From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id A2F90A0562; Tue, 31 Mar 2020 23:53:24 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 0921E1C1DA; Tue, 31 Mar 2020 23:52:55 +0200 (CEST) Received: from mellanox.co.il (mail-il-dmz.mellanox.com [193.47.165.129]) by dpdk.org (Postfix) with ESMTP id BBBB21C1B7 for ; Tue, 31 Mar 2020 23:52:51 +0200 (CEST) Received: from Internal Mail-Server by MTLPINE1 (envelope-from akozyrev@mellanox.com) with ESMTPS (AES256-SHA encrypted); 1 Apr 2020 00:52:45 +0300 Received: from pegasus02.mtr.labs.mlnx. (pegasus02.mtr.labs.mlnx [10.210.16.122]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id 02VLqjEM014122; Wed, 1 Apr 2020 00:52:45 +0300 From: Alexander Kozyrev To: dev@dpdk.org Cc: rasland@mellanox.com, matan@mellanox.com, viacheslavo@mellanox.com, ferruh.yigit@intel.com, thomas@monjalon.net Date: Tue, 31 Mar 2020 21:52:39 +0000 Message-Id: <1585691559-17409-5-git-send-email-akozyrev@mellanox.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1585691559-17409-1-git-send-email-akozyrev@mellanox.com> References: <1585691559-17409-1-git-send-email-akozyrev@mellanox.com> Subject: [dpdk-dev] [PATCH 4/4] net/mlx5: add multi-segment packets in MPRQ mode X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" The multi-stride operations now allow to reduce a stride size while supporting Jumbo frames. That means that it is possible to have mbufs configured with a size smaller than the whole packet received. It is not an issue during normal MPRQ operations since we attach external buffers instead of copying the data into the mbuf itself. But it is not the case in "emergency mode" when we have to copy every packet because of no more external mbufs are available. Assemble a multi-segment packet to overcome this issue in case scatter mode is enabled, drop a packet if not. Signed-off-by: Alexander Kozyrev --- drivers/net/mlx5/mlx5_rxtx.c | 47 ++++++++++++++++++++++++++++++++++++-------- 1 file changed, 39 insertions(+), 8 deletions(-) diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c index 4c27952..7ce3732 100644 --- a/drivers/net/mlx5/mlx5_rxtx.c +++ b/drivers/net/mlx5/mlx5_rxtx.c @@ -1734,22 +1734,52 @@ enum mlx5_txcmp_code { * Memcpy packets to the target mbuf if: * - The size of packet is smaller than mprq_max_memcpy_len. * - Out of buffer in the Mempool for Multi-Packet RQ. - * - There is no space for a headroom and scatter is disabled. + * - The packet's stride overlaps a headroom and scatter is off. */ if (len <= rxq->mprq_max_memcpy_len || rxq->mprq_repl == NULL || (hdrm_overlap > 0 && !rxq->strd_scatter_en)) { - /* - * When memcpy'ing packet due to out-of-buffer, the - * packet must be smaller than the target mbuf. - */ - if (unlikely(rte_pktmbuf_tailroom(pkt) < len)) { + if (likely(rte_pktmbuf_tailroom(pkt) >= len)) { + rte_memcpy(rte_pktmbuf_mtod(pkt, void *), + addr, len); + DATA_LEN(pkt) = len; + } else if (rxq->strd_scatter_en) { + struct rte_mbuf *prev = pkt; + uint32_t seg_len = + RTE_MIN(rte_pktmbuf_tailroom(pkt), len); + uint32_t rem_len = len - seg_len; + + rte_memcpy(rte_pktmbuf_mtod(pkt, void *), + addr, seg_len); + DATA_LEN(pkt) = seg_len; + while (rem_len) { + struct rte_mbuf *next = + rte_pktmbuf_alloc(rxq->mp); + + if (unlikely(next == NULL)) { + rte_pktmbuf_free(pkt); + ++rxq->stats.rx_nombuf; + goto out; + } + NEXT(prev) = next; + SET_DATA_OFF(next, 0); + addr = RTE_PTR_ADD(addr, seg_len); + seg_len = RTE_MIN + (rte_pktmbuf_tailroom(next), + rem_len); + rte_memcpy + (rte_pktmbuf_mtod(next, void *), + addr, seg_len); + DATA_LEN(next) = seg_len; + rem_len -= seg_len; + prev = next; + ++NB_SEGS(pkt); + } + } else { rte_pktmbuf_free_seg(pkt); ++rxq->stats.idropped; continue; } - rte_memcpy(rte_pktmbuf_mtod(pkt, void *), addr, len); - DATA_LEN(pkt) = len; } else { rte_iova_t buf_iova; struct rte_mbuf_ext_shared_info *shinfo; @@ -1826,6 +1856,7 @@ enum mlx5_txcmp_code { *(pkts++) = pkt; ++i; } +out: /* Update the consumer indexes. */ rxq->consumed_strd = consumed_strd; rte_cio_wmb(); -- 1.8.3.1