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[204.195.96.226]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4362972fc26sm26448426f8f.22.2026.02.09.10.40.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Feb 2026 10:40:59 -0800 (PST) From: Stephen Hemminger To: dev@dpdk.org Cc: Stephen Hemminger Subject: [PATCH v5 06/10] net/rtap: add checksum and TSO offload support Date: Mon, 9 Feb 2026 10:39:05 -0800 Message-ID: <20260209184045.132774-7-stephen@networkplumber.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260209184045.132774-1-stephen@networkplumber.org> References: <20241210212757.83490-1-stephen@networkplumber.org> <20260209184045.132774-1-stephen@networkplumber.org> 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 Add transmit and receive offload support using the virtio-net header that is exchanged with the kernel TAP device. Tx offloads: - UDP and TCP checksum offload: set VIRTIO_NET_HDR_F_NEEDS_CSUM with appropriate csum_start and csum_offset fields - TCP segmentation offload (TSO): set gso_type and gso_size Rx offloads: - Parse virtio-net header flags to determine checksum status - Handle NEEDS_CSUM by either marking L4_CKSUM_NONE for known protocols or computing the checksum in software for tunnels - Handle DATA_VALID flag to mark L4_CKSUM_GOOD - Parse GSO headers to populate LRO metadata Configure kernel-side offloads via TUNSETOFFLOAD in dev_configure based on the requested rx offload flags. Report offload capabilities in dev_info. Signed-off-by: Stephen Hemminger --- doc/guides/nics/features/rtap.ini | 2 ++ drivers/net/rtap/rtap_ethdev.c | 30 +++++++++++++++++++++++++++++- 2 files changed, 31 insertions(+), 1 deletion(-) diff --git a/doc/guides/nics/features/rtap.ini b/doc/guides/nics/features/rtap.ini index ce0804d795..b8eaa805fe 100644 --- a/doc/guides/nics/features/rtap.ini +++ b/doc/guides/nics/features/rtap.ini @@ -11,6 +11,8 @@ Allmulticast mode = Y Scattered Rx = P Basic stats = Y Stats per queue = Y +TSO = Y +L4 checksum offload = Y Linux = Y ARMv7 = Y ARMv8 = Y diff --git a/drivers/net/rtap/rtap_ethdev.c b/drivers/net/rtap/rtap_ethdev.c index 591fe91eac..277a280772 100644 --- a/drivers/net/rtap/rtap_ethdev.c +++ b/drivers/net/rtap/rtap_ethdev.c @@ -31,6 +31,16 @@ #define RTAP_DEFAULT_IFNAME "rtap%d" +#define RTAP_TX_OFFLOAD (RTE_ETH_TX_OFFLOAD_MULTI_SEGS | \ + RTE_ETH_TX_OFFLOAD_UDP_CKSUM | \ + RTE_ETH_TX_OFFLOAD_TCP_CKSUM | \ + RTE_ETH_TX_OFFLOAD_TCP_TSO) + +#define RTAP_RX_OFFLOAD (RTE_ETH_RX_OFFLOAD_UDP_CKSUM | \ + RTE_ETH_RX_OFFLOAD_TCP_CKSUM | \ + RTE_ETH_RX_OFFLOAD_TCP_LRO | \ + RTE_ETH_RX_OFFLOAD_SCATTER) + #define RTAP_DEFAULT_BURST 64 #define RTAP_NUM_BUFFERS 1024 #define RTAP_MAX_QUEUES 128 @@ -317,7 +327,21 @@ rtap_dev_configure(struct rte_eth_dev *dev) if (dev->data->nb_rx_queues != dev->data->nb_tx_queues) return -EINVAL; - if (ioctl(pmd->keep_fd, TUNSETOFFLOAD, 0) != 0) { + /* + * Set offload flags visible on the kernel network interface. + * This controls whether kernel will use checksum offload etc. + * Note: kernel transmit is DPDK receive. + */ + const struct rte_eth_rxmode *rx_mode = &dev->data->dev_conf.rxmode; + unsigned int offload = 0; + if (rx_mode->offloads & RTE_ETH_RX_OFFLOAD_CHECKSUM) { + offload |= TUN_F_CSUM; + + if (rx_mode->offloads & RTE_ETH_RX_OFFLOAD_TCP_LRO) + offload |= TUN_F_TSO4 | TUN_F_TSO6 | TUN_F_TSO_ECN; + } + + if (ioctl(pmd->keep_fd, TUNSETOFFLOAD, offload) != 0) { PMD_LOG(ERR, "ioctl(TUNSETOFFLOAD) failed: %s", strerror(errno)); return -1; } @@ -336,6 +360,10 @@ rtap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info) dev_info->min_rx_bufsize = RTAP_MIN_RX_BUFSIZE; dev_info->max_rx_queues = RTAP_MAX_QUEUES; dev_info->max_tx_queues = RTAP_MAX_QUEUES; + dev_info->rx_queue_offload_capa = RTAP_RX_OFFLOAD; + dev_info->rx_offload_capa = dev_info->rx_queue_offload_capa; + dev_info->tx_queue_offload_capa = RTAP_TX_OFFLOAD; + dev_info->tx_offload_capa = dev_info->tx_queue_offload_capa; dev_info->default_rxportconf = (struct rte_eth_dev_portconf) { .burst_size = RTAP_DEFAULT_BURST, -- 2.51.0