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 C6984A0542; Fri, 7 Feb 2020 18:02:33 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id A83B71C11B; Fri, 7 Feb 2020 18:02:33 +0100 (CET) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by dpdk.org (Postfix) with ESMTP id B7D2A1C0D8; Fri, 7 Feb 2020 18:02:31 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Feb 2020 09:02:19 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,414,1574150400"; d="scan'208";a="232426620" Received: from silpixa00373417.ir.intel.com (HELO silpixa00373417.ger.corp.intel.com) ([10.237.223.96]) by orsmga003.jf.intel.com with ESMTP; 07 Feb 2020 09:02:18 -0800 From: Ciara Loftus To: dev@dpdk.org Cc: Ciara Loftus , stable@dpdk.org Date: Fri, 7 Feb 2020 17:03:28 +0000 Message-Id: <20200207170328.25705-1-ciara.loftus@intel.com> X-Mailer: git-send-email 2.17.1 Subject: [dpdk-dev] [PATCH v2 3/3] net/af_xdp: fix maximum MTU value 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 maximum MTU for af_xdp zero copy is equal to the page size less the frame overhead introduced by AF_XDP (XDP HR = 256) and DPDK (frame headroom = 320). The patch updates this value to reflect this. This change also makes it possible to remove unneeded constants for both zero-copy and copy mode. Fixes: d8a210774e1d ("net/af_xdp: support unaligned umem chunks") Cc: stable@dpdk.org Signed-off-by: Ciara Loftus --- drivers/net/af_xdp/rte_eth_af_xdp.c | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-) diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c index 1e98cd44f..75f037c3e 100644 --- a/drivers/net/af_xdp/rte_eth_af_xdp.c +++ b/drivers/net/af_xdp/rte_eth_af_xdp.c @@ -59,13 +59,6 @@ static int af_xdp_logtype; #define ETH_AF_XDP_FRAME_SIZE 2048 #define ETH_AF_XDP_NUM_BUFFERS 4096 -#ifdef XDP_UMEM_UNALIGNED_CHUNK_FLAG -#define ETH_AF_XDP_MBUF_OVERHEAD 128 /* sizeof(struct rte_mbuf) */ -#define ETH_AF_XDP_DATA_HEADROOM \ - (ETH_AF_XDP_MBUF_OVERHEAD + RTE_PKTMBUF_HEADROOM) -#else -#define ETH_AF_XDP_DATA_HEADROOM 0 -#endif #define ETH_AF_XDP_DFLT_NUM_DESCS XSK_RING_CONS__DEFAULT_NUM_DESCS #define ETH_AF_XDP_DFLT_START_QUEUE_IDX 0 #define ETH_AF_XDP_DFLT_QUEUE_COUNT 1 @@ -602,7 +595,14 @@ eth_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info) dev_info->max_tx_queues = internals->queue_cnt; dev_info->min_mtu = RTE_ETHER_MIN_MTU; - dev_info->max_mtu = ETH_AF_XDP_FRAME_SIZE - ETH_AF_XDP_DATA_HEADROOM; +#if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG) + dev_info->max_mtu = getpagesize() - + sizeof(struct rte_mempool_objhdr) - + sizeof(struct rte_mbuf) - + RTE_PKTMBUF_HEADROOM - XDP_PACKET_HEADROOM; +#else + dev_info->max_mtu = ETH_AF_XDP_FRAME_SIZE; +#endif dev_info->default_rxportconf.nb_queues = 1; dev_info->default_txportconf.nb_queues = 1; @@ -804,7 +804,7 @@ xsk_umem_info *xdp_umem_configure(struct pmd_internals *internals, .fill_size = ETH_AF_XDP_DFLT_NUM_DESCS, .comp_size = ETH_AF_XDP_DFLT_NUM_DESCS, .frame_size = ETH_AF_XDP_FRAME_SIZE, - .frame_headroom = ETH_AF_XDP_DATA_HEADROOM }; + .frame_headroom = 0 }; char ring_name[RTE_RING_NAMESIZE]; char mz_name[RTE_MEMZONE_NAMESIZE]; int ret; @@ -829,8 +829,7 @@ xsk_umem_info *xdp_umem_configure(struct pmd_internals *internals, for (i = 0; i < ETH_AF_XDP_NUM_BUFFERS; i++) rte_ring_enqueue(umem->buf_ring, - (void *)(i * ETH_AF_XDP_FRAME_SIZE + - ETH_AF_XDP_DATA_HEADROOM)); + (void *)(i * ETH_AF_XDP_FRAME_SIZE)); snprintf(mz_name, sizeof(mz_name), "af_xdp_umem_%s_%u", internals->if_name, rxq->xsk_queue_idx); @@ -939,7 +938,7 @@ eth_rx_queue_setup(struct rte_eth_dev *dev, /* Now get the space available for data in the mbuf */ buf_size = rte_pktmbuf_data_room_size(mb_pool) - RTE_PKTMBUF_HEADROOM; - data_size = ETH_AF_XDP_FRAME_SIZE - ETH_AF_XDP_DATA_HEADROOM; + data_size = ETH_AF_XDP_FRAME_SIZE; if (data_size > buf_size) { AF_XDP_LOG(ERR, "%s: %d bytes will not fit in mbuf (%d bytes)\n", -- 2.17.1