From: Nélio Laranjeiro Date: Tue, 20 Sep 2016 08:53:51 +0000 (+0200) Subject: net/mlx5: remove gather loop on segments X-Git-Tag: spdx-start~5840 X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=6579c27c11a5fb07b03cea837d51ed64ba73a763;p=dpdk.git net/mlx5: remove gather loop on segments Tx function was handling a double loop to send segmented packets, it can be done in a single one. Signed-off-by: Nelio Laranjeiro Signed-off-by: Vasily Philipov --- diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c index c941434da7..2a66d52ecb 100644 --- a/drivers/net/mlx5/mlx5_rxtx.c +++ b/drivers/net/mlx5/mlx5_rxtx.c @@ -287,112 +287,6 @@ txq_mp2mr(struct txq *txq, struct rte_mempool *mp) return lkey; } -/** - * Write a regular WQE. - * - * @param txq - * Pointer to TX queue structure. - * @param wqe - * Pointer to the WQE to fill. - * @param buf - * Buffer. - * @param length - * Packet length. - * - * @return ds - * Number of DS elements consumed. - */ -static inline unsigned int -mlx5_wqe_write(struct txq *txq, volatile struct mlx5_wqe *wqe, - struct rte_mbuf *buf, uint32_t length) -{ - uint8_t *raw = (uint8_t *)(uintptr_t)&wqe->eseg.inline_hdr[0]; - uint16_t ds; - uint16_t pkt_inline_sz = MLX5_WQE_DWORD_SIZE; - uintptr_t addr = rte_pktmbuf_mtod(buf, uintptr_t); - struct mlx5_wqe_data_seg *dseg = NULL; - - assert(length >= MLX5_WQE_DWORD_SIZE); - /* Start the know and common part of the WQE structure. */ - wqe->ctrl[0] = htonl((txq->wqe_ci << 8) | MLX5_OPCODE_SEND); - wqe->ctrl[2] = 0; - wqe->ctrl[3] = 0; - wqe->eseg.rsvd0 = 0; - wqe->eseg.rsvd1 = 0; - wqe->eseg.mss = 0; - wqe->eseg.rsvd2 = 0; - /* Start by copying the Ethernet Header. */ - rte_mov16((uint8_t *)raw, (uint8_t *)addr); - length -= MLX5_WQE_DWORD_SIZE; - addr += MLX5_WQE_DWORD_SIZE; - /* Replace the Ethernet type by the VLAN if necessary. */ - if (buf->ol_flags & PKT_TX_VLAN_PKT) { - uint32_t vlan = htonl(0x81000000 | buf->vlan_tci); - - memcpy((uint8_t *)(raw + MLX5_WQE_DWORD_SIZE - sizeof(vlan)), - &vlan, sizeof(vlan)); - addr -= sizeof(vlan); - length += sizeof(vlan); - } - /* Inline if enough room. */ - if (txq->max_inline != 0) { - uintptr_t end = (uintptr_t)&(*txq->wqes)[1 << txq->wqe_n]; - uint16_t max_inline = txq->max_inline * RTE_CACHE_LINE_SIZE; - uint16_t room; - - raw += MLX5_WQE_DWORD_SIZE; - room = end - (uintptr_t)raw; - if (room > max_inline) { - uintptr_t addr_end = (addr + max_inline) & - ~(RTE_CACHE_LINE_SIZE - 1); - uint16_t copy_b = ((addr_end - addr) > length) ? - length : - (addr_end - addr); - - rte_memcpy((void *)raw, (void *)addr, copy_b); - addr += copy_b; - length -= copy_b; - pkt_inline_sz += copy_b; - /* Sanity check. */ - assert(addr <= addr_end); - } - /* Store the inlined packet size in the WQE. */ - wqe->eseg.inline_hdr_sz = htons(pkt_inline_sz); - /* - * 2 DWORDs consumed by the WQE header + 1 DSEG + - * the size of the inline part of the packet. - */ - ds = 2 + MLX5_WQE_DS(pkt_inline_sz - 2); - if (length > 0) { - dseg = (struct mlx5_wqe_data_seg *) - ((uintptr_t)wqe + (ds * MLX5_WQE_DWORD_SIZE)); - if ((uintptr_t)dseg >= end) - dseg = (struct mlx5_wqe_data_seg *) - ((uintptr_t)&(*txq->wqes)[0]); - goto use_dseg; - } - } else { - /* Add the remaining packet as a simple ds. */ - ds = 3; - /* - * No inline has been done in the packet, only the Ethernet - * Header as been stored. - */ - wqe->eseg.inline_hdr_sz = htons(MLX5_WQE_DWORD_SIZE); - dseg = (struct mlx5_wqe_data_seg *) - ((uintptr_t)wqe + (ds * MLX5_WQE_DWORD_SIZE)); -use_dseg: - *dseg = (struct mlx5_wqe_data_seg) { - .addr = htonll(addr), - .byte_count = htonl(length), - .lkey = txq_mp2mr(txq, txq_mb2mp(buf)), - }; - ++ds; - } - wqe->ctrl[1] = htonl(txq->qp_num_8s | ds); - return ds; -} - /** * Ring TX queue doorbell. * @@ -475,6 +369,9 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n) unsigned int max; unsigned int comp; volatile struct mlx5_wqe *wqe = NULL; + unsigned int segs_n = 0; + struct rte_mbuf *buf = NULL; + uint8_t *raw; if (unlikely(!pkts_n)) return 0; @@ -488,13 +385,17 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n) if (max > elts_n) max -= elts_n; do { - struct rte_mbuf *buf = *(pkts++); - unsigned int elts_head_next; + volatile struct mlx5_wqe_data_seg *dseg = NULL; uint32_t length; - unsigned int segs_n = buf->nb_segs; - volatile struct mlx5_wqe_data_seg *dseg; unsigned int ds = 0; + uintptr_t addr; +#ifdef MLX5_PMD_SOFT_COUNTERS + uint32_t total_length = 0; +#endif + /* first_seg */ + buf = *(pkts++); + segs_n = buf->nb_segs; /* * Make sure there is enough room to store this packet and * that one ring entry remains unused. @@ -503,20 +404,30 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n) if (max < segs_n + 1) break; max -= segs_n; - --pkts_n; - elts_head_next = (elts_head + 1) & (elts_n - 1); - wqe = &(*txq->wqes)[txq->wqe_ci & ((1 << txq->wqe_n) - 1)].hdr; - tx_prefetch_wqe(txq, txq->wqe_ci); + --segs_n; + if (!segs_n) + --pkts_n; + wqe = &(*txq->wqes)[txq->wqe_ci & + ((1 << txq->wqe_n) - 1)].hdr; tx_prefetch_wqe(txq, txq->wqe_ci + 1); - if (pkts_n) + if (pkts_n > 1) rte_prefetch0(*pkts); + addr = rte_pktmbuf_mtod(buf, uintptr_t); length = DATA_LEN(buf); +#ifdef MLX5_PMD_SOFT_COUNTERS + total_length = length; +#endif + assert(length >= MLX5_WQE_DWORD_SIZE); /* Update element. */ (*txq->elts)[elts_head] = buf; + elts_head = (elts_head + 1) & (elts_n - 1); /* Prefetch next buffer data. */ - if (pkts_n) - rte_prefetch0(rte_pktmbuf_mtod(*pkts, - volatile void *)); + if (pkts_n > 1) { + volatile void *pkt_addr; + + pkt_addr = rte_pktmbuf_mtod(*pkts, volatile void *); + rte_prefetch0(pkt_addr); + } /* Should we enable HW CKSUM offload */ if (buf->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_TCP_CKSUM | PKT_TX_UDP_CKSUM)) { @@ -526,50 +437,143 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n) } else { wqe->eseg.cs_flags = 0; } - ds = mlx5_wqe_write(txq, wqe, buf, length); - if (segs_n == 1) - goto skip_segs; - dseg = (volatile struct mlx5_wqe_data_seg *) - (((uintptr_t)wqe) + ds * MLX5_WQE_DWORD_SIZE); - while (--segs_n) { + raw = (uint8_t *)(uintptr_t)&wqe->eseg.inline_hdr[0]; + /* Start the know and common part of the WQE structure. */ + wqe->ctrl[0] = htonl((txq->wqe_ci << 8) | MLX5_OPCODE_SEND); + wqe->ctrl[2] = 0; + wqe->ctrl[3] = 0; + wqe->eseg.rsvd0 = 0; + wqe->eseg.rsvd1 = 0; + wqe->eseg.mss = 0; + wqe->eseg.rsvd2 = 0; + /* Start by copying the Ethernet Header. */ + rte_mov16((uint8_t *)raw, (uint8_t *)addr); + length -= MLX5_WQE_DWORD_SIZE; + addr += MLX5_WQE_DWORD_SIZE; + /* Replace the Ethernet type by the VLAN if necessary. */ + if (buf->ol_flags & PKT_TX_VLAN_PKT) { + uint32_t vlan = htonl(0x81000000 | buf->vlan_tci); + + memcpy((uint8_t *)(raw + MLX5_WQE_DWORD_SIZE - + sizeof(vlan)), + &vlan, sizeof(vlan)); + addr -= sizeof(vlan); + length += sizeof(vlan); + } + /* Inline if enough room. */ + if (txq->max_inline != 0) { + uintptr_t end = + (uintptr_t)&(*txq->wqes)[1 << txq->wqe_n]; + uint16_t max_inline = + txq->max_inline * RTE_CACHE_LINE_SIZE; + uint16_t pkt_inline_sz = MLX5_WQE_DWORD_SIZE; + uint16_t room; + + raw += MLX5_WQE_DWORD_SIZE; + room = end - (uintptr_t)raw; + if (room > max_inline) { + uintptr_t addr_end = (addr + max_inline) & + ~(RTE_CACHE_LINE_SIZE - 1); + uint16_t copy_b = ((addr_end - addr) > length) ? + length : + (addr_end - addr); + + rte_memcpy((void *)raw, (void *)addr, copy_b); + addr += copy_b; + length -= copy_b; + pkt_inline_sz += copy_b; + /* Sanity check. */ + assert(addr <= addr_end); + } + /* Store the inlined packet size in the WQE. */ + wqe->eseg.inline_hdr_sz = htons(pkt_inline_sz); + /* + * 2 DWORDs consumed by the WQE header + 1 DSEG + + * the size of the inline part of the packet. + */ + ds = 2 + MLX5_WQE_DS(pkt_inline_sz - 2); + if (length > 0) { + dseg = (struct mlx5_wqe_data_seg *) + ((uintptr_t)wqe + + (ds * MLX5_WQE_DWORD_SIZE)); + if ((uintptr_t)dseg >= end) + dseg = (struct mlx5_wqe_data_seg *) + ((uintptr_t)&(*txq->wqes)[0]); + goto use_dseg; + } else if (!segs_n) { + goto next_pkt; + } else { + goto next_seg; + } + } else { /* - * Spill on next WQE when the current one does not have - * enough room left. Size of WQE must a be a multiple - * of data segment size. + * No inline has been done in the packet, only the + * Ethernet Header as been stored. */ - assert(!(MLX5_WQE_SIZE % MLX5_WQE_DWORD_SIZE)); - if (!(ds % (MLX5_WQE_SIZE / MLX5_WQE_DWORD_SIZE))) - dseg = (volatile void *) - &(*txq->wqes)[txq->wqe_ci++ & - ((1 << txq->wqe_n) - 1)]; - else - ++dseg; + wqe->eseg.inline_hdr_sz = htons(MLX5_WQE_DWORD_SIZE); + dseg = (struct mlx5_wqe_data_seg *) + ((uintptr_t)wqe + (3 * MLX5_WQE_DWORD_SIZE)); + ds = 3; +use_dseg: + /* Add the remaining packet as a simple ds. */ + *dseg = (struct mlx5_wqe_data_seg) { + .addr = htonll(addr), + .byte_count = htonl(length), + .lkey = txq_mp2mr(txq, txq_mb2mp(buf)), + }; ++ds; - buf = buf->next; - assert(buf); - /* Store segment information. */ - dseg->byte_count = htonl(DATA_LEN(buf)); - dseg->lkey = txq_mp2mr(txq, txq_mb2mp(buf)); - dseg->addr = htonll(rte_pktmbuf_mtod(buf, uintptr_t)); - (*txq->elts)[elts_head_next] = buf; - elts_head_next = (elts_head_next + 1) & (elts_n - 1); + if (!segs_n) + goto next_pkt; + } +next_seg: + assert(buf); + assert(ds); + assert(wqe); + /* + * Spill on next WQE when the current one does not have + * enough room left. Size of WQE must a be a multiple + * of data segment size. + */ + assert(!(MLX5_WQE_SIZE % MLX5_WQE_DWORD_SIZE)); + if (!(ds % (MLX5_WQE_SIZE / MLX5_WQE_DWORD_SIZE))) { + unsigned int n = (txq->wqe_ci + ((ds + 3) / 4)) & + ((1 << txq->wqe_n) - 1); + + dseg = (struct mlx5_wqe_data_seg *) + ((uintptr_t)&(*txq->wqes)[n]); + tx_prefetch_wqe(txq, n + 1); + } else { + ++dseg; + } + ++ds; + buf = buf->next; + assert(buf); + length = DATA_LEN(buf); #ifdef MLX5_PMD_SOFT_COUNTERS - length += DATA_LEN(buf); + total_length += length; #endif - ++j; - } - /* Update DS field in WQE. */ - wqe->ctrl[1] &= htonl(0xffffffc0); - wqe->ctrl[1] |= htonl(ds & 0x3f); -skip_segs: + /* Store segment information. */ + *dseg = (struct mlx5_wqe_data_seg) { + .addr = htonll(rte_pktmbuf_mtod(buf, uintptr_t)), + .byte_count = htonl(length), + .lkey = txq_mp2mr(txq, txq_mb2mp(buf)), + }; + (*txq->elts)[elts_head] = buf; + elts_head = (elts_head + 1) & (elts_n - 1); + ++j; + --segs_n; + if (segs_n) + goto next_seg; + else + --pkts_n; +next_pkt: + ++i; + wqe->ctrl[1] = htonl(txq->qp_num_8s | ds); + txq->wqe_ci += (ds + 3) / 4; #ifdef MLX5_PMD_SOFT_COUNTERS /* Increment sent bytes counter. */ - txq->stats.obytes += length; + txq->stats.obytes += total_length; #endif - /* Increment consumer index. */ - txq->wqe_ci += (ds + 3) / 4; - elts_head = elts_head_next; - ++i; } while (pkts_n); /* Take a shortcut if nothing must be sent. */ if (unlikely(i == 0))