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[204.195.123.141]) by smtp.gmail.com with ESMTPSA id c7-20020a170902d48700b001db5079b705sm1782396plg.36.2024.02.29.09.56.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Feb 2024 09:56:30 -0800 (PST) From: Stephen Hemminger To: dev@dpdk.org Cc: Stephen Hemminger Subject: [PATCH] net/tap: allow more that 4 queues Date: Thu, 29 Feb 2024 09:56:18 -0800 Message-ID: <20240229175620.122949-1-stephen@networkplumber.org> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 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 The tap device needs to exchange file descriptors for tx and rx. But the EAL MP layer has limit of 8 file descriptors per message. The ideal resolution would be to increase the number of file descriptors allowed for rte_mp_sendmsg(), but this would break the ABI. Workaround the constraint by breaking into multiple messages. Do not hide errors about MP message failures. Signed-off-by: Stephen Hemminger --- drivers/net/tap/rte_eth_tap.c | 40 +++++++++++++++++++++++++++++------ 1 file changed, 33 insertions(+), 7 deletions(-) diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c index 69d9da695bed..df18c328f498 100644 --- a/drivers/net/tap/rte_eth_tap.c +++ b/drivers/net/tap/rte_eth_tap.c @@ -863,21 +863,44 @@ tap_mp_req_on_rxtx(struct rte_eth_dev *dev) msg.fds[fd_iterator++] = process_private->txq_fds[i]; msg.num_fds++; request_param->txq_count++; + + /* Need to break request into chunks */ + if (fd_iterator >= RTE_MP_MAX_FD_NUM) { + err = rte_mp_sendmsg(&msg); + if (err < 0) + goto fail; + + fd_iterator = 0; + msg.num_fds = 0; + request_param->txq_count = 0; + } } for (i = 0; i < dev->data->nb_rx_queues; i++) { msg.fds[fd_iterator++] = process_private->rxq_fds[i]; msg.num_fds++; request_param->rxq_count++; + + if (fd_iterator >= RTE_MP_MAX_FD_NUM) { + err = rte_mp_sendmsg(&msg); + if (err < 0) + goto fail; + + fd_iterator = 0; + msg.num_fds = 0; + request_param->rxq_count = 0; + } } - err = rte_mp_sendmsg(&msg); - if (err < 0) { - TAP_LOG(ERR, "Failed to send start req to secondary %d", - rte_errno); - return -1; + if (msg.num_fds > 0) { + err = rte_mp_sendmsg(&msg); + if (err < 0) + goto fail; } return 0; +fail: + TAP_LOG(ERR, "Failed to send start req to secondary %d", rte_errno); + return err; } static int @@ -885,8 +908,11 @@ tap_dev_start(struct rte_eth_dev *dev) { int err, i; - if (rte_eal_process_type() == RTE_PROC_PRIMARY) - tap_mp_req_on_rxtx(dev); + if (rte_eal_process_type() == RTE_PROC_PRIMARY) { + err = tap_mp_req_on_rxtx(dev); + if (err) + return err; + } err = tap_intr_handle_set(dev, 1); if (err) -- 2.43.0