1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2019, Intel Corporation. */ 3 4 #include <linux/bpf_trace.h> 5 #include <net/xdp_sock_drv.h> 6 #include <net/xdp.h> 7 #include "ice.h" 8 #include "ice_base.h" 9 #include "ice_type.h" 10 #include "ice_xsk.h" 11 #include "ice_txrx.h" 12 #include "ice_txrx_lib.h" 13 #include "ice_lib.h" 14 15 /** 16 * ice_qp_reset_stats - Resets all stats for rings of given index 17 * @vsi: VSI that contains rings of interest 18 * @q_idx: ring index in array 19 */ 20 static void ice_qp_reset_stats(struct ice_vsi *vsi, u16 q_idx) 21 { 22 memset(&vsi->rx_rings[q_idx]->rx_stats, 0, 23 sizeof(vsi->rx_rings[q_idx]->rx_stats)); 24 memset(&vsi->tx_rings[q_idx]->stats, 0, 25 sizeof(vsi->tx_rings[q_idx]->stats)); 26 if (ice_is_xdp_ena_vsi(vsi)) 27 memset(&vsi->xdp_rings[q_idx]->stats, 0, 28 sizeof(vsi->xdp_rings[q_idx]->stats)); 29 } 30 31 /** 32 * ice_qp_clean_rings - Cleans all the rings of a given index 33 * @vsi: VSI that contains rings of interest 34 * @q_idx: ring index in array 35 */ 36 static void ice_qp_clean_rings(struct ice_vsi *vsi, u16 q_idx) 37 { 38 ice_clean_tx_ring(vsi->tx_rings[q_idx]); 39 if (ice_is_xdp_ena_vsi(vsi)) 40 ice_clean_tx_ring(vsi->xdp_rings[q_idx]); 41 ice_clean_rx_ring(vsi->rx_rings[q_idx]); 42 } 43 44 /** 45 * ice_qvec_toggle_napi - Enables/disables NAPI for a given q_vector 46 * @vsi: VSI that has netdev 47 * @q_vector: q_vector that has NAPI context 48 * @enable: true for enable, false for disable 49 */ 50 static void 51 ice_qvec_toggle_napi(struct ice_vsi *vsi, struct ice_q_vector *q_vector, 52 bool enable) 53 { 54 if (!vsi->netdev || !q_vector) 55 return; 56 57 if (enable) 58 napi_enable(&q_vector->napi); 59 else 60 napi_disable(&q_vector->napi); 61 } 62 63 /** 64 * ice_qvec_dis_irq - Mask off queue interrupt generation on given ring 65 * @vsi: the VSI that contains queue vector being un-configured 66 * @rx_ring: Rx ring that will have its IRQ disabled 67 * @q_vector: queue vector 68 */ 69 static void 70 ice_qvec_dis_irq(struct ice_vsi *vsi, struct ice_ring *rx_ring, 71 struct ice_q_vector *q_vector) 72 { 73 struct ice_pf *pf = vsi->back; 74 struct ice_hw *hw = &pf->hw; 75 int base = vsi->base_vector; 76 u16 reg; 77 u32 val; 78 79 /* QINT_TQCTL is being cleared in ice_vsi_stop_tx_ring, so handle 80 * here only QINT_RQCTL 81 */ 82 reg = rx_ring->reg_idx; 83 val = rd32(hw, QINT_RQCTL(reg)); 84 val &= ~QINT_RQCTL_CAUSE_ENA_M; 85 wr32(hw, QINT_RQCTL(reg), val); 86 87 if (q_vector) { 88 u16 v_idx = q_vector->v_idx; 89 90 wr32(hw, GLINT_DYN_CTL(q_vector->reg_idx), 0); 91 ice_flush(hw); 92 synchronize_irq(pf->msix_entries[v_idx + base].vector); 93 } 94 } 95 96 /** 97 * ice_qvec_cfg_msix - Enable IRQ for given queue vector 98 * @vsi: the VSI that contains queue vector 99 * @q_vector: queue vector 100 */ 101 static void 102 ice_qvec_cfg_msix(struct ice_vsi *vsi, struct ice_q_vector *q_vector) 103 { 104 u16 reg_idx = q_vector->reg_idx; 105 struct ice_pf *pf = vsi->back; 106 struct ice_hw *hw = &pf->hw; 107 struct ice_ring *ring; 108 109 ice_cfg_itr(hw, q_vector); 110 111 wr32(hw, GLINT_RATE(reg_idx), 112 ice_intrl_usec_to_reg(q_vector->intrl, hw->intrl_gran)); 113 114 ice_for_each_ring(ring, q_vector->tx) 115 ice_cfg_txq_interrupt(vsi, ring->reg_idx, reg_idx, 116 q_vector->tx.itr_idx); 117 118 ice_for_each_ring(ring, q_vector->rx) 119 ice_cfg_rxq_interrupt(vsi, ring->reg_idx, reg_idx, 120 q_vector->rx.itr_idx); 121 122 ice_flush(hw); 123 } 124 125 /** 126 * ice_qvec_ena_irq - Enable IRQ for given queue vector 127 * @vsi: the VSI that contains queue vector 128 * @q_vector: queue vector 129 */ 130 static void ice_qvec_ena_irq(struct ice_vsi *vsi, struct ice_q_vector *q_vector) 131 { 132 struct ice_pf *pf = vsi->back; 133 struct ice_hw *hw = &pf->hw; 134 135 ice_irq_dynamic_ena(hw, vsi, q_vector); 136 137 ice_flush(hw); 138 } 139 140 /** 141 * ice_qp_dis - Disables a queue pair 142 * @vsi: VSI of interest 143 * @q_idx: ring index in array 144 * 145 * Returns 0 on success, negative on failure. 146 */ 147 static int ice_qp_dis(struct ice_vsi *vsi, u16 q_idx) 148 { 149 struct ice_txq_meta txq_meta = { }; 150 struct ice_ring *tx_ring, *rx_ring; 151 struct ice_q_vector *q_vector; 152 int timeout = 50; 153 int err; 154 155 if (q_idx >= vsi->num_rxq || q_idx >= vsi->num_txq) 156 return -EINVAL; 157 158 tx_ring = vsi->tx_rings[q_idx]; 159 rx_ring = vsi->rx_rings[q_idx]; 160 q_vector = rx_ring->q_vector; 161 162 while (test_and_set_bit(__ICE_CFG_BUSY, vsi->state)) { 163 timeout--; 164 if (!timeout) 165 return -EBUSY; 166 usleep_range(1000, 2000); 167 } 168 netif_tx_stop_queue(netdev_get_tx_queue(vsi->netdev, q_idx)); 169 170 ice_qvec_dis_irq(vsi, rx_ring, q_vector); 171 172 ice_fill_txq_meta(vsi, tx_ring, &txq_meta); 173 err = ice_vsi_stop_tx_ring(vsi, ICE_NO_RESET, 0, tx_ring, &txq_meta); 174 if (err) 175 return err; 176 if (ice_is_xdp_ena_vsi(vsi)) { 177 struct ice_ring *xdp_ring = vsi->xdp_rings[q_idx]; 178 179 memset(&txq_meta, 0, sizeof(txq_meta)); 180 ice_fill_txq_meta(vsi, xdp_ring, &txq_meta); 181 err = ice_vsi_stop_tx_ring(vsi, ICE_NO_RESET, 0, xdp_ring, 182 &txq_meta); 183 if (err) 184 return err; 185 } 186 err = ice_vsi_ctrl_one_rx_ring(vsi, false, q_idx, true); 187 if (err) 188 return err; 189 190 ice_qvec_toggle_napi(vsi, q_vector, false); 191 ice_qp_clean_rings(vsi, q_idx); 192 ice_qp_reset_stats(vsi, q_idx); 193 194 return 0; 195 } 196 197 /** 198 * ice_qp_ena - Enables a queue pair 199 * @vsi: VSI of interest 200 * @q_idx: ring index in array 201 * 202 * Returns 0 on success, negative on failure. 203 */ 204 static int ice_qp_ena(struct ice_vsi *vsi, u16 q_idx) 205 { 206 struct ice_aqc_add_tx_qgrp *qg_buf; 207 struct ice_ring *tx_ring, *rx_ring; 208 struct ice_q_vector *q_vector; 209 u16 size; 210 int err; 211 212 if (q_idx >= vsi->num_rxq || q_idx >= vsi->num_txq) 213 return -EINVAL; 214 215 size = struct_size(qg_buf, txqs, 1); 216 qg_buf = kzalloc(size, GFP_KERNEL); 217 if (!qg_buf) 218 return -ENOMEM; 219 220 qg_buf->num_txqs = 1; 221 222 tx_ring = vsi->tx_rings[q_idx]; 223 rx_ring = vsi->rx_rings[q_idx]; 224 q_vector = rx_ring->q_vector; 225 226 err = ice_vsi_cfg_txq(vsi, tx_ring, qg_buf); 227 if (err) 228 goto free_buf; 229 230 if (ice_is_xdp_ena_vsi(vsi)) { 231 struct ice_ring *xdp_ring = vsi->xdp_rings[q_idx]; 232 233 memset(qg_buf, 0, size); 234 qg_buf->num_txqs = 1; 235 err = ice_vsi_cfg_txq(vsi, xdp_ring, qg_buf); 236 if (err) 237 goto free_buf; 238 ice_set_ring_xdp(xdp_ring); 239 xdp_ring->xsk_pool = ice_xsk_pool(xdp_ring); 240 } 241 242 err = ice_setup_rx_ctx(rx_ring); 243 if (err) 244 goto free_buf; 245 246 ice_qvec_cfg_msix(vsi, q_vector); 247 248 err = ice_vsi_ctrl_one_rx_ring(vsi, true, q_idx, true); 249 if (err) 250 goto free_buf; 251 252 clear_bit(__ICE_CFG_BUSY, vsi->state); 253 ice_qvec_toggle_napi(vsi, q_vector, true); 254 ice_qvec_ena_irq(vsi, q_vector); 255 256 netif_tx_start_queue(netdev_get_tx_queue(vsi->netdev, q_idx)); 257 free_buf: 258 kfree(qg_buf); 259 return err; 260 } 261 262 /** 263 * ice_xsk_pool_disable - disable a buffer pool region 264 * @vsi: Current VSI 265 * @qid: queue ID 266 * 267 * Returns 0 on success, negative on failure 268 */ 269 static int ice_xsk_pool_disable(struct ice_vsi *vsi, u16 qid) 270 { 271 struct xsk_buff_pool *pool = xsk_get_pool_from_qid(vsi->netdev, qid); 272 273 if (!pool) 274 return -EINVAL; 275 276 xsk_pool_dma_unmap(pool, ICE_RX_DMA_ATTR); 277 278 return 0; 279 } 280 281 /** 282 * ice_xsk_pool_enable - enable a buffer pool region 283 * @vsi: Current VSI 284 * @pool: pointer to a requested buffer pool region 285 * @qid: queue ID 286 * 287 * Returns 0 on success, negative on failure 288 */ 289 static int 290 ice_xsk_pool_enable(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid) 291 { 292 int err; 293 294 if (vsi->type != ICE_VSI_PF) 295 return -EINVAL; 296 297 if (qid >= vsi->netdev->real_num_rx_queues || 298 qid >= vsi->netdev->real_num_tx_queues) 299 return -EINVAL; 300 301 err = xsk_pool_dma_map(pool, ice_pf_to_dev(vsi->back), 302 ICE_RX_DMA_ATTR); 303 if (err) 304 return err; 305 306 return 0; 307 } 308 309 /** 310 * ice_xsk_pool_setup - enable/disable a buffer pool region depending on its state 311 * @vsi: Current VSI 312 * @pool: buffer pool to enable/associate to a ring, NULL to disable 313 * @qid: queue ID 314 * 315 * Returns 0 on success, negative on failure 316 */ 317 int ice_xsk_pool_setup(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid) 318 { 319 bool if_running, pool_present = !!pool; 320 int ret = 0, pool_failure = 0; 321 322 if_running = netif_running(vsi->netdev) && ice_is_xdp_ena_vsi(vsi); 323 324 if (if_running) { 325 ret = ice_qp_dis(vsi, qid); 326 if (ret) { 327 netdev_err(vsi->netdev, "ice_qp_dis error = %d\n", ret); 328 goto xsk_pool_if_up; 329 } 330 } 331 332 pool_failure = pool_present ? ice_xsk_pool_enable(vsi, pool, qid) : 333 ice_xsk_pool_disable(vsi, qid); 334 335 xsk_pool_if_up: 336 if (if_running) { 337 ret = ice_qp_ena(vsi, qid); 338 if (!ret && pool_present) 339 napi_schedule(&vsi->xdp_rings[qid]->q_vector->napi); 340 else if (ret) 341 netdev_err(vsi->netdev, "ice_qp_ena error = %d\n", ret); 342 } 343 344 if (pool_failure) { 345 netdev_err(vsi->netdev, "Could not %sable buffer pool, error = %d\n", 346 pool_present ? "en" : "dis", pool_failure); 347 return pool_failure; 348 } 349 350 return ret; 351 } 352 353 /** 354 * ice_alloc_rx_bufs_zc - allocate a number of Rx buffers 355 * @rx_ring: Rx ring 356 * @count: The number of buffers to allocate 357 * 358 * This function allocates a number of Rx buffers from the fill ring 359 * or the internal recycle mechanism and places them on the Rx ring. 360 * 361 * Returns true if all allocations were successful, false if any fail. 362 */ 363 bool ice_alloc_rx_bufs_zc(struct ice_ring *rx_ring, u16 count) 364 { 365 union ice_32b_rx_flex_desc *rx_desc; 366 u16 ntu = rx_ring->next_to_use; 367 struct ice_rx_buf *rx_buf; 368 bool ok = true; 369 dma_addr_t dma; 370 371 if (!count) 372 return true; 373 374 rx_desc = ICE_RX_DESC(rx_ring, ntu); 375 rx_buf = &rx_ring->rx_buf[ntu]; 376 377 do { 378 rx_buf->xdp = xsk_buff_alloc(rx_ring->xsk_pool); 379 if (!rx_buf->xdp) { 380 ok = false; 381 break; 382 } 383 384 dma = xsk_buff_xdp_get_dma(rx_buf->xdp); 385 rx_desc->read.pkt_addr = cpu_to_le64(dma); 386 rx_desc->wb.status_error0 = 0; 387 388 rx_desc++; 389 rx_buf++; 390 ntu++; 391 392 if (unlikely(ntu == rx_ring->count)) { 393 rx_desc = ICE_RX_DESC(rx_ring, 0); 394 rx_buf = rx_ring->rx_buf; 395 ntu = 0; 396 } 397 } while (--count); 398 399 if (rx_ring->next_to_use != ntu) { 400 /* clear the status bits for the next_to_use descriptor */ 401 rx_desc->wb.status_error0 = 0; 402 ice_release_rx_desc(rx_ring, ntu); 403 } 404 405 return ok; 406 } 407 408 /** 409 * ice_bump_ntc - Bump the next_to_clean counter of an Rx ring 410 * @rx_ring: Rx ring 411 */ 412 static void ice_bump_ntc(struct ice_ring *rx_ring) 413 { 414 int ntc = rx_ring->next_to_clean + 1; 415 416 ntc = (ntc < rx_ring->count) ? ntc : 0; 417 rx_ring->next_to_clean = ntc; 418 prefetch(ICE_RX_DESC(rx_ring, ntc)); 419 } 420 421 /** 422 * ice_construct_skb_zc - Create an sk_buff from zero-copy buffer 423 * @rx_ring: Rx ring 424 * @rx_buf: zero-copy Rx buffer 425 * 426 * This function allocates a new skb from a zero-copy Rx buffer. 427 * 428 * Returns the skb on success, NULL on failure. 429 */ 430 static struct sk_buff * 431 ice_construct_skb_zc(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf) 432 { 433 unsigned int metasize = rx_buf->xdp->data - rx_buf->xdp->data_meta; 434 unsigned int datasize = rx_buf->xdp->data_end - rx_buf->xdp->data; 435 unsigned int datasize_hard = rx_buf->xdp->data_end - 436 rx_buf->xdp->data_hard_start; 437 struct sk_buff *skb; 438 439 skb = __napi_alloc_skb(&rx_ring->q_vector->napi, datasize_hard, 440 GFP_ATOMIC | __GFP_NOWARN); 441 if (unlikely(!skb)) 442 return NULL; 443 444 skb_reserve(skb, rx_buf->xdp->data - rx_buf->xdp->data_hard_start); 445 memcpy(__skb_put(skb, datasize), rx_buf->xdp->data, datasize); 446 if (metasize) 447 skb_metadata_set(skb, metasize); 448 449 xsk_buff_free(rx_buf->xdp); 450 rx_buf->xdp = NULL; 451 return skb; 452 } 453 454 /** 455 * ice_run_xdp_zc - Executes an XDP program in zero-copy path 456 * @rx_ring: Rx ring 457 * @xdp: xdp_buff used as input to the XDP program 458 * 459 * Returns any of ICE_XDP_{PASS, CONSUMED, TX, REDIR} 460 */ 461 static int 462 ice_run_xdp_zc(struct ice_ring *rx_ring, struct xdp_buff *xdp) 463 { 464 int err, result = ICE_XDP_PASS; 465 struct bpf_prog *xdp_prog; 466 struct ice_ring *xdp_ring; 467 u32 act; 468 469 rcu_read_lock(); 470 /* ZC patch is enabled only when XDP program is set, 471 * so here it can not be NULL 472 */ 473 xdp_prog = READ_ONCE(rx_ring->xdp_prog); 474 475 act = bpf_prog_run_xdp(xdp_prog, xdp); 476 switch (act) { 477 case XDP_PASS: 478 break; 479 case XDP_TX: 480 xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->q_index]; 481 result = ice_xmit_xdp_buff(xdp, xdp_ring); 482 break; 483 case XDP_REDIRECT: 484 err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog); 485 result = !err ? ICE_XDP_REDIR : ICE_XDP_CONSUMED; 486 break; 487 default: 488 bpf_warn_invalid_xdp_action(act); 489 fallthrough; 490 case XDP_ABORTED: 491 trace_xdp_exception(rx_ring->netdev, xdp_prog, act); 492 fallthrough; 493 case XDP_DROP: 494 result = ICE_XDP_CONSUMED; 495 break; 496 } 497 498 rcu_read_unlock(); 499 return result; 500 } 501 502 /** 503 * ice_clean_rx_irq_zc - consumes packets from the hardware ring 504 * @rx_ring: AF_XDP Rx ring 505 * @budget: NAPI budget 506 * 507 * Returns number of processed packets on success, remaining budget on failure. 508 */ 509 int ice_clean_rx_irq_zc(struct ice_ring *rx_ring, int budget) 510 { 511 unsigned int total_rx_bytes = 0, total_rx_packets = 0; 512 u16 cleaned_count = ICE_DESC_UNUSED(rx_ring); 513 unsigned int xdp_xmit = 0; 514 bool failure = false; 515 516 while (likely(total_rx_packets < (unsigned int)budget)) { 517 union ice_32b_rx_flex_desc *rx_desc; 518 unsigned int size, xdp_res = 0; 519 struct ice_rx_buf *rx_buf; 520 struct sk_buff *skb; 521 u16 stat_err_bits; 522 u16 vlan_tag = 0; 523 u8 rx_ptype; 524 525 rx_desc = ICE_RX_DESC(rx_ring, rx_ring->next_to_clean); 526 527 stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_DD_S); 528 if (!ice_test_staterr(rx_desc, stat_err_bits)) 529 break; 530 531 /* This memory barrier is needed to keep us from reading 532 * any other fields out of the rx_desc until we have 533 * verified the descriptor has been written back. 534 */ 535 dma_rmb(); 536 537 size = le16_to_cpu(rx_desc->wb.pkt_len) & 538 ICE_RX_FLX_DESC_PKT_LEN_M; 539 if (!size) 540 break; 541 542 rx_buf = &rx_ring->rx_buf[rx_ring->next_to_clean]; 543 rx_buf->xdp->data_end = rx_buf->xdp->data + size; 544 xsk_buff_dma_sync_for_cpu(rx_buf->xdp, rx_ring->xsk_pool); 545 546 xdp_res = ice_run_xdp_zc(rx_ring, rx_buf->xdp); 547 if (xdp_res) { 548 if (xdp_res & (ICE_XDP_TX | ICE_XDP_REDIR)) 549 xdp_xmit |= xdp_res; 550 else 551 xsk_buff_free(rx_buf->xdp); 552 553 rx_buf->xdp = NULL; 554 total_rx_bytes += size; 555 total_rx_packets++; 556 cleaned_count++; 557 558 ice_bump_ntc(rx_ring); 559 continue; 560 } 561 562 /* XDP_PASS path */ 563 skb = ice_construct_skb_zc(rx_ring, rx_buf); 564 if (!skb) { 565 rx_ring->rx_stats.alloc_buf_failed++; 566 break; 567 } 568 569 cleaned_count++; 570 ice_bump_ntc(rx_ring); 571 572 if (eth_skb_pad(skb)) { 573 skb = NULL; 574 continue; 575 } 576 577 total_rx_bytes += skb->len; 578 total_rx_packets++; 579 580 stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_L2TAG1P_S); 581 if (ice_test_staterr(rx_desc, stat_err_bits)) 582 vlan_tag = le16_to_cpu(rx_desc->wb.l2tag1); 583 584 rx_ptype = le16_to_cpu(rx_desc->wb.ptype_flex_flags0) & 585 ICE_RX_FLEX_DESC_PTYPE_M; 586 587 ice_process_skb_fields(rx_ring, rx_desc, skb, rx_ptype); 588 ice_receive_skb(rx_ring, skb, vlan_tag); 589 } 590 591 if (cleaned_count >= ICE_RX_BUF_WRITE) 592 failure = !ice_alloc_rx_bufs_zc(rx_ring, cleaned_count); 593 594 ice_finalize_xdp_rx(rx_ring, xdp_xmit); 595 ice_update_rx_ring_stats(rx_ring, total_rx_packets, total_rx_bytes); 596 597 if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) { 598 if (failure || rx_ring->next_to_clean == rx_ring->next_to_use) 599 xsk_set_rx_need_wakeup(rx_ring->xsk_pool); 600 else 601 xsk_clear_rx_need_wakeup(rx_ring->xsk_pool); 602 603 return (int)total_rx_packets; 604 } 605 606 return failure ? budget : (int)total_rx_packets; 607 } 608 609 /** 610 * ice_xmit_zc - Completes AF_XDP entries, and cleans XDP entries 611 * @xdp_ring: XDP Tx ring 612 * @budget: max number of frames to xmit 613 * 614 * Returns true if cleanup/transmission is done. 615 */ 616 static bool ice_xmit_zc(struct ice_ring *xdp_ring, int budget) 617 { 618 struct ice_tx_desc *tx_desc = NULL; 619 bool work_done = true; 620 struct xdp_desc desc; 621 dma_addr_t dma; 622 623 while (likely(budget-- > 0)) { 624 struct ice_tx_buf *tx_buf; 625 626 if (unlikely(!ICE_DESC_UNUSED(xdp_ring))) { 627 xdp_ring->tx_stats.tx_busy++; 628 work_done = false; 629 break; 630 } 631 632 tx_buf = &xdp_ring->tx_buf[xdp_ring->next_to_use]; 633 634 if (!xsk_tx_peek_desc(xdp_ring->xsk_pool, &desc)) 635 break; 636 637 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc.addr); 638 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, 639 desc.len); 640 641 tx_buf->bytecount = desc.len; 642 643 tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_to_use); 644 tx_desc->buf_addr = cpu_to_le64(dma); 645 tx_desc->cmd_type_offset_bsz = 646 ice_build_ctob(ICE_TXD_LAST_DESC_CMD, 0, desc.len, 0); 647 648 xdp_ring->next_to_use++; 649 if (xdp_ring->next_to_use == xdp_ring->count) 650 xdp_ring->next_to_use = 0; 651 } 652 653 if (tx_desc) { 654 ice_xdp_ring_update_tail(xdp_ring); 655 xsk_tx_release(xdp_ring->xsk_pool); 656 } 657 658 return budget > 0 && work_done; 659 } 660 661 /** 662 * ice_clean_xdp_tx_buf - Free and unmap XDP Tx buffer 663 * @xdp_ring: XDP Tx ring 664 * @tx_buf: Tx buffer to clean 665 */ 666 static void 667 ice_clean_xdp_tx_buf(struct ice_ring *xdp_ring, struct ice_tx_buf *tx_buf) 668 { 669 xdp_return_frame((struct xdp_frame *)tx_buf->raw_buf); 670 dma_unmap_single(xdp_ring->dev, dma_unmap_addr(tx_buf, dma), 671 dma_unmap_len(tx_buf, len), DMA_TO_DEVICE); 672 dma_unmap_len_set(tx_buf, len, 0); 673 } 674 675 /** 676 * ice_clean_tx_irq_zc - Completes AF_XDP entries, and cleans XDP entries 677 * @xdp_ring: XDP Tx ring 678 * @budget: NAPI budget 679 * 680 * Returns true if cleanup/tranmission is done. 681 */ 682 bool ice_clean_tx_irq_zc(struct ice_ring *xdp_ring, int budget) 683 { 684 int total_packets = 0, total_bytes = 0; 685 s16 ntc = xdp_ring->next_to_clean; 686 struct ice_tx_desc *tx_desc; 687 struct ice_tx_buf *tx_buf; 688 u32 xsk_frames = 0; 689 bool xmit_done; 690 691 tx_desc = ICE_TX_DESC(xdp_ring, ntc); 692 tx_buf = &xdp_ring->tx_buf[ntc]; 693 ntc -= xdp_ring->count; 694 695 do { 696 if (!(tx_desc->cmd_type_offset_bsz & 697 cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE))) 698 break; 699 700 total_bytes += tx_buf->bytecount; 701 total_packets++; 702 703 if (tx_buf->raw_buf) { 704 ice_clean_xdp_tx_buf(xdp_ring, tx_buf); 705 tx_buf->raw_buf = NULL; 706 } else { 707 xsk_frames++; 708 } 709 710 tx_desc->cmd_type_offset_bsz = 0; 711 tx_buf++; 712 tx_desc++; 713 ntc++; 714 715 if (unlikely(!ntc)) { 716 ntc -= xdp_ring->count; 717 tx_buf = xdp_ring->tx_buf; 718 tx_desc = ICE_TX_DESC(xdp_ring, 0); 719 } 720 721 prefetch(tx_desc); 722 723 } while (likely(--budget)); 724 725 ntc += xdp_ring->count; 726 xdp_ring->next_to_clean = ntc; 727 728 if (xsk_frames) 729 xsk_tx_completed(xdp_ring->xsk_pool, xsk_frames); 730 731 if (xsk_uses_need_wakeup(xdp_ring->xsk_pool)) 732 xsk_set_tx_need_wakeup(xdp_ring->xsk_pool); 733 734 ice_update_tx_ring_stats(xdp_ring, total_packets, total_bytes); 735 xmit_done = ice_xmit_zc(xdp_ring, ICE_DFLT_IRQ_WORK); 736 737 return budget > 0 && xmit_done; 738 } 739 740 /** 741 * ice_xsk_wakeup - Implements ndo_xsk_wakeup 742 * @netdev: net_device 743 * @queue_id: queue to wake up 744 * @flags: ignored in our case, since we have Rx and Tx in the same NAPI 745 * 746 * Returns negative on error, zero otherwise. 747 */ 748 int 749 ice_xsk_wakeup(struct net_device *netdev, u32 queue_id, 750 u32 __always_unused flags) 751 { 752 struct ice_netdev_priv *np = netdev_priv(netdev); 753 struct ice_q_vector *q_vector; 754 struct ice_vsi *vsi = np->vsi; 755 struct ice_ring *ring; 756 757 if (test_bit(__ICE_DOWN, vsi->state)) 758 return -ENETDOWN; 759 760 if (!ice_is_xdp_ena_vsi(vsi)) 761 return -ENXIO; 762 763 if (queue_id >= vsi->num_txq) 764 return -ENXIO; 765 766 if (!vsi->xdp_rings[queue_id]->xsk_pool) 767 return -ENXIO; 768 769 ring = vsi->xdp_rings[queue_id]; 770 771 /* The idea here is that if NAPI is running, mark a miss, so 772 * it will run again. If not, trigger an interrupt and 773 * schedule the NAPI from interrupt context. If NAPI would be 774 * scheduled here, the interrupt affinity would not be 775 * honored. 776 */ 777 q_vector = ring->q_vector; 778 if (!napi_if_scheduled_mark_missed(&q_vector->napi)) 779 ice_trigger_sw_intr(&vsi->back->hw, q_vector); 780 781 return 0; 782 } 783 784 /** 785 * ice_xsk_any_rx_ring_ena - Checks if Rx rings have AF_XDP buff pool attached 786 * @vsi: VSI to be checked 787 * 788 * Returns true if any of the Rx rings has an AF_XDP buff pool attached 789 */ 790 bool ice_xsk_any_rx_ring_ena(struct ice_vsi *vsi) 791 { 792 int i; 793 794 ice_for_each_rxq(vsi, i) { 795 if (xsk_get_pool_from_qid(vsi->netdev, i)) 796 return true; 797 } 798 799 return false; 800 } 801 802 /** 803 * ice_xsk_clean_rx_ring - clean buffer pool queues connected to a given Rx ring 804 * @rx_ring: ring to be cleaned 805 */ 806 void ice_xsk_clean_rx_ring(struct ice_ring *rx_ring) 807 { 808 u16 i; 809 810 for (i = 0; i < rx_ring->count; i++) { 811 struct ice_rx_buf *rx_buf = &rx_ring->rx_buf[i]; 812 813 if (!rx_buf->xdp) 814 continue; 815 816 rx_buf->xdp = NULL; 817 } 818 } 819 820 /** 821 * ice_xsk_clean_xdp_ring - Clean the XDP Tx ring and its buffer pool queues 822 * @xdp_ring: XDP_Tx ring 823 */ 824 void ice_xsk_clean_xdp_ring(struct ice_ring *xdp_ring) 825 { 826 u16 ntc = xdp_ring->next_to_clean, ntu = xdp_ring->next_to_use; 827 u32 xsk_frames = 0; 828 829 while (ntc != ntu) { 830 struct ice_tx_buf *tx_buf = &xdp_ring->tx_buf[ntc]; 831 832 if (tx_buf->raw_buf) 833 ice_clean_xdp_tx_buf(xdp_ring, tx_buf); 834 else 835 xsk_frames++; 836 837 tx_buf->raw_buf = NULL; 838 839 ntc++; 840 if (ntc >= xdp_ring->count) 841 ntc = 0; 842 } 843 844 if (xsk_frames) 845 xsk_tx_completed(xdp_ring->xsk_pool, xsk_frames); 846 } 847