT; 705 706 if (flag & (PARSING_AND_ERR_FLAGS_L4CHKSMWASCALCULATED_MASK << 707 PARSING_AND_ERR_FLAGS_L4CHKSMWASCALCULATED_SHIFT)) { 708 csum_flag |= PARSING_AND_ERR_FLAGS_L4CHKSMERROR_MASK << 709 PARSING_AND_ERR_FLAGS_L4CHKSMERROR_SHIFT; 710 tcsum = QEDE_TUNN_CSUM_UNNECESSARY; 711 } 712 713 csum_flag |= PARSING_AND_ERR_FLAGS_TUNNELIPHDRERROR_MASK << 714 PARSING_AND_ERR_FLAGS_TUNNELIPHDRERROR_SHIFT | 715 PARSING_AND_ERR_FLAGS_IPHDRERROR_MASK << 716 PARSING_AND_ERR_FLAGS_IPHDRERROR_SHIFT; 717 718 if (csum_flag & flag) 719 return QEDE_CSUM_ERROR; 720 721 return QEDE_CSUM_UNNECESSARY | tcsum; 722 } 723 724 static inline struct sk_buff * 725 qede_build_skb(struct qede_rx_queue *rxq, 726 struct sw_rx_data *bd, u16 len, u16 pad) 727 { 728 struct sk_buff *skb; 729 void *buf; 730 731 buf = page_address(bd->data) + bd->page_offset; 732 skb = build_skb(buf, rxq->rx_buf_seg_size); 733 734 skb_reserve(skb, pad); 735 skb_put(skb, len); 736 737 return skb; 738 } 739 740 static struct sk_buff * 741 qede_tpa_rx_build_skb(struct qede_dev *edev, 742 struct qede_rx_queue *rxq, 743 struct sw_rx_data *bd, u16 len, u16 pad, 744 bool alloc_skb) 745 { 746 struct sk_buff *skb; 747 748 skb = qede_build_skb(rxq, bd, len, pad); 749 bd->page_offset += rxq->rx_buf_seg_size; 750 751 if (bd->page_offset == PAGE_SIZE) { 752 if (unlikely(qede_alloc_rx_buffer(rxq, true))) { 753 DP_NOTICE(edev, 754 "Failed to allocate RX buffer for tpa start\n"); 755 bd->page_offset -= rxq->rx_buf_seg_size; 756 page_ref_inc(bd->data); 757 dev_kfree_skb_any(skb); 758 return NULL; 759 } 760 } else { 761 page_ref_inc(bd->data); 762 qede_reuse_page(rxq, bd); 763 } 764 765 /* We've consumed the first BD and prepared an SKB */ 766 qede_rx_bd_ring_consume(rxq); 767 768 return skb; 769 } 770 771 static struct sk_buff * 772 qede_rx_build_skb(struct qede_dev *edev, 773 struct qede_rx_queue *rxq, 774 struct sw_rx_data *bd, u16 len, u16 pad) 775 { 776 struct sk_buff *skb = NULL; 777 778 /* For smaller frames still need to allocate skb, memcpy 779 * data and benefit in reusing the page segment instead of 780 * un-mapping it. 781 */ 782 if ((len + pad <= edev->rx_copybreak)) { 783 unsigned int offset = bd->page_offset + pad; 784 785 skb = netdev_alloc_skb(edev->ndev, QEDE_RX_HDR_SIZE); 786 if (unlikely(!skb)) 787 return NULL; 788 789 skb_reserve(skb, pad); 790 memcpy(skb_put(skb, len), 791 page_address(bd->data) + offset, len); 792 qede_reuse_page(rxq, bd); 793 goto out; 794 } 795 796 skb = qede_build_skb(rxq, bd, len, pad); 797 798 if (unlikely(qede_realloc_rx_buffer(rxq, bd))) { 799 /* Incr page ref count to reuse on allocation failure so 800 * that it doesn't get freed while freeing SKB [as its 801 * already mapped there]. 802 */ 803 page_ref_inc(bd->data); 804 dev_kfree_skb_any(skb); 805 return NULL; 806 } 807 out: 808 /* We've consumed the first BD and prepared an SKB */ 809 qede_rx_bd_ring_consume(rxq); 810 811 return skb; 812 } 813 814 static void qede_tpa_start(struct qede_dev *edev, 815 struct qede_rx_queue *rxq, 816 struct eth_fast_path_rx_tpa_start_cqe *cqe) 817 { 818 struct qede_agg_info *tpa_info = &rxq->tpa_info[cqe->tpa_agg_index]; 819 struct sw_rx_data *sw_rx_data_cons; 820 u16 pad; 821 822 sw_rx_data_cons = &rxq->sw_rx_ring[rxq->sw_rx_cons & NUM_RX_BDS_MAX]; 823 pad = cqe->placement_offset + rxq->rx_headroom; 824 825 tpa_info->skb = qede_tpa_rx_build_skb(edev, rxq, sw_rx_data_cons, 826 le16_to_cpu(cqe->len_on_first_bd), 827 pad, false); 828 tpa_info->buffer.page_offset = sw_rx_data_cons->page_offset; 829 tpa_info->buffer.mapping = sw_rx_data_cons->mapping; 830 831 if (unlikely(!tpa_info->skb)) { 832 DP_NOTICE(edev, "Failed to allocate SKB for gro\n"); 833 834 /* Consume from ring but do not produce since 835 * this might be used by FW still, it will be re-used 836 * at TPA end. 837 */ 838 tpa_info->tpa_start_fail = true; 839 qede_rx_bd_ring_consume(rxq); 840 tpa_info->state = QEDE_AGG_STATE_ERROR; 841 goto cons_buf; 842 } 843 844 tpa_info->frag_id = 0; 845 tpa_info->state = QEDE_AGG_STATE_START; 846 847 if ((le16_to_cpu(cqe->pars_flags.flags) >> 848 PARSING_AND_ERR_FLAGS_TAG8021QEXIST_SHIFT) & 849 PARSING_AND_ERR_FLAGS_TAG8021QEXIST_MASK) 850 tpa_info->vlan_tag = le16_to_cpu(cqe->vlan_tag); 851 else 852 tpa_info->vlan_tag = 0; 853 854 qede_get_rxhash(tpa_info->skb, cqe->bitfields, cqe->rss_hash); 855 856 /* This is needed in order to enable forwarding support */ 857 qede_set_gro_params(edev, tpa_info->skb, cqe); 858 859 cons_buf: /* We still need to handle bd_len_list to consume buffers */ 860 if (likely(cqe->ext_bd_len_list[0])) 861 qede_fill_frag_skb(edev, rxq, cqe->tpa_agg_index, 862 le16_to_cpu(cqe->ext_bd_len_list[0])); 863 864 if (unlikely(cqe->ext_bd_len_list[1])) { 865 DP_ERR(edev, 866 "Unlikely - got a TPA aggregation with more than one ext_bd_len_list entry in the TPA start\n"); 867 tpa_info->state = QEDE_AGG_STATE_ERROR; 868 } 869 } 870 871 #ifdef CONFIG_INET 872 static void qede_gro_ip_csum(struct sk_buff *skb) 873 { 874 const struct iphdr *iph = ip_hdr(skb); 875 struct tcphdr *th; 876 877 skb_set_transport_header(skb, sizeof(struct iphdr)); 878 th = tcp_hdr(skb); 879 880 th->check = ~tcp_v4_check(skb->len - skb_transport_offset(skb), 881 iph->saddr, iph->daddr, 0); 882 883 tcp_gro_complete(skb); 884 } 885 886 static void qede_gro_ipv6_csum(struct sk_buff *skb) 887 { 888 struct ipv6hdr *iph = ipv6_hdr(skb); 889 struct tcphdr *th; 890 891 skb_set_transport_header(skb, sizeof(struct ipv6hdr)); 892 th = tcp_hdr(skb); 893 894 th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), 895 &iph->saddr, &iph->daddr, 0); 896 tcp_gro_complete(skb); 897 } 898 #endif 899 900 static void qede_gro_receive(struct qede_dev *edev, 901 struct qede_fastpath *fp, 902 struct sk_buff *skb, 903 u16 vlan_tag) 904 { 905 /* FW can send a single MTU sized packet from gro flow 906 * due to aggregation timeout/last segment etc. which 907 * is not expected to be a gro packet. If a skb has zero 908 * frags then simply push it in the stack as non gso skb. 909 */ 910 if (unlikely(!skb->data_len)) { 911 skb_shinfo(skb)->gso_type = 0; 912 skb_shinfo(skb)->gso_size = 0; 913 goto send_skb; 914 } 915 916 #ifdef CONFIG_INET 917 if (skb_shinfo(skb)->gso_size) { 918 skb_reset_network_header(skb); 919 920 switch (skb->protocol) { 921 case htons(ETH_P_IP): 922 qede_gro_ip_csum(skb); 923 break; 924 case htons(ETH_P_IPV6): 925 qede_gro_ipv6_csum(skb); 926 break; 927 default: 928 DP_ERR(edev, 929 "Error: FW GRO supports only IPv4/IPv6, not 0x%04x\n", 930 ntohs(skb->protocol)); 931 } 932 } 933 #endif 934 935 send_skb: 936 skb_record_rx_queue(skb, fp->rxq->rxq_id); 937 qede_skb_receive(edev, fp, fp->rxq, skb, vlan_tag); 938 } 939 940 static inline void qede_tpa_cont(struct qede_dev *edev, 941 struct qede_rx_queue *rxq, 942 struct eth_fast_path_rx_tpa_cont_cqe *cqe) 943 { 944 int i; 945 946 for (i = 0; cqe->len_list[i]; i++) 947 qede_fill_frag_skb(edev, rxq, cqe->tpa_agg_index, 948 le16_to_cpu(cqe->len_list[i])); 949 950 if (unlikely(i > 1)) 951 DP_ERR(edev, 952 "Strange - TPA cont with more than a single len_list entry\n"); 953 } 954 955 static int qede_tpa_end(struct qede_dev *edev, 956 struct qede_fastpath *fp, 957 struct eth_fast_path_rx_tpa_end_cqe *cqe) 958 { 959 struct qede_rx_queue *rxq = fp->rxq; 960 struct qede_agg_info *tpa_info; 961 struct sk_buff *skb; 962 int i; 963 964 tpa_info = &rxq->tpa_info[cqe->tpa_agg_index]; 965 skb = tpa_info->skb; 966 967 if (tpa_info->buffer.page_offset == PAGE_SIZE) 968 dma_unmap_page(rxq->dev, tpa_info->buffer.mapping, 969 PAGE_SIZE, rxq->data_direction); 970 971 for (i = 0; cqe->len_list[i]; i++) 972 qede_fill_frag_skb(edev, rxq, cqe->tpa_agg_index, 973 le16_to_cpu(cqe->len_list[i])); 974 if (unlikely(i > 1)) 975 DP_ERR(edev, 976 "Strange - TPA emd with more than a single len_list entry\n"); 977 978 if (unlikely(tpa_info->state != QEDE_AGG_STATE_START)) 979 goto err; 980 981 /* Sanity */ 982 if (unlikely(cqe->num_of_bds != tpa_info->frag_id + 1)) 983 DP_ERR(edev, 984 "Strange - TPA had %02x BDs, but SKB has only %d frags\n", 985 cqe->num_of_bds, tpa_info->frag_id); 986 if (unlikely(skb->len != le16_to_cpu(cqe->total_packet_len))) 987 DP_ERR(edev, 988 "Strange - total packet len [cqe] is %4x but SKB has len %04x\n", 989 le16_to_cpu(cqe->total_packet_len), skb->len); 990 991 /* Finalize the SKB */ 992 skb->protocol = eth_type_trans(skb, edev->ndev); 993 skb->ip_summed = CHECKSUM_UNNECESSARY; 994 995 /* tcp_gro_complete() will copy NAPI_GRO_CB(skb)->count 996 * to skb_shinfo(skb)->gso_segs 997 */ 998 NAPI_GRO_CB(skb)->count = le16_to_cpu(cqe->num_of_coalesced_segs); 999 1000 qede_gro_receive(edev, fp, skb, tpa_info->vlan_tag); 1001 1002 tpa_info->state = QEDE_AGG_STATE_NONE; 1003 1004 return 1; 1005 err: 1006 tpa_info->state = QEDE_AGG_STATE_NONE; 1007 1008 if (tpa_info->tpa_start_fail) { 1009 qede_reuse_page(rxq, &tpa_info->buffer); 1010 tpa_info->tpa_start_fail = false; 1011 } 1012 1013 dev_kfree_skb_any(tpa_info->skb); 1014 tpa_info->skb = NULL; 1015 return 0; 1016 } 1017 1018 static u8 qede_check_notunn_csum(u16 flag) 1019 { 1020 u16 csum_flag = 0; 1021 u8 csum = 0; 1022 1023 if (flag & (PARSING_AND_ERR_FLAGS_L4CHKSMWASCALCULATED_MASK << 1024 PARSING_AND_ERR_FLAGS_L4CHKSMWASCALCULATED_SHIFT)) { 1025 csum_flag |= PARSING_AND_ERR_FLAGS_L4CHKSMERROR_MASK << 1026 PARSING_AND_ERR_FLAGS_L4CHKSMERROR_SHIFT; 1027 csum = QEDE_CSUM_UNNECESSARY; 1028 } 1029 1030 csum_flag |= PARSING_AND_ERR_FLAGS_IPHDRERROR_MASK << 1031 PARSING_AND_ERR_FLAGS_IPHDRERROR_SHIFT; 1032 1033 if (csum_flag & flag) 1034 return QEDE_CSUM_ERROR; 1035 1036 return csum; 1037 } 1038 1039 static u8 qede_check_csum(u16 flag) 1040 { 1041 if (!qede_tunn_exist(flag)) 1042 return qede_check_notunn_csum(flag); 1043 else 1044 return qede_check_tunn_csum(flag); 1045 } 1046 1047 static bool qede_pkt_is_ip_fragmented(struct eth_fast_path_rx_reg_cqe *cqe, 1048 u16 flag) 1049 { 1050 u8 tun_pars_flg = cqe->tunnel_pars_flags.flags; 1051 1052 if ((tun_pars_flg & (ETH_TUNNEL_PARSING_FLAGS_IPV4_FRAGMENT_MASK << 1053 ETH_TUNNEL_PARSING_FLAGS_IPV4_FRAGMENT_SHIFT)) || 1054 (flag & (PARSING_AND_ERR_FLAGS_IPV4FRAG_MASK << 1055 PARSING_AND_ERR_FLAGS_IPV4FRAG_SHIFT))) 1056 return true; 1057 1058 return false; 1059 } 1060 1061 /* Return true iff packet is to be passed to stack */ 1062 static bool qede_rx_xdp(struct qede_dev *edev, 1063 struct qede_fastpath *fp, 1064 struct qede_rx_queue *rxq, 1065 struct bpf_prog *prog, 1066 struct sw_rx_data *bd, 1067 struct eth_fast_path_rx_reg_cqe *cqe, 1068 u16 *data_offset, u16 *len) 1069 { 1070 struct xdp_buff xdp; 1071 enum xdp_action act; 1072 1073 xdp.data_hard_start = page_address(bd->data); 1074 xdp.data = xdp.data_hard_start + *data_offset; 1075 xdp_set_data_meta_invalid(&xdp); 1076 xdp.data_end = xdp.data + *len; 1077 xdp.rxq = &rxq->xdp_rxq; 1078 1079 /* Queues always have a full reset currently, so for the time 1080 * being until there's atomic program replace just mark read 1081 * side for map helpers. 1082 */ 1083 rcu_read_lock(); 1084 act = bpf_prog_run_xdp(prog, &xdp); 1085 rcu_read_unlock(); 1086 1087 /* Recalculate, as XDP might have changed the headers */ 1088 *data_offset = xdp.data - xdp.data_hard_start; 1089 *len = xdp.data_end - xdp.data; 1090 1091 if (act == XDP_PASS) 1092 return true; 1093 1094 /* Count number of packets not to be passed to stack */ 1095 rxq->xdp_no_pass++; 1096 1097 switch (act) { 1098 case XDP_TX: 1099 /* We need the replacement buffer before transmit. */ 1100 if (qede_alloc_rx_buffer(rxq, true)) { 1101 qede_recycle_rx_bd_ring(rxq, 1); 1102 trace_xdp_exception(edev->ndev, prog, act); 1103 return false; 1104 } 1105 1106 /* Now if there's a transmission problem, we'd still have to 1107 * throw current buffer, as replacement was already allocated. 1108 */ 1109 if (qede_xdp_xmit(edev, fp, bd, *data_offset, *len)) { 1110 dma_unmap_page(rxq->dev, bd->mapping, 1111 PAGE_SIZE, DMA_BIDIRECTIONAL); 1112 __free_page(bd->data); 1113 trace_xdp_exception(edev->ndev, prog, act); 1114 } 1115 1116 /* Regardless, we've consumed an Rx BD */ 1117 qede_rx_bd_ring_consume(rxq); 1118 return false; 1119 1120 default: 1121 bpf_warn_invalid_xdp_action(act); 1122 /* Fall through */ 1123 case XDP_ABORTED: 1124 trace_xdp_exception(edev->ndev, prog, act); 1125 /* Fall through */ 1126 case XDP_DROP: 1127 qede_recycle_rx_bd_ring(rxq, cqe->bd_num); 1128 } 1129 1130 return false; 1131 } 1132 1133 static int qede_rx_build_jumbo(struct qede_dev *edev, 1134 struct qede_rx_queue *rxq, 1135 struct sk_buff *skb, 1136 struct eth_fast_path_rx_reg_cqe *cqe, 1137 u16 first_bd_len) 1138 { 1139 u16 pkt_len = le16_to_cpu(cqe->pkt_len); 1140 struct sw_rx_data *bd; 1141 u16 bd_cons_idx; 1142 u8 num_frags; 1143 1144 pkt_len -= first_bd_len; 1145 1146 /* We've already used one BD for the SKB. Now take care of the rest */ 1147 for (num_frags = cqe->bd_num - 1; num_frags > 0; num_frags--) { 1148 u16 cur_size = pkt_len > rxq->rx_buf_size ? rxq->rx_buf_size : 1149 pkt_len; 1150 1151 if (unlikely(!cur_size)) { 1152 DP_ERR(edev, 1153 "Still got %d BDs for mapping jumbo, but length became 0\n", 1154 num_frags); 1155 goto out; 1156 } 1157 1158 /* We need a replacement buffer for each BD */ 1159 if (unlikely(qede_alloc_rx_buffer(rxq, true))) 1160 goto out; 1161 1162 /* Now that we've allocated the replacement buffer, 1163 * we can safely consume the next BD and map it to the SKB. 1164 */ 1165 bd_cons_idx = rxq->sw_rx_cons & NUM_RX_BDS_MAX; 1166 bd = &rxq->sw_rx_ring[bd_cons_idx]; 1167 qede_rx_bd_ring_consume(rxq); 1168 1169 dma_unmap_page(rxq->dev, bd->mapping, 1170 PAGE_SIZE, DMA_FROM_DEVICE); 1171 1172 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags++, 1173 bd->data, rxq->rx_headroom, cur_size); 1174 1175 skb->truesize += PAGE_SIZE; 1176 skb->data_len += cur_size; 1177 skb->len += cur_size; 1178 pkt_len -= cur_size; 1179 } 1180 1181 if (unlikely(pkt_len)) 1182 DP_ERR(edev, 1183 "Mapped all BDs of jumbo, but still have %d bytes\n", 1184 pkt_len); 1185 1186 out: 1187 return num_frags; 1188 } 1189 1190 static int qede_rx_process_tpa_cqe(struct qede_dev *edev, 1191 struct qede_fastpath *fp, 1192 struct qede_rx_queue *rxq, 1193 union eth_rx_cqe *cqe, 1194 enum eth_rx_cqe_type type) 1195 { 1196 switch (type) { 1197 case ETH_RX_CQE_TYPE_TPA_START: 1198 qede_tpa_start(edev, rxq, &cqe->fast_path_tpa_start); 1199 return 0; 1200 case ETH_RX_CQE_TYPE_TPA_CONT: 1201 qede_tpa_cont(edev, rxq, &cqe->fast_path_tpa_cont); 1202 return 0; 1203 case ETH_RX_CQE_TYPE_TPA_END: 1204 return qede_tpa_end(edev, fp, &cqe->fast_path_tpa_end); 1205 default: 1206 return 0; 1207 } 1208 } 1209 1210 static int qede_rx_process_cqe(struct qede_dev *edev, 1211 struct qede_fastpath *fp, 1212 struct qede_rx_queue *rxq) 1213 { 1214 struct bpf_prog *xdp_prog = READ_ONCE(rxq->xdp_prog); 1215 struct eth_fast_path_rx_reg_cqe *fp_cqe; 1216 u16 len, pad, bd_cons_idx, parse_flag; 1217 enum eth_rx_cqe_type cqe_type; 1218 union eth_rx_cqe *cqe; 1219 struct sw_rx_data *bd; 1220 struct sk_buff *skb; 1221 __le16 flags; 1222 u8 csum_flag; 1223 1224 /* Get the CQE from the completion ring */ 1225 cqe = (union eth_rx_cqe *)qed_chain_consume(&rxq->rx_comp_ring); 1226 cqe_type = cqe->fast_path_regular.type; 1227 1228 /* Process an unlikely slowpath event */ 1229 if (unlikely(cqe_type == ETH_RX_CQE_TYPE_SLOW_PATH)) { 1230 struct eth_slow_path_rx_cqe *sp_cqe; 1231 1232 sp_cqe = (struct eth_slow_path_rx_cqe *)cqe; 1233 edev->ops->eth_cqe_completion(edev->cdev, fp->id, sp_cqe); 1234 return 0; 1235 } 1236 1237 /* Handle TPA cqes */ 1238 if (cqe_type != ETH_RX_CQE_TYPE_REGULAR) 1239 return qede_rx_process_tpa_cqe(edev, fp, rxq, cqe, cqe_type); 1240 1241 /* Get the data from the SW ring; Consume it only after it's evident 1242 * we wouldn't recycle it. 1243 */ 1244 bd_cons_idx = rxq->sw_rx_cons & NUM_RX_BDS_MAX; 1245 bd = &rxq->sw_rx_ring[bd_cons_idx]; 1246 1247 fp_cqe = &cqe->fast_path_regular; 1248 len = le16_to_cpu(fp_cqe->len_on_first_bd); 1249 pad = fp_cqe->placement_offset + rxq->rx_headroom; 1250 1251 /* Run eBPF program if one is attached */ 1252 if (xdp_prog) 1253 if (!qede_rx_xdp(edev, fp, rxq, xdp_prog, bd, fp_cqe, 1254 &pad, &len)) 1255 return 0; 1256 1257 /* If this is an error packet then drop it */ 1258 flags = cqe->fast_path_regular.pars_flags.flags; 1259 parse_flag = le16_to_cpu(flags); 1260 1261 csum_flag = qede_check_csum(parse_flag); 1262 if (unlikely(csum_flag == QEDE_CSUM_ERROR)) { 1263 if (qede_pkt_is_ip_fragmented(fp_cqe, parse_flag)) 1264 rxq->rx_ip_frags++; 1265 else 1266 rxq->rx_hw_errors++; 1267 } 1268 1269 /* Basic validation passed; Need to prepare an SKB. This would also 1270 * guarantee to finally consume the first BD upon success. 1271 */ 1272 skb = qede_rx_build_skb(edev, rxq, bd, len, pad); 1273 if (!skb) { 1274 rxq->rx_alloc_errors++; 1275 qede_recycle_rx_bd_ring(rxq, fp_cqe->bd_num); 1276 return 0; 1277 } 1278 1279 /* In case of Jumbo packet, several PAGE_SIZEd buffers will be pointed 1280 * by a single cqe. 1281 */ 1282 if (fp_cqe->bd_num > 1) { 1283 u16 unmapped_frags = qede_rx_build_jumbo(edev, rxq, skb, 1284 fp_cqe, len); 1285 1286 if (unlikely(unmapped_frags > 0)) { 1287 qede_recycle_rx_bd_ring(rxq, unmapped_frags); 1288 dev_kfree_skb_any(skb); 1289 return 0; 1290 } 1291 } 1292 1293 /* The SKB contains all the data. Now prepare meta-magic */ 1294 skb->protocol = eth_type_trans(skb, edev->ndev); 1295 qede_get_rxhash(skb, fp_cqe->bitfields, fp_cqe->rss_hash); 1296 qede_set_skb_csum(skb, csum_flag); 1297 skb_record_rx_queue(skb, rxq->rxq_id); 1298 qede_ptp_record_rx_ts(edev, cqe, skb); 1299 1300 /* SKB is prepared - pass it to stack */ 1301 qede_skb_receive(edev, fp, rxq, skb, le16_to_cpu(fp_cqe->vlan_tag)); 1302 1303 return 1; 1304 } 1305 1306 static int qede_rx_int(struct qede_fastpath *fp, int budget) 1307 { 1308 struct qede_rx_queue *rxq = fp->rxq; 1309 struct qede_dev *edev = fp->edev; 1310 int work_done = 0, rcv_pkts = 0; 1311 u16 hw_comp_cons, sw_comp_cons; 1312 1313 hw_comp_cons = le16_to_cpu(*rxq->hw_cons_ptr); 1314 sw_comp_cons = qed_chain_get_cons_idx(&rxq->rx_comp_ring); 1315 1316 /* Memory barrier to prevent the CPU from doing speculative reads of CQE 1317 * / BD in the while-loop before reading hw_comp_cons. If the CQE is 1318 * read before it is written by FW, then FW writes CQE and SB, and then 1319 * the CPU reads the hw_comp_cons, it will use an old CQE. 1320 */ 1321 rmb(); 1322 1323 /* Loop to complete all indicated BDs */ 1324 while ((sw_comp_cons != hw_comp_cons) && (work_done < budget)) { 1325 rcv_pkts += qede_rx_process_cqe(edev, fp, rxq); 1326 qed_chain_recycle_consumed(&rxq->rx_comp_ring); 1327 sw_comp_cons = qed_chain_get_cons_idx(&rxq->rx_comp_ring); 1328 work_done++; 1329 } 1330 1331 rxq->rcv_pkts += rcv_pkts; 1332 1333 /* Allocate replacement buffers */ 1334 while (rxq->num_rx_buffers - rxq->filled_buffers) 1335 if (qede_alloc_rx_buffer(rxq, false)) 1336 break; 1337 1338 /* Update producers */ 1339 qede_update_rx_prod(edev, rxq); 1340 1341 return work_done; 1342 } 1343 1344 static bool qede_poll_is_more_work(struct qede_fastpath *fp) 1345 { 1346 qed_sb_update_sb_idx(fp->sb_info); 1347 1348 /* *_has_*_work() reads the status block, thus we need to ensure that 1349 * status block indices have been actually read (qed_sb_update_sb_idx) 1350 * prior to this check (*_has_*_work) so that we won't write the 1351 * "newer" value of the status block to HW (if there was a DMA right 1352 * after qede_has_rx_work and if there is no rmb, the memory reading 1353 * (qed_sb_update_sb_idx) may be postponed to right before *_ack_sb). 1354 * In this case there will never be another interrupt until there is 1355 * another update of the status block, while there is still unhandled 1356 * work. 1357 */ 1358 rmb(); 1359 1360 if (likely(fp->type & QEDE_FASTPATH_RX)) 1361 if (qede_has_rx_work(fp->rxq)) 1362 return true; 1363 1364 if (fp->type & QEDE_FASTPATH_XDP) 1365 if (qede_txq_has_work(fp->xdp_tx)) 1366 return true; 1367 1368 if (likely(fp->type & QEDE_FASTPATH_TX)) { 1369 int cos; 1370 1371 for_each_cos_in_txq(fp->edev, cos) { 1372 if (qede_txq_has_work(&fp->txq[cos])) 1373 return true; 1374 } 1375 } 1376 1377 return false; 1378 } 1379 1380 /********************* 1381 * NDO & API related * 1382 *********************/ 1383 int qede_poll(struct napi_struct *napi, int budget) 1384 { 1385 struct qede_fastpath *fp = container_of(napi, struct qede_fastpath, 1386 napi); 1387 struct qede_dev *edev = fp->edev; 1388 int rx_work_done = 0; 1389 1390 if (likely(fp->type & QEDE_FASTPATH_TX)) { 1391 int cos; 1392 1393 for_each_cos_in_txq(fp->edev, cos) { 1394 if (qede_txq_has_work(&fp->txq[cos])) 1395 qede_tx_int(edev, &fp->txq[cos]); 1396 } 1397 } 1398 1399 if ((fp->type & QEDE_FASTPATH_XDP) && qede_txq_has_work(fp->xdp_tx)) 1400 qede_xdp_tx_int(edev, fp->xdp_tx); 1401 1402 rx_work_done = (likely(fp->type & QEDE_FASTPATH_RX) && 1403 qede_has_rx_work(fp->rxq)) ? 1404 qede_rx_int(fp, budget) : 0; 1405 if (rx_work_done < budget) { 1406 if (!qede_poll_is_more_work(fp)) { 1407 napi_complete_done(napi, rx_work_done); 1408 1409 /* Update and reenable interrupts */ 1410 qed_sb_ack(fp->sb_info, IGU_INT_ENABLE, 1); 1411 } else { 1412 rx_work_done = budget; 1413 } 1414 } 1415 1416 if (fp->xdp_xmit) { 1417 u16 xdp_prod = qed_chain_get_prod_idx(&fp->xdp_tx->tx_pbl); 1418 1419 fp->xdp_xmit = 0; 1420 fp->xdp_tx->tx_db.data.bd_prod = cpu_to_le16(xdp_prod); 1421 qede_update_tx_producer(fp->xdp_tx); 1422 } 1423 1424 return rx_work_done; 1425 } 1426 1427 irqreturn_t qede_msix_fp_int(int irq, void *fp_cookie) 1428 { 1429 struct qede_fastpath *fp = fp_cookie; 1430 1431 qed_sb_ack(fp->sb_info, IGU_INT_DISABLE, 0 /*do not update*/); 1432 1433 napi_schedule_irqoff(&fp->napi); 1434 return IRQ_HANDLED; 1435 } 1436 1437 /* Main transmit function */ 1438 netdev_tx_t qede_start_xmit(struct sk_buff *skb, struct net_device *ndev) 1439 { 1440 struct qede_dev *edev = netdev_priv(ndev); 1441 struct netdev_queue *netdev_txq; 1442 struct qede_tx_queue *txq; 1443 struct eth_tx_1st_bd *first_bd; 1444 struct eth_tx_2nd_bd *second_bd = NULL; 1445 struct eth_tx_3rd_bd *third_bd = NULL; 1446 struct eth_tx_bd *tx_data_bd = NULL; 1447 u16 txq_index, val = 0; 1448 u8 nbd = 0; 1449 dma_addr_t mapping; 1450 int rc, frag_idx = 0, ipv6_ext = 0; 1451 u8 xmit_type; 1452 u16 idx; 1453 u16 hlen; 1454 bool data_split = false; 1455 1456 /* Get tx-queue context and netdev index */ 1457 txq_index = skb_get_queue_mapping(skb); 1458 WARN_ON(txq_index >= QEDE_TSS_COUNT(edev) * edev->dev_info.num_tc); 1459 txq = QEDE_NDEV_TXQ_ID_TO_TXQ(edev, txq_index); 1460 netdev_txq = netdev_get_tx_queue(ndev, txq_index); 1461 1462 WARN_ON(qed_chain_get_elem_left(&txq->tx_pbl) < (MAX_SKB_FRAGS + 1)); 1463 1464 xmit_type = qede_xmit_type(skb, &ipv6_ext); 1465 1466 #if ((MAX_SKB_FRAGS + 2) > ETH_TX_MAX_BDS_PER_NON_LSO_PACKET) 1467 if (qede_pkt_req_lin(skb, xmit_type)) { 1468 if (skb_linearize(skb)) { 1469 DP_NOTICE(edev, 1470 "SKB linearization failed - silently dropping this SKB\n"); 1471 dev_kfree_skb_any(skb); 1472 return NETDEV_TX_OK; 1473 } 1474 } 1475 #endif 1476 1477 /* Fill the entry in the SW ring and the BDs in the FW ring */ 1478 idx = txq->sw_tx_prod; 1479 txq->sw_tx_ring.skbs[idx].skb = skb; 1480 first_bd = (struct eth_tx_1st_bd *) 1481 qed_chain_produce(&txq->tx_pbl); 1482 memset(first_bd, 0, sizeof(*first_bd)); 1483 first_bd->data.bd_flags.bitfields = 1484 1 << ETH_TX_1ST_BD_FLAGS_START_BD_SHIFT; 1485 1486 if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) 1487 qede_ptp_tx_ts(edev, skb); 1488 1489 /* Map skb linear data for DMA and set in the first BD */ 1490 mapping = dma_map_single(txq->dev, skb->data, 1491 skb_headlen(skb), DMA_TO_DEVICE); 1492 if (unlikely(dma_mapping_error(txq->dev, mapping))) { 1493 DP_NOTICE(edev, "SKB mapping failed\n"); 1494 qede_free_failed_tx_pkt(txq, first_bd, 0, false); 1495 qede_update_tx_producer(txq); 1496 return NETDEV_TX_OK; 1497 } 1498 nbd++; 1499 BD_SET_UNMAP_ADDR_LEN(first_bd, mapping, skb_headlen(skb)); 1500 1501 /* In case there is IPv6 with extension headers or LSO we need 2nd and 1502 * 3rd BDs. 1503 */ 1504 if (unlikely((xmit_type & XMIT_LSO) | ipv6_ext)) { 1505 second_bd = (struct eth_tx_2nd_bd *) 1506 qed_chain_produce(&txq->tx_pbl); 1507 memset(second_bd, 0, sizeof(*second_bd)); 1508 1509 nbd++; 1510 third_bd = (struct eth_tx_3rd_bd *) 1511 qed_chain_produce(&txq->tx_pbl); 1512 memset(third_bd, 0, sizeof(*third_bd)); 1513 1514 nbd++; 1515 /* We need to fill in additional data in second_bd... */ 1516 tx_data_bd = (struct eth_tx_bd *)second_bd; 1517 } 1518 1519 if (skb_vlan_tag_present(skb)) { 1520 first_bd->data.vlan = cpu_to_le16(skb_vlan_tag_get(skb)); 1521 first_bd->data.bd_flags.bitfields |= 1522 1 << ETH_TX_1ST_BD_FLAGS_VLAN_INSERTION_SHIFT; 1523 } 1524 1525 /* Fill the parsing flags & params according to the requested offload */ 1526 if (xmit_type & XMIT_L4_CSUM) { 1527 /* We don't re-calculate IP checksum as it is already done by 1528 * the upper stack 1529 */ 1530 first_bd->data.bd_flags.bitfields |= 1531 1 << ETH_TX_1ST_BD_FLAGS_L4_CSUM_SHIFT; 1532 1533 if (xmit_type & XMIT_ENC) { 1534 first_bd->data.bd_flags.bitfields |= 1535 1 << ETH_TX_1ST_BD_FLAGS_IP_CSUM_SHIFT; 1536 1537 val |= (1 << ETH_TX_DATA_1ST_BD_TUNN_FLAG_SHIFT); 1538 } 1539 1540 /* Legacy FW had flipped behavior in regard to this bit - 1541 * I.e., needed to set to prevent FW from touching encapsulated 1542 * packets when it didn't need to. 1543 */ 1544 if (unlikely(txq->is_legacy)) 1545 val ^= (1 << ETH_TX_DATA_1ST_BD_TUNN_FLAG_SHIFT); 1546 1547 /* If the packet is IPv6 with extension header, indicate that 1548 * to FW and pass few params, since the device cracker doesn't 1549 * support parsing IPv6 with extension header/s. 1550 */ 1551 if (unlikely(ipv6_ext)) 1552 qede_set_params_for_ipv6_ext(skb, second_bd, third_bd); 1553 } 1554 1555 if (xmit_type & XMIT_LSO) { 1556 first_bd->data.bd_flags.bitfields |= 1557 (1 << ETH_TX_1ST_BD_FLAGS_LSO_SHIFT); 1558 third_bd->data.lso_mss = 1559 cpu_to_le16(skb_shinfo(skb)->gso_size); 1560 1561 if (unlikely(xmit_type & XMIT_ENC)) { 1562 first_bd->data.bd_flags.bitfields |= 1563 1 << ETH_TX_1ST_BD_FLAGS_TUNN_IP_CSUM_SHIFT; 1564 1565 if (xmit_type & XMIT_ENC_GSO_L4_CSUM) { 1566 u8 tmp = ETH_TX_1ST_BD_FLAGS_TUNN_L4_CSUM_SHIFT; 1567 1568 first_bd->data.bd_flags.bitfields |= 1 << tmp; 1569 } 1570 hlen = qede_get_skb_hlen(skb, true); 1571 } else { 1572 first_bd->data.bd_flags.bitfields |= 1573 1 << ETH_TX_1ST_BD_FLAGS_IP_CSUM_SHIFT; 1574 hlen = qede_get_skb_hlen(skb, false); 1575 } 1576 1577 /* @@@TBD - if will not be removed need to check */ 1578 third_bd->data.bitfields |= 1579 cpu_to_le16(1 << ETH_TX_DATA_3RD_BD_HDR_NBD_SHIFT); 1580 1581 /* Make life easier for FW guys who can't deal with header and 1582 * data on same BD. If we need to split, use the second bd... 1583 */ 1584 if (unlikely(skb_headlen(skb) > hlen)) { 1585 DP_VERBOSE(edev, NETIF_MSG_TX_QUEUED, 1586 "TSO split header size is %d (%x:%x)\n", 1587 first_bd->nbytes, first_bd->addr.hi, 1588 first_bd->addr.lo); 1589 1590 mapping = HILO_U64(le32_to_cpu(first_bd->addr.hi), 1591 le32_to_cpu(first_bd->addr.lo)) + 1592 hlen; 1593 1594 BD_SET_UNMAP_ADDR_LEN(tx_data_bd, mapping, 1595 le16_to_cpu(first_bd->nbytes) - 1596 hlen); 1597 1598 /* this marks the BD as one that has no 1599 * individual mapping 1600 */ 1601 txq->sw_tx_ring.skbs[idx].flags |= QEDE_TSO_SPLIT_BD; 1602 1603 first_bd->nbytes = cpu_to_le16(hlen); 1604 1605 tx_data_bd = (struct eth_tx_bd *)third_bd; 1606 data_split = true; 1607 } 1608 } else { 1609 val |= ((skb->len & ETH_TX_DATA_1ST_BD_PKT_LEN_MASK) << 1610 ETH_TX_DATA_1ST_BD_PKT_LEN_SHIFT); 1611 } 1612 1613 first_bd->data.bitfields = cpu_to_le16(val); 1614 1615 /* Handle fragmented skb */ 1616 /* special handle for frags inside 2nd and 3rd bds.. */ 1617 while (tx_data_bd && frag_idx < skb_shinfo(skb)->nr_frags) { 1618 rc = map_frag_to_bd(txq, 1619 &skb_shinfo(skb)->frags[frag_idx], 1620 tx_data_bd); 1621 if (rc) { 1622 qede_free_failed_tx_pkt(txq, first_bd, nbd, data_split); 1623 qede_update_tx_producer(txq); 1624 return NETDEV_TX_OK; 1625 } 1626 1627 if (tx_data_bd == (struct eth_tx_bd *)second_bd) 1628 tx_data_bd = (struct eth_tx_bd *)third_bd; 1629 else 1630 tx_data_bd = NULL; 1631 1632 frag_idx++; 1633 } 1634 1635 /* map last frags into 4th, 5th .... */ 1636 for (; frag_idx < skb_shinfo(skb)->nr_frags; frag_idx++, nbd++) { 1637 tx_data_bd = (struct eth_tx_bd *) 1638 qed_chain_produce(&txq->tx_pbl); 1639 1640 memset(tx_data_bd, 0, sizeof(*tx_data_bd)); 1641 1642 rc = map_frag_to_bd(txq, 1643 &skb_shinfo(skb)->frags[frag_idx], 1644 tx_data_bd); 1645 if (rc) { 1646 qede_free_failed_tx_pkt(txq, first_bd, nbd, data_split); 1647 qede_update_tx_producer(txq); 1648 return NETDEV_TX_OK; 1649 } 1650 } 1651 1652 /* update the first BD with the actual num BDs */ 1653 first_bd->data.nbds = nbd; 1654 1655 netdev_tx_sent_queue(netdev_txq, skb->len); 1656 1657 skb_tx_timestamp(skb); 1658 1659 /* Advance packet producer only before sending the packet since mapping 1660 * of pages may fail. 1661 */ 1662 txq->sw_tx_prod = (txq->sw_tx_prod + 1) % txq->num_tx_buffers; 1663 1664 /* 'next page' entries are counted in the producer value */ 1665 txq->tx_db.data.bd_prod = 1666 cpu_to_le16(qed_chain_get_prod_idx(&txq->tx_pbl)); 1667 1668 if (!skb->xmit_more || netif_xmit_stopped(netdev_txq)) 1669 qede_update_tx_producer(txq); 1670 1671 if (unlikely(qed_chain_get_elem_left(&txq->tx_pbl) 1672 < (MAX_SKB_FRAGS + 1))) { 1673 if (skb->xmit_more) 1674 qede_update_tx_producer(txq); 1675 1676 netif_tx_stop_queue(netdev_txq); 1677 txq->stopped_cnt++; 1678 DP_VERBOSE(edev, NETIF_MSG_TX_QUEUED, 1679 "Stop queue was called\n"); 1680 /* paired memory barrier is in qede_tx_int(), we have to keep 1681 * ordering of set_bit() in netif_tx_stop_queue() and read of 1682 * fp->bd_tx_cons 1683 */ 1684 smp_mb(); 1685 1686 if ((qed_chain_get_elem_left(&txq->tx_pbl) >= 1687 (MAX_SKB_FRAGS + 1)) && 1688 (edev->state == QEDE_STATE_OPEN)) { 1689 netif_tx_wake_queue(netdev_txq); 1690 DP_VERBOSE(edev, NETIF_MSG_TX_QUEUED, 1691 "Wake queue was called\n"); 1692 } 1693 } 1694 1695 return NETDEV_TX_OK; 1696 } 1697 1698 /* 8B udp header + 8B base tunnel header + 32B option length */ 1699 #define QEDE_MAX_TUN_HDR_LEN 48 1700 1701 netdev_features_t qede_features_check(struct sk_buff *skb, 1702 struct net_device *dev, 1703 netdev_features_t features) 1704 { 1705 if (skb->encapsulation) { 1706 u8 l4_proto = 0; 1707 1708 switch (vlan_get_protocol(skb)) { 1709 case htons(ETH_P_IP): 1710 l4_proto = ip_hdr(skb)->protocol; 1711 break; 1712 case htons(ETH_P_IPV6): 1713 l4_proto = ipv6_hdr(skb)->nexthdr; 1714 break; 1715 default: 1716 return features; 1717 } 1718 1719 /* Disable offloads for geneve tunnels, as HW can't parse 1720 * the geneve header which has option length greater than 32b 1721 * and disable offloads for the ports which are not offloaded. 1722 */ 1723 if (l4_proto == IPPROTO_UDP) { 1724 struct qede_dev *edev = netdev_priv(dev); 1725 u16 hdrlen, vxln_port, gnv_port; 1726 1727 hdrlen = QEDE_MAX_TUN_HDR_LEN; 1728 vxln_port = edev->vxlan_dst_port; 1729 gnv_port = edev->geneve_dst_port; 1730 1731 if ((skb_inner_mac_header(skb) - 1732 skb_transport_header(skb)) > hdrlen || 1733 (ntohs(udp_hdr(skb)->dest) != vxln_port && 1734 ntohs(udp_hdr(skb)->dest) != gnv_port)) 1735 return features & ~(NETIF_F_CSUM_MASK | 1736 NETIF_F_GSO_MASK); 1737 } 1738 } 1739 1740 return features; 1741 } 1742