From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 838FCA00C4; Fri, 1 Jul 2022 12:28:45 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 905A742670; Fri, 1 Jul 2022 12:28:43 +0200 (CEST) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mails.dpdk.org (Postfix) with ESMTP id 685B041133 for ; Fri, 1 Jul 2022 12:28:42 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 325141424; Fri, 1 Jul 2022 03:28:42 -0700 (PDT) Received: from net-arm-n1amp-02.shanghai.arm.com (net-arm-n1amp-02.shanghai.arm.com [10.169.210.136]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 44B403F66F; Fri, 1 Jul 2022 03:28:38 -0700 (PDT) From: Joyce Kong To: Jakub Grajciar Cc: dev@dpdk.org, nd@arm.com, Joyce Kong , Ruifeng Wang , =?UTF-8?q?Morten=20Br=C3=B8rup?= Subject: [PATCH v2 1/2] net/memif: add a Rx fast path Date: Fri, 1 Jul 2022 10:28:14 +0000 Message-Id: <20220701102815.1444223-2-joyce.kong@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220701102815.1444223-1-joyce.kong@arm.com> References: <20220517105109.1086090-1-joyce.kong@arm.com> <20220701102815.1444223-1-joyce.kong@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org For memif non-zero-copy mode, there is a branch to compare the mbuf and memif buffer size during memory copying. Add a fast memory copy path by removing this branch with mbuf and memif buffer size defined at compile time. The removal of the branch leads to considerable performance uplift. The Rx fast path would not change mbuf's behavior of storing memif buf. When memif <= buffer size, Rx chooses the fast memcpy path, otherwise it would choose the original path. Test with 1p1q on Ampere Altra AArch64 server, ---------------------------------------------- | buf size | memif <= mbuf | memif > mbuf | ---------------------------------------------- | non-zc gain | 4.30% | -0.52% | ---------------------------------------------- | zc gain | 2.46% | 0.70% | ---------------------------------------------- Test with 1p1q on Cascade Lake Xeon X86server, ---------------------------------------------- | buf size | memif <= mbuf | memif > mbuf | ---------------------------------------------- | non-zc gain | 2.13% | -1.40% | ---------------------------------------------- | zc gain | 0.18% | 0.48% | ---------------------------------------------- Signed-off-by: Joyce Kong Reviewed-by: Ruifeng Wang Acked-by: Morten Brørup --- drivers/net/memif/rte_eth_memif.c | 123 ++++++++++++++++++++---------- 1 file changed, 83 insertions(+), 40 deletions(-) diff --git a/drivers/net/memif/rte_eth_memif.c b/drivers/net/memif/rte_eth_memif.c index dd951b8296..24fc8b13fa 100644 --- a/drivers/net/memif/rte_eth_memif.c +++ b/drivers/net/memif/rte_eth_memif.c @@ -341,67 +341,111 @@ eth_memif_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) if (cur_slot == last_slot) goto refill; n_slots = last_slot - cur_slot; + if (likely(mbuf_size >= pmd->cfg.pkt_buffer_size)) { + while (n_slots && n_rx_pkts < nb_pkts) { + mbuf_head = rte_pktmbuf_alloc(mq->mempool); + if (unlikely(mbuf_head == NULL)) + goto no_free_bufs; + mbuf = mbuf_head; + +next_slot1: + mbuf->port = mq->in_port; + s0 = cur_slot & mask; + d0 = &ring->desc[s0]; - while (n_slots && n_rx_pkts < nb_pkts) { - mbuf_head = rte_pktmbuf_alloc(mq->mempool); - if (unlikely(mbuf_head == NULL)) - goto no_free_bufs; - mbuf = mbuf_head; - mbuf->port = mq->in_port; - dst_off = 0; + cp_len = d0->length; -next_slot: - s0 = cur_slot & mask; - d0 = &ring->desc[s0]; + rte_pktmbuf_data_len(mbuf) = cp_len; + rte_pktmbuf_pkt_len(mbuf) = cp_len; + if (mbuf != mbuf_head) + rte_pktmbuf_pkt_len(mbuf_head) += cp_len; - src_len = d0->length; - src_off = 0; + rte_memcpy(rte_pktmbuf_mtod(mbuf, void *), + (uint8_t *)memif_get_buffer(proc_private, d0), cp_len); - do { - dst_len = mbuf_size - dst_off; - if (dst_len == 0) { - dst_off = 0; - dst_len = mbuf_size; + cur_slot++; + n_slots--; - /* store pointer to tail */ + if (d0->flags & MEMIF_DESC_FLAG_NEXT) { mbuf_tail = mbuf; mbuf = rte_pktmbuf_alloc(mq->mempool); if (unlikely(mbuf == NULL)) goto no_free_bufs; - mbuf->port = mq->in_port; ret = memif_pktmbuf_chain(mbuf_head, mbuf_tail, mbuf); if (unlikely(ret < 0)) { MIF_LOG(ERR, "number-of-segments-overflow"); rte_pktmbuf_free(mbuf); goto no_free_bufs; } + goto next_slot1; } - cp_len = RTE_MIN(dst_len, src_len); - rte_pktmbuf_data_len(mbuf) += cp_len; - rte_pktmbuf_pkt_len(mbuf) = rte_pktmbuf_data_len(mbuf); - if (mbuf != mbuf_head) - rte_pktmbuf_pkt_len(mbuf_head) += cp_len; + mq->n_bytes += rte_pktmbuf_pkt_len(mbuf_head); + *bufs++ = mbuf_head; + n_rx_pkts++; + } + } else { + while (n_slots && n_rx_pkts < nb_pkts) { + mbuf_head = rte_pktmbuf_alloc(mq->mempool); + if (unlikely(mbuf_head == NULL)) + goto no_free_bufs; + mbuf = mbuf_head; + mbuf->port = mq->in_port; + +next_slot2: + s0 = cur_slot & mask; + d0 = &ring->desc[s0]; - rte_memcpy(rte_pktmbuf_mtod_offset(mbuf, void *, - dst_off), - (uint8_t *)memif_get_buffer(proc_private, d0) + - src_off, cp_len); + src_len = d0->length; + dst_off = 0; + src_off = 0; - src_off += cp_len; - dst_off += cp_len; - src_len -= cp_len; - } while (src_len); + do { + dst_len = mbuf_size - dst_off; + if (dst_len == 0) { + dst_off = 0; + dst_len = mbuf_size; + + /* store pointer to tail */ + mbuf_tail = mbuf; + mbuf = rte_pktmbuf_alloc(mq->mempool); + if (unlikely(mbuf == NULL)) + goto no_free_bufs; + mbuf->port = mq->in_port; + ret = memif_pktmbuf_chain(mbuf_head, mbuf_tail, mbuf); + if (unlikely(ret < 0)) { + MIF_LOG(ERR, "number-of-segments-overflow"); + rte_pktmbuf_free(mbuf); + goto no_free_bufs; + } + } + cp_len = RTE_MIN(dst_len, src_len); - cur_slot++; - n_slots--; + rte_pktmbuf_data_len(mbuf) += cp_len; + rte_pktmbuf_pkt_len(mbuf) = rte_pktmbuf_data_len(mbuf); + if (mbuf != mbuf_head) + rte_pktmbuf_pkt_len(mbuf_head) += cp_len; - if (d0->flags & MEMIF_DESC_FLAG_NEXT) - goto next_slot; + rte_memcpy(rte_pktmbuf_mtod_offset(mbuf, void *, + dst_off), + (uint8_t *)memif_get_buffer(proc_private, d0) + + src_off, cp_len); - mq->n_bytes += rte_pktmbuf_pkt_len(mbuf_head); - *bufs++ = mbuf_head; - n_rx_pkts++; + src_off += cp_len; + dst_off += cp_len; + src_len -= cp_len; + } while (src_len); + + cur_slot++; + n_slots--; + + if (d0->flags & MEMIF_DESC_FLAG_NEXT) + goto next_slot2; + + mq->n_bytes += rte_pktmbuf_pkt_len(mbuf_head); + *bufs++ = mbuf_head; + n_rx_pkts++; + } } no_free_bufs: @@ -694,7 +738,6 @@ eth_memif_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) return n_tx_pkts; } - static int memif_tx_one_zc(struct pmd_process_private *proc_private, struct memif_queue *mq, memif_ring_t *ring, struct rte_mbuf *mbuf, const uint16_t mask, -- 2.25.1