// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2018, Intel Corporation. */ /* The driver transmit and receive code */ #include #include #include #include #include #include #include #include "ice_txrx_lib.h" #include "ice_lib.h" #include "ice.h" #include "ice_trace.h" #include "ice_dcb_lib.h" #include "ice_xsk.h" #include "ice_eswitch.h" #define ICE_RX_HDR_SIZE 256 #define FDIR_DESC_RXDID 0x40 #define ICE_FDIR_CLEAN_DELAY 10 /** * ice_prgm_fdir_fltr - Program a Flow Director filter * @vsi: VSI to send dummy packet * @fdir_desc: flow director descriptor * @raw_packet: allocated buffer for flow director */ int ice_prgm_fdir_fltr(struct ice_vsi *vsi, struct ice_fltr_desc *fdir_desc, u8 *raw_packet) { struct ice_tx_buf *tx_buf, *first; struct ice_fltr_desc *f_desc; struct ice_tx_desc *tx_desc; struct ice_tx_ring *tx_ring; struct device *dev; dma_addr_t dma; u32 td_cmd; u16 i; /* VSI and Tx ring */ if (!vsi) return -ENOENT; tx_ring = vsi->tx_rings[0]; if (!tx_ring || !tx_ring->desc) return -ENOENT; dev = tx_ring->dev; /* we are using two descriptors to add/del a filter and we can wait */ for (i = ICE_FDIR_CLEAN_DELAY; ICE_DESC_UNUSED(tx_ring) < 2; i--) { if (!i) return -EAGAIN; msleep_interruptible(1); } dma = dma_map_single(dev, raw_packet, ICE_FDIR_MAX_RAW_PKT_SIZE, DMA_TO_DEVICE); if (dma_mapping_error(dev, dma)) return -EINVAL; /* grab the next descriptor */ i = tx_ring->next_to_use; first = &tx_ring->tx_buf[i]; f_desc = ICE_TX_FDIRDESC(tx_ring, i); memcpy(f_desc, fdir_desc, sizeof(*f_desc)); i++; i = (i < tx_ring->count) ? i : 0; tx_desc = ICE_TX_DESC(tx_ring, i); tx_buf = &tx_ring->tx_buf[i]; i++; tx_ring->next_to_use = (i < tx_ring->count) ? i : 0; memset(tx_buf, 0, sizeof(*tx_buf)); dma_unmap_len_set(tx_buf, len, ICE_FDIR_MAX_RAW_PKT_SIZE); dma_unmap_addr_set(tx_buf, dma, dma); tx_desc->buf_addr = cpu_to_le64(dma); td_cmd = ICE_TXD_LAST_DESC_CMD | ICE_TX_DESC_CMD_DUMMY | ICE_TX_DESC_CMD_RE; tx_buf->type = ICE_TX_BUF_DUMMY; tx_buf->raw_buf = raw_packet; tx_desc->cmd_type_offset_bsz = ice_build_ctob(td_cmd, 0, ICE_FDIR_MAX_RAW_PKT_SIZE, 0); /* Force memory write to complete before letting h/w know * there are new descriptors to fetch. */ wmb(); /* mark the data descriptor to be watched */ first->next_to_watch = tx_desc; writel(tx_ring->next_to_use, tx_ring->tail); return 0; } /** * ice_unmap_and_free_tx_buf - Release a Tx buffer * @ring: the ring that owns the buffer * @tx_buf: the buffer to free */ static void ice_unmap_and_free_tx_buf(struct ice_tx_ring *ring, struct ice_tx_buf *tx_buf) { if (dma_unmap_len(tx_buf, len)) dma_unmap_page(ring->dev, dma_unmap_addr(tx_buf, dma), dma_unmap_len(tx_buf, len), DMA_TO_DEVICE); switch (tx_buf->type) { case ICE_TX_BUF_DUMMY: devm_kfree(ring->dev, tx_buf->raw_buf); break; case ICE_TX_BUF_SKB: dev_kfree_skb_any(tx_buf->skb); break; case ICE_TX_BUF_XDP_TX: page_frag_free(tx_buf->raw_buf); break; case ICE_TX_BUF_XDP_XMIT: xdp_return_frame(tx_buf->xdpf); break; } tx_buf->next_to_watch = NULL; tx_buf->type = ICE_TX_BUF_EMPTY; dma_unmap_len_set(tx_buf, len, 0); /* tx_buf must be completely set up in the transmit path */ } static struct netdev_queue *txring_txq(const struct ice_tx_ring *ring) { return netdev_get_tx_queue(ring->netdev, ring->q_index); } /** * ice_clean_tx_ring - Free any empty Tx buffers * @tx_ring: ring to be cleaned */ void ice_clean_tx_ring(struct ice_tx_ring *tx_ring) { u32 size; u16 i; if (ice_ring_is_xdp(tx_ring) && tx_ring->xsk_pool) { ice_xsk_clean_xdp_ring(tx_ring); goto tx_skip_free; } /* ring already cleared, nothing to do */ if (!tx_ring->tx_buf) return; /* Free all the Tx ring sk_buffs */ for (i = 0; i < tx_ring->count; i++) ice_unmap_and_free_tx_buf(tx_ring, &tx_ring->tx_buf[i]); tx_skip_free: memset(tx_ring->tx_buf, 0, sizeof(*tx_ring->tx_buf) * tx_ring->count); size = ALIGN(tx_ring->count * sizeof(struct ice_tx_desc), PAGE_SIZE); /* Zero out the descriptor ring */ memset(tx_ring->desc, 0, size); tx_ring->next_to_use = 0; tx_ring->next_to_clean = 0; if (!tx_ring->netdev) return; /* cleanup Tx queue statistics */ netdev_tx_reset_queue(txring_txq(tx_ring)); } /** * ice_free_tx_ring - Free Tx resources per queue * @tx_ring: Tx descriptor ring for a specific queue * * Free all transmit software resources */ void ice_free_tx_ring(struct ice_tx_ring *tx_ring) { u32 size; ice_clean_tx_ring(tx_ring); devm_kfree(tx_ring->dev, tx_ring->tx_buf); tx_ring->tx_buf = NULL; if (tx_ring->desc) { size = ALIGN(tx_ring->count * sizeof(struct ice_tx_desc), PAGE_SIZE); dmam_free_coherent(tx_ring->dev, size, tx_ring->desc, tx_ring->dma); tx_ring->desc = NULL; } } /** * ice_clean_tx_irq - Reclaim resources after transmit completes * @tx_ring: Tx ring to clean * @napi_budget: Used to determine if we are in netpoll * * Returns true if there's any budget left (e.g. the clean is finished) */ static bool ice_clean_tx_irq(struct ice_tx_ring *tx_ring, int napi_budget) { unsigned int total_bytes = 0, total_pkts = 0; unsigned int budget = ICE_DFLT_IRQ_WORK; struct ice_vsi *vsi = tx_ring->vsi; s16 i = tx_ring->next_to_clean; struct ice_tx_desc *tx_desc; struct ice_tx_buf *tx_buf; /* get the bql data ready */ netdev_txq_bql_complete_prefetchw(txring_txq(tx_ring)); tx_buf = &tx_ring->tx_buf[i]; tx_desc = ICE_TX_DESC(tx_ring, i); i -= tx_ring->count; prefetch(&vsi->state); do { struct ice_tx_desc *eop_desc = tx_buf->next_to_watch; /* if next_to_watch is not set then there is no work pending */ if (!eop_desc) break; /* follow the guidelines of other drivers */ prefetchw(&tx_buf->skb->users); smp_rmb(); /* prevent any other reads prior to eop_desc */ ice_trace(clean_tx_irq, tx_ring, tx_desc, tx_buf); /* if the descriptor isn't done, no work yet to do */ if (!(eop_desc->cmd_type_offset_bsz & cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE))) break; /* clear next_to_watch to prevent false hangs */ tx_buf->next_to_watch = NULL; /* update the statistics for this packet */ total_bytes += tx_buf->bytecount; total_pkts += tx_buf->gso_segs; /* free the skb */ napi_consume_skb(tx_buf->skb, napi_budget); /* unmap skb header data */ dma_unmap_single(tx_ring->dev, dma_unmap_addr(tx_buf, dma), dma_unmap_len(tx_buf, len), DMA_TO_DEVICE); /* clear tx_buf data */ tx_buf->type = ICE_TX_BUF_EMPTY; dma_unmap_len_set(tx_buf, len, 0); /* unmap remaining buffers */ while (tx_desc != eop_desc) { ice_trace(clean_tx_irq_unmap, tx_ring, tx_desc, tx_buf); tx_buf++; tx_desc++; i++; if (unlikely(!i)) { i -= tx_ring->count; tx_buf = tx_ring->tx_buf; tx_desc = ICE_TX_DESC(tx_ring, 0); } /* unmap any remaining paged data */ if (dma_unmap_len(tx_buf, len)) { dma_unmap_page(tx_ring->dev, dma_unmap_addr(tx_buf, dma), dma_unmap_len(tx_buf, len), DMA_TO_DEVICE); dma_unmap_len_set(tx_buf, len, 0); } } ice_trace(clean_tx_irq_unmap_eop, tx_ring, tx_desc, tx_buf); /* move us one more past the eop_desc for start of next pkt */ tx_buf++; tx_desc++; i++; if (unlikely(!i)) { i -= tx_ring->count; tx_buf = tx_ring->tx_buf; tx_desc = ICE_TX_DESC(tx_ring, 0); } prefetch(tx_desc); /* update budget accounting */ budget--; } while (likely(budget)); i += tx_ring->count; tx_ring->next_to_clean = i; ice_update_tx_ring_stats(tx_ring, total_pkts, total_bytes); netdev_tx_completed_queue(txring_txq(tx_ring), total_pkts, total_bytes); #define TX_WAKE_THRESHOLD ((s16)(DESC_NEEDED * 2)) if (unlikely(total_pkts && netif_carrier_ok(tx_ring->netdev) && (ICE_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD))) { /* Make sure that anybody stopping the queue after this * sees the new next_to_clean. */ smp_mb(); if (netif_tx_queue_stopped(txring_txq(tx_ring)) && !test_bit(ICE_VSI_DOWN, vsi->state)) { netif_tx_wake_queue(txring_txq(tx_ring)); ++tx_ring->ring_stats->tx_stats.restart_q; } } return !!budget; } /** * ice_setup_tx_ring - Allocate the Tx descriptors * @tx_ring: the Tx ring to set up * * Return 0 on success, negative on error */ int ice_setup_tx_ring(struct ice_tx_ring *tx_ring) { struct device *dev = tx_ring->dev; u32 size; if (!dev) return -ENOMEM; /* warn if we are about to overwrite the pointer */ WARN_ON(tx_ring->tx_buf); tx_ring->tx_buf = devm_kcalloc(dev, sizeof(*tx_ring->tx_buf), tx_ring->count, GFP_KERNEL); if (!tx_ring->tx_buf) return -ENOMEM; /* round up to nearest page */ size = ALIGN(tx_ring->count * sizeof(struct ice_tx_desc), PAGE_SIZE); tx_ring->desc = dmam_alloc_coherent(dev, size, &tx_ring->dma, GFP_KERNEL); if (!tx_ring->desc) { dev_err(dev, "Unable to allocate memory for the Tx descriptor ring, size=%d\n", size); goto err; } tx_ring->next_to_use = 0; tx_ring->next_to_clean = 0; tx_ring->ring_stats->tx_stats.prev_pkt = -1; return 0; err: devm_kfree(dev, tx_ring->tx_buf); tx_ring->tx_buf = NULL; return -ENOMEM; } /** * ice_clean_rx_ring - Free Rx buffers * @rx_ring: ring to be cleaned */ void ice_clean_rx_ring(struct ice_rx_ring *rx_ring) { struct xdp_buff *xdp = &rx_ring->xdp; struct device *dev = rx_ring->dev; u32 size; u16 i; /* ring already cleared, nothing to do */ if (!rx_ring->rx_buf) return; if (rx_ring->xsk_pool) { ice_xsk_clean_rx_ring(rx_ring); goto rx_skip_free; } if (xdp->data) { xdp_return_buff(xdp); xdp->data = NULL; } /* Free all the Rx ring sk_buffs */ for (i = 0; i < rx_ring->count; i++) { struct ice_rx_buf *rx_buf = &rx_ring->rx_buf[i]; if (!rx_buf->page) continue; /* Invalidate cache lines that may have been written to by * device so that we avoid corrupting memory. */ dma_sync_single_range_for_cpu(dev, rx_buf->dma, rx_buf->page_offset, rx_ring->rx_buf_len, DMA_FROM_DEVICE); /* free resources associated with mapping */ dma_unmap_page_attrs(dev, rx_buf->dma, ice_rx_pg_size(rx_ring), DMA_FROM_DEVICE, ICE_RX_DMA_ATTR); __page_frag_cache_drain(rx_buf->page, rx_buf->pagecnt_bias); rx_buf->page = NULL; rx_buf->page_offset = 0; } rx_skip_free: if (rx_ring->xsk_pool) memset(rx_ring->xdp_buf, 0, array_size(rx_ring->count, sizeof(*rx_ring->xdp_buf))); else memset(rx_ring->rx_buf, 0, array_size(rx_ring->count, sizeof(*rx_ring->rx_buf))); /* Zero out the descriptor ring */ size = ALIGN(rx_ring->count * sizeof(union ice_32byte_rx_desc), PAGE_SIZE); memset(rx_ring->desc, 0, size); rx_ring->next_to_alloc = 0; rx_ring->next_to_clean = 0; rx_ring->first_desc = 0; rx_ring->next_to_use = 0; } /** * ice_free_rx_ring - Free Rx resources * @rx_ring: ring to clean the resources from * * Free all receive software resources */ void ice_free_rx_ring(struct ice_rx_ring *rx_ring) { u32 size; ice_clean_rx_ring(rx_ring); if (rx_ring->vsi->type == ICE_VSI_PF) if (xdp_rxq_info_is_reg(&rx_ring->xdp_rxq)) xdp_rxq_info_unreg(&rx_ring->xdp_rxq); WRITE_ONCE(rx_ring->xdp_prog, NULL); if (rx_ring->xsk_pool) { kfree(rx_ring->xdp_buf); rx_ring->xdp_buf = NULL; } else { kfree(rx_ring->rx_buf); rx_ring->rx_buf = NULL; } if (rx_ring->desc) { size = ALIGN(rx_ring->count * sizeof(union ice_32byte_rx_desc), PAGE_SIZE); dmam_free_coherent(rx_ring->dev, size, rx_ring->desc, rx_ring->dma); rx_ring->desc = NULL; } } /** * ice_setup_rx_ring - Allocate the Rx descriptors * @rx_ring: the Rx ring to set up * * Return 0 on success, negative on error */ int ice_setup_rx_ring(struct ice_rx_ring *rx_ring) { struct device *dev = rx_ring->dev; u32 size; if (!dev) return -ENOMEM; /* warn if we are about to overwrite the pointer */ WARN_ON(rx_ring->rx_buf); rx_ring->rx_buf = kcalloc(rx_ring->count, sizeof(*rx_ring->rx_buf), GFP_KERNEL); if (!rx_ring->rx_buf) return -ENOMEM; /* round up to nearest page */ size = ALIGN(rx_ring->count * sizeof(union ice_32byte_rx_desc), PAGE_SIZE); rx_ring->desc = dmam_alloc_coherent(dev, size, &rx_ring->dma, GFP_KERNEL); if (!rx_ring->desc) { dev_err(dev, "Unable to allocate memory for the Rx descriptor ring, size=%d\n", size); goto err; } rx_ring->next_to_use = 0; rx_ring->next_to_clean = 0; rx_ring->first_desc = 0; if (ice_is_xdp_ena_vsi(rx_ring->vsi)) WRITE_ONCE(rx_ring->xdp_prog, rx_ring->vsi->xdp_prog); return 0; err: kfree(rx_ring->rx_buf); rx_ring->rx_buf = NULL; return -ENOMEM; } /** * ice_run_xdp - Executes an XDP program on initialized xdp_buff * @rx_ring: Rx ring * @xdp: xdp_buff used as input to the XDP program * @xdp_prog: XDP program to run * @xdp_ring: ring to be used for XDP_TX action * @rx_buf: Rx buffer to store the XDP action * @eop_desc: Last descriptor in packet to read metadata from * * Returns any of ICE_XDP_{PASS, CONSUMED, TX, REDIR} */ static void ice_run_xdp(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp, struct bpf_prog *xdp_prog, struct ice_tx_ring *xdp_ring, struct ice_rx_buf *rx_buf, union ice_32b_rx_flex_desc *eop_desc) { unsigned int ret = ICE_XDP_PASS; u32 act; if (!xdp_prog) goto exit; ice_xdp_meta_set_desc(xdp, eop_desc); act = bpf_prog_run_xdp(xdp_prog, xdp); switch (act) { case XDP_PASS: break; case XDP_TX: if (static_branch_unlikely(&ice_xdp_locking_key)) spin_lock(&xdp_ring->tx_lock); ret = __ice_xmit_xdp_ring(xdp, xdp_ring, false); if (static_branch_unlikely(&ice_xdp_locking_key)) spin_unlock(&xdp_ring->tx_lock); if (ret == ICE_XDP_CONSUMED) goto out_failure; break; case XDP_REDIRECT: if (xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog)) goto out_failure; ret = ICE_XDP_REDIR; break; default: bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act); fallthrough; case XDP_ABORTED: out_failure: trace_xdp_exception(rx_ring->netdev, xdp_prog, act); fallthrough; case XDP_DROP: ret = ICE_XDP_CONSUMED; } exit: ice_set_rx_bufs_act(xdp, rx_ring, ret); } /** * ice_xmit_xdp_ring - submit frame to XDP ring for transmission * @xdpf: XDP frame that will be converted to XDP buff * @xdp_ring: XDP ring for transmission */ static int ice_xmit_xdp_ring(const struct xdp_frame *xdpf, struct ice_tx_ring *xdp_ring) { struct xdp_buff xdp; xdp.data_hard_start = (void *)xdpf; xdp.data = xdpf->data; xdp.data_end = xdp.data + xdpf->len; xdp.frame_sz = xdpf->frame_sz; xdp.flags = xdpf->flags; return __ice_xmit_xdp_ring(&xdp, xdp_ring, true); } /** * ice_xdp_xmit - submit packets to XDP ring for transmission * @dev: netdev * @n: number of XDP frames to be transmitted * @frames: XDP frames to be transmitted * @flags: transmit flags * * Returns number of frames successfully sent. Failed frames * will be free'ed by XDP core. * For error cases, a negative errno code is returned and no-frames * are transmitted (caller must handle freeing frames). */ int ice_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames, u32 flags) { struct ice_netdev_priv *np = netdev_priv(dev); unsigned int queue_index = smp_processor_id(); struct ice_vsi *vsi = np->vsi; struct ice_tx_ring *xdp_ring; struct ice_tx_buf *tx_buf; int nxmit = 0, i; if (test_bit(ICE_VSI_DOWN, vsi->state)) return -ENETDOWN; if (!ice_is_xdp_ena_vsi(vsi)) return -ENXIO; if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) return -EINVAL; if (static_branch_unlikely(&ice_xdp_locking_key)) { queue_index %= vsi->num_xdp_txq; xdp_ring = vsi->xdp_rings[queue_index]; spin_lock(&xdp_ring->tx_lock); } else { /* Generally, should not happen */ if (unlikely(queue_index >= vsi->num_xdp_txq)) return -ENXIO; xdp_ring = vsi->xdp_rings[queue_index]; } tx_buf = &xdp_ring->tx_buf[xdp_ring->next_to_use]; for (i = 0; i < n; i++) { const struct xdp_frame *xdpf = frames[i]; int err; err = ice_xmit_xdp_ring(xdpf, xdp_ring); if (err != ICE_XDP_TX) break; nxmit++; } tx_buf->rs_idx = ice_set_rs_bit(xdp_ring); if (unlikely(flags & XDP_XMIT_FLUSH)) ice_xdp_ring_update_tail(xdp_ring); if (static_branch_unlikely(&ice_xdp_locking_key)) spin_unlock(&xdp_ring->tx_lock); return nxmit; } /** * ice_alloc_mapped_page - recycle or make a new page * @rx_ring: ring to use * @bi: rx_buf struct to modify * * Returns true if the page was successfully allocated or * reused. */ static bool ice_alloc_mapped_page(struct ice_rx_ring *rx_ring, struct ice_rx_buf *bi) { struct page *page = bi->page; dma_addr_t dma; /* since we are recycling buffers we should seldom need to alloc */ if (likely(page)) return true; /* alloc new page for storage */ page = dev_alloc_pages(ice_rx_pg_order(rx_ring)); if (unlikely(!page)) { rx_ring->ring_stats->rx_stats.alloc_page_failed++; return false; } /* map page for use */ dma = dma_map_page_attrs(rx_ring->dev, page, 0, ice_rx_pg_size(rx_ring), DMA_FROM_DEVICE, ICE_RX_DMA_ATTR); /* if mapping failed free memory back to system since * there isn't much point in holding memory we can't use */ if (dma_mapping_error(rx_ring->dev, dma)) { __free_pages(page, ice_rx_pg_order(rx_ring)); rx_ring->ring_stats->rx_stats.alloc_page_failed++; return false; } bi->dma = dma; bi->page = page; bi->page_offset = rx_ring->rx_offset; page_ref_add(page, USHRT_MAX - 1); bi->pagecnt_bias = USHRT_MAX; return true; } /** * ice_alloc_rx_bufs - Replace used receive buffers * @rx_ring: ring to place buffers on * @cleaned_count: number of buffers to replace * * Returns false if all allocations were successful, true if any fail. Returning * true signals to the caller that we didn't replace cleaned_count buffers and * there is more work to do. * * First, try to clean "cleaned_count" Rx buffers. Then refill the cleaned Rx * buffers. Then bump tail at most one time. Grouping like this lets us avoid * multiple tail writes per call. */ bool ice_alloc_rx_bufs(struct ice_rx_ring *rx_ring, unsigned int cleaned_count) { union ice_32b_rx_flex_desc *rx_desc; u16 ntu = rx_ring->next_to_use; struct ice_rx_buf *bi; /* do nothing if no valid netdev defined */ if ((!rx_ring->netdev && rx_ring->vsi->type != ICE_VSI_CTRL) || !cleaned_count) return false; /* get the Rx descriptor and buffer based on next_to_use */ rx_desc = ICE_RX_DESC(rx_ring, ntu); bi = &rx_ring->rx_buf[ntu]; do { /* if we fail here, we have work remaining */ if (!ice_alloc_mapped_page(rx_ring, bi)) break; /* sync the buffer for use by the device */ dma_sync_single_range_for_device(rx_ring->dev, bi->dma, bi->page_offset, rx_ring->rx_buf_len, DMA_FROM_DEVICE); /* Refresh the desc even if buffer_addrs didn't change * because each write-back erases this info. */ rx_desc->read.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset); rx_desc++; bi++; ntu++; if (unlikely(ntu == rx_ring->count)) { rx_desc = ICE_RX_DESC(rx_ring, 0); bi = rx_ring->rx_buf; ntu = 0; } /* clear the status bits for the next_to_use descriptor */ rx_desc->wb.status_error0 = 0; cleaned_count--; } while (cleaned_count); if (rx_ring->next_to_use != ntu) ice_release_rx_desc(rx_ring, ntu); return !!cleaned_count; } /** * ice_rx_buf_adjust_pg_offset - Prepare Rx buffer for reuse * @rx_buf: Rx buffer to adjust * @size: Size of adjustment * * Update the offset within page so that Rx buf will be ready to be reused. * For systems with PAGE_SIZE < 8192 this function will flip the page offset * so the second half of page assigned to Rx buffer will be used, otherwise * the offset is moved by "size" bytes */ static void ice_rx_buf_adjust_pg_offset(struct ice_rx_buf *rx_buf, unsigned int size) { #if (PAGE_SIZE < 8192) /* flip page offset to other buffer */ rx_buf->page_offset ^= size; #else /* move offset up to the next cache line */ rx_buf->page_offset += size; #endif } /** * ice_can_reuse_rx_page - Determine if page can be reused for another Rx * @rx_buf: buffer containing the page * * If page is reusable, we have a green light for calling ice_reuse_rx_page, * which will assign the current buffer to the buffer that next_to_alloc is * pointing to; otherwise, the DMA mapping needs to be destroyed and * page freed */ static bool ice_can_reuse_rx_page(struct ice_rx_buf *rx_buf) { unsigned int pagecnt_bias = rx_buf->pagecnt_bias; struct page *page = rx_buf->page; /* avoid re-using remote and pfmemalloc pages */ if (!dev_page_is_reusable(page)) return false; /* if we are only owner of page we can reuse it */ if (unlikely(rx_buf->pgcnt - pagecnt_bias > 1)) return false; #if (PAGE_SIZE >= 8192) #define ICE_LAST_OFFSET \ (SKB_WITH_OVERHEAD(PAGE_SIZE) - ICE_RXBUF_3072) if (rx_buf->page_offset > ICE_LAST_OFFSET) return false; #endif /* PAGE_SIZE >= 8192) */ /* If we have drained the page fragment pool we need to update * the pagecnt_bias and page count so that we fully restock the * number of references the driver holds. */ if (unlikely(pagecnt_bias == 1)) { page_ref_add(page, USHRT_MAX - 1); rx_buf->pagecnt_bias = USHRT_MAX; } return true; } /** * ice_add_xdp_frag - Add contents of Rx buffer to xdp buf as a frag * @rx_ring: Rx descriptor ring to transact packets on * @xdp: xdp buff to place the data into * @rx_buf: buffer containing page to add * @size: packet length from rx_desc * * This function will add the data contained in rx_buf->page to the xdp buf. * It will just attach the page as a frag. */ static int ice_add_xdp_frag(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp, struct ice_rx_buf *rx_buf, const unsigned int size) { struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); if (!size) return 0; if (!xdp_buff_has_frags(xdp)) { sinfo->nr_frags = 0; sinfo->xdp_frags_size = 0; xdp_buff_set_frags_flag(xdp); } if (unlikely(sinfo->nr_frags == MAX_SKB_FRAGS)) { ice_set_rx_bufs_act(xdp, rx_ring, ICE_XDP_CONSUMED); return -ENOMEM; } __skb_fill_page_desc_noacc(sinfo, sinfo->nr_frags++, rx_buf->page, rx_buf->page_offset, size); sinfo->xdp_frags_size += size; /* remember frag count before XDP prog execution; bpf_xdp_adjust_tail() * can pop off frags but driver has to handle it on its own */ rx_ring->nr_frags = sinfo->nr_frags; if (page_is_pfmemalloc(rx_buf->page)) xdp_buff_set_frag_pfmemalloc(xdp); return 0; } /** * ice_reuse_rx_page - page flip buffer and store it back on the ring * @rx_ring: Rx descriptor ring to store buffers on * @old_buf: donor buffer to have page reused * * Synchronizes page for reuse by the adapter */ static void ice_reuse_rx_page(struct ice_rx_ring *rx_ring, struct ice_rx_buf *old_buf) { u16 nta = rx_ring->next_to_alloc; struct ice_rx_buf *new_buf; new_buf = &rx_ring->rx_buf[nta]; /* update, and store next to alloc */ nta++; rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0; /* Transfer page from old buffer to new buffer. * Move each member individually to avoid possible store * forwarding stalls and unnecessary copy of skb. */ new_buf->dma = old_buf->dma; new_buf->page = old_buf->page; new_buf->page_offset = old_buf->page_offset; new_buf->pagecnt_bias = old_buf->pagecnt_bias; } /** * ice_get_rx_buf - Fetch Rx buffer and synchronize data for use * @rx_ring: Rx descriptor ring to transact packets on * @size: size of buffer to add to skb * @ntc: index of next to clean element * * This function will pull an Rx buffer from the ring and synchronize it * for use by the CPU. */ static struct ice_rx_buf * ice_get_rx_buf(struct ice_rx_ring *rx_ring, const unsigned int size, const unsigned int ntc) { struct ice_rx_buf *rx_buf; rx_buf = &rx_ring->rx_buf[ntc]; rx_buf->pgcnt = page_count(rx_buf->page); prefetchw(rx_buf->page); if (!size) return rx_buf; /* we are reusing so sync this buffer for CPU use */ dma_sync_single_range_for_cpu(rx_ring->dev, rx_buf->dma, rx_buf->page_offset, size, DMA_FROM_DEVICE); /* We have pulled a buffer for use, so decrement pagecnt_bias */ rx_buf->pagecnt_bias--; return rx_buf; } /** * ice_build_skb - Build skb around an existing buffer * @rx_ring: Rx descriptor ring to transact packets on * @xdp: xdp_buff pointing to the data * * This function builds an skb around an existing XDP buffer, taking care * to set up the skb correctly and avoid any memcpy overhead. Driver has * already combined frags (if any) to skb_shared_info. */ static struct sk_buff * ice_build_skb(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp) { u8 metasize = xdp->data - xdp->data_meta; struct skb_shared_info *sinfo = NULL; unsigned int nr_frags; struct sk_buff *skb; if (unlikely(xdp_buff_has_frags(xdp))) { sinfo = xdp_get_shared_info_from_buff(xdp); nr_frags = sinfo->nr_frags; } /* Prefetch first cache line of first page. If xdp->data_meta * is unused, this points exactly as xdp->data, otherwise we * likely have a consumer accessing first few bytes of meta * data, and then actual data. */ net_prefetch(xdp->data_meta); /* build an skb around the page buffer */ skb = napi_build_skb(xdp->data_hard_start, xdp->frame_sz); if (unlikely(!skb)) return NULL; /* must to record Rx queue, otherwise OS features such as * symmetric queue won't work */ skb_record_rx_queue(skb, rx_ring->q_index); /* update pointers within the skb to store the data */ skb_reserve(skb, xdp->data - xdp->data_hard_start); __skb_put(skb, xdp->data_end - xdp->data); if (metasize) skb_metadata_set(skb, metasize); if (unlikely(xdp_buff_has_frags(xdp))) xdp_update_skb_shared_info(skb, nr_frags, sinfo->xdp_frags_size, nr_frags * xdp->frame_sz, xdp_buff_is_frag_pfmemalloc(xdp)); return skb; } /** * ice_construct_skb - Allocate skb and populate it * @rx_ring: Rx descriptor ring to transact packets on * @xdp: xdp_buff pointing to the data * * This function allocates an skb. It then populates it with the page * data from the current receive descriptor, taking care to set up the * skb correctly. */ static struct sk_buff * ice_construct_skb(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp) { unsigned int size = xdp->data_end - xdp->data; struct skb_shared_info *sinfo = NULL; struct ice_rx_buf *rx_buf; unsigned int nr_frags = 0; unsigned int headlen; struct sk_buff *skb; /* prefetch first cache line of first page */ net_prefetch(xdp->data); if (unlikely(xdp_buff_has_frags(xdp))) { sinfo = xdp_get_shared_info_from_buff(xdp); nr_frags = sinfo->nr_frags; } /* allocate a skb to store the frags */ skb = napi_alloc_skb(&rx_ring->q_vector->napi, ICE_RX_HDR_SIZE); if (unlikely(!skb)) return NULL; rx_buf = &rx_ring->rx_buf[rx_ring->first_desc]; skb_record_rx_queue(skb, rx_ring->q_index); /* Determine available headroom for copy */ headlen = size; if (headlen > ICE_RX_HDR_SIZE) headlen = eth_get_headlen(skb->dev, xdp->data, ICE_RX_HDR_SIZE); /* align pull length to size of long to optimize memcpy performance */ memcpy(__skb_put(skb, headlen), xdp->data, ALIGN(headlen, sizeof(long))); /* if we exhaust the linear part then add what is left as a frag */ size -= headlen; if (size) { /* besides adding here a partial frag, we are going to add * frags from xdp_buff, make sure there is enough space for * them */ if (unlikely(nr_frags >= MAX_SKB_FRAGS - 1)) { dev_kfree_skb(skb); return NULL; } skb_add_rx_frag(skb, 0, rx_buf->page, rx_buf->page_offset + headlen, size, xdp->frame_sz); } else { /* buffer is unused, change the act that should be taken later * on; data was copied onto skb's linear part so there's no * need for adjusting page offset and we can reuse this buffer * as-is */ rx_buf->act = ICE_SKB_CONSUMED; } if (unlikely(xdp_buff_has_frags(xdp))) { struct skb_shared_info *skinfo = skb_shinfo(skb); memcpy(&skinfo->frags[skinfo->nr_frags], &sinfo->frags[0], sizeof(skb_frag_t) * nr_frags); xdp_update_skb_shared_info(skb, skinfo->nr_frags + nr_frags, sinfo->xdp_frags_size, nr_frags * xdp->frame_sz, xdp_buff_is_frag_pfmemalloc(xdp)); } return skb; } /** * ice_put_rx_buf - Clean up used buffer and either recycle or free * @rx_ring: Rx descriptor ring to transact packets on * @rx_buf: Rx buffer to pull data from * * This function will clean up the contents of the rx_buf. It will either * recycle the buffer or unmap it and free the associated resources. */ static void ice_put_rx_buf(struct ice_rx_ring *rx_ring, struct ice_rx_buf *rx_buf) { if (!rx_buf) return; if (ice_can_reuse_rx_page(rx_buf)) { /* hand second half of page back to the ring */ ice_reuse_rx_page(rx_ring, rx_buf); } else { /* we are not reusing the buffer so unmap it */ dma_unmap_page_attrs(rx_ring->dev, rx_buf->dma, ice_rx_pg_size(rx_ring), DMA_FROM_DEVICE, ICE_RX_DMA_ATTR); __page_frag_cache_drain(rx_buf->page, rx_buf->pagecnt_bias); } /* clear contents of buffer_info */ rx_buf->page = NULL; } /** * ice_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf * @rx_ring: Rx descriptor ring to transact packets on * @budget: Total limit on number of packets to process * * This function provides a "bounce buffer" approach to Rx interrupt * processing. The advantage to this is that on systems that have * expensive overhead for IOMMU access this provides a means of avoiding * it by maintaining the mapping of the page to the system. * * Returns amount of work completed */ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget) { unsigned int total_rx_bytes = 0, total_rx_pkts = 0; unsigned int offset = rx_ring->rx_offset; struct xdp_buff *xdp = &rx_ring->xdp; u32 cached_ntc = rx_ring->first_desc; struct ice_tx_ring *xdp_ring = NULL; struct bpf_prog *xdp_prog = NULL; u32 ntc = rx_ring->next_to_clean; u32 cnt = rx_ring->count; u32 xdp_xmit = 0; u32 cached_ntu; bool failure; u32 first; xdp_prog = READ_ONCE(rx_ring->xdp_prog); if (xdp_prog) { xdp_ring = rx_ring->xdp_ring; cached_ntu = xdp_ring->next_to_use; } /* start the loop to process Rx packets bounded by 'budget' */ while (likely(total_rx_pkts < (unsigned int)budget)) { union ice_32b_rx_flex_desc *rx_desc; struct ice_rx_buf *rx_buf; struct sk_buff *skb; unsigned int size; u16 stat_err_bits; u16 vlan_tci; /* get the Rx desc from Rx ring based on 'next_to_clean' */ rx_desc = ICE_RX_DESC(rx_ring, ntc); /* status_error_len will always be zero for unused descriptors * because it's cleared in cleanup, and overlaps with hdr_addr * which is always zero because packet split isn't used, if the * hardware wrote DD then it will be non-zero */ stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_DD_S); if (!ice_test_staterr(rx_desc->wb.status_error0, stat_err_bits)) break; /* This memory barrier is needed to keep us from reading * any other fields out of the rx_desc until we know the * DD bit is set. */ dma_rmb(); ice_trace(clean_rx_irq, rx_ring, rx_desc); if (rx_desc->wb.rxdid == FDIR_DESC_RXDID || !rx_ring->netdev) { struct ice_vsi *ctrl_vsi = rx_ring->vsi; if (rx_desc->wb.rxdid == FDIR_DESC_RXDID && ctrl_vsi->vf) ice_vc_fdir_irq_handler(ctrl_vsi, rx_desc); if (++ntc == cnt) ntc = 0; rx_ring->first_desc = ntc; continue; } size = le16_to_cpu(rx_desc->wb.pkt_len) & ICE_RX_FLX_DESC_PKT_LEN_M; /* retrieve a buffer from the ring */ rx_buf = ice_get_rx_buf(rx_ring, size, ntc); if (!xdp->data) { void *hard_start; hard_start = page_address(rx_buf->page) + rx_buf->page_offset - offset; xdp_prepare_buff(xdp, hard_start, offset, size, !!offset); xdp_buff_clear_frags_flag(xdp); } else if (ice_add_xdp_frag(rx_ring, xdp, rx_buf, size)) { break; } if (++ntc == cnt) ntc = 0; /* skip if it is NOP desc */ if (ice_is_non_eop(rx_ring, rx_desc)) continue; ice_run_xdp(rx_ring, xdp, xdp_prog, xdp_ring, rx_buf, rx_desc); if (rx_buf->act == ICE_XDP_PASS) goto construct_skb; total_rx_bytes += xdp_get_buff_len(xdp); total_rx_pkts++; xdp->data = NULL; rx_ring->first_desc = ntc; rx_ring->nr_frags = 0; continue; construct_skb: if (likely(ice_ring_uses_build_skb(rx_ring))) skb = ice_build_skb(rx_ring, xdp); else skb = ice_construct_skb(rx_ring, xdp); /* exit if we failed to retrieve a buffer */ if (!skb) { rx_ring->ring_stats->rx_stats.alloc_page_failed++; rx_buf->act = ICE_XDP_CONSUMED; if (unlikely(xdp_buff_has_frags(xdp))) ice_set_rx_bufs_act(xdp, rx_ring, ICE_XDP_CONSUMED); xdp->data = NULL; rx_ring->first_desc = ntc; rx_ring->nr_frags = 0; break; } xdp->data = NULL; rx_ring->first_desc = ntc; rx_ring->nr_frags = 0; stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_RXE_S); if (unlikely(ice_test_staterr(rx_desc->wb.status_error0, stat_err_bits))) { dev_kfree_skb_any(skb); continue; } vlan_tci = ice_get_vlan_tci(rx_desc); /* pad the skb if needed, to make a valid ethernet frame */ if (eth_skb_pad(skb)) continue; /* probably a little skewed due to removing CRC */ total_rx_bytes += skb->len; /* populate checksum, VLAN, and protocol */ ice_process_skb_fields(rx_ring, rx_desc, skb); ice_trace(clean_rx_irq_indicate, rx_ring, rx_desc, skb); /* send completed skb up the stack */ ice_receive_skb(rx_ring, skb, vlan_tci); /* update budget accounting */ total_rx_pkts++; } first = rx_ring->first_desc; while (cached_ntc != first) { struct ice_rx_buf *buf = &rx_ring->rx_buf[cached_ntc]; if (buf->act & (ICE_XDP_TX | ICE_XDP_REDIR)) { ice_rx_buf_adjust_pg_offset(buf, xdp->frame_sz); xdp_xmit |= buf->act; } else if (buf->act & ICE_XDP_CONSUMED) { buf->pagecnt_bias++; } else if (buf->act == ICE_XDP_PASS) { ice_rx_buf_adjust_pg_offset(buf, xdp->frame_sz); } ice_put_rx_buf(rx_ring, buf); if (++cached_ntc >= cnt) cached_ntc = 0; } rx_ring->next_to_clean = ntc; /* return up to cleaned_count buffers to hardware */ failure = ice_alloc_rx_bufs(rx_ring, ICE_RX_DESC_UNUSED(rx_ring)); if (xdp_xmit) ice_finalize_xdp_rx(xdp_ring, xdp_xmit, cached_ntu); if (rx_ring->ring_stats) ice_update_rx_ring_stats(rx_ring, total_rx_pkts, total_rx_bytes); /* guarantee a trip back through this routine if there was a failure */ return failure ? budget : (int)total_rx_pkts; } static void __ice_update_sample(struct ice_q_vector *q_vector, struct ice_ring_container *rc, struct dim_sample *sample, bool is_tx) { u64 packets = 0, bytes = 0; if (is_tx) { struct ice_tx_ring *tx_ring; ice_for_each_tx_ring(tx_ring, *rc) { struct ice_ring_stats *ring_stats; ring_stats = tx_ring->ring_stats; if (!ring_stats) continue; packets += ring_stats->stats.pkts; bytes += ring_stats->stats.bytes; } } else { struct ice_rx_ring *rx_ring; ice_for_each_rx_ring(rx_ring, *rc) { struct ice_ring_stats *ring_stats; ring_stats = rx_ring->ring_stats; if (!ring_stats) continue; packets += ring_stats->stats.pkts; bytes += ring_stats->stats.bytes; } } dim_update_sample(q_vector->total_events, packets, bytes, sample); sample->comp_ctr = 0; /* if dim settings get stale, like when not updated for 1 * second or longer, force it to start again. This addresses the * frequent case of an idle queue being switched to by the * scheduler. The 1,000 here means 1,000 milliseconds. */ if (ktime_ms_delta(sample->time, rc->dim.start_sample.time) >= 1000) rc->dim.state = DIM_START_MEASURE; } /** * ice_net_dim - Update net DIM algorithm * @q_vector: the vector associated with the interrupt * * Create a DIM sample and notify net_dim() so that it can possibly decide * a new ITR value based on incoming packets, bytes, and interrupts. * * This function is a no-op if the ring is not configured to dynamic ITR. */ static void ice_net_dim(struct ice_q_vector *q_vector) { struct ice_ring_container *tx = &q_vector->tx; struct ice_ring_container *rx = &q_vector->rx; if (ITR_IS_DYNAMIC(tx)) { struct dim_sample dim_sample; __ice_update_sample(q_vector, tx, &dim_sample, true); net_dim(&tx->dim, &dim_sample); } if (ITR_IS_DYNAMIC(rx)) { struct dim_sample dim_sample; __ice_update_sample(q_vector, rx, &dim_sample, false); net_dim(&rx->dim, &dim_sample); } } /** * ice_buildreg_itr - build value for writing to the GLINT_DYN_CTL register * @itr_idx: interrupt throttling index * @itr: interrupt throttling value in usecs */ static u32 ice_buildreg_itr(u16 itr_idx, u16 itr) { /* The ITR value is reported in microseconds, and the register value is * recorded in 2 microsecond units. For this reason we only need to * shift by the GLINT_DYN_CTL_INTERVAL_S - ICE_ITR_GRAN_S to apply this * granularity as a shift instead of division. The mask makes sure the * ITR value is never odd so we don't accidentally write into the field * prior to the ITR field. */ itr &= ICE_ITR_MASK; return GLINT_DYN_CTL_INTENA_M | GLINT_DYN_CTL_CLEARPBA_M | (itr_idx << GLINT_DYN_CTL_ITR_INDX_S) | (itr << (GLINT_DYN_CTL_INTERVAL_S - ICE_ITR_GRAN_S)); } /** * ice_enable_interrupt - re-enable MSI-X interrupt * @q_vector: the vector associated with the interrupt to enable * * If the VSI is down, the interrupt will not be re-enabled. Also, * when enabling the interrupt always reset the wb_on_itr to false * and trigger a software interrupt to clean out internal state. */ static void ice_enable_interrupt(struct ice_q_vector *q_vector) { struct ice_vsi *vsi = q_vector->vsi; bool wb_en = q_vector->wb_on_itr; u32 itr_val; if (test_bit(ICE_DOWN, vsi->state)) return; /* trigger an ITR delayed software interrupt when exiting busy poll, to * make sure to catch any pending cleanups that might have been missed * due to interrupt state transition. If busy poll or poll isn't * enabled, then don't update ITR, and just enable the interrupt. */ if (!wb_en) { itr_val = ice_buildreg_itr(ICE_ITR_NONE, 0); } else { q_vector->wb_on_itr = false; /* do two things here with a single write. Set up the third ITR * index to be used for software interrupt moderation, and then * trigger a software interrupt with a rate limit of 20K on * software interrupts, this will help avoid high interrupt * loads due to frequently polling and exiting polling. */ itr_val = ice_buildreg_itr(ICE_IDX_ITR2, ICE_ITR_20K); itr_val |= GLINT_DYN_CTL_SWINT_TRIG_M | ICE_IDX_ITR2 << GLINT_DYN_CTL_SW_ITR_INDX_S | GLINT_DYN_CTL_SW_ITR_INDX_ENA_M; } wr32(&vsi->back->hw, GLINT_DYN_CTL(q_vector->reg_idx), itr_val); } /** * ice_set_wb_on_itr - set WB_ON_ITR for this q_vector * @q_vector: q_vector to set WB_ON_ITR on * * We need to tell hardware to write-back completed descriptors even when * interrupts are disabled. Descriptors will be written back on cache line * boundaries without WB_ON_ITR enabled, but if we don't enable WB_ON_ITR * descriptors may not be written back if they don't fill a cache line until * the next interrupt. * * This sets the write-back frequency to whatever was set previously for the * ITR indices. Also, set the INTENA_MSK bit to make sure hardware knows we * aren't meddling with the INTENA_M bit. */ static void ice_set_wb_on_itr(struct ice_q_vector *q_vector) { struct ice_vsi *vsi = q_vector->vsi; /* already in wb_on_itr mode no need to change it */ if (q_vector->wb_on_itr) return; /* use previously set ITR values for all of the ITR indices by * specifying ICE_ITR_NONE, which will vary in adaptive (AIM) mode and * be static in non-adaptive mode (user configured) */ wr32(&vsi->back->hw, GLINT_DYN_CTL(q_vector->reg_idx), FIELD_PREP(GLINT_DYN_CTL_ITR_INDX_M, ICE_ITR_NONE) | FIELD_PREP(GLINT_DYN_CTL_INTENA_MSK_M, 1) | FIELD_PREP(GLINT_DYN_CTL_WB_ON_ITR_M, 1)); q_vector->wb_on_itr = true; } /** * ice_napi_poll - NAPI polling Rx/Tx cleanup routine * @napi: napi struct with our devices info in it * @budget: amount of work driver is allowed to do this pass, in packets * * This function will clean all queues associated with a q_vector. * * Returns the amount of work done */ int ice_napi_poll(struct napi_struct *napi, int budget) { struct ice_q_vector *q_vector = container_of(napi, struct ice_q_vector, napi); struct ice_tx_ring *tx_ring; struct ice_rx_ring *rx_ring; bool clean_complete = true; int budget_per_ring; int work_done = 0; /* Since the actual Tx work is minimal, we can give the Tx a larger * budget and be more aggressive about cleaning up the Tx descriptors. */ ice_for_each_tx_ring(tx_ring, q_vector->tx) { struct xsk_buff_pool *xsk_pool = READ_ONCE(tx_ring->xsk_pool); bool wd; if (xsk_pool) wd = ice_xmit_zc(tx_ring, xsk_pool); else if (ice_ring_is_xdp(tx_ring)) wd = true; else wd = ice_clean_tx_irq(tx_ring, budget); if (!wd) clean_complete = false; } /* Handle case where we are called by netpoll with a budget of 0 */ if (unlikely(budget <= 0)) return budget; /* normally we have 1 Rx ring per q_vector */ if (unlikely(q_vector->num_ring_rx > 1)) /* We attempt to distribute budget to each Rx queue fairly, but * don't allow the budget to go below 1 because that would exit * polling early. */ budget_per_ring = max_t(int, budget / q_vector->num_ring_rx, 1); else /* Max of 1 Rx ring in this q_vector so give it the budget */ budget_per_ring = budget; ice_for_each_rx_ring(rx_ring, q_vector->rx) { struct xsk_buff_pool *xsk_pool = READ_ONCE(rx_ring->xsk_pool); int cleaned; /* A dedicated path for zero-copy allows making a single * comparison in the irq context instead of many inside the * ice_clean_rx_irq function and makes the codebase cleaner. */ cleaned = rx_ring->xsk_pool ? ice_clean_rx_irq_zc(rx_ring, xsk_pool, budget_per_ring) : ice_clean_rx_irq(rx_ring, budget_per_ring); work_done += cleaned; /* if we clean as many as budgeted, we must not be done */ if (cleaned >= budget_per_ring) clean_complete = false; } /* If work not completed, return budget and polling will return */ if (!clean_complete) { /* Set the writeback on ITR so partial completions of * cache-lines will still continue even if we're polling. */ ice_set_wb_on_itr(q_vector); return budget; } /* Exit the polling mode, but don't re-enable interrupts if stack might * poll us due to busy-polling */ if (napi_complete_done(napi, work_done)) { ice_net_dim(q_vector); ice_enable_interrupt(q_vector); } else { ice_set_wb_on_itr(q_vector); } return min_t(int, work_done, budget - 1); } /** * __ice_maybe_stop_tx - 2nd level check for Tx stop conditions * @tx_ring: the ring to be checked * @size: the size buffer we want to assure is available * * Returns -EBUSY if a stop is needed, else 0 */ static int __ice_maybe_stop_tx(struct ice_tx_ring *tx_ring, unsigned int size) { netif_tx_stop_queue(txring_txq(tx_ring)); /* Memory barrier before checking head and tail */ smp_mb(); /* Check again in a case another CPU has just made room available. */ if (likely(ICE_DESC_UNUSED(tx_ring) < size)) return -EBUSY; /* A reprieve! - use start_queue because it doesn't call schedule */ netif_tx_start_queue(txring_txq(tx_ring)); ++tx_ring->ring_stats->tx_stats.restart_q; return 0; } /** * ice_maybe_stop_tx - 1st level check for Tx stop conditions * @tx_ring: the ring to be checked * @size: the size buffer we want to assure is available * * Returns 0 if stop is not needed */ static int ice_maybe_stop_tx(struct ice_tx_ring *tx_ring, unsigned int size) { if (likely(ICE_DESC_UNUSED(tx_ring) >= size)) return 0; return __ice_maybe_stop_tx(tx_ring, size); } /** * ice_tx_map - Build the Tx descriptor * @tx_ring: ring to send buffer on * @first: first buffer info buffer to use * @off: pointer to struct that holds offload parameters * * This function loops over the skb data pointed to by *first * and gets a physical address for each memory location and programs * it and the length into the transmit descriptor. */ static void ice_tx_map(struct ice_tx_ring *tx_ring, struct ice_tx_buf *first, struct ice_tx_offload_params *off) { u64 td_offset, td_tag, td_cmd; u16 i = tx_ring->next_to_use; unsigned int data_len, size; struct ice_tx_desc *tx_desc; struct ice_tx_buf *tx_buf; struct sk_buff *skb; skb_frag_t *frag; dma_addr_t dma; bool kick; td_tag = off->td_l2tag1; td_cmd = off->td_cmd; td_offset = off->td_offset; skb = first->skb; data_len = skb->data_len; size = skb_headlen(skb); tx_desc = ICE_TX_DESC(tx_ring, i); if (first->tx_flags & ICE_TX_FLAGS_HW_VLAN) { td_cmd |= (u64)ICE_TX_DESC_CMD_IL2TAG1; td_tag = first->vid; } dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE); tx_buf = first; for (frag = &skb_shinfo(skb)->frags[0];; frag++) { unsigned int max_data = ICE_MAX_DATA_PER_TXD_ALIGNED; if (dma_mapping_error(tx_ring->dev, dma)) goto dma_error; /* record length, and DMA address */ dma_unmap_len_set(tx_buf, len, size); dma_unmap_addr_set(tx_buf, dma, dma); /* align size to end of page */ max_data += -dma & (ICE_MAX_READ_REQ_SIZE - 1); tx_desc->buf_addr = cpu_to_le64(dma); /* account for data chunks larger than the hardware * can handle */ while (unlikely(size > ICE_MAX_DATA_PER_TXD)) { tx_desc->cmd_type_offset_bsz = ice_build_ctob(td_cmd, td_offset, max_data, td_tag); tx_desc++; i++; if (i == tx_ring->count) { tx_desc = ICE_TX_DESC(tx_ring, 0); i = 0; } dma += max_data; size -= max_data; max_data = ICE_MAX_DATA_PER_TXD_ALIGNED; tx_desc->buf_addr = cpu_to_le64(dma); } if (likely(!data_len)) break; tx_desc->cmd_type_offset_bsz = ice_build_ctob(td_cmd, td_offset, size, td_tag); tx_desc++; i++; if (i == tx_ring->count) { tx_desc = ICE_TX_DESC(tx_ring, 0); i = 0; } size = skb_frag_size(frag); data_len -= size; dma = skb_frag_dma_map(tx_ring->dev, frag, 0, size, DMA_TO_DEVICE); tx_buf = &tx_ring->tx_buf[i]; tx_buf->type = ICE_TX_BUF_FRAG; } /* record SW timestamp if HW timestamp is not available */ skb_tx_timestamp(first->skb); i++; if (i == tx_ring->count) i = 0; /* write last descriptor with RS and EOP bits */ td_cmd |= (u64)ICE_TXD_LAST_DESC_CMD; tx_desc->cmd_type_offset_bsz = ice_build_ctob(td_cmd, td_offset, size, td_tag); /* Force memory writes to complete before letting h/w know there * are new descriptors to fetch. * * We also use this memory barrier to make certain all of the * status bits have been updated before next_to_watch is written. */ wmb(); /* set next_to_watch value indicating a packet is present */ first->next_to_watch = tx_desc; tx_ring->next_to_use = i; ice_maybe_stop_tx(tx_ring, DESC_NEEDED); /* notify HW of packet */ kick = __netdev_tx_sent_queue(txring_txq(tx_ring), first->bytecount, netdev_xmit_more()); if (kick) /* notify HW of packet */ writel(i, tx_ring->tail); return; dma_error: /* clear DMA mappings for failed tx_buf map */ for (;;) { tx_buf = &tx_ring->tx_buf[i]; ice_unmap_and_free_tx_buf(tx_ring, tx_buf); if (tx_buf == first) break; if (i == 0) i = tx_ring->count; i--; } tx_ring->next_to_use = i; } /** * ice_tx_csum - Enable Tx checksum offloads * @first: pointer to the first descriptor * @off: pointer to struct that holds offload parameters * * Returns 0 or error (negative) if checksum offload can't happen, 1 otherwise. */ static int ice_tx_csum(struct ice_tx_buf *first, struct ice_tx_offload_params *off) { u32 l4_len = 0, l3_len = 0, l2_len = 0; struct sk_buff *skb = first->skb; union { struct iphdr *v4; struct ipv6hdr *v6; unsigned char *hdr; } ip; union { struct tcphdr *tcp; unsigned char *hdr; } l4; __be16 frag_off, protocol; unsigned char *exthdr; u32 offset, cmd = 0; u8 l4_proto = 0; if (skb->ip_summed != CHECKSUM_PARTIAL) return 0; protocol = vlan_get_protocol(skb); if (eth_p_mpls(protocol)) { ip.hdr = skb_inner_network_header(skb); l4.hdr = skb_checksum_start(skb); } else { ip.hdr = skb_network_header(skb); l4.hdr = skb_transport_header(skb); } /* compute outer L2 header size */ l2_len = ip.hdr - skb->data; offset = (l2_len / 2) << ICE_TX_DESC_LEN_MACLEN_S; /* set the tx_flags to indicate the IP protocol type. this is * required so that checksum header computation below is accurate. */ if (ip.v4->version == 4) first->tx_flags |= ICE_TX_FLAGS_IPV4; else if (ip.v6->version == 6) first->tx_flags |= ICE_TX_FLAGS_IPV6; if (skb->encapsulation) { bool gso_ena = false; u32 tunnel = 0; /* define outer network header type */ if (first->tx_flags & ICE_TX_FLAGS_IPV4) { tunnel |= (first->tx_flags & ICE_TX_FLAGS_TSO) ? ICE_TX_CTX_EIPT_IPV4 : ICE_TX_CTX_EIPT_IPV4_NO_CSUM; l4_proto = ip.v4->protocol; } else if (first->tx_flags & ICE_TX_FLAGS_IPV6) { int ret; tunnel |= ICE_TX_CTX_EIPT_IPV6; exthdr = ip.hdr + sizeof(*ip.v6); l4_proto = ip.v6->nexthdr; ret = ipv6_skip_exthdr(skb, exthdr - skb->data, &l4_proto, &frag_off); if (ret < 0) return -1; } /* define outer transport */ switch (l4_proto) { case IPPROTO_UDP: tunnel |= ICE_TXD_CTX_UDP_TUNNELING; first->tx_flags |= ICE_TX_FLAGS_TUNNEL; break; case IPPROTO_GRE: tunnel |= ICE_TXD_CTX_GRE_TUNNELING; first->tx_flags |= ICE_TX_FLAGS_TUNNEL; break; case IPPROTO_IPIP: case IPPROTO_IPV6: first->tx_flags |= ICE_TX_FLAGS_TUNNEL; l4.hdr = skb_inner_network_header(skb); break; default: if (first->tx_flags & ICE_TX_FLAGS_TSO) return -1; skb_checksum_help(skb); return 0; } /* compute outer L3 header size */ tunnel |= ((l4.hdr - ip.hdr) / 4) << ICE_TXD_CTX_QW0_EIPLEN_S; /* switch IP header pointer from outer to inner header */ ip.hdr = skb_inner_network_header(skb); /* compute tunnel header size */ tunnel |= ((ip.hdr - l4.hdr) / 2) << ICE_TXD_CTX_QW0_NATLEN_S; gso_ena = skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL; /* indicate if we need to offload outer UDP header */ if ((first->tx_flags & ICE_TX_FLAGS_TSO) && !gso_ena && (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) tunnel |= ICE_TXD_CTX_QW0_L4T_CS_M; /* record tunnel offload values */ off->cd_tunnel_params |= tunnel; /* set DTYP=1 to indicate that it's an Tx context descriptor * in IPsec tunnel mode with Tx offloads in Quad word 1 */ off->cd_qw1 |= (u64)ICE_TX_DESC_DTYPE_CTX; /* switch L4 header pointer from outer to inner */ l4.hdr = skb_inner_transport_header(skb); l4_proto = 0; /* reset type as we transition from outer to inner headers */ first->tx_flags &= ~(ICE_TX_FLAGS_IPV4 | ICE_TX_FLAGS_IPV6); if (ip.v4->version == 4) first->tx_flags |= ICE_TX_FLAGS_IPV4; if (ip.v6->version == 6) first->tx_flags |= ICE_TX_FLAGS_IPV6; } /* Enable IP checksum offloads */ if (first->tx_flags & ICE_TX_FLAGS_IPV4) { l4_proto = ip.v4->protocol; /* the stack computes the IP header already, the only time we * need the hardware to recompute it is in the case of TSO. */ if (first->tx_flags & ICE_TX_FLAGS_TSO) cmd |= ICE_TX_DESC_CMD_IIPT_IPV4_CSUM; else cmd |= ICE_TX_DESC_CMD_IIPT_IPV4; } else if (first->tx_flags & ICE_TX_FLAGS_IPV6) { cmd |= ICE_TX_DESC_CMD_IIPT_IPV6; exthdr = ip.hdr + sizeof(*ip.v6); l4_proto = ip.v6->nexthdr; if (l4.hdr != exthdr) ipv6_skip_exthdr(skb, exthdr - skb->data, &l4_proto, &frag_off); } else { return -1; } /* compute inner L3 header size */ l3_len = l4.hdr - ip.hdr; offset |= (l3_len / 4) << ICE_TX_DESC_LEN_IPLEN_S; /* Enable L4 checksum offloads */ switch (l4_proto) { case IPPROTO_TCP: /* enable checksum offloads */ cmd |= ICE_TX_DESC_CMD_L4T_EOFT_TCP; l4_len = l4.tcp->doff; offset |= l4_len << ICE_TX_DESC_LEN_L4_LEN_S; break; case IPPROTO_UDP: /* enable UDP checksum offload */ cmd |= ICE_TX_DESC_CMD_L4T_EOFT_UDP; l4_len = (sizeof(struct udphdr) >> 2); offset |= l4_len << ICE_TX_DESC_LEN_L4_LEN_S; break; case IPPROTO_SCTP: /* enable SCTP checksum offload */ cmd |= ICE_TX_DESC_CMD_L4T_EOFT_SCTP; l4_len = sizeof(struct sctphdr) >> 2; offset |= l4_len << ICE_TX_DESC_LEN_L4_LEN_S; break; default: if (first->tx_flags & ICE_TX_FLAGS_TSO) return -1; skb_checksum_help(skb); return 0; } off->td_cmd |= cmd; off->td_offset |= offset; return 1; } /** * ice_tx_prepare_vlan_flags - prepare generic Tx VLAN tagging flags for HW * @tx_ring: ring to send buffer on * @first: pointer to struct ice_tx_buf * * Checks the skb and set up correspondingly several generic transmit flags * related to VLAN tagging for the HW, such as VLAN, DCB, etc. */ static void ice_tx_prepare_vlan_flags(struct ice_tx_ring *tx_ring, struct ice_tx_buf *first) { struct sk_buff *skb = first->skb; /* nothing left to do, software offloaded VLAN */ if (!skb_vlan_tag_present(skb) && eth_type_vlan(skb->protocol)) return; /* the VLAN ethertype/tpid is determined by VSI configuration and netdev * feature flags, which the driver only allows either 802.1Q or 802.1ad * VLAN offloads exclusively so we only care about the VLAN ID here */ if (skb_vlan_tag_present(skb)) { first->vid = skb_vlan_tag_get(skb); if (tx_ring->flags & ICE_TX_FLAGS_RING_VLAN_L2TAG2) first->tx_flags |= ICE_TX_FLAGS_HW_OUTER_SINGLE_VLAN; else first->tx_flags |= ICE_TX_FLAGS_HW_VLAN; } ice_tx_prepare_vlan_flags_dcb(tx_ring, first); } /** * ice_tso - computes mss and TSO length to prepare for TSO * @first: pointer to struct ice_tx_buf * @off: pointer to struct that holds offload parameters * * Returns 0 or error (negative) if TSO can't happen, 1 otherwise. */ static int ice_tso(struct ice_tx_buf *first, struct ice_tx_offload_params *off) { struct sk_buff *skb = first->skb; union { struct iphdr *v4; struct ipv6hdr *v6; unsigned char *hdr; } ip; union { struct tcphdr *tcp; struct udphdr *udp; unsigned char *hdr; } l4; u64 cd_mss, cd_tso_len; __be16 protocol; u32 paylen; u8 l4_start; int err; if (skb->ip_summed != CHECKSUM_PARTIAL) return 0; if (!skb_is_gso(skb)) return 0; err = skb_cow_head(skb, 0); if (err < 0) return err; protocol = vlan_get_protocol(skb); if (eth_p_mpls(protocol)) ip.hdr = skb_inner_network_header(skb); else ip.hdr = skb_network_header(skb); l4.hdr = skb_checksum_start(skb); /* initialize outer IP header fields */ if (ip.v4->version == 4) { ip.v4->tot_len = 0; ip.v4->check = 0; } else { ip.v6->payload_len = 0; } if (skb_shinfo(skb)->gso_type & (SKB_GSO_GRE | SKB_GSO_GRE_CSUM | SKB_GSO_IPXIP4 | SKB_GSO_IPXIP6 | SKB_GSO_UDP_TUNNEL | SKB_GSO_UDP_TUNNEL_CSUM)) { if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) && (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) { l4.udp->len = 0; /* determine offset of outer transport header */ l4_start = (u8)(l4.hdr - skb->data); /* remove payload length from outer checksum */ paylen = skb->len - l4_start; csum_replace_by_diff(&l4.udp->check, (__force __wsum)htonl(paylen)); } /* reset pointers to inner headers */ ip.hdr = skb_inner_network_header(skb); l4.hdr = skb_inner_transport_header(skb); /* initialize inner IP header fields */ if (ip.v4->version == 4) { ip.v4->tot_len = 0; ip.v4->check = 0; } else { ip.v6->payload_len = 0; } } /* determine offset of transport header */ l4_start = (u8)(l4.hdr - skb->data); /* remove payload length from checksum */ paylen = skb->len - l4_start; if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) { csum_replace_by_diff(&l4.udp->check, (__force __wsum)htonl(paylen)); /* compute length of UDP segmentation header */ off->header_len = (u8)sizeof(l4.udp) + l4_start; } else { csum_replace_by_diff(&l4.tcp->check, (__force __wsum)htonl(paylen)); /* compute length of TCP segmentation header */ off->header_len = (u8)((l4.tcp->doff * 4) + l4_start); } /* update gso_segs and bytecount */ first->gso_segs = skb_shinfo(skb)->gso_segs; first->bytecount += (first->gso_segs - 1) * off->header_len; cd_tso_len = skb->len - off->header_len; cd_mss = skb_shinfo(skb)->gso_size; /* record cdesc_qw1 with TSO parameters */ off->cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX | (ICE_TX_CTX_DESC_TSO << ICE_TXD_CTX_QW1_CMD_S) | (cd_tso_len << ICE_TXD_CTX_QW1_TSO_LEN_S) | (cd_mss << ICE_TXD_CTX_QW1_MSS_S)); first->tx_flags |= ICE_TX_FLAGS_TSO; return 1; } /** * ice_txd_use_count - estimate the number of descriptors needed for Tx * @size: transmit request size in bytes * * Due to hardware alignment restrictions (4K alignment), we need to * assume that we can have no more than 12K of data per descriptor, even * though each descriptor can take up to 16K - 1 bytes of aligned memory. * Thus, we need to divide by 12K. But division is slow! Instead, * we decompose the operation into shifts and one relatively cheap * multiply operation. * * To divide by 12K, we first divide by 4K, then divide by 3: * To divide by 4K, shift right by 12 bits * To divide by 3, multiply by 85, then divide by 256 * (Divide by 256 is done by shifting right by 8 bits) * Finally, we add one to round up. Because 256 isn't an exact multiple of * 3, we'll underestimate near each multiple of 12K. This is actually more * accurate as we have 4K - 1 of wiggle room that we can fit into the last * segment. For our purposes this is accurate out to 1M which is orders of * magnitude greater than our largest possible GSO size. * * This would then be implemented as: * return (((size >> 12) * 85) >> 8) + ICE_DESCS_FOR_SKB_DATA_PTR; * * Since multiplication and division are commutative, we can reorder * operations into: * return ((size * 85) >> 20) + ICE_DESCS_FOR_SKB_DATA_PTR; */ static unsigned int ice_txd_use_count(unsigned int size) { return ((size * 85) >> 20) + ICE_DESCS_FOR_SKB_DATA_PTR; } /** * ice_xmit_desc_count - calculate number of Tx descriptors needed * @skb: send buffer * * Returns number of data descriptors needed for this skb. */ static unsigned int ice_xmit_desc_count(struct sk_buff *skb) { const skb_frag_t *frag = &skb_shinfo(skb)->frags[0]; unsigned int nr_frags = skb_shinfo(skb)->nr_frags; unsigned int count = 0, size = skb_headlen(skb); for (;;) { count += ice_txd_use_count(size); if (!nr_frags--) break; size = skb_frag_size(frag++); } return count; } /** * __ice_chk_linearize - Check if there are more than 8 buffers per packet * @skb: send buffer * * Note: This HW can't DMA more than 8 buffers to build a packet on the wire * and so we need to figure out the cases where we need to linearize the skb. * * For TSO we need to count the TSO header and segment payload separately. * As such we need to check cases where we have 7 fragments or more as we * can potentially require 9 DMA transactions, 1 for the TSO header, 1 for * the segment payload in the first descriptor, and another 7 for the * fragments. */ static bool __ice_chk_linearize(struct sk_buff *skb) { const skb_frag_t *frag, *stale; int nr_frags, sum; /* no need to check if number of frags is less than 7 */ nr_frags = skb_shinfo(skb)->nr_frags; if (nr_frags < (ICE_MAX_BUF_TXD - 1)) return false; /* We need to walk through the list and validate that each group * of 6 fragments totals at least gso_size. */ nr_frags -= ICE_MAX_BUF_TXD - 2; frag = &skb_shinfo(skb)->frags[0]; /* Initialize size to the negative value of gso_size minus 1. We * use this as the worst case scenario in which the frag ahead * of us only provides one byte which is why we are limited to 6 * descriptors for a single transmit as the header and previous * fragment are already consuming 2 descriptors. */ sum = 1 - skb_shinfo(skb)->gso_size; /* Add size of frags 0 through 4 to create our initial sum */ sum += skb_frag_size(frag++); sum += skb_frag_size(frag++); sum += skb_frag_size(frag++); sum += skb_frag_size(frag++); sum += skb_frag_size(frag++); /* Walk through fragments adding latest fragment, testing it, and * then removing stale fragments from the sum. */ for (stale = &skb_shinfo(skb)->frags[0];; stale++) { int stale_size = skb_frag_size(stale); sum += skb_frag_size(frag++); /* The stale fragment may present us with a smaller * descriptor than the actual fragment size. To account * for that we need to remove all the data on the front and * figure out what the remainder would be in the last * descriptor associated with the fragment. */ if (stale_size > ICE_MAX_DATA_PER_TXD) { int align_pad = -(skb_frag_off(stale)) & (ICE_MAX_READ_REQ_SIZE - 1); sum -= align_pad; stale_size -= align_pad; do { sum -= ICE_MAX_DATA_PER_TXD_ALIGNED; stale_size -= ICE_MAX_DATA_PER_TXD_ALIGNED; } while (stale_size > ICE_MAX_DATA_PER_TXD); } /* if sum is negative we failed to make sufficient progress */ if (sum < 0) return true; if (!nr_frags--) break; sum -= stale_size; } return false; } /** * ice_chk_linearize - Check if there are more than 8 fragments per packet * @skb: send buffer * @count: number of buffers used * * Note: Our HW can't scatter-gather more than 8 fragments to build * a packet on the wire and so we need to figure out the cases where we * need to linearize the skb. */ static bool ice_chk_linearize(struct sk_buff *skb, unsigned int count) { /* Both TSO and single send will work if count is less than 8 */ if (likely(count < ICE_MAX_BUF_TXD)) return false; if (skb_is_gso(skb)) return __ice_chk_linearize(skb); /* we can support up to 8 data buffers for a single send */ return count != ICE_MAX_BUF_TXD; } /** * ice_tstamp - set up context descriptor for hardware timestamp * @tx_ring: pointer to the Tx ring to send buffer on * @skb: pointer to the SKB we're sending * @first: Tx buffer * @off: Tx offload parameters */ static void ice_tstamp(struct ice_tx_ring *tx_ring, struct sk_buff *skb, struct ice_tx_buf *first, struct ice_tx_offload_params *off) { s8 idx; /* only timestamp the outbound packet if the user has requested it */ if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))) return; /* Tx timestamps cannot be sampled when doing TSO */ if (first->tx_flags & ICE_TX_FLAGS_TSO) return; /* Grab an open timestamp slot */ idx = ice_ptp_request_ts(tx_ring->tx_tstamps, skb); if (idx < 0) { tx_ring->vsi->back->ptp.tx_hwtstamp_skipped++; return; } off->cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX | (ICE_TX_CTX_DESC_TSYN << ICE_TXD_CTX_QW1_CMD_S) | ((u64)idx << ICE_TXD_CTX_QW1_TSO_LEN_S)); first->tx_flags |= ICE_TX_FLAGS_TSYN; } /** * ice_xmit_frame_ring - Sends buffer on Tx ring * @skb: send buffer * @tx_ring: ring to send buffer on * * Returns NETDEV_TX_OK if sent, else an error code */ static netdev_tx_t ice_xmit_frame_ring(struct sk_buff *skb, struct ice_tx_ring *tx_ring) { struct ice_tx_offload_params offload = { 0 }; struct ice_vsi *vsi = tx_ring->vsi; struct ice_tx_buf *first; struct ethhdr *eth; unsigned int count; int tso, csum; ice_trace(xmit_frame_ring, tx_ring, skb); if (unlikely(ipv6_hopopt_jumbo_remove(skb))) goto out_drop; count = ice_xmit_desc_count(skb); if (ice_chk_linearize(skb, count)) { if (__skb_linearize(skb)) goto out_drop; count = ice_txd_use_count(skb->len); tx_ring->ring_stats->tx_stats.tx_linearize++; } /* need: 1 descriptor per page * PAGE_SIZE/ICE_MAX_DATA_PER_TXD, * + 1 desc for skb_head_len/ICE_MAX_DATA_PER_TXD, * + 4 desc gap to avoid the cache line where head is, * + 1 desc for context descriptor, * otherwise try next time */ if (ice_maybe_stop_tx(tx_ring, count + ICE_DESCS_PER_CACHE_LINE + ICE_DESCS_FOR_CTX_DESC)) { tx_ring->ring_stats->tx_stats.tx_busy++; return NETDEV_TX_BUSY; } /* prefetch for bql data which is infrequently used */ netdev_txq_bql_enqueue_prefetchw(txring_txq(tx_ring)); offload.tx_ring = tx_ring; /* record the location of the first descriptor for this packet */ first = &tx_ring->tx_buf[tx_ring->next_to_use]; first->skb = skb; first->type = ICE_TX_BUF_SKB; first->bytecount = max_t(unsigned int, skb->len, ETH_ZLEN); first->gso_segs = 1; first->tx_flags = 0; /* prepare the VLAN tagging flags for Tx */ ice_tx_prepare_vlan_flags(tx_ring, first); if (first->tx_flags & ICE_TX_FLAGS_HW_OUTER_SINGLE_VLAN) { offload.cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX | (ICE_TX_CTX_DESC_IL2TAG2 << ICE_TXD_CTX_QW1_CMD_S)); offload.cd_l2tag2 = first->vid; } /* set up TSO offload */ tso = ice_tso(first, &offload); if (tso < 0) goto out_drop; /* always set up Tx checksum offload */ csum = ice_tx_csum(first, &offload); if (csum < 0) goto out_drop; /* allow CONTROL frames egress from main VSI if FW LLDP disabled */ eth = (struct ethhdr *)skb_mac_header(skb); if (unlikely((skb->priority == TC_PRIO_CONTROL || eth->h_proto == htons(ETH_P_LLDP)) && vsi->type == ICE_VSI_PF && vsi->port_info->qos_cfg.is_sw_lldp)) offload.cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX | ICE_TX_CTX_DESC_SWTCH_UPLINK << ICE_TXD_CTX_QW1_CMD_S); ice_tstamp(tx_ring, skb, first, &offload); if (ice_is_switchdev_running(vsi->back) && vsi->type != ICE_VSI_SF) ice_eswitch_set_target_vsi(skb, &offload); if (offload.cd_qw1 & ICE_TX_DESC_DTYPE_CTX) { struct ice_tx_ctx_desc *cdesc; u16 i = tx_ring->next_to_use; /* grab the next descriptor */ cdesc = ICE_TX_CTX_DESC(tx_ring, i); i++; tx_ring->next_to_use = (i < tx_ring->count) ? i : 0; /* setup context descriptor */ cdesc->tunneling_params = cpu_to_le32(offload.cd_tunnel_params); cdesc->l2tag2 = cpu_to_le16(offload.cd_l2tag2); cdesc->rsvd = cpu_to_le16(0); cdesc->qw1 = cpu_to_le64(offload.cd_qw1); } ice_tx_map(tx_ring, first, &offload); return NETDEV_TX_OK; out_drop: ice_trace(xmit_frame_ring_drop, tx_ring, skb); dev_kfree_skb_any(skb); return NETDEV_TX_OK; } /** * ice_start_xmit - Selects the correct VSI and Tx queue to send buffer * @skb: send buffer * @netdev: network interface device structure * * Returns NETDEV_TX_OK if sent, else an error code */ netdev_tx_t ice_start_xmit(struct sk_buff *skb, struct net_device *netdev) { struct ice_netdev_priv *np = netdev_priv(netdev); struct ice_vsi *vsi = np->vsi; struct ice_tx_ring *tx_ring; tx_ring = vsi->tx_rings[skb->queue_mapping]; /* hardware can't handle really short frames, hardware padding works * beyond this point */ if (skb_put_padto(skb, ICE_MIN_TX_LEN)) return NETDEV_TX_OK; return ice_xmit_frame_ring(skb, tx_ring); } /** * ice_get_dscp_up - return the UP/TC value for a SKB * @dcbcfg: DCB config that contains DSCP to UP/TC mapping * @skb: SKB to query for info to determine UP/TC * * This function is to only be called when the PF is in L3 DSCP PFC mode */ static u8 ice_get_dscp_up(struct ice_dcbx_cfg *dcbcfg, struct sk_buff *skb) { u8 dscp = 0; if (skb->protocol == htons(ETH_P_IP)) dscp = ipv4_get_dsfield(ip_hdr(skb)) >> 2; else if (skb->protocol == htons(ETH_P_IPV6)) dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2; return dcbcfg->dscp_map[dscp]; } u16 ice_select_queue(struct net_device *netdev, struct sk_buff *skb, struct net_device *sb_dev) { struct ice_pf *pf = ice_netdev_to_pf(netdev); struct ice_dcbx_cfg *dcbcfg; dcbcfg = &pf->hw.port_info->qos_cfg.local_dcbx_cfg; if (dcbcfg->pfc_mode == ICE_QOS_MODE_DSCP) skb->priority = ice_get_dscp_up(dcbcfg, skb); return netdev_pick_tx(netdev, skb, sb_dev); } /** * ice_clean_ctrl_tx_irq - interrupt handler for flow director Tx queue * @tx_ring: tx_ring to clean */ void ice_clean_ctrl_tx_irq(struct ice_tx_ring *tx_ring) { struct ice_vsi *vsi = tx_ring->vsi; s16 i = tx_ring->next_to_clean; int budget = ICE_DFLT_IRQ_WORK; struct ice_tx_desc *tx_desc; struct ice_tx_buf *tx_buf; tx_buf = &tx_ring->tx_buf[i]; tx_desc = ICE_TX_DESC(tx_ring, i); i -= tx_ring->count; do { struct ice_tx_desc *eop_desc = tx_buf->next_to_watch; /* if next_to_watch is not set then there is no pending work */ if (!eop_desc) break; /* prevent any other reads prior to eop_desc */ smp_rmb(); /* if the descriptor isn't done, no work to do */ if (!(eop_desc->cmd_type_offset_bsz & cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE))) break; /* clear next_to_watch to prevent false hangs */ tx_buf->next_to_watch = NULL; tx_desc->buf_addr = 0; tx_desc->cmd_type_offset_bsz = 0; /* move past filter desc */ tx_buf++; tx_desc++; i++; if (unlikely(!i)) { i -= tx_ring->count; tx_buf = tx_ring->tx_buf; tx_desc = ICE_TX_DESC(tx_ring, 0); } /* unmap the data header */ if (dma_unmap_len(tx_buf, len)) dma_unmap_single(tx_ring->dev, dma_unmap_addr(tx_buf, dma), dma_unmap_len(tx_buf, len), DMA_TO_DEVICE); if (tx_buf->type == ICE_TX_BUF_DUMMY) devm_kfree(tx_ring->dev, tx_buf->raw_buf); /* clear next_to_watch to prevent false hangs */ tx_buf->type = ICE_TX_BUF_EMPTY; tx_buf->tx_flags = 0; tx_buf->next_to_watch = NULL; dma_unmap_len_set(tx_buf, len, 0); tx_desc->buf_addr = 0; tx_desc->cmd_type_offset_bsz = 0; /* move past eop_desc for start of next FD desc */ tx_buf++; tx_desc++; i++; if (unlikely(!i)) { i -= tx_ring->count; tx_buf = tx_ring->tx_buf; tx_desc = ICE_TX_DESC(tx_ring, 0); } budget--; } while (likely(budget)); i += tx_ring->count; tx_ring->next_to_clean = i; /* re-enable interrupt if needed */ ice_irq_dynamic_ena(&vsi->back->hw, vsi, vsi->q_vectors[0]); }