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 694F5A00C4; Sun, 24 Apr 2022 08:13:53 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 2E9DC427F4; Sun, 24 Apr 2022 08:13:40 +0200 (CEST) Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by mails.dpdk.org (Postfix) with ESMTP id 2DCC44069D for ; Sun, 24 Apr 2022 08:13:34 +0200 (CEST) Received: from dggpeml500024.china.huawei.com (unknown [172.30.72.53]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4KmHrf1m8wzhYF2; Sun, 24 Apr 2022 14:13:22 +0800 (CST) Received: from localhost.localdomain (10.67.165.24) by dggpeml500024.china.huawei.com (7.185.36.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Sun, 24 Apr 2022 14:13:32 +0800 From: Chengwen Feng To: , , , CC: Subject: [PATCH v3 1/3] examples/dma: fix MTU configuration Date: Sun, 24 Apr 2022 14:07:39 +0800 Message-ID: <20220424060741.33214-2-fengchengwen@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20220424060741.33214-1-fengchengwen@huawei.com> References: <20220411025634.33032-1-fengchengwen@huawei.com> <20220424060741.33214-1-fengchengwen@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.67.165.24] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggpeml500024.china.huawei.com (7.185.36.10) X-CFilter-Loop: Reflected 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 From: Huisong Li The MTU in dma App can be configured by 'max_frame_size' parameters which have a default value(1518). It's not reasonable to use it directly as MTU. This patch fix it. Fixes: 1bb4a528c41f ("ethdev: fix max Rx packet length") Cc: stable@dpdk.org Signed-off-by: Huisong Li --- examples/dma/dmafwd.c | 43 +++++++++++++++++++++++++++++++++++++++---- 1 file changed, 39 insertions(+), 4 deletions(-) diff --git a/examples/dma/dmafwd.c b/examples/dma/dmafwd.c index 608487e35c..a03ca05129 100644 --- a/examples/dma/dmafwd.c +++ b/examples/dma/dmafwd.c @@ -117,7 +117,7 @@ static uint16_t nb_txd = TX_DEFAULT_RINGSIZE; static volatile bool force_quit; static uint32_t dma_batch_sz = MAX_PKT_BURST; -static uint32_t max_frame_size = RTE_ETHER_MAX_LEN; +static uint32_t max_frame_size; /* ethernet addresses of ports */ static struct rte_ether_addr dma_ports_eth_addr[RTE_MAX_ETHPORTS]; @@ -851,6 +851,38 @@ assign_rings(void) } /* >8 End of assigning ring structures for packet exchanging. */ +static uint32_t +eth_dev_get_overhead_len(uint32_t max_rx_pktlen, uint16_t max_mtu) +{ + uint32_t overhead_len; + + if (max_mtu != UINT16_MAX && max_rx_pktlen > max_mtu) + overhead_len = max_rx_pktlen - max_mtu; + else + overhead_len = RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN; + + return overhead_len; +} + +static int +config_port_max_pkt_len(struct rte_eth_conf *conf, + struct rte_eth_dev_info *dev_info) +{ + uint32_t overhead_len; + + if (max_frame_size == 0) + return 0; + + if (max_frame_size < RTE_ETHER_MIN_LEN) + return -1; + + overhead_len = eth_dev_get_overhead_len(dev_info->max_rx_pktlen, + dev_info->max_mtu); + conf->rxmode.mtu = max_frame_size - overhead_len; + + return 0; +} + /* * Initializes a given port using global settings and with the RX buffers * coming from the mbuf_pool passed as a parameter. @@ -878,9 +910,6 @@ port_init(uint16_t portid, struct rte_mempool *mbuf_pool, uint16_t nb_queues) struct rte_eth_dev_info dev_info; int ret, i; - if (max_frame_size > local_port_conf.rxmode.mtu) - local_port_conf.rxmode.mtu = max_frame_size; - /* Skip ports that are not enabled */ if ((dma_enabled_port_mask & (1 << portid)) == 0) { printf("Skipping disabled port %u\n", portid); @@ -895,6 +924,12 @@ port_init(uint16_t portid, struct rte_mempool *mbuf_pool, uint16_t nb_queues) rte_exit(EXIT_FAILURE, "Cannot get device info: %s, port=%u\n", rte_strerror(-ret), portid); + ret = config_port_max_pkt_len(&local_port_conf, &dev_info); + if (ret != 0) + rte_exit(EXIT_FAILURE, + "Invalid max frame size: %u (port %u)\n", + max_frame_size, portid); + local_port_conf.rx_adv_conf.rss_conf.rss_hf &= dev_info.flow_type_rss_offloads; ret = rte_eth_dev_configure(portid, nb_queues, 1, &local_port_conf); -- 2.33.0