1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) 2 3#include <linux/bpf_trace.h> 4#include <linux/dma-mapping.h> 5#include <linux/etherdevice.h> 6#include <linux/filter.h> 7#include <linux/irq.h> 8#include <linux/pci.h> 9#include <linux/skbuff.h> 10#include "funeth_txrx.h" 11#include "funeth.h" 12#include "fun_queue.h" 13 14#define CREATE_TRACE_POINTS 15#include "funeth_trace.h" 16 17/* Given the device's max supported MTU and pages of at least 4KB a packet can 18 * be scattered into at most 4 buffers. 19 */ 20#define RX_MAX_FRAGS 4 21 22/* Per packet headroom in non-XDP mode. Present only for 1-frag packets. */ 23#define FUN_RX_HEADROOM (NET_SKB_PAD + NET_IP_ALIGN) 24 25/* We try to reuse pages for our buffers. To avoid frequent page ref writes we 26 * take EXTRA_PAGE_REFS references at once and then hand them out one per packet 27 * occupying the buffer. 28 */ 29#define EXTRA_PAGE_REFS 1000000 30#define MIN_PAGE_REFS 1000 31 32enum { 33 FUN_XDP_FLUSH_REDIR = 1, 34 FUN_XDP_FLUSH_TX = 2, 35}; 36 37/* See if a page is running low on refs we are holding and if so take more. */ 38static void refresh_refs(struct funeth_rxbuf *buf) 39{ 40 if (unlikely(buf->pg_refs < MIN_PAGE_REFS)) { 41 buf->pg_refs += EXTRA_PAGE_REFS; 42 page_ref_add(buf->page, EXTRA_PAGE_REFS); 43 } 44} 45 46/* Offer a buffer to the Rx buffer cache. The cache will hold the buffer if its 47 * page is worth retaining and there's room for it. Otherwise the page is 48 * unmapped and our references released. 49 */ 50static void cache_offer(struct funeth_rxq *q, const struct funeth_rxbuf *buf) 51{ 52 struct funeth_rx_cache *c = &q->cache; 53 54 if (c->prod_cnt - c->cons_cnt <= c->mask && buf->node == numa_mem_id()) { 55 c->bufs[c->prod_cnt & c->mask] = *buf; 56 c->prod_cnt++; 57 } else { 58 dma_unmap_page_attrs(q->dma_dev, buf->dma_addr, PAGE_SIZE, 59 DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC); 60 __page_frag_cache_drain(buf->page, buf->pg_refs); 61 } 62} 63 64/* Get a page from the Rx buffer cache. We only consider the next available 65 * page and return it if we own all its references. 66 */ 67static bool cache_get(struct funeth_rxq *q, struct funeth_rxbuf *rb) 68{ 69 struct funeth_rx_cache *c = &q->cache; 70 struct funeth_rxbuf *buf; 71 72 if (c->prod_cnt == c->cons_cnt) 73 return false; /* empty cache */ 74 75 buf = &c->bufs[c->cons_cnt & c->mask]; 76 if (page_ref_count(buf->page) == buf->pg_refs) { 77 dma_sync_single_for_device(q->dma_dev, buf->dma_addr, 78 PAGE_SIZE, DMA_FROM_DEVICE); 79 *rb = *buf; 80 buf->page = NULL; 81 refresh_refs(rb); 82 c->cons_cnt++; 83 return true; 84 } 85 86 /* Page can't be reused. If the cache is full drop this page. */ 87 if (c->prod_cnt - c->cons_cnt > c->mask) { 88 dma_unmap_page_attrs(q->dma_dev, buf->dma_addr, PAGE_SIZE, 89 DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC); 90 __page_frag_cache_drain(buf->page, buf->pg_refs); 91 buf->page = NULL; 92 c->cons_cnt++; 93 } 94 return false; 95} 96 97/* Allocate and DMA-map a page for receive. */ 98static int funeth_alloc_page(struct funeth_rxq *q, struct funeth_rxbuf *rb, 99 int node, gfp_t gfp) 100{ 101 struct page *p; 102 103 if (cache_get(q, rb)) 104 return 0; 105 106 p = __alloc_pages_node(node, gfp | __GFP_NOWARN, 0); 107 if (unlikely(!p)) 108 return -ENOMEM; 109 110 rb->dma_addr = dma_map_page(q->dma_dev, p, 0, PAGE_SIZE, 111 DMA_FROM_DEVICE); 112 if (unlikely(dma_mapping_error(q->dma_dev, rb->dma_addr))) { 113 FUN_QSTAT_INC(q, rx_map_err); 114 __free_page(p); 115 return -ENOMEM; 116 } 117 118 FUN_QSTAT_INC(q, rx_page_alloc); 119 120 rb->page = p; 121 rb->pg_refs = 1; 122 refresh_refs(rb); 123 rb->node = page_is_pfmemalloc(p) ? -1 : page_to_nid(p); 124 return 0; 125} 126 127static void funeth_free_page(struct funeth_rxq *q, struct funeth_rxbuf *rb) 128{ 129 if (rb->page) { 130 dma_unmap_page(q->dma_dev, rb->dma_addr, PAGE_SIZE, 131 DMA_FROM_DEVICE); 132 __page_frag_cache_drain(rb->page, rb->pg_refs); 133 rb->page = NULL; 134 } 135} 136 137/* Run the XDP program assigned to an Rx queue. 138 * Return %NULL if the buffer is consumed, or the virtual address of the packet 139 * to turn into an skb. 140 */ 141static void *fun_run_xdp(struct funeth_rxq *q, skb_frag_t *frags, void *buf_va, 142 int ref_ok, struct funeth_txq *xdp_q) 143{ 144 struct bpf_prog *xdp_prog; 145 struct xdp_frame *xdpf; 146 struct xdp_buff xdp; 147 u32 act; 148 149 /* VA includes the headroom, frag size includes headroom + tailroom */ 150 xdp_init_buff(&xdp, ALIGN(skb_frag_size(frags), FUN_EPRQ_PKT_ALIGN), 151 &q->xdp_rxq); 152 xdp_prepare_buff(&xdp, buf_va, FUN_XDP_HEADROOM, skb_frag_size(frags) - 153 (FUN_RX_TAILROOM + FUN_XDP_HEADROOM), false); 154 155 xdp_prog = READ_ONCE(q->xdp_prog); 156 act = bpf_prog_run_xdp(xdp_prog, &xdp); 157 158 switch (act) { 159 case XDP_PASS: 160 /* remove headroom, which may not be FUN_XDP_HEADROOM now */ 161 skb_frag_size_set(frags, xdp.data_end - xdp.data); 162 skb_frag_off_add(frags, xdp.data - xdp.data_hard_start); 163 goto pass; 164 case XDP_TX: 165 if (unlikely(!ref_ok)) 166 goto pass; 167 168 xdpf = xdp_convert_buff_to_frame(&xdp); 169 if (!xdpf || !fun_xdp_tx(xdp_q, xdpf)) 170 goto xdp_error; 171 FUN_QSTAT_INC(q, xdp_tx); 172 q->xdp_flush |= FUN_XDP_FLUSH_TX; 173 break; 174 case XDP_REDIRECT: 175 if (unlikely(!ref_ok)) 176 goto pass; 177 if (unlikely(xdp_do_redirect(q->netdev, &xdp, xdp_prog))) 178 goto xdp_error; 179 FUN_QSTAT_INC(q, xdp_redir); 180 q->xdp_flush |= FUN_XDP_FLUSH_REDIR; 181 break; 182 default: 183 bpf_warn_invalid_xdp_action(q->netdev, xdp_prog, act); 184 fallthrough; 185 case XDP_ABORTED: 186 trace_xdp_exception(q->netdev, xdp_prog, act); 187xdp_error: 188 q->cur_buf->pg_refs++; /* return frags' page reference */ 189 FUN_QSTAT_INC(q, xdp_err); 190 break; 191 case XDP_DROP: 192 q->cur_buf->pg_refs++; 193 FUN_QSTAT_INC(q, xdp_drops); 194 break; 195 } 196 return NULL; 197 198pass: 199 return xdp.data; 200} 201 202/* A CQE contains a fixed completion structure along with optional metadata and 203 * even packet data. Given the start address of a CQE return the start of the 204 * contained fixed structure, which lies at the end. 205 */ 206static const void *cqe_to_info(const void *cqe) 207{ 208 return cqe + FUNETH_CQE_INFO_OFFSET; 209} 210 211/* The inverse of cqe_to_info(). */ 212static const void *info_to_cqe(const void *cqe_info) 213{ 214 return cqe_info - FUNETH_CQE_INFO_OFFSET; 215} 216 217/* Return the type of hash provided by the device based on the L3 and L4 218 * protocols it parsed for the packet. 219 */ 220static enum pkt_hash_types cqe_to_pkt_hash_type(u16 pkt_parse) 221{ 222 static const enum pkt_hash_types htype_map[] = { 223 PKT_HASH_TYPE_NONE, PKT_HASH_TYPE_L3, 224 PKT_HASH_TYPE_NONE, PKT_HASH_TYPE_L4, 225 PKT_HASH_TYPE_NONE, PKT_HASH_TYPE_L3, 226 PKT_HASH_TYPE_NONE, PKT_HASH_TYPE_L3 227 }; 228 u16 key; 229 230 /* Build the key from the TCP/UDP and IP/IPv6 bits */ 231 key = ((pkt_parse >> FUN_ETH_RX_CV_OL4_PROT_S) & 6) | 232 ((pkt_parse >> (FUN_ETH_RX_CV_OL3_PROT_S + 1)) & 1); 233 234 return htype_map[key]; 235} 236 237/* Each received packet can be scattered across several Rx buffers or can 238 * share a buffer with previously received packets depending on the buffer 239 * and packet sizes and the room available in the most recently used buffer. 240 * 241 * The rules are: 242 * - If the buffer at the head of an RQ has not been used it gets (part of) the 243 * next incoming packet. 244 * - Otherwise, if the packet fully fits in the buffer's remaining space the 245 * packet is written there. 246 * - Otherwise, the packet goes into the next Rx buffer. 247 * 248 * This function returns the Rx buffer for a packet or fragment thereof of the 249 * given length. If it isn't @buf it either recycles or frees that buffer 250 * before advancing the queue to the next buffer. 251 * 252 * If called repeatedly with the remaining length of a packet it will walk 253 * through all the buffers containing the packet. 254 */ 255static struct funeth_rxbuf * 256get_buf(struct funeth_rxq *q, struct funeth_rxbuf *buf, unsigned int len) 257{ 258 if (q->buf_offset + len <= PAGE_SIZE || !q->buf_offset) 259 return buf; /* @buf holds (part of) the packet */ 260 261 /* The packet occupies part of the next buffer. Move there after 262 * replenishing the current buffer slot either with the spare page or 263 * by reusing the slot's existing page. Note that if a spare page isn't 264 * available and the current packet occupies @buf it is a multi-frag 265 * packet that will be dropped leaving @buf available for reuse. 266 */ 267 if ((page_ref_count(buf->page) == buf->pg_refs && 268 buf->node == numa_mem_id()) || !q->spare_buf.page) { 269 dma_sync_single_for_device(q->dma_dev, buf->dma_addr, 270 PAGE_SIZE, DMA_FROM_DEVICE); 271 refresh_refs(buf); 272 } else { 273 cache_offer(q, buf); 274 *buf = q->spare_buf; 275 q->spare_buf.page = NULL; 276 q->rqes[q->rq_cons & q->rq_mask] = 277 FUN_EPRQ_RQBUF_INIT(buf->dma_addr); 278 } 279 q->buf_offset = 0; 280 q->rq_cons++; 281 return &q->bufs[q->rq_cons & q->rq_mask]; 282} 283 284/* Gather the page fragments making up the first Rx packet on @q. Its total 285 * length @tot_len includes optional head- and tail-rooms. 286 * 287 * Return 0 if the device retains ownership of at least some of the pages. 288 * In this case the caller may only copy the packet. 289 * 290 * A non-zero return value gives the caller permission to use references to the 291 * pages, e.g., attach them to skbs. Additionally, if the value is <0 at least 292 * one of the pages is PF_MEMALLOC. 293 * 294 * Regardless of outcome the caller is granted a reference to each of the pages. 295 */ 296static int fun_gather_pkt(struct funeth_rxq *q, unsigned int tot_len, 297 skb_frag_t *frags) 298{ 299 struct funeth_rxbuf *buf = q->cur_buf; 300 unsigned int frag_len; 301 int ref_ok = 1; 302 303 for (;;) { 304 buf = get_buf(q, buf, tot_len); 305 306 /* We always keep the RQ full of buffers so before we can give 307 * one of our pages to the stack we require that we can obtain 308 * a replacement page. If we can't the packet will either be 309 * copied or dropped so we can retain ownership of the page and 310 * reuse it. 311 */ 312 if (!q->spare_buf.page && 313 funeth_alloc_page(q, &q->spare_buf, numa_mem_id(), 314 GFP_ATOMIC | __GFP_MEMALLOC)) 315 ref_ok = 0; 316 317 frag_len = min_t(unsigned int, tot_len, 318 PAGE_SIZE - q->buf_offset); 319 dma_sync_single_for_cpu(q->dma_dev, 320 buf->dma_addr + q->buf_offset, 321 frag_len, DMA_FROM_DEVICE); 322 buf->pg_refs--; 323 if (ref_ok) 324 ref_ok |= buf->node; 325 326 skb_frag_fill_page_desc(frags++, buf->page, q->buf_offset, 327 frag_len); 328 329 tot_len -= frag_len; 330 if (!tot_len) 331 break; 332 333 q->buf_offset = PAGE_SIZE; 334 } 335 q->buf_offset = ALIGN(q->buf_offset + frag_len, FUN_EPRQ_PKT_ALIGN); 336 q->cur_buf = buf; 337 return ref_ok; 338} 339 340static bool rx_hwtstamp_enabled(const struct net_device *dev) 341{ 342 const struct funeth_priv *d = netdev_priv(dev); 343 344 return d->hwtstamp_cfg.rx_filter == HWTSTAMP_FILTER_ALL; 345} 346 347/* Advance the CQ pointers and phase tag to the next CQE. */ 348static void advance_cq(struct funeth_rxq *q) 349{ 350 if (unlikely(q->cq_head == q->cq_mask)) { 351 q->cq_head = 0; 352 q->phase ^= 1; 353 q->next_cqe_info = cqe_to_info(q->cqes); 354 } else { 355 q->cq_head++; 356 q->next_cqe_info += FUNETH_CQE_SIZE; 357 } 358 prefetch(q->next_cqe_info); 359} 360 361/* Process the packet represented by the head CQE of @q. Gather the packet's 362 * fragments, run it through the optional XDP program, and if needed construct 363 * an skb and pass it to the stack. 364 */ 365static void fun_handle_cqe_pkt(struct funeth_rxq *q, struct funeth_txq *xdp_q) 366{ 367 const struct fun_eth_cqe *rxreq = info_to_cqe(q->next_cqe_info); 368 unsigned int i, tot_len, pkt_len = be32_to_cpu(rxreq->pkt_len); 369 struct net_device *ndev = q->netdev; 370 skb_frag_t frags[RX_MAX_FRAGS]; 371 struct skb_shared_info *si; 372 unsigned int headroom; 373 gro_result_t gro_res; 374 struct sk_buff *skb; 375 int ref_ok; 376 void *va; 377 u16 cv; 378 379 u64_stats_update_begin(&q->syncp); 380 q->stats.rx_pkts++; 381 q->stats.rx_bytes += pkt_len; 382 u64_stats_update_end(&q->syncp); 383 384 advance_cq(q); 385 386 /* account for head- and tail-room, present only for 1-buffer packets */ 387 tot_len = pkt_len; 388 headroom = be16_to_cpu(rxreq->headroom); 389 if (likely(headroom)) 390 tot_len += FUN_RX_TAILROOM + headroom; 391 392 ref_ok = fun_gather_pkt(q, tot_len, frags); 393 va = skb_frag_address(frags); 394 if (xdp_q && headroom == FUN_XDP_HEADROOM) { 395 va = fun_run_xdp(q, frags, va, ref_ok, xdp_q); 396 if (!va) 397 return; 398 headroom = 0; /* XDP_PASS trims it */ 399 } 400 if (unlikely(!ref_ok)) 401 goto no_mem; 402 403 if (likely(headroom)) { 404 /* headroom is either FUN_RX_HEADROOM or FUN_XDP_HEADROOM */ 405 prefetch(va + headroom); 406 skb = napi_build_skb(va, ALIGN(tot_len, FUN_EPRQ_PKT_ALIGN)); 407 if (unlikely(!skb)) 408 goto no_mem; 409 410 skb_reserve(skb, headroom); 411 __skb_put(skb, pkt_len); 412 skb->protocol = eth_type_trans(skb, ndev); 413 } else { 414 prefetch(va); 415 skb = napi_get_frags(q->napi); 416 if (unlikely(!skb)) 417 goto no_mem; 418 419 if (ref_ok < 0) 420 skb->pfmemalloc = 1; 421 422 si = skb_shinfo(skb); 423 si->nr_frags = rxreq->nsgl; 424 for (i = 0; i < si->nr_frags; i++) 425 si->frags[i] = frags[i]; 426 427 skb->len = pkt_len; 428 skb->data_len = pkt_len; 429 skb->truesize += round_up(pkt_len, FUN_EPRQ_PKT_ALIGN); 430 } 431 432 skb_record_rx_queue(skb, q->qidx); 433 cv = be16_to_cpu(rxreq->pkt_cv); 434 if (likely((q->netdev->features & NETIF_F_RXHASH) && rxreq->hash)) 435 skb_set_hash(skb, be32_to_cpu(rxreq->hash), 436 cqe_to_pkt_hash_type(cv)); 437 if (likely((q->netdev->features & NETIF_F_RXCSUM) && rxreq->csum)) { 438 FUN_QSTAT_INC(q, rx_cso); 439 skb->ip_summed = CHECKSUM_UNNECESSARY; 440 skb->csum_level = be16_to_cpu(rxreq->csum) - 1; 441 } 442 if (unlikely(rx_hwtstamp_enabled(q->netdev))) 443 skb_hwtstamps(skb)->hwtstamp = be64_to_cpu(rxreq->timestamp); 444 445 trace_funeth_rx(q, rxreq->nsgl, pkt_len, skb->hash, cv); 446 447 gro_res = skb->data_len ? napi_gro_frags(q->napi) : 448 napi_gro_receive(q->napi, skb); 449 if (gro_res == GRO_MERGED || gro_res == GRO_MERGED_FREE) 450 FUN_QSTAT_INC(q, gro_merged); 451 else if (gro_res == GRO_HELD) 452 FUN_QSTAT_INC(q, gro_pkts); 453 return; 454 455no_mem: 456 FUN_QSTAT_INC(q, rx_mem_drops); 457 458 /* Release the references we've been granted for the frag pages. 459 * We return the ref of the last frag and free the rest. 460 */ 461 q->cur_buf->pg_refs++; 462 for (i = 0; i < rxreq->nsgl - 1; i++) 463 __free_page(skb_frag_page(frags + i)); 464} 465 466/* Return 0 if the phase tag of the CQE at the CQ's head matches expectations 467 * indicating the CQE is new. 468 */ 469static u16 cqe_phase_mismatch(const struct fun_cqe_info *ci, u16 phase) 470{ 471 u16 sf_p = be16_to_cpu(ci->sf_p); 472 473 return (sf_p & 1) ^ phase; 474} 475 476/* Walk through a CQ identifying and processing fresh CQEs up to the given 477 * budget. Return the remaining budget. 478 */ 479static int fun_process_cqes(struct funeth_rxq *q, int budget) 480{ 481 struct funeth_priv *fp = netdev_priv(q->netdev); 482 struct funeth_txq **xdpqs, *xdp_q = NULL; 483 484 xdpqs = rcu_dereference_bh(fp->xdpqs); 485 if (xdpqs) 486 xdp_q = xdpqs[smp_processor_id()]; 487 488 while (budget && !cqe_phase_mismatch(q->next_cqe_info, q->phase)) { 489 /* access other descriptor fields after the phase check */ 490 dma_rmb(); 491 492 fun_handle_cqe_pkt(q, xdp_q); 493 budget--; 494 } 495 496 if (unlikely(q->xdp_flush)) { 497 if (q->xdp_flush & FUN_XDP_FLUSH_TX) 498 fun_txq_wr_db(xdp_q); 499 if (q->xdp_flush & FUN_XDP_FLUSH_REDIR) 500 xdp_do_flush(); 501 q->xdp_flush = 0; 502 } 503 504 return budget; 505} 506 507/* NAPI handler for Rx queues. Calls the CQE processing loop and writes RQ/CQ 508 * doorbells as needed. 509 */ 510int fun_rxq_napi_poll(struct napi_struct *napi, int budget) 511{ 512 struct fun_irq *irq = container_of(napi, struct fun_irq, napi); 513 struct funeth_rxq *q = irq->rxq; 514 int work_done = budget - fun_process_cqes(q, budget); 515 u32 cq_db_val = q->cq_head; 516 517 if (unlikely(work_done >= budget)) 518 FUN_QSTAT_INC(q, rx_budget); 519 else if (napi_complete_done(napi, work_done)) 520 cq_db_val |= q->irq_db_val; 521 522 /* check whether to post new Rx buffers */ 523 if (q->rq_cons - q->rq_cons_db >= q->rq_db_thres) { 524 u64_stats_update_begin(&q->syncp); 525 q->stats.rx_bufs += q->rq_cons - q->rq_cons_db; 526 u64_stats_update_end(&q->syncp); 527 q->rq_cons_db = q->rq_cons; 528 writel((q->rq_cons - 1) & q->rq_mask, q->rq_db); 529 } 530 531 writel(cq_db_val, q->cq_db); 532 return work_done; 533} 534 535/* Free the Rx buffers of an Rx queue. */ 536static void fun_rxq_free_bufs(struct funeth_rxq *q) 537{ 538 struct funeth_rxbuf *b = q->bufs; 539 unsigned int i; 540 541 for (i = 0; i <= q->rq_mask; i++, b++) 542 funeth_free_page(q, b); 543 544 funeth_free_page(q, &q->spare_buf); 545 q->cur_buf = NULL; 546} 547 548/* Initially provision an Rx queue with Rx buffers. */ 549static int fun_rxq_alloc_bufs(struct funeth_rxq *q, int node) 550{ 551 struct funeth_rxbuf *b = q->bufs; 552 unsigned int i; 553 554 for (i = 0; i <= q->rq_mask; i++, b++) { 555 if (funeth_alloc_page(q, b, node, GFP_KERNEL)) { 556 fun_rxq_free_bufs(q); 557 return -ENOMEM; 558 } 559 q->rqes[i] = FUN_EPRQ_RQBUF_INIT(b->dma_addr); 560 } 561 q->cur_buf = q->bufs; 562 return 0; 563} 564 565/* Initialize a used-buffer cache of the given depth. */ 566static int fun_rxq_init_cache(struct funeth_rx_cache *c, unsigned int depth, 567 int node) 568{ 569 c->mask = depth - 1; 570 c->bufs = kvzalloc_node(depth * sizeof(*c->bufs), GFP_KERNEL, node); 571 return c->bufs ? 0 : -ENOMEM; 572} 573 574/* Deallocate an Rx queue's used-buffer cache and its contents. */ 575static void fun_rxq_free_cache(struct funeth_rxq *q) 576{ 577 struct funeth_rxbuf *b = q->cache.bufs; 578 unsigned int i; 579 580 for (i = 0; i <= q->cache.mask; i++, b++) 581 funeth_free_page(q, b); 582 583 kvfree(q->cache.bufs); 584 q->cache.bufs = NULL; 585} 586 587int fun_rxq_set_bpf(struct funeth_rxq *q, struct bpf_prog *prog) 588{ 589 struct funeth_priv *fp = netdev_priv(q->netdev); 590 struct fun_admin_epcq_req cmd; 591 u16 headroom; 592 int err; 593 594 headroom = prog ? FUN_XDP_HEADROOM : FUN_RX_HEADROOM; 595 if (headroom != q->headroom) { 596 cmd.common = FUN_ADMIN_REQ_COMMON_INIT2(FUN_ADMIN_OP_EPCQ, 597 sizeof(cmd)); 598 cmd.u.modify = 599 FUN_ADMIN_EPCQ_MODIFY_REQ_INIT(FUN_ADMIN_SUBOP_MODIFY, 600 0, q->hw_cqid, headroom); 601 err = fun_submit_admin_sync_cmd(fp->fdev, &cmd.common, NULL, 0, 602 0); 603 if (err) 604 return err; 605 q->headroom = headroom; 606 } 607 608 WRITE_ONCE(q->xdp_prog, prog); 609 return 0; 610} 611 612/* Create an Rx queue, allocating the host memory it needs. */ 613static struct funeth_rxq *fun_rxq_create_sw(struct net_device *dev, 614 unsigned int qidx, 615 unsigned int ncqe, 616 unsigned int nrqe, 617 struct fun_irq *irq) 618{ 619 struct funeth_priv *fp = netdev_priv(dev); 620 struct funeth_rxq *q; 621 int err = -ENOMEM; 622 int numa_node; 623 624 numa_node = fun_irq_node(irq); 625 q = kzalloc_node(sizeof(*q), GFP_KERNEL, numa_node); 626 if (!q) 627 goto err; 628 629 q->qidx = qidx; 630 q->netdev = dev; 631 q->cq_mask = ncqe - 1; 632 q->rq_mask = nrqe - 1; 633 q->numa_node = numa_node; 634 q->rq_db_thres = nrqe / 4; 635 u64_stats_init(&q->syncp); 636 q->dma_dev = &fp->pdev->dev; 637 638 q->rqes = fun_alloc_ring_mem(q->dma_dev, nrqe, sizeof(*q->rqes), 639 sizeof(*q->bufs), false, numa_node, 640 &q->rq_dma_addr, (void **)&q->bufs, NULL); 641 if (!q->rqes) 642 goto free_q; 643 644 q->cqes = fun_alloc_ring_mem(q->dma_dev, ncqe, FUNETH_CQE_SIZE, 0, 645 false, numa_node, &q->cq_dma_addr, NULL, 646 NULL); 647 if (!q->cqes) 648 goto free_rqes; 649 650 err = fun_rxq_init_cache(&q->cache, nrqe, numa_node); 651 if (err) 652 goto free_cqes; 653 654 err = fun_rxq_alloc_bufs(q, numa_node); 655 if (err) 656 goto free_cache; 657 658 q->stats.rx_bufs = q->rq_mask; 659 q->init_state = FUN_QSTATE_INIT_SW; 660 return q; 661 662free_cache: 663 fun_rxq_free_cache(q); 664free_cqes: 665 dma_free_coherent(q->dma_dev, ncqe * FUNETH_CQE_SIZE, q->cqes, 666 q->cq_dma_addr); 667free_rqes: 668 fun_free_ring_mem(q->dma_dev, nrqe, sizeof(*q->rqes), false, q->rqes, 669 q->rq_dma_addr, q->bufs); 670free_q: 671 kfree(q); 672err: 673 netdev_err(dev, "Unable to allocate memory for Rx queue %u\n", qidx); 674 return ERR_PTR(err); 675} 676 677static void fun_rxq_free_sw(struct funeth_rxq *q) 678{ 679 struct funeth_priv *fp = netdev_priv(q->netdev); 680 681 fun_rxq_free_cache(q); 682 fun_rxq_free_bufs(q); 683 fun_free_ring_mem(q->dma_dev, q->rq_mask + 1, sizeof(*q->rqes), false, 684 q->rqes, q->rq_dma_addr, q->bufs); 685 dma_free_coherent(q->dma_dev, (q->cq_mask + 1) * FUNETH_CQE_SIZE, 686 q->cqes, q->cq_dma_addr); 687 688 /* Before freeing the queue transfer key counters to the device. */ 689 fp->rx_packets += q->stats.rx_pkts; 690 fp->rx_bytes += q->stats.rx_bytes; 691 fp->rx_dropped += q->stats.rx_map_err + q->stats.rx_mem_drops; 692 693 kfree(q); 694} 695 696/* Create an Rx queue's resources on the device. */ 697int fun_rxq_create_dev(struct funeth_rxq *q, struct fun_irq *irq) 698{ 699 struct funeth_priv *fp = netdev_priv(q->netdev); 700 unsigned int ncqe = q->cq_mask + 1; 701 unsigned int nrqe = q->rq_mask + 1; 702 int err; 703 704 err = xdp_rxq_info_reg(&q->xdp_rxq, q->netdev, q->qidx, 705 irq->napi.napi_id); 706 if (err) 707 goto out; 708 709 err = xdp_rxq_info_reg_mem_model(&q->xdp_rxq, MEM_TYPE_PAGE_SHARED, 710 NULL); 711 if (err) 712 goto xdp_unreg; 713 714 q->phase = 1; 715 q->irq_cnt = 0; 716 q->cq_head = 0; 717 q->rq_cons = 0; 718 q->rq_cons_db = 0; 719 q->buf_offset = 0; 720 q->napi = &irq->napi; 721 q->irq_db_val = fp->cq_irq_db; 722 q->next_cqe_info = cqe_to_info(q->cqes); 723 724 q->xdp_prog = fp->xdp_prog; 725 q->headroom = fp->xdp_prog ? FUN_XDP_HEADROOM : FUN_RX_HEADROOM; 726 727 err = fun_sq_create(fp->fdev, FUN_ADMIN_RES_CREATE_FLAG_ALLOCATOR | 728 FUN_ADMIN_EPSQ_CREATE_FLAG_RQ, 0, 729 FUN_HCI_ID_INVALID, 0, nrqe, q->rq_dma_addr, 0, 0, 730 0, 0, fp->fdev->kern_end_qid, PAGE_SHIFT, 731 &q->hw_sqid, &q->rq_db); 732 if (err) 733 goto xdp_unreg; 734 735 err = fun_cq_create(fp->fdev, FUN_ADMIN_RES_CREATE_FLAG_ALLOCATOR | 736 FUN_ADMIN_EPCQ_CREATE_FLAG_RQ, 0, 737 q->hw_sqid, ilog2(FUNETH_CQE_SIZE), ncqe, 738 q->cq_dma_addr, q->headroom, FUN_RX_TAILROOM, 0, 0, 739 irq->irq_idx, 0, fp->fdev->kern_end_qid, 740 &q->hw_cqid, &q->cq_db); 741 if (err) 742 goto free_rq; 743 744 irq->rxq = q; 745 writel(q->rq_mask, q->rq_db); 746 q->init_state = FUN_QSTATE_INIT_FULL; 747 748 netif_info(fp, ifup, q->netdev, 749 "Rx queue %u, depth %u/%u, HW qid %u/%u, IRQ idx %u, node %d, headroom %u\n", 750 q->qidx, ncqe, nrqe, q->hw_cqid, q->hw_sqid, irq->irq_idx, 751 q->numa_node, q->headroom); 752 return 0; 753 754free_rq: 755 fun_destroy_sq(fp->fdev, q->hw_sqid); 756xdp_unreg: 757 xdp_rxq_info_unreg(&q->xdp_rxq); 758out: 759 netdev_err(q->netdev, 760 "Failed to create Rx queue %u on device, error %d\n", 761 q->qidx, err); 762 return err; 763} 764 765static void fun_rxq_free_dev(struct funeth_rxq *q) 766{ 767 struct funeth_priv *fp = netdev_priv(q->netdev); 768 struct fun_irq *irq; 769 770 if (q->init_state < FUN_QSTATE_INIT_FULL) 771 return; 772 773 irq = container_of(q->napi, struct fun_irq, napi); 774 netif_info(fp, ifdown, q->netdev, 775 "Freeing Rx queue %u (id %u/%u), IRQ %u\n", 776 q->qidx, q->hw_cqid, q->hw_sqid, irq->irq_idx); 777 778 irq->rxq = NULL; 779 xdp_rxq_info_unreg(&q->xdp_rxq); 780 fun_destroy_sq(fp->fdev, q->hw_sqid); 781 fun_destroy_cq(fp->fdev, q->hw_cqid); 782 q->init_state = FUN_QSTATE_INIT_SW; 783} 784 785/* Create or advance an Rx queue, allocating all the host and device resources 786 * needed to reach the target state. 787 */ 788int funeth_rxq_create(struct net_device *dev, unsigned int qidx, 789 unsigned int ncqe, unsigned int nrqe, struct fun_irq *irq, 790 int state, struct funeth_rxq **qp) 791{ 792 struct funeth_rxq *q = *qp; 793 int err; 794 795 if (!q) { 796 q = fun_rxq_create_sw(dev, qidx, ncqe, nrqe, irq); 797 if (IS_ERR(q)) 798 return PTR_ERR(q); 799 } 800 801 if (q->init_state >= state) 802 goto out; 803 804 err = fun_rxq_create_dev(q, irq); 805 if (err) { 806 if (!*qp) 807 fun_rxq_free_sw(q); 808 return err; 809 } 810 811out: 812 *qp = q; 813 return 0; 814} 815 816/* Free Rx queue resources until it reaches the target state. */ 817struct funeth_rxq *funeth_rxq_free(struct funeth_rxq *q, int state) 818{ 819 if (state < FUN_QSTATE_INIT_FULL) 820 fun_rxq_free_dev(q); 821 822 if (state == FUN_QSTATE_DESTROYED) { 823 fun_rxq_free_sw(q); 824 q = NULL; 825 } 826 827 return q; 828} 829