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Wed, 15 Apr 2026 01:27:32 -0700 (PDT) From: Jason Xing To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, bjorn@kernel.org, magnus.karlsson@intel.com, maciej.fijalkowski@intel.com, jonathan.lemon@gmail.com, sdf@fomichev.me, ast@kernel.org, daniel@iogearbox.net, hawk@kernel.org, john.fastabend@gmail.com Cc: bpf@vger.kernel.org, netdev@vger.kernel.org, Jason Xing Subject: [PATCH RFC net-next v4 05/14] xsk: add direct xmit in batch function Date: Wed, 15 Apr 2026 16:26:45 +0800 Message-Id: <20260415082654.21026-6-kerneljasonxing@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20260415082654.21026-1-kerneljasonxing@gmail.com> References: <20260415082654.21026-1-kerneljasonxing@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Jason Xing Add batch xmit logic. Only grabbing the lock and disable bottom half once and sent all the aggregated packets in one loop. Via skb->list, the already built skbs can be handled one by one. Signed-off-by: Jason Xing --- include/net/xdp_sock.h | 1 + net/core/dev.c | 41 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 42 insertions(+) diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h index 2151aab8f0a1..0609e3b04279 100644 --- a/include/net/xdp_sock.h +++ b/include/net/xdp_sock.h @@ -141,6 +141,7 @@ struct sk_buff *xsk_build_skb(struct xdp_sock *xs, struct sk_buff *allocated_skb, struct xdp_desc *desc); int xsk_alloc_batch_skb(struct xdp_sock *xs, u32 nb_pkts, u32 nb_descs, int *err); +int xsk_direct_xmit_batch(struct xdp_sock *xs, struct net_device *dev); /** * xsk_tx_metadata_to_compl - Save enough relevant metadata information diff --git a/net/core/dev.c b/net/core/dev.c index 4519f0e59beb..e33a2406d8ca 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -163,6 +163,7 @@ #include #include #include +#include #include "dev.h" #include "devmem.h" @@ -4893,6 +4894,46 @@ int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev) } EXPORT_SYMBOL(__dev_queue_xmit); +int xsk_direct_xmit_batch(struct xdp_sock *xs, struct net_device *dev) +{ + u16 queue_id = xs->queue_id; + struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_id); + struct sk_buff_head *send_queue = &xs->batch.send_queue; + int ret = NETDEV_TX_BUSY; + struct sk_buff *skb; + + local_bh_disable(); + HARD_TX_LOCK(dev, txq, smp_processor_id()); + while ((skb = __skb_dequeue(send_queue)) != NULL) { + struct sk_buff *orig_skb = skb; + bool again = false; + + skb = validate_xmit_skb_list(skb, dev, &again); + if (skb != orig_skb) { + dev_core_stats_tx_dropped_inc(dev); + kfree_skb_list(skb); + ret = NET_XMIT_DROP; + break; + } + + if (netif_xmit_frozen_or_drv_stopped(txq)) { + __skb_queue_head(send_queue, skb); + break; + } + skb_set_queue_mapping(skb, queue_id); + ret = netdev_start_xmit(skb, dev, txq, false); + if (ret != NETDEV_TX_OK) { + if (ret == NETDEV_TX_BUSY) + __skb_queue_head(send_queue, skb); + break; + } + } + HARD_TX_UNLOCK(dev, txq); + local_bh_enable(); + + return ret; +} + int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id) { struct net_device *dev = skb->dev; -- 2.41.3