diff --git a/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c index 3cf493a51b8d0..e761f12d8901d 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c +++ b/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c @@ -1,6 +1,8 @@ // SPDX-License-Identifier: GPL-2.0-only /* Copyright (C) 2023 Intel Corporation */ +#include + #include "idpf.h" /** @@ -176,6 +178,58 @@ static int idpf_tx_singleq_csum(struct sk_buff *skb, return 1; } +/** + * idpf_tx_singleq_dma_map_error - handle TX DMA map errors + * @txq: queue to send buffer on + * @skb: send buffer + * @first: original first buffer info buffer for packet + * @idx: starting point on ring to unwind + */ +static void idpf_tx_singleq_dma_map_error(struct idpf_tx_queue *txq, + struct sk_buff *skb, + struct idpf_tx_buf *first, u16 idx) +{ + struct libeth_sq_napi_stats ss = { }; + struct libeth_cq_pp cp = { + .dev = txq->dev, + .ss = &ss, + }; + + u64_stats_update_begin(&txq->stats_sync); + u64_stats_inc(&txq->q_stats.dma_map_errs); + u64_stats_update_end(&txq->stats_sync); + + /* clear dma mappings for failed tx_buf map */ + for (;;) { + struct idpf_tx_buf *tx_buf; + + tx_buf = &txq->tx_buf[idx]; + libeth_tx_complete(tx_buf, &cp); + if (tx_buf == first) + break; + if (idx == 0) + idx = txq->desc_count; + idx--; + } + + if (skb_is_gso(skb)) { + union idpf_tx_flex_desc *tx_desc; + + /* If we failed a DMA mapping for a TSO packet, we will have + * used one additional descriptor for a context + * descriptor. Reset that here. + */ + tx_desc = &txq->flex_tx[idx]; + memset(tx_desc, 0, sizeof(*tx_desc)); + if (idx == 0) + idx = txq->desc_count; + idx--; + } + + /* Update tail in case netdev_xmit_more was previously true */ + idpf_tx_buf_hw_update(txq, idx, false); +} + /** * idpf_tx_singleq_map - Build the Tx base descriptor * @tx_q: queue to send buffer on @@ -216,12 +270,14 @@ static void idpf_tx_singleq_map(struct idpf_tx_queue *tx_q, for (frag = &skb_shinfo(skb)->frags[0];; frag++) { unsigned int max_data = IDPF_TX_MAX_DESC_DATA_ALIGNED; - if (dma_mapping_error(tx_q->dev, dma)) - return idpf_tx_dma_map_error(tx_q, skb, first, i); + if (unlikely(dma_mapping_error(tx_q->dev, dma))) + return idpf_tx_singleq_dma_map_error(tx_q, skb, + first, i); /* record length, and DMA address */ dma_unmap_len_set(tx_buf, len, size); dma_unmap_addr_set(tx_buf, dma, dma); + tx_buf->type = LIBETH_SQE_FRAG; /* align size to end of page */ max_data += -dma & (IDPF_TX_MAX_READ_REQ_SIZE - 1); @@ -235,14 +291,17 @@ static void idpf_tx_singleq_map(struct idpf_tx_queue *tx_q, offsets, max_data, td_tag); - tx_desc++; - i++; - - if (i == tx_q->desc_count) { + if (unlikely(++i == tx_q->desc_count)) { + tx_buf = &tx_q->tx_buf[0]; tx_desc = &tx_q->base_tx[0]; i = 0; + } else { + tx_buf++; + tx_desc++; } + tx_buf->type = LIBETH_SQE_EMPTY; + dma += max_data; size -= max_data; @@ -255,12 +314,14 @@ static void idpf_tx_singleq_map(struct idpf_tx_queue *tx_q, tx_desc->qw1 = idpf_tx_singleq_build_ctob(td_cmd, offsets, size, td_tag); - tx_desc++; - i++; - if (i == tx_q->desc_count) { + if (unlikely(++i == tx_q->desc_count)) { + tx_buf = &tx_q->tx_buf[0]; tx_desc = &tx_q->base_tx[0]; i = 0; + } else { + tx_buf++; + tx_desc++; } size = skb_frag_size(frag); @@ -268,8 +329,6 @@ static void idpf_tx_singleq_map(struct idpf_tx_queue *tx_q, dma = skb_frag_dma_map(tx_q->dev, frag, 0, size, DMA_TO_DEVICE); - - tx_buf = &tx_q->tx_buf[i]; } skb_tx_timestamp(first->skb); @@ -280,13 +339,13 @@ static void idpf_tx_singleq_map(struct idpf_tx_queue *tx_q, tx_desc->qw1 = idpf_tx_singleq_build_ctob(td_cmd, offsets, size, td_tag); - IDPF_SINGLEQ_BUMP_RING_IDX(tx_q, i); + first->type = LIBETH_SQE_SKB; + first->rs_idx = i; - /* set next_to_watch value indicating a packet is present */ - first->next_to_watch = tx_desc; + IDPF_SINGLEQ_BUMP_RING_IDX(tx_q, i); nq = netdev_get_tx_queue(tx_q->netdev, tx_q->idx); - netdev_tx_sent_queue(nq, first->bytecount); + netdev_tx_sent_queue(nq, first->bytes); idpf_tx_buf_hw_update(tx_q, i, netdev_xmit_more()); } @@ -304,8 +363,7 @@ idpf_tx_singleq_get_ctx_desc(struct idpf_tx_queue *txq) struct idpf_base_tx_ctx_desc *ctx_desc; int ntu = txq->next_to_use; - memset(&txq->tx_buf[ntu], 0, sizeof(struct idpf_tx_buf)); - txq->tx_buf[ntu].ctx_entry = true; + txq->tx_buf[ntu].type = LIBETH_SQE_CTX; ctx_desc = &txq->base_ctx[ntu]; @@ -356,11 +414,11 @@ netdev_tx_t idpf_tx_singleq_frame(struct sk_buff *skb, { struct idpf_tx_offload_params offload = { }; struct idpf_tx_buf *first; + u32 count, buf_count = 1; int csum, tso, needed; - unsigned int count; __be16 protocol; - count = idpf_tx_desc_count_required(tx_q, skb); + count = idpf_tx_res_count_required(tx_q, skb, &buf_count); if (unlikely(!count)) return idpf_tx_drop_skb(tx_q, skb); @@ -399,11 +457,11 @@ netdev_tx_t idpf_tx_singleq_frame(struct sk_buff *skb, first->skb = skb; if (tso) { - first->gso_segs = offload.tso_segs; - first->bytecount = skb->len + ((first->gso_segs - 1) * offload.tso_hdr_len); + first->packets = offload.tso_segs; + first->bytes = skb->len + ((first->packets - 1) * offload.tso_hdr_len); } else { - first->bytecount = max_t(unsigned int, skb->len, ETH_ZLEN); - first->gso_segs = 1; + first->bytes = max_t(unsigned int, skb->len, ETH_ZLEN); + first->packets = 1; } idpf_tx_singleq_map(tx_q, first, &offload); @@ -423,10 +481,15 @@ netdev_tx_t idpf_tx_singleq_frame(struct sk_buff *skb, static bool idpf_tx_singleq_clean(struct idpf_tx_queue *tx_q, int napi_budget, int *cleaned) { - unsigned int total_bytes = 0, total_pkts = 0; + struct libeth_sq_napi_stats ss = { }; struct idpf_base_tx_desc *tx_desc; u32 budget = tx_q->clean_budget; s16 ntc = tx_q->next_to_clean; + struct libeth_cq_pp cp = { + .dev = tx_q->dev, + .ss = &ss, + .napi = napi_budget, + }; struct idpf_netdev_priv *np; struct idpf_tx_buf *tx_buf; struct netdev_queue *nq; @@ -444,47 +507,26 @@ static bool idpf_tx_singleq_clean(struct idpf_tx_queue *tx_q, int napi_budget, * such. We can skip this descriptor since there is no buffer * to clean. */ - if (tx_buf->ctx_entry) { - /* Clear this flag here to avoid stale flag values when - * this buffer is used for actual data in the future. - * There are cases where the tx_buf struct / the flags - * field will not be cleared before being reused. - */ - tx_buf->ctx_entry = false; + if (unlikely(tx_buf->type <= LIBETH_SQE_CTX)) { + tx_buf->type = LIBETH_SQE_EMPTY; goto fetch_next_txq_desc; } - /* if next_to_watch is not set then no work pending */ - eop_desc = (struct idpf_base_tx_desc *)tx_buf->next_to_watch; - if (!eop_desc) + if (unlikely(tx_buf->type != LIBETH_SQE_SKB)) break; - /* prevent any other reads prior to eop_desc */ + /* prevent any other reads prior to type */ smp_rmb(); + eop_desc = &tx_q->base_tx[tx_buf->rs_idx]; + /* if the descriptor isn't done, no work yet to do */ if (!(eop_desc->qw1 & cpu_to_le64(IDPF_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; - - napi_consume_skb(tx_buf->skb, napi_budget); - - /* unmap skb header data */ - dma_unmap_single(tx_q->dev, - dma_unmap_addr(tx_buf, dma), - dma_unmap_len(tx_buf, len), - DMA_TO_DEVICE); - - /* clear tx_buf data */ - tx_buf->skb = NULL; - dma_unmap_len_set(tx_buf, len, 0); + libeth_tx_complete(tx_buf, &cp); /* unmap remaining buffers */ while (tx_desc != eop_desc) { @@ -498,13 +540,7 @@ static bool idpf_tx_singleq_clean(struct idpf_tx_queue *tx_q, int napi_budget, } /* unmap any remaining paged data */ - if (dma_unmap_len(tx_buf, len)) { - dma_unmap_page(tx_q->dev, - dma_unmap_addr(tx_buf, dma), - dma_unmap_len(tx_buf, len), - DMA_TO_DEVICE); - dma_unmap_len_set(tx_buf, len, 0); - } + libeth_tx_complete(tx_buf, &cp); } /* update budget only if we did something */ @@ -524,11 +560,11 @@ static bool idpf_tx_singleq_clean(struct idpf_tx_queue *tx_q, int napi_budget, ntc += tx_q->desc_count; tx_q->next_to_clean = ntc; - *cleaned += total_pkts; + *cleaned += ss.packets; u64_stats_update_begin(&tx_q->stats_sync); - u64_stats_add(&tx_q->q_stats.packets, total_pkts); - u64_stats_add(&tx_q->q_stats.bytes, total_bytes); + u64_stats_add(&tx_q->q_stats.packets, ss.packets); + u64_stats_add(&tx_q->q_stats.bytes, ss.bytes); u64_stats_update_end(&tx_q->stats_sync); np = netdev_priv(tx_q->netdev); @@ -536,7 +572,7 @@ static bool idpf_tx_singleq_clean(struct idpf_tx_queue *tx_q, int napi_budget, dont_wake = np->state != __IDPF_VPORT_UP || !netif_carrier_ok(tx_q->netdev); - __netif_txq_completed_wake(nq, total_pkts, total_bytes, + __netif_txq_completed_wake(nq, ss.packets, ss.bytes, IDPF_DESC_UNUSED(tx_q), IDPF_TX_WAKE_THRESH, dont_wake); diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c index e163e54d1c31e..24b255145f57c 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c @@ -1,42 +1,17 @@ // SPDX-License-Identifier: GPL-2.0-only /* Copyright (C) 2023 Intel Corporation */ +#include + #include "idpf.h" #include "idpf_virtchnl.h" +#define idpf_tx_buf_next(buf) (*(u32 *)&(buf)->priv) +LIBETH_SQE_CHECK_PRIV(u32); + static bool idpf_chk_linearize(struct sk_buff *skb, unsigned int max_bufs, unsigned int count); -/** - * idpf_buf_lifo_push - push a buffer pointer onto stack - * @stack: pointer to stack struct - * @buf: pointer to buf to push - * - * Returns 0 on success, negative on failure - **/ -static int idpf_buf_lifo_push(struct idpf_buf_lifo *stack, - struct idpf_tx_stash *buf) -{ - if (unlikely(stack->top == stack->size)) - return -ENOSPC; - - stack->bufs[stack->top++] = buf; - - return 0; -} - -/** - * idpf_buf_lifo_pop - pop a buffer pointer from stack - * @stack: pointer to stack struct - **/ -static struct idpf_tx_stash *idpf_buf_lifo_pop(struct idpf_buf_lifo *stack) -{ - if (unlikely(!stack->top)) - return NULL; - - return stack->bufs[--stack->top]; -} - /** * idpf_tx_timeout - Respond to a Tx Hang * @netdev: network interface device structure @@ -58,66 +33,29 @@ void idpf_tx_timeout(struct net_device *netdev, unsigned int txqueue) } } -/** - * idpf_tx_buf_rel - Release a Tx buffer - * @tx_q: the queue that owns the buffer - * @tx_buf: the buffer to free - */ -static void idpf_tx_buf_rel(struct idpf_tx_queue *tx_q, - struct idpf_tx_buf *tx_buf) -{ - if (tx_buf->skb) { - if (dma_unmap_len(tx_buf, len)) - dma_unmap_single(tx_q->dev, - dma_unmap_addr(tx_buf, dma), - dma_unmap_len(tx_buf, len), - DMA_TO_DEVICE); - dev_kfree_skb_any(tx_buf->skb); - } else if (dma_unmap_len(tx_buf, len)) { - dma_unmap_page(tx_q->dev, - dma_unmap_addr(tx_buf, dma), - dma_unmap_len(tx_buf, len), - DMA_TO_DEVICE); - } - - tx_buf->next_to_watch = NULL; - tx_buf->skb = NULL; - tx_buf->compl_tag = IDPF_SPLITQ_TX_INVAL_COMPL_TAG; - dma_unmap_len_set(tx_buf, len, 0); -} - /** * idpf_tx_buf_rel_all - Free any empty Tx buffers * @txq: queue to be cleaned */ static void idpf_tx_buf_rel_all(struct idpf_tx_queue *txq) { - struct idpf_buf_lifo *buf_stack; - u16 i; + struct libeth_sq_napi_stats ss = { }; + struct libeth_cq_pp cp = { + .dev = txq->dev, + .ss = &ss, + }; + u32 i; /* Buffers already cleared, nothing to do */ if (!txq->tx_buf) return; /* Free all the Tx buffer sk_buffs */ - for (i = 0; i < txq->desc_count; i++) - idpf_tx_buf_rel(txq, &txq->tx_buf[i]); + for (i = 0; i < txq->buf_pool_size; i++) + libeth_tx_complete(&txq->tx_buf[i], &cp); kfree(txq->tx_buf); txq->tx_buf = NULL; - - if (!idpf_queue_has(FLOW_SCH_EN, txq)) - return; - - buf_stack = &txq->stash->buf_stack; - if (!buf_stack->bufs) - return; - - for (i = 0; i < buf_stack->size; i++) - kfree(buf_stack->bufs[i]); - - kfree(buf_stack->bufs); - buf_stack->bufs = NULL; } /** @@ -129,10 +67,14 @@ static void idpf_tx_buf_rel_all(struct idpf_tx_queue *txq) static void idpf_tx_desc_rel(struct idpf_tx_queue *txq) { idpf_tx_buf_rel_all(txq); + netdev_tx_reset_subqueue(txq->netdev, txq->idx); if (!txq->desc_ring) return; + if (txq->refillq) + kfree(txq->refillq->ring); + dmam_free_coherent(txq->dev, txq->size, txq->desc_ring, txq->dma); txq->desc_ring = NULL; txq->next_to_use = 0; @@ -189,45 +131,18 @@ static void idpf_tx_desc_rel_all(struct idpf_vport *vport) */ static int idpf_tx_buf_alloc_all(struct idpf_tx_queue *tx_q) { - struct idpf_buf_lifo *buf_stack; - int buf_size; - int i; - /* Allocate book keeping buffers only. Buffers to be supplied to HW * are allocated by kernel network stack and received as part of skb */ - buf_size = sizeof(struct idpf_tx_buf) * tx_q->desc_count; - tx_q->tx_buf = kzalloc(buf_size, GFP_KERNEL); + if (idpf_queue_has(FLOW_SCH_EN, tx_q)) + tx_q->buf_pool_size = U16_MAX; + else + tx_q->buf_pool_size = tx_q->desc_count; + tx_q->tx_buf = kcalloc(tx_q->buf_pool_size, sizeof(*tx_q->tx_buf), + GFP_KERNEL); if (!tx_q->tx_buf) return -ENOMEM; - /* Initialize tx_bufs with invalid completion tags */ - for (i = 0; i < tx_q->desc_count; i++) - tx_q->tx_buf[i].compl_tag = IDPF_SPLITQ_TX_INVAL_COMPL_TAG; - - if (!idpf_queue_has(FLOW_SCH_EN, tx_q)) - return 0; - - buf_stack = &tx_q->stash->buf_stack; - - /* Initialize tx buf stack for out-of-order completions if - * flow scheduling offload is enabled - */ - buf_stack->bufs = kcalloc(tx_q->desc_count, sizeof(*buf_stack->bufs), - GFP_KERNEL); - if (!buf_stack->bufs) - return -ENOMEM; - - buf_stack->size = tx_q->desc_count; - buf_stack->top = tx_q->desc_count; - - for (i = 0; i < tx_q->desc_count; i++) { - buf_stack->bufs[i] = kzalloc(sizeof(*buf_stack->bufs[i]), - GFP_KERNEL); - if (!buf_stack->bufs[i]) - return -ENOMEM; - } - return 0; } @@ -242,7 +157,9 @@ static int idpf_tx_desc_alloc(const struct idpf_vport *vport, struct idpf_tx_queue *tx_q) { struct device *dev = tx_q->dev; + struct idpf_sw_queue *refillq; int err; + unsigned int i = 0; err = idpf_tx_buf_alloc_all(tx_q); if (err) @@ -265,6 +182,31 @@ static int idpf_tx_desc_alloc(const struct idpf_vport *vport, tx_q->next_to_clean = 0; idpf_queue_set(GEN_CHK, tx_q); + if (!idpf_queue_has(FLOW_SCH_EN, tx_q)) + return 0; + + refillq = tx_q->refillq; + refillq->desc_count = tx_q->buf_pool_size; + refillq->ring = kcalloc(refillq->desc_count, sizeof(u32), + GFP_KERNEL); + if (!refillq->ring) { + err = -ENOMEM; + goto err_alloc; + } + + for (i = 0; i < refillq->desc_count; i++) + refillq->ring[i] = + FIELD_PREP(IDPF_RFL_BI_BUFID_M, i) | + FIELD_PREP(IDPF_RFL_BI_GEN_M, + idpf_queue_has(GEN_CHK, refillq)); + + /* Go ahead and flip the GEN bit since this counts as filling + * up the ring, i.e. we already ring wrapped. + */ + idpf_queue_change(GEN_CHK, refillq); + + tx_q->last_re = tx_q->desc_count - IDPF_TX_SPLITQ_RE_MIN_GAP; + return 0; err_alloc: @@ -315,8 +257,6 @@ static int idpf_tx_desc_alloc_all(struct idpf_vport *vport) for (i = 0; i < vport->num_txq_grp; i++) { for (j = 0; j < vport->txq_grps[i].num_txq; j++) { struct idpf_tx_queue *txq = vport->txq_grps[i].txqs[j]; - u8 gen_bits = 0; - u16 bufidx_mask; err = idpf_tx_desc_alloc(vport, txq); if (err) { @@ -325,34 +265,6 @@ static int idpf_tx_desc_alloc_all(struct idpf_vport *vport) i); goto err_out; } - - if (!idpf_is_queue_model_split(vport->txq_model)) - continue; - - txq->compl_tag_cur_gen = 0; - - /* Determine the number of bits in the bufid - * mask and add one to get the start of the - * generation bits - */ - bufidx_mask = txq->desc_count - 1; - while (bufidx_mask >> 1) { - txq->compl_tag_gen_s++; - bufidx_mask = bufidx_mask >> 1; - } - txq->compl_tag_gen_s++; - - gen_bits = IDPF_TX_SPLITQ_COMPL_TAG_WIDTH - - txq->compl_tag_gen_s; - txq->compl_tag_gen_max = GETMAXVAL(gen_bits); - - /* Set bufid mask based on location of first - * gen bit; it cannot simply be the descriptor - * ring size-1 since we can have size values - * where not all of those bits are set. - */ - txq->compl_tag_bufid_m = - GETMAXVAL(txq->compl_tag_gen_s); } if (!idpf_is_queue_model_split(vport->txq_model)) @@ -586,18 +498,18 @@ static int idpf_rx_hdr_buf_alloc_all(struct idpf_buf_queue *bufq) } /** - * idpf_rx_post_buf_refill - Post buffer id to refill queue + * idpf_post_buf_refill - Post buffer id to refill queue * @refillq: refill queue to post to * @buf_id: buffer id to post */ -static void idpf_rx_post_buf_refill(struct idpf_sw_queue *refillq, u16 buf_id) +static void idpf_post_buf_refill(struct idpf_sw_queue *refillq, u16 buf_id) { u32 nta = refillq->next_to_use; /* store the buffer ID and the SW maintained GEN bit to the refillq */ refillq->ring[nta] = - FIELD_PREP(IDPF_RX_BI_BUFID_M, buf_id) | - FIELD_PREP(IDPF_RX_BI_GEN_M, + FIELD_PREP(IDPF_RFL_BI_BUFID_M, buf_id) | + FIELD_PREP(IDPF_RFL_BI_GEN_M, idpf_queue_has(GEN_CHK, refillq)); if (unlikely(++nta == refillq->desc_count)) { @@ -977,6 +889,11 @@ static void idpf_txq_group_rel(struct idpf_vport *vport) struct idpf_txq_group *txq_grp = &vport->txq_grps[i]; for (j = 0; j < txq_grp->num_txq; j++) { + if (flow_sch_en) { + kfree(txq_grp->txqs[j]->refillq); + txq_grp->txqs[j]->refillq = NULL; + } + kfree(txq_grp->txqs[j]); txq_grp->txqs[j] = NULL; } @@ -986,9 +903,6 @@ static void idpf_txq_group_rel(struct idpf_vport *vport) kfree(txq_grp->complq); txq_grp->complq = NULL; - - if (flow_sch_en) - kfree(txq_grp->stashes); } kfree(vport->txq_grps); vport->txq_grps = NULL; @@ -1347,7 +1261,6 @@ static int idpf_txq_group_alloc(struct idpf_vport *vport, u16 num_txq) for (i = 0; i < vport->num_txq_grp; i++) { struct idpf_txq_group *tx_qgrp = &vport->txq_grps[i]; struct idpf_adapter *adapter = vport->adapter; - struct idpf_txq_stash *stashes; int j; tx_qgrp->vport = vport; @@ -1360,15 +1273,6 @@ static int idpf_txq_group_alloc(struct idpf_vport *vport, u16 num_txq) goto err_alloc; } - if (split && flow_sch_en) { - stashes = kcalloc(num_txq, sizeof(*stashes), - GFP_KERNEL); - if (!stashes) - goto err_alloc; - - tx_qgrp->stashes = stashes; - } - for (j = 0; j < tx_qgrp->num_txq; j++) { struct idpf_tx_queue *q = tx_qgrp->txqs[j]; @@ -1388,12 +1292,14 @@ static int idpf_txq_group_alloc(struct idpf_vport *vport, u16 num_txq) if (!flow_sch_en) continue; - if (split) { - q->stash = &stashes[j]; - hash_init(q->stash->sched_buf_hash); - } - idpf_queue_set(FLOW_SCH_EN, q); + + q->refillq = kzalloc(sizeof(*q->refillq), GFP_KERNEL); + if (!q->refillq) + goto err_alloc; + + idpf_queue_set(GEN_CHK, q->refillq); + idpf_queue_set(RFL_GEN_CHK, q->refillq); } if (!split) @@ -1651,125 +1557,10 @@ static void idpf_tx_handle_sw_marker(struct idpf_tx_queue *tx_q) wake_up(&vport->sw_marker_wq); } -/** - * idpf_tx_splitq_clean_hdr - Clean TX buffer resources for header portion of - * packet - * @tx_q: tx queue to clean buffer from - * @tx_buf: buffer to be cleaned - * @cleaned: pointer to stats struct to track cleaned packets/bytes - * @napi_budget: Used to determine if we are in netpoll - */ -static void idpf_tx_splitq_clean_hdr(struct idpf_tx_queue *tx_q, - struct idpf_tx_buf *tx_buf, - struct idpf_cleaned_stats *cleaned, - int napi_budget) -{ - napi_consume_skb(tx_buf->skb, napi_budget); - - if (dma_unmap_len(tx_buf, len)) { - dma_unmap_single(tx_q->dev, - dma_unmap_addr(tx_buf, dma), - dma_unmap_len(tx_buf, len), - DMA_TO_DEVICE); - - dma_unmap_len_set(tx_buf, len, 0); - } - - /* clear tx_buf data */ - tx_buf->skb = NULL; - - cleaned->bytes += tx_buf->bytecount; - cleaned->packets += tx_buf->gso_segs; -} - -/** - * idpf_tx_clean_stashed_bufs - clean bufs that were stored for - * out of order completions - * @txq: queue to clean - * @compl_tag: completion tag of packet to clean (from completion descriptor) - * @cleaned: pointer to stats struct to track cleaned packets/bytes - * @budget: Used to determine if we are in netpoll - */ -static void idpf_tx_clean_stashed_bufs(struct idpf_tx_queue *txq, - u16 compl_tag, - struct idpf_cleaned_stats *cleaned, - int budget) -{ - struct idpf_tx_stash *stash; - struct hlist_node *tmp_buf; - - /* Buffer completion */ - hash_for_each_possible_safe(txq->stash->sched_buf_hash, stash, tmp_buf, - hlist, compl_tag) { - if (unlikely(stash->buf.compl_tag != (int)compl_tag)) - continue; - - if (stash->buf.skb) { - idpf_tx_splitq_clean_hdr(txq, &stash->buf, cleaned, - budget); - } else if (dma_unmap_len(&stash->buf, len)) { - dma_unmap_page(txq->dev, - dma_unmap_addr(&stash->buf, dma), - dma_unmap_len(&stash->buf, len), - DMA_TO_DEVICE); - dma_unmap_len_set(&stash->buf, len, 0); - } - - /* Push shadow buf back onto stack */ - idpf_buf_lifo_push(&txq->stash->buf_stack, stash); - - hash_del(&stash->hlist); - } -} - -/** - * idpf_stash_flow_sch_buffers - store buffer parameters info to be freed at a - * later time (only relevant for flow scheduling mode) - * @txq: Tx queue to clean - * @tx_buf: buffer to store - */ -static int idpf_stash_flow_sch_buffers(struct idpf_tx_queue *txq, - struct idpf_tx_buf *tx_buf) -{ - struct idpf_tx_stash *stash; - - if (unlikely(!dma_unmap_addr(tx_buf, dma) && - !dma_unmap_len(tx_buf, len))) - return 0; - - stash = idpf_buf_lifo_pop(&txq->stash->buf_stack); - if (unlikely(!stash)) { - net_err_ratelimited("%s: No out-of-order TX buffers left!\n", - netdev_name(txq->netdev)); - - return -ENOMEM; - } - - /* Store buffer params in shadow buffer */ - stash->buf.skb = tx_buf->skb; - stash->buf.bytecount = tx_buf->bytecount; - stash->buf.gso_segs = tx_buf->gso_segs; - dma_unmap_addr_set(&stash->buf, dma, dma_unmap_addr(tx_buf, dma)); - dma_unmap_len_set(&stash->buf, len, dma_unmap_len(tx_buf, len)); - stash->buf.compl_tag = tx_buf->compl_tag; - - /* Add buffer to buf_hash table to be freed later */ - hash_add(txq->stash->sched_buf_hash, &stash->hlist, - stash->buf.compl_tag); - - memset(tx_buf, 0, sizeof(struct idpf_tx_buf)); - - /* Reinitialize buf_id portion of tag */ - tx_buf->compl_tag = IDPF_SPLITQ_TX_INVAL_COMPL_TAG; - - return 0; -} - #define idpf_tx_splitq_clean_bump_ntc(txq, ntc, desc, buf) \ do { \ - (ntc)++; \ - if (unlikely(!(ntc))) { \ - ntc -= (txq)->desc_count; \ + if (unlikely(++(ntc) == (txq)->desc_count)) { \ + ntc = 0; \ buf = (txq)->tx_buf; \ desc = &(txq)->flex_tx[0]; \ } else { \ @@ -1796,156 +1587,95 @@ do { \ */ static void idpf_tx_splitq_clean(struct idpf_tx_queue *tx_q, u16 end, int napi_budget, - struct idpf_cleaned_stats *cleaned, + struct libeth_sq_napi_stats *cleaned, bool descs_only) { union idpf_tx_flex_desc *next_pending_desc = NULL; union idpf_tx_flex_desc *tx_desc; - s16 ntc = tx_q->next_to_clean; + u32 ntc = tx_q->next_to_clean; + struct libeth_cq_pp cp = { + .dev = tx_q->dev, + .ss = cleaned, + .napi = napi_budget, + }; struct idpf_tx_buf *tx_buf; + if (descs_only) { + /* Bump ring index to mark as cleaned. */ + tx_q->next_to_clean = end; + return; + } + tx_desc = &tx_q->flex_tx[ntc]; next_pending_desc = &tx_q->flex_tx[end]; tx_buf = &tx_q->tx_buf[ntc]; - ntc -= tx_q->desc_count; while (tx_desc != next_pending_desc) { - union idpf_tx_flex_desc *eop_desc; + u32 eop_idx; /* If this entry in the ring was used as a context descriptor, - * it's corresponding entry in the buffer ring will have an - * invalid completion tag since no buffer was used. We can - * skip this descriptor since there is no buffer to clean. + * it's corresponding entry in the buffer ring is reserved. We + * can skip this descriptor since there is no buffer to clean. */ - if (unlikely(tx_buf->compl_tag == IDPF_SPLITQ_TX_INVAL_COMPL_TAG)) + if (tx_buf->type <= LIBETH_SQE_CTX) goto fetch_next_txq_desc; - eop_desc = (union idpf_tx_flex_desc *)tx_buf->next_to_watch; - - /* clear next_to_watch to prevent false hangs */ - tx_buf->next_to_watch = NULL; + if (unlikely(tx_buf->type != LIBETH_SQE_SKB)) + break; - if (descs_only) { - if (idpf_stash_flow_sch_buffers(tx_q, tx_buf)) - goto tx_splitq_clean_out; + eop_idx = tx_buf->rs_idx; + libeth_tx_complete(tx_buf, &cp); - while (tx_desc != eop_desc) { - idpf_tx_splitq_clean_bump_ntc(tx_q, ntc, - tx_desc, tx_buf); + /* unmap remaining buffers */ + while (ntc != eop_idx) { + idpf_tx_splitq_clean_bump_ntc(tx_q, ntc, + tx_desc, tx_buf); - if (dma_unmap_len(tx_buf, len)) { - if (idpf_stash_flow_sch_buffers(tx_q, - tx_buf)) - goto tx_splitq_clean_out; - } - } - } else { - idpf_tx_splitq_clean_hdr(tx_q, tx_buf, cleaned, - napi_budget); - - /* unmap remaining buffers */ - while (tx_desc != eop_desc) { - idpf_tx_splitq_clean_bump_ntc(tx_q, ntc, - tx_desc, tx_buf); - - /* unmap any remaining paged data */ - if (dma_unmap_len(tx_buf, len)) { - dma_unmap_page(tx_q->dev, - dma_unmap_addr(tx_buf, dma), - dma_unmap_len(tx_buf, len), - DMA_TO_DEVICE); - dma_unmap_len_set(tx_buf, len, 0); - } - } + /* unmap any remaining paged data */ + libeth_tx_complete(tx_buf, &cp); } fetch_next_txq_desc: idpf_tx_splitq_clean_bump_ntc(tx_q, ntc, tx_desc, tx_buf); } -tx_splitq_clean_out: - ntc += tx_q->desc_count; tx_q->next_to_clean = ntc; } -#define idpf_tx_clean_buf_ring_bump_ntc(txq, ntc, buf) \ -do { \ - (buf)++; \ - (ntc)++; \ - if (unlikely((ntc) == (txq)->desc_count)) { \ - buf = (txq)->tx_buf; \ - ntc = 0; \ - } \ -} while (0) - /** - * idpf_tx_clean_buf_ring - clean flow scheduling TX queue buffers + * idpf_tx_clean_bufs - clean flow scheduling TX queue buffers * @txq: queue to clean - * @compl_tag: completion tag of packet to clean (from completion descriptor) + * @buf_id: packet's starting buffer ID, from completion descriptor * @cleaned: pointer to stats struct to track cleaned packets/bytes * @budget: Used to determine if we are in netpoll * - * Cleans all buffers associated with the input completion tag either from the - * TX buffer ring or from the hash table if the buffers were previously - * stashed. Returns the byte/segment count for the cleaned packet associated - * this completion tag. + * Clean all buffers associated with the packet starting at buf_id. Returns the + * byte/segment count for the cleaned packet. */ -static bool idpf_tx_clean_buf_ring(struct idpf_tx_queue *txq, u16 compl_tag, - struct idpf_cleaned_stats *cleaned, - int budget) +static void idpf_tx_clean_bufs(struct idpf_tx_queue *txq, u32 buf_id, + struct libeth_sq_napi_stats *cleaned, + int budget) { - u16 idx = compl_tag & txq->compl_tag_bufid_m; struct idpf_tx_buf *tx_buf = NULL; - u16 ntc = txq->next_to_clean; - u16 num_descs_cleaned = 0; - u16 orig_idx = idx; - - tx_buf = &txq->tx_buf[idx]; - - while (tx_buf->compl_tag == (int)compl_tag) { - if (tx_buf->skb) { - idpf_tx_splitq_clean_hdr(txq, tx_buf, cleaned, budget); - } else if (dma_unmap_len(tx_buf, len)) { - dma_unmap_page(txq->dev, - dma_unmap_addr(tx_buf, dma), - dma_unmap_len(tx_buf, len), - DMA_TO_DEVICE); - dma_unmap_len_set(tx_buf, len, 0); - } - - memset(tx_buf, 0, sizeof(struct idpf_tx_buf)); - tx_buf->compl_tag = IDPF_SPLITQ_TX_INVAL_COMPL_TAG; + struct libeth_cq_pp cp = { + .dev = txq->dev, + .ss = cleaned, + .napi = budget, + }; - num_descs_cleaned++; - idpf_tx_clean_buf_ring_bump_ntc(txq, idx, tx_buf); + tx_buf = &txq->tx_buf[buf_id]; + if (tx_buf->type == LIBETH_SQE_SKB) { + libeth_tx_complete(tx_buf, &cp); + idpf_post_buf_refill(txq->refillq, buf_id); } - /* If we didn't clean anything on the ring for this completion, there's - * nothing more to do. - */ - if (unlikely(!num_descs_cleaned)) - return false; + while (idpf_tx_buf_next(tx_buf) != IDPF_TXBUF_NULL) { + buf_id = idpf_tx_buf_next(tx_buf); - /* Otherwise, if we did clean a packet on the ring directly, it's safe - * to assume that the descriptors starting from the original - * next_to_clean up until the previously cleaned packet can be reused. - * Therefore, we will go back in the ring and stash any buffers still - * in the ring into the hash table to be cleaned later. - */ - tx_buf = &txq->tx_buf[ntc]; - while (tx_buf != &txq->tx_buf[orig_idx]) { - idpf_stash_flow_sch_buffers(txq, tx_buf); - idpf_tx_clean_buf_ring_bump_ntc(txq, ntc, tx_buf); + tx_buf = &txq->tx_buf[buf_id]; + libeth_tx_complete(tx_buf, &cp); + idpf_post_buf_refill(txq->refillq, buf_id); } - - /* Finally, update next_to_clean to reflect the work that was just done - * on the ring, if any. If the packet was only cleaned from the hash - * table, the ring will not be impacted, therefore we should not touch - * next_to_clean. The updated idx is used here - */ - txq->next_to_clean = idx; - - return true; } /** @@ -1961,24 +1691,20 @@ static bool idpf_tx_clean_buf_ring(struct idpf_tx_queue *txq, u16 compl_tag, */ static void idpf_tx_handle_rs_completion(struct idpf_tx_queue *txq, struct idpf_splitq_tx_compl_desc *desc, - struct idpf_cleaned_stats *cleaned, + struct libeth_sq_napi_stats *cleaned, int budget) { - u16 compl_tag; + /* RS completion contains queue head for queue based scheduling or + * completion tag for flow based scheduling. + */ + u16 rs_compl_val = le16_to_cpu(desc->q_head_compl_tag.q_head); if (!idpf_queue_has(FLOW_SCH_EN, txq)) { - u16 head = le16_to_cpu(desc->q_head_compl_tag.q_head); - - return idpf_tx_splitq_clean(txq, head, budget, cleaned, false); + idpf_tx_splitq_clean(txq, rs_compl_val, budget, cleaned, false); + return; } - compl_tag = le16_to_cpu(desc->q_head_compl_tag.compl_tag); - - /* If we didn't clean anything on the ring, this packet must be - * in the hash table. Go clean it there. - */ - if (!idpf_tx_clean_buf_ring(txq, compl_tag, cleaned, budget)) - idpf_tx_clean_stashed_bufs(txq, compl_tag, cleaned, budget); + idpf_tx_clean_bufs(txq, rs_compl_val, cleaned, budget); } /** @@ -2004,7 +1730,7 @@ static bool idpf_tx_clean_complq(struct idpf_compl_queue *complq, int budget, ntc -= complq->desc_count; do { - struct idpf_cleaned_stats cleaned_stats = { }; + struct libeth_sq_napi_stats cleaned_stats = { }; struct idpf_tx_queue *tx_q; int rel_tx_qid; u16 hw_head; @@ -2095,8 +1821,7 @@ static bool idpf_tx_clean_complq(struct idpf_compl_queue *complq, int budget, /* Update BQL */ nq = netdev_get_tx_queue(tx_q->netdev, tx_q->idx); - dont_wake = !complq_ok || IDPF_TX_BUF_RSV_LOW(tx_q) || - np->state != __IDPF_VPORT_UP || + dont_wake = !complq_ok || np->state != __IDPF_VPORT_UP || !netif_carrier_ok(tx_q->netdev); /* Check if the TXQ needs to and can be restarted */ __netif_txq_completed_wake(nq, tx_q->cleaned_pkts, tx_q->cleaned_bytes, @@ -2153,15 +1878,21 @@ void idpf_tx_splitq_build_flow_desc(union idpf_tx_flex_desc *desc, desc->flow.qw1.compl_tag = cpu_to_le16(params->compl_tag); } -/* Global conditions to tell whether the txq (and related resources) - * has room to allow the use of "size" descriptors. +/** + * idpf_tx_splitq_has_room - check if enough Tx splitq resources are available + * @tx_q: the queue to be checked + * @descs_needed: number of descriptors required for this packet + * @bufs_needed: number of Tx buffers required for this packet + * + * Return: 0 if no room available, 1 otherwise */ -static int idpf_txq_has_room(struct idpf_tx_queue *tx_q, u32 size) +static int idpf_txq_has_room(struct idpf_tx_queue *tx_q, u32 descs_needed, + u32 bufs_needed) { - if (IDPF_DESC_UNUSED(tx_q) < size || + if (IDPF_DESC_UNUSED(tx_q) < descs_needed || IDPF_TX_COMPLQ_PENDING(tx_q->txq_grp) > IDPF_TX_COMPLQ_OVERFLOW_THRESH(tx_q->txq_grp->complq) || - IDPF_TX_BUF_RSV_LOW(tx_q)) + idpf_tx_splitq_get_free_bufs(tx_q->refillq) < bufs_needed) return 0; return 1; } @@ -2170,14 +1901,21 @@ static int idpf_txq_has_room(struct idpf_tx_queue *tx_q, u32 size) * idpf_tx_maybe_stop_splitq - 1st level check for Tx splitq stop conditions * @tx_q: the queue to be checked * @descs_needed: number of descriptors required for this packet + * @bufs_needed: number of buffers needed for this packet * - * Returns 0 if stop is not needed + * Return: 0 if stop is not needed */ static int idpf_tx_maybe_stop_splitq(struct idpf_tx_queue *tx_q, - unsigned int descs_needed) + u32 descs_needed, + u32 bufs_needed) { + /* Since we have multiple resources to check for splitq, our + * start,stop_thrs becomes a boolean check instead of a count + * threshold. + */ if (netif_subqueue_maybe_stop(tx_q->netdev, tx_q->idx, - idpf_txq_has_room(tx_q, descs_needed), + idpf_txq_has_room(tx_q, descs_needed, + bufs_needed), 1, 1)) return 0; @@ -2219,14 +1957,16 @@ void idpf_tx_buf_hw_update(struct idpf_tx_queue *tx_q, u32 val, } /** - * idpf_tx_desc_count_required - calculate number of Tx descriptors needed + * idpf_tx_res_count_required - get number of Tx resources needed for this pkt * @txq: queue to send buffer on * @skb: send buffer + * @bufs_needed: (output) number of buffers needed for this skb. * - * Returns number of data descriptors needed for this skb. + * Return: number of data descriptors and buffers needed for this skb. */ -unsigned int idpf_tx_desc_count_required(struct idpf_tx_queue *txq, - struct sk_buff *skb) +unsigned int idpf_tx_res_count_required(struct idpf_tx_queue *txq, + struct sk_buff *skb, + u32 *bufs_needed) { const struct skb_shared_info *shinfo; unsigned int count = 0, i; @@ -2237,6 +1977,7 @@ unsigned int idpf_tx_desc_count_required(struct idpf_tx_queue *txq, return count; shinfo = skb_shinfo(skb); + *bufs_needed += shinfo->nr_frags; for (i = 0; i < shinfo->nr_frags; i++) { unsigned int size; @@ -2266,65 +2007,89 @@ unsigned int idpf_tx_desc_count_required(struct idpf_tx_queue *txq, } /** - * idpf_tx_dma_map_error - handle TX DMA map errors - * @txq: queue to send buffer on - * @skb: send buffer - * @first: original first buffer info buffer for packet - * @idx: starting point on ring to unwind + * idpf_tx_splitq_bump_ntu - adjust NTU and generation + * @txq: the tx ring to wrap + * @ntu: ring index to bump */ -void idpf_tx_dma_map_error(struct idpf_tx_queue *txq, struct sk_buff *skb, - struct idpf_tx_buf *first, u16 idx) +static unsigned int idpf_tx_splitq_bump_ntu(struct idpf_tx_queue *txq, u16 ntu) { - u64_stats_update_begin(&txq->stats_sync); - u64_stats_inc(&txq->q_stats.dma_map_errs); - u64_stats_update_end(&txq->stats_sync); + ntu++; - /* clear dma mappings for failed tx_buf map */ - for (;;) { - struct idpf_tx_buf *tx_buf; + if (ntu == txq->desc_count) + ntu = 0; - tx_buf = &txq->tx_buf[idx]; - idpf_tx_buf_rel(txq, tx_buf); - if (tx_buf == first) - break; - if (idx == 0) - idx = txq->desc_count; - idx--; - } + return ntu; +} - if (skb_is_gso(skb)) { - union idpf_tx_flex_desc *tx_desc; +/** + * idpf_tx_get_free_buf_id - get a free buffer ID from the refill queue + * @refillq: refill queue to get buffer ID from + * @buf_id: return buffer ID + * + * Return: true if a buffer ID was found, false if not + */ +static bool idpf_tx_get_free_buf_id(struct idpf_sw_queue *refillq, + u32 *buf_id) +{ + u32 ntc = refillq->next_to_clean; + u32 refill_desc; - /* If we failed a DMA mapping for a TSO packet, we will have - * used one additional descriptor for a context - * descriptor. Reset that here. - */ - tx_desc = &txq->flex_tx[idx]; - memset(tx_desc, 0, sizeof(struct idpf_flex_tx_ctx_desc)); - if (idx == 0) - idx = txq->desc_count; - idx--; + refill_desc = refillq->ring[ntc]; + + if (unlikely(idpf_queue_has(RFL_GEN_CHK, refillq) != + !!(refill_desc & IDPF_RFL_BI_GEN_M))) + return false; + + *buf_id = FIELD_GET(IDPF_RFL_BI_BUFID_M, refill_desc); + + if (unlikely(++ntc == refillq->desc_count)) { + idpf_queue_change(RFL_GEN_CHK, refillq); + ntc = 0; } - /* Update tail in case netdev_xmit_more was previously true */ - idpf_tx_buf_hw_update(txq, idx, false); + refillq->next_to_clean = ntc; + + return true; } /** - * idpf_tx_splitq_bump_ntu - adjust NTU and generation - * @txq: the tx ring to wrap - * @ntu: ring index to bump + * idpf_tx_splitq_pkt_err_unmap - Unmap buffers and bump tail in case of error + * @txq: Tx queue to unwind + * @params: pointer to splitq params struct + * @first: starting buffer for packet to unmap */ -static unsigned int idpf_tx_splitq_bump_ntu(struct idpf_tx_queue *txq, u16 ntu) +static void idpf_tx_splitq_pkt_err_unmap(struct idpf_tx_queue *txq, + struct idpf_tx_splitq_params *params, + struct idpf_tx_buf *first) { - ntu++; + struct idpf_sw_queue *refillq = txq->refillq; + struct libeth_sq_napi_stats ss = { }; + struct idpf_tx_buf *tx_buf = first; + struct libeth_cq_pp cp = { + .dev = txq->dev, + .ss = &ss, + }; - if (ntu == txq->desc_count) { - ntu = 0; - txq->compl_tag_cur_gen = IDPF_TX_ADJ_COMPL_TAG_GEN(txq); + u64_stats_update_begin(&txq->stats_sync); + u64_stats_inc(&txq->q_stats.dma_map_errs); + u64_stats_update_end(&txq->stats_sync); + + libeth_tx_complete(tx_buf, &cp); + while (idpf_tx_buf_next(tx_buf) != IDPF_TXBUF_NULL) { + tx_buf = &txq->tx_buf[idpf_tx_buf_next(tx_buf)]; + libeth_tx_complete(tx_buf, &cp); } - return ntu; + /* Update tail in case netdev_xmit_more was previously true. */ + idpf_tx_buf_hw_update(txq, params->prev_ntu, false); + + if (!refillq) + return; + + /* Restore refillq state to avoid leaking tags. */ + if (params->prev_refill_gen != idpf_queue_has(RFL_GEN_CHK, refillq)) + idpf_queue_change(RFL_GEN_CHK, refillq); + refillq->next_to_clean = params->prev_refill_ntc; } /** @@ -2348,6 +2113,7 @@ static void idpf_tx_splitq_map(struct idpf_tx_queue *tx_q, struct netdev_queue *nq; struct sk_buff *skb; skb_frag_t *frag; + u32 next_buf_id; u16 td_cmd = 0; dma_addr_t dma; @@ -2363,17 +2129,19 @@ static void idpf_tx_splitq_map(struct idpf_tx_queue *tx_q, dma = dma_map_single(tx_q->dev, skb->data, size, DMA_TO_DEVICE); tx_buf = first; - - params->compl_tag = - (tx_q->compl_tag_cur_gen << tx_q->compl_tag_gen_s) | i; + first->nr_frags = 0; for (frag = &skb_shinfo(skb)->frags[0];; frag++) { unsigned int max_data = IDPF_TX_MAX_DESC_DATA_ALIGNED; - if (dma_mapping_error(tx_q->dev, dma)) - return idpf_tx_dma_map_error(tx_q, skb, first, i); + if (unlikely(dma_mapping_error(tx_q->dev, dma))) { + idpf_tx_buf_next(tx_buf) = IDPF_TXBUF_NULL; + return idpf_tx_splitq_pkt_err_unmap(tx_q, params, + first); + } - tx_buf->compl_tag = params->compl_tag; + first->nr_frags++; + tx_buf->type = LIBETH_SQE_FRAG; /* record length, and DMA address */ dma_unmap_len_set(tx_buf, len, size); @@ -2427,29 +2195,13 @@ static void idpf_tx_splitq_map(struct idpf_tx_queue *tx_q, idpf_tx_splitq_build_desc(tx_desc, params, td_cmd, max_data); - tx_desc++; - i++; - - if (i == tx_q->desc_count) { + if (unlikely(++i == tx_q->desc_count)) { tx_desc = &tx_q->flex_tx[0]; i = 0; - tx_q->compl_tag_cur_gen = - IDPF_TX_ADJ_COMPL_TAG_GEN(tx_q); + } else { + tx_desc++; } - /* Since this packet has a buffer that is going to span - * multiple descriptors, it's going to leave holes in - * to the TX buffer ring. To ensure these holes do not - * cause issues in the cleaning routines, we will clear - * them of any stale data and assign them the same - * completion tag as the current packet. Then when the - * packet is being cleaned, the cleaning routines will - * simply pass over these holes and finish cleaning the - * rest of the packet. - */ - memset(&tx_q->tx_buf[i], 0, sizeof(struct idpf_tx_buf)); - tx_q->tx_buf[i].compl_tag = params->compl_tag; - /* Adjust the DMA offset and the remaining size of the * fragment. On the first iteration of this loop, * max_data will be >= 12K and <= 16K-1. On any @@ -2472,40 +2224,51 @@ static void idpf_tx_splitq_map(struct idpf_tx_queue *tx_q, break; idpf_tx_splitq_build_desc(tx_desc, params, td_cmd, size); - tx_desc++; - i++; - if (i == tx_q->desc_count) { + if (unlikely(++i == tx_q->desc_count)) { tx_desc = &tx_q->flex_tx[0]; i = 0; - tx_q->compl_tag_cur_gen = IDPF_TX_ADJ_COMPL_TAG_GEN(tx_q); + } else { + tx_desc++; + } + + if (idpf_queue_has(FLOW_SCH_EN, tx_q)) { + if (unlikely(!idpf_tx_get_free_buf_id(tx_q->refillq, + &next_buf_id))) { + idpf_tx_buf_next(tx_buf) = IDPF_TXBUF_NULL; + return idpf_tx_splitq_pkt_err_unmap(tx_q, params, + first); + } + } else { + next_buf_id = i; } + idpf_tx_buf_next(tx_buf) = next_buf_id; + tx_buf = &tx_q->tx_buf[next_buf_id]; size = skb_frag_size(frag); data_len -= size; dma = skb_frag_dma_map(tx_q->dev, frag, 0, size, DMA_TO_DEVICE); - - tx_buf = &tx_q->tx_buf[i]; } /* record SW timestamp if HW timestamp is not available */ skb_tx_timestamp(skb); + first->type = LIBETH_SQE_SKB; + /* write last descriptor with RS and EOP bits */ + first->rs_idx = i; + idpf_tx_buf_next(tx_buf) = IDPF_TXBUF_NULL; td_cmd |= params->eop_cmd; idpf_tx_splitq_build_desc(tx_desc, params, td_cmd, size); i = idpf_tx_splitq_bump_ntu(tx_q, i); - /* set next_to_watch value indicating a packet is present */ - first->next_to_watch = tx_desc; - tx_q->txq_grp->num_completions_pending++; /* record bytecount for BQL */ nq = netdev_get_tx_queue(tx_q->netdev, tx_q->idx); - netdev_tx_sent_queue(nq, first->bytecount); + netdev_tx_sent_queue(nq, first->bytes); idpf_tx_buf_hw_update(tx_q, i, netdev_xmit_more()); } @@ -2705,9 +2468,6 @@ idpf_tx_splitq_get_ctx_desc(struct idpf_tx_queue *txq) struct idpf_flex_tx_ctx_desc *desc; int i = txq->next_to_use; - memset(&txq->tx_buf[i], 0, sizeof(struct idpf_tx_buf)); - txq->tx_buf[i].compl_tag = IDPF_SPLITQ_TX_INVAL_COMPL_TAG; - /* grab the next descriptor */ desc = &txq->flex_ctx[i]; txq->next_to_use = idpf_tx_splitq_bump_ntu(txq, i); @@ -2733,6 +2493,21 @@ netdev_tx_t idpf_tx_drop_skb(struct idpf_tx_queue *tx_q, struct sk_buff *skb) return NETDEV_TX_OK; } +/** + * idpf_tx_splitq_need_re - check whether RE bit needs to be set + * @tx_q: pointer to Tx queue + * + * Return: true if RE bit needs to be set, false otherwise + */ +static bool idpf_tx_splitq_need_re(struct idpf_tx_queue *tx_q) +{ + int gap = tx_q->next_to_use - tx_q->last_re; + + gap += (gap < 0) ? tx_q->desc_count : 0; + + return gap >= IDPF_TX_SPLITQ_RE_MIN_GAP; +} + /** * idpf_tx_splitq_frame - Sends buffer on Tx ring using flex descriptors * @skb: send buffer @@ -2743,12 +2518,15 @@ netdev_tx_t idpf_tx_drop_skb(struct idpf_tx_queue *tx_q, struct sk_buff *skb) static netdev_tx_t idpf_tx_splitq_frame(struct sk_buff *skb, struct idpf_tx_queue *tx_q) { - struct idpf_tx_splitq_params tx_params = { }; + struct idpf_tx_splitq_params tx_params = { + .prev_ntu = tx_q->next_to_use, + }; struct idpf_tx_buf *first; - unsigned int count; + u32 count, buf_count = 1; int tso; + u32 buf_id; - count = idpf_tx_desc_count_required(tx_q, skb); + count = idpf_tx_res_count_required(tx_q, skb, &buf_count); if (unlikely(!count)) return idpf_tx_drop_skb(tx_q, skb); @@ -2758,7 +2536,7 @@ static netdev_tx_t idpf_tx_splitq_frame(struct sk_buff *skb, /* Check for splitq specific TX resources */ count += (IDPF_TX_DESCS_PER_CACHE_LINE + tso); - if (idpf_tx_maybe_stop_splitq(tx_q, count)) { + if (idpf_tx_maybe_stop_splitq(tx_q, count, buf_count)) { idpf_tx_buf_hw_update(tx_q, tx_q->next_to_use, false); return NETDEV_TX_BUSY; @@ -2785,36 +2563,47 @@ static netdev_tx_t idpf_tx_splitq_frame(struct sk_buff *skb, u64_stats_update_end(&tx_q->stats_sync); } - /* record the location of the first descriptor for this packet */ - first = &tx_q->tx_buf[tx_q->next_to_use]; - first->skb = skb; + if (idpf_queue_has(FLOW_SCH_EN, tx_q)) { + struct idpf_sw_queue *refillq = tx_q->refillq; - if (tso) { - first->gso_segs = tx_params.offload.tso_segs; - first->bytecount = skb->len + - ((first->gso_segs - 1) * tx_params.offload.tso_hdr_len); - } else { - first->gso_segs = 1; - first->bytecount = max_t(unsigned int, skb->len, ETH_ZLEN); - } + /* Save refillq state in case of a packet rollback. Otherwise, + * the tags will be leaked since they will be popped from the + * refillq but never reposted during cleaning. + */ + tx_params.prev_refill_gen = + idpf_queue_has(RFL_GEN_CHK, refillq); + tx_params.prev_refill_ntc = refillq->next_to_clean; + + if (unlikely(!idpf_tx_get_free_buf_id(tx_q->refillq, + &buf_id))) { + if (tx_params.prev_refill_gen != + idpf_queue_has(RFL_GEN_CHK, refillq)) + idpf_queue_change(RFL_GEN_CHK, refillq); + refillq->next_to_clean = tx_params.prev_refill_ntc; + + tx_q->next_to_use = tx_params.prev_ntu; + return idpf_tx_drop_skb(tx_q, skb); + } + tx_params.compl_tag = buf_id; - if (idpf_queue_has(FLOW_SCH_EN, tx_q)) { tx_params.dtype = IDPF_TX_DESC_DTYPE_FLEX_FLOW_SCHE; tx_params.eop_cmd = IDPF_TXD_FLEX_FLOW_CMD_EOP; - /* Set the RE bit to catch any packets that may have not been - * stashed during RS completion cleaning. MIN_GAP is set to - * MIN_RING size to ensure it will be set at least once each - * time around the ring. + /* Set the RE bit to periodically "clean" the descriptor ring. + * MIN_GAP is set to MIN_RING size to ensure it will be set at + * least once each time around the ring. */ - if (!(tx_q->next_to_use % IDPF_TX_SPLITQ_RE_MIN_GAP)) { + if (idpf_tx_splitq_need_re(tx_q)) { tx_params.eop_cmd |= IDPF_TXD_FLEX_FLOW_CMD_RE; tx_q->txq_grp->num_completions_pending++; + tx_q->last_re = tx_q->next_to_use; } if (skb->ip_summed == CHECKSUM_PARTIAL) tx_params.offload.td_cmd |= IDPF_TXD_FLEX_FLOW_CMD_CS_EN; } else { + buf_id = tx_q->next_to_use; + tx_params.dtype = IDPF_TX_DESC_DTYPE_FLEX_L2TAG1_L2TAG2; tx_params.eop_cmd = IDPF_TXD_LAST_DESC_CMD; @@ -2822,6 +2611,18 @@ static netdev_tx_t idpf_tx_splitq_frame(struct sk_buff *skb, tx_params.offload.td_cmd |= IDPF_TX_FLEX_DESC_CMD_CS_EN; } + first = &tx_q->tx_buf[buf_id]; + first->skb = skb; + + if (tso) { + first->packets = tx_params.offload.tso_segs; + first->bytes = skb->len + + ((first->packets - 1) * tx_params.offload.tso_hdr_len); + } else { + first->packets = 1; + first->bytes = max_t(unsigned int, skb->len, ETH_ZLEN); + } + idpf_tx_splitq_map(tx_q, &tx_params, first); return NETDEV_TX_OK; @@ -3375,7 +3176,7 @@ static int idpf_rx_splitq_clean(struct idpf_rx_queue *rxq, int budget) if (!skb) break; - idpf_rx_post_buf_refill(refillq, buf_id); + idpf_post_buf_refill(refillq, buf_id); IDPF_RX_BUMP_NTC(rxq, ntc); /* skip if it is non EOP desc */ @@ -3473,10 +3274,10 @@ static void idpf_rx_clean_refillq(struct idpf_buf_queue *bufq, bool failure; if (idpf_queue_has(RFL_GEN_CHK, refillq) != - !!(refill_desc & IDPF_RX_BI_GEN_M)) + !!(refill_desc & IDPF_RFL_BI_GEN_M)) break; - buf_id = FIELD_GET(IDPF_RX_BI_BUFID_M, refill_desc); + buf_id = FIELD_GET(IDPF_RFL_BI_BUFID_M, refill_desc); failure = idpf_rx_update_bufq_desc(bufq, buf_id, buf_desc); if (failure) break; diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.h b/drivers/net/ethernet/intel/idpf/idpf_txrx.h index f119f240d21cd..1011e25e9f925 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.h +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.h @@ -113,8 +113,8 @@ do { \ */ #define IDPF_TX_SPLITQ_RE_MIN_GAP 64 -#define IDPF_RX_BI_GEN_M BIT(16) -#define IDPF_RX_BI_BUFID_M GENMASK(15, 0) +#define IDPF_RFL_BI_GEN_M BIT(16) +#define IDPF_RFL_BI_BUFID_M GENMASK(15, 0) #define IDPF_RXD_EOF_SPLITQ VIRTCHNL2_RX_FLEX_DESC_ADV_STATUS0_EOF_M #define IDPF_RXD_EOF_SINGLEQ VIRTCHNL2_RX_BASE_DESC_STATUS_EOF_M @@ -123,25 +123,16 @@ do { \ ((((txq)->next_to_clean > (txq)->next_to_use) ? 0 : (txq)->desc_count) + \ (txq)->next_to_clean - (txq)->next_to_use - 1) -#define IDPF_TX_BUF_RSV_UNUSED(txq) ((txq)->stash->buf_stack.top) -#define IDPF_TX_BUF_RSV_LOW(txq) (IDPF_TX_BUF_RSV_UNUSED(txq) < \ - (txq)->desc_count >> 2) - #define IDPF_TX_COMPLQ_OVERFLOW_THRESH(txcq) ((txcq)->desc_count >> 1) /* Determine the absolute number of completions pending, i.e. the number of * completions that are expected to arrive on the TX completion queue. */ #define IDPF_TX_COMPLQ_PENDING(txq) \ (((txq)->num_completions_pending >= (txq)->complq->num_completions ? \ - 0 : U64_MAX) + \ + 0 : U32_MAX) + \ (txq)->num_completions_pending - (txq)->complq->num_completions) -#define IDPF_TX_SPLITQ_COMPL_TAG_WIDTH 16 -#define IDPF_SPLITQ_TX_INVAL_COMPL_TAG -1 -/* Adjust the generation for the completion tag and wrap if necessary */ -#define IDPF_TX_ADJ_COMPL_TAG_GEN(txq) \ - ((++(txq)->compl_tag_cur_gen) >= (txq)->compl_tag_gen_max ? \ - 0 : (txq)->compl_tag_cur_gen) +#define IDPF_TXBUF_NULL U32_MAX #define IDPF_TXD_LAST_DESC_CMD (IDPF_TX_DESC_CMD_EOP | IDPF_TX_DESC_CMD_RS) @@ -155,59 +146,7 @@ union idpf_tx_flex_desc { struct idpf_flex_tx_sched_desc flow; /* flow based scheduling */ }; -/** - * struct idpf_tx_buf - * @next_to_watch: Next descriptor to clean - * @skb: Pointer to the skb - * @dma: DMA address - * @len: DMA length - * @bytecount: Number of bytes - * @gso_segs: Number of GSO segments - * @compl_tag: Splitq only, unique identifier for a buffer. Used to compare - * with completion tag returned in buffer completion event. - * Because the completion tag is expected to be the same in all - * data descriptors for a given packet, and a single packet can - * span multiple buffers, we need this field to track all - * buffers associated with this completion tag independently of - * the buf_id. The tag consists of a N bit buf_id and M upper - * order "generation bits". See compl_tag_bufid_m and - * compl_tag_gen_s in struct idpf_queue. We'll use a value of -1 - * to indicate the tag is not valid. - * @ctx_entry: Singleq only. Used to indicate the corresponding entry - * in the descriptor ring was used for a context descriptor and - * this buffer entry should be skipped. - */ -struct idpf_tx_buf { - void *next_to_watch; - struct sk_buff *skb; - DEFINE_DMA_UNMAP_ADDR(dma); - DEFINE_DMA_UNMAP_LEN(len); - unsigned int bytecount; - unsigned short gso_segs; - - union { - int compl_tag; - - bool ctx_entry; - }; -}; - -struct idpf_tx_stash { - struct hlist_node hlist; - struct idpf_tx_buf buf; -}; - -/** - * struct idpf_buf_lifo - LIFO for managing OOO completions - * @top: Used to know how many buffers are left - * @size: Total size of LIFO - * @bufs: Backing array - */ -struct idpf_buf_lifo { - u16 top; - u16 size; - struct idpf_tx_stash **bufs; -}; +#define idpf_tx_buf libeth_sqe /** * struct idpf_tx_offload_params - Offload parameters for a given packet @@ -241,6 +180,9 @@ struct idpf_tx_offload_params { * @compl_tag: Associated tag for completion * @td_tag: Descriptor tunneling tag * @offload: Offload parameters + * @prev_ntu: stored TxQ next_to_use in case of rollback + * @prev_refill_ntc: stored refillq next_to_clean in case of packet rollback + * @prev_refill_gen: stored refillq generation bit in case of packet rollback */ struct idpf_tx_splitq_params { enum idpf_tx_desc_dtype_value dtype; @@ -251,6 +193,10 @@ struct idpf_tx_splitq_params { }; struct idpf_tx_offload_params offload; + + u16 prev_ntu; + u16 prev_refill_ntc; + bool prev_refill_gen; }; enum idpf_tx_ctx_desc_eipt_offload { @@ -589,11 +535,6 @@ struct idpf_tx_queue_stats { u64_stats_t dma_map_errs; }; -struct idpf_cleaned_stats { - u32 packets; - u32 bytes; -}; - #define IDPF_ITR_DYNAMIC 1 #define IDPF_ITR_MAX 0x1FE0 #define IDPF_ITR_20K 0x0032 @@ -610,17 +551,6 @@ struct idpf_cleaned_stats { #define IDPF_ITR_IDX_SPACING(spacing, dflt) (spacing ? spacing : dflt) #define IDPF_DIM_DEFAULT_PROFILE_IX 1 -/** - * struct idpf_txq_stash - Tx buffer stash for Flow-based scheduling mode - * @buf_stack: Stack of empty buffers to store buffer info for out of order - * buffer completions. See struct idpf_buf_lifo - * @sched_buf_hash: Hash table to store buffers - */ -struct idpf_txq_stash { - struct idpf_buf_lifo buf_stack; - DECLARE_HASHTABLE(sched_buf_hash, 12); -} ____cacheline_aligned; - /** * struct idpf_rx_queue - software structure representing a receive queue * @rx: universal receive descriptor array @@ -718,6 +648,8 @@ struct idpf_rx_queue { * @desc_count: Number of descriptors * @next_to_use: Next descriptor to use * @next_to_clean: Next descriptor to clean + * @last_re: last descriptor index that RE bit was set + * @tx_max_bufs: Max buffers that can be transmitted with scatter-gather * @netdev: &net_device corresponding to this queue * @cleaned_bytes: Splitq only, TXQ only: When a TX completion is received on * the TX completion queue, it can be for any TXQ associated @@ -729,9 +661,8 @@ struct idpf_rx_queue { * only once at the end of the cleaning routine. * @clean_budget: singleq only, queue cleaning budget * @cleaned_pkts: Number of packets cleaned for the above said case - * @tx_max_bufs: Max buffers that can be transmitted with scatter-gather * @tx_min_pkt_len: Min supported packet length - * @compl_tag_bufid_m: Completion tag buffer id mask + * @refillq: Pointer to refill queue * @compl_tag_gen_s: Completion tag generation bit * The format of the completion tag will change based on the TXQ * descriptor ring size so that we can maintain roughly the same level @@ -752,15 +683,13 @@ struct idpf_rx_queue { * -------------------------------- * * This gives us 8*8160 = 65280 possible unique values. - * @compl_tag_cur_gen: Used to keep track of current completion tag generation - * @compl_tag_gen_max: To determine when compl_tag_cur_gen should be reset - * @stash: Tx buffer stash for Flow-based scheduling mode * @stats_sync: See struct u64_stats_sync * @q_stats: See union idpf_tx_queue_stats * @q_id: Queue id * @size: Length of descriptor ring in bytes * @dma: Physical address of ring * @q_vector: Backreference to associated vector + * @buf_pool_size: Total number of idpf_tx_buf */ struct idpf_tx_queue { union { @@ -771,7 +700,7 @@ struct idpf_tx_queue { void *desc_ring; }; - struct idpf_tx_buf *tx_buf; + struct libeth_sqe *tx_buf; struct idpf_txq_group *txq_grp; struct device *dev; void __iomem *tail; @@ -781,6 +710,8 @@ struct idpf_tx_queue { u16 desc_count; u16 next_to_use; u16 next_to_clean; + u16 last_re; + u16 tx_max_bufs; struct net_device *netdev; @@ -790,16 +721,8 @@ struct idpf_tx_queue { }; u16 cleaned_pkts; - u16 tx_max_bufs; u16 tx_min_pkt_len; - - u16 compl_tag_bufid_m; - u16 compl_tag_gen_s; - - u16 compl_tag_cur_gen; - u16 compl_tag_gen_max; - - struct idpf_txq_stash *stash; + struct idpf_sw_queue *refillq; struct u64_stats_sync stats_sync; struct idpf_tx_queue_stats q_stats; @@ -810,6 +733,7 @@ struct idpf_tx_queue { dma_addr_t dma; struct idpf_q_vector *q_vector; + u32 buf_pool_size; } ____cacheline_aligned; /** @@ -893,7 +817,7 @@ struct idpf_compl_queue { struct net_device *netdev; u32 clean_budget; - u32 num_completions; + aligned_u64 num_completions; /* Slowpath */ u32 q_id; @@ -995,7 +919,6 @@ struct idpf_rxq_group { * @vport: Vport back pointer * @num_txq: Number of TX queues associated * @txqs: Array of TX queue pointers - * @stashes: array of OOO stashes for the queues * @complq: Associated completion queue pointer, split queue only * @num_completions_pending: Total number of completions pending for the * completion queue, acculumated for all TX queues @@ -1010,11 +933,10 @@ struct idpf_txq_group { u16 num_txq; struct idpf_tx_queue *txqs[IDPF_LARGE_MAX_Q]; - struct idpf_txq_stash *stashes; struct idpf_compl_queue *complq; - u32 num_completions_pending; + aligned_u64 num_completions_pending; }; /** @@ -1143,6 +1065,17 @@ static inline void idpf_vport_intr_set_wb_on_itr(struct idpf_q_vector *q_vector) reg->dyn_ctl); } +/** + * idpf_tx_splitq_get_free_bufs - get number of free buf_ids in refillq + * @refillq: pointer to refillq containing buf_ids + */ +static inline u32 idpf_tx_splitq_get_free_bufs(struct idpf_sw_queue *refillq) +{ + return (refillq->next_to_use > refillq->next_to_clean ? + 0 : refillq->desc_count) + + refillq->next_to_use - refillq->next_to_clean - 1; +} + int idpf_vport_singleq_napi_poll(struct napi_struct *napi, int budget); void idpf_vport_init_num_qs(struct idpf_vport *vport, struct virtchnl2_create_vport *vport_msg); @@ -1173,10 +1106,8 @@ void idpf_tx_buf_hw_update(struct idpf_tx_queue *tx_q, u32 val, bool xmit_more); unsigned int idpf_size_to_txd_count(unsigned int size); netdev_tx_t idpf_tx_drop_skb(struct idpf_tx_queue *tx_q, struct sk_buff *skb); -void idpf_tx_dma_map_error(struct idpf_tx_queue *txq, struct sk_buff *skb, - struct idpf_tx_buf *first, u16 ring_idx); -unsigned int idpf_tx_desc_count_required(struct idpf_tx_queue *txq, - struct sk_buff *skb); +unsigned int idpf_tx_res_count_required(struct idpf_tx_queue *txq, + struct sk_buff *skb, u32 *buf_count); void idpf_tx_timeout(struct net_device *netdev, unsigned int txqueue); netdev_tx_t idpf_tx_singleq_frame(struct sk_buff *skb, struct idpf_tx_queue *tx_q); diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index cef072e7cfbbc..de45924a74c49 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3699,6 +3699,17 @@ static inline void netdev_tx_reset_queue(struct netdev_queue *q) #endif } +/** + * netdev_tx_reset_subqueue - reset the BQL stats and state of a netdev queue + * @dev: network device + * @qid: stack index of the queue to reset + */ +static inline void netdev_tx_reset_subqueue(const struct net_device *dev, + u32 qid) +{ + netdev_tx_reset_queue(netdev_get_tx_queue(dev, qid)); +} + /** * netdev_reset_queue - reset the packets and bytes count of a network device * @dev_queue: network device @@ -3708,7 +3719,7 @@ static inline void netdev_tx_reset_queue(struct netdev_queue *q) */ static inline void netdev_reset_queue(struct net_device *dev_queue) { - netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0)); + netdev_tx_reset_subqueue(dev_queue, 0); } /** diff --git a/include/net/libeth/tx.h b/include/net/libeth/tx.h new file mode 100644 index 0000000000000..35614f9523f60 --- /dev/null +++ b/include/net/libeth/tx.h @@ -0,0 +1,129 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright (C) 2024 Intel Corporation */ + +#ifndef __LIBETH_TX_H +#define __LIBETH_TX_H + +#include + +#include + +/* Tx buffer completion */ + +/** + * enum libeth_sqe_type - type of &libeth_sqe to act on Tx completion + * @LIBETH_SQE_EMPTY: unused/empty, no action required + * @LIBETH_SQE_CTX: context descriptor with empty SQE, no action required + * @LIBETH_SQE_SLAB: kmalloc-allocated buffer, unmap and kfree() + * @LIBETH_SQE_FRAG: mapped skb frag, only unmap DMA + * @LIBETH_SQE_SKB: &sk_buff, unmap and napi_consume_skb(), update stats + */ +enum libeth_sqe_type { + LIBETH_SQE_EMPTY = 0U, + LIBETH_SQE_CTX, + LIBETH_SQE_SLAB, + LIBETH_SQE_FRAG, + LIBETH_SQE_SKB, +}; + +/** + * struct libeth_sqe - represents a Send Queue Element / Tx buffer + * @type: type of the buffer, see the enum above + * @rs_idx: index of the last buffer from the batch this one was sent in + * @raw: slab buffer to free via kfree() + * @skb: &sk_buff to consume + * @dma: DMA address to unmap + * @len: length of the mapped region to unmap + * @nr_frags: number of frags in the frame this buffer belongs to + * @packets: number of physical packets sent for this frame + * @bytes: number of physical bytes sent for this frame + * @priv: driver-private scratchpad + */ +struct libeth_sqe { + enum libeth_sqe_type type:32; + u32 rs_idx; + + union { + void *raw; + struct sk_buff *skb; + }; + + DEFINE_DMA_UNMAP_ADDR(dma); + DEFINE_DMA_UNMAP_LEN(len); + + u32 nr_frags; + u32 packets; + u32 bytes; + + unsigned long priv; +} __aligned_largest; + +/** + * LIBETH_SQE_CHECK_PRIV - check the driver's private SQE data + * @p: type or name of the object the driver wants to fit into &libeth_sqe + * + * Make sure the driver's private data fits into libeth_sqe::priv. To be used + * right after its declaration. + */ +#define LIBETH_SQE_CHECK_PRIV(p) \ + static_assert(sizeof(p) <= sizeof_field(struct libeth_sqe, priv)) + +/** + * struct libeth_cq_pp - completion queue poll params + * @dev: &device to perform DMA unmapping + * @ss: onstack NAPI stats to fill + * @napi: whether it's called from the NAPI context + * + * libeth uses this structure to access objects needed for performing full + * Tx complete operation without passing lots of arguments and change the + * prototypes each time a new one is added. + */ +struct libeth_cq_pp { + struct device *dev; + struct libeth_sq_napi_stats *ss; + + bool napi; +}; + +/** + * libeth_tx_complete - perform Tx completion for one SQE + * @sqe: SQE to complete + * @cp: poll params + * + * Do Tx complete for all the types of buffers, incl. freeing, unmapping, + * updating the stats etc. + */ +static inline void libeth_tx_complete(struct libeth_sqe *sqe, + const struct libeth_cq_pp *cp) +{ + switch (sqe->type) { + case LIBETH_SQE_EMPTY: + return; + case LIBETH_SQE_SKB: + case LIBETH_SQE_FRAG: + case LIBETH_SQE_SLAB: + dma_unmap_page(cp->dev, dma_unmap_addr(sqe, dma), + dma_unmap_len(sqe, len), DMA_TO_DEVICE); + break; + default: + break; + } + + switch (sqe->type) { + case LIBETH_SQE_SKB: + cp->ss->packets += sqe->packets; + cp->ss->bytes += sqe->bytes; + + napi_consume_skb(sqe->skb, cp->napi); + break; + case LIBETH_SQE_SLAB: + kfree(sqe->raw); + break; + default: + break; + } + + sqe->type = LIBETH_SQE_EMPTY; +} + +#endif /* __LIBETH_TX_H */ diff --git a/include/net/libeth/types.h b/include/net/libeth/types.h new file mode 100644 index 0000000000000..603825e451339 --- /dev/null +++ b/include/net/libeth/types.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright (C) 2024 Intel Corporation */ + +#ifndef __LIBETH_TYPES_H +#define __LIBETH_TYPES_H + +#include + +/** + * struct libeth_sq_napi_stats - "hot" counters to update in Tx completion loop + * @packets: completed frames counter + * @bytes: sum of bytes of completed frames above + * @raw: alias to access all the fields as an array + */ +struct libeth_sq_napi_stats { + union { + struct { + u32 packets; + u32 bytes; + }; + DECLARE_FLEX_ARRAY(u32, raw); + }; +}; + +#endif /* __LIBETH_TYPES_H */