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Mon, 07 Aug 2023 20:20:56 -0700 (PDT) From: Albert Huang To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: Albert Huang , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , Magnus Karlsson , Maciej Fijalkowski , Jonathan Lemon , Pavel Begunkov , Yunsheng Lin , Kees Cook , Richard Gobert , "open list:NETWORKING DRIVERS" , open list , "open list:XDP (eXpress Data Path)" Subject: [RFC v3 Optimizing veth xsk performance 5/9] veth: use send queue tx napi to xmit xsk tx desc Date: Tue, 8 Aug 2023 11:19:09 +0800 Message-Id: <20230808031913.46965-6-huangjie.albert@bytedance.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20230808031913.46965-1-huangjie.albert@bytedance.com> References: <20230808031913.46965-1-huangjie.albert@bytedance.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1773675851967737719 X-GMAIL-MSGID: 1773675851967737719 use send queue tx napi to xmit xsk tx desc Signed-off-by: Albert Huang --- drivers/net/veth.c | 230 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 229 insertions(+), 1 deletion(-) diff --git a/drivers/net/veth.c b/drivers/net/veth.c index 25faba879505..28b891dd8dc9 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -27,6 +27,8 @@ #include #include #include +#include +#include #define DRV_NAME "veth" #define DRV_VERSION "1.0" @@ -1061,6 +1063,141 @@ static int veth_poll(struct napi_struct *napi, int budget) return done; } +static struct sk_buff *veth_build_skb(void *head, int headroom, int len, + int buflen) +{ + struct sk_buff *skb; + + skb = build_skb(head, buflen); + if (!skb) + return NULL; + + skb_reserve(skb, headroom); + skb_put(skb, len); + + return skb; +} + +static int veth_xsk_tx_xmit(struct veth_sq *sq, struct xsk_buff_pool *xsk_pool, int budget) +{ + struct veth_priv *priv, *peer_priv; + struct net_device *dev, *peer_dev; + struct veth_stats stats = {}; + struct sk_buff *skb = NULL; + struct veth_rq *peer_rq; + struct xdp_desc desc; + int done = 0; + + dev = sq->dev; + priv = netdev_priv(dev); + peer_dev = priv->peer; + peer_priv = netdev_priv(peer_dev); + + /* todo: queue index must set before this */ + peer_rq = &peer_priv->rq[sq->queue_index]; + + /* set xsk wake up flag, to do: where to disable */ + if (xsk_uses_need_wakeup(xsk_pool)) + xsk_set_tx_need_wakeup(xsk_pool); + + while (budget-- > 0) { + unsigned int truesize = 0; + struct page *page; + void *vaddr; + void *addr; + + if (!xsk_tx_peek_desc(xsk_pool, &desc)) + break; + + addr = xsk_buff_raw_get_data(xsk_pool, desc.addr); + + /* can not hold all data in a page */ + truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); + truesize += desc.len + xsk_pool->headroom; + if (truesize > PAGE_SIZE) { + xsk_tx_completed_addr(xsk_pool, desc.addr); + stats.xdp_drops++; + break; + } + + page = dev_alloc_page(); + if (!page) { + xsk_tx_completed_addr(xsk_pool, desc.addr); + stats.xdp_drops++; + break; + } + vaddr = page_to_virt(page); + + memcpy(vaddr + xsk_pool->headroom, addr, desc.len); + xsk_tx_completed_addr(xsk_pool, desc.addr); + + skb = veth_build_skb(vaddr, xsk_pool->headroom, desc.len, PAGE_SIZE); + if (!skb) { + put_page(page); + stats.xdp_drops++; + break; + } + skb->protocol = eth_type_trans(skb, peer_dev); + napi_gro_receive(&peer_rq->xdp_napi, skb); + + stats.xdp_bytes += desc.len; + done++; + } + + /* release, move consumer，and wakeup the producer */ + if (done) { + napi_schedule(&peer_rq->xdp_napi); + xsk_tx_release(xsk_pool); + } + + u64_stats_update_begin(&sq->stats.syncp); + sq->stats.vs.xdp_packets += done; + sq->stats.vs.xdp_bytes += stats.xdp_bytes; + sq->stats.vs.xdp_drops += stats.xdp_drops; + u64_stats_update_end(&sq->stats.syncp); + + return done; +} + +static int veth_poll_tx(struct napi_struct *napi, int budget) +{ + struct veth_sq *sq = container_of(napi, struct veth_sq, xdp_napi); + struct xsk_buff_pool *pool; + int done = 0; + + sq->xsk.last_cpu = smp_processor_id(); + + /* xmit for tx queue */ + rcu_read_lock(); + pool = rcu_dereference(sq->xsk.pool); + if (pool) + done = veth_xsk_tx_xmit(sq, pool, budget); + + rcu_read_unlock(); + + if (done < budget) { + /* if done < budget, the tx ring is no buffer */ + napi_complete_done(napi, done); + } + + return done; +} + +static int veth_napi_add_tx(struct net_device *dev) +{ + struct veth_priv *priv = netdev_priv(dev); + int i; + + for (i = 0; i < dev->real_num_rx_queues; i++) { + struct veth_sq *sq = &priv->sq[i]; + + netif_napi_add(dev, &sq->xdp_napi, veth_poll_tx); + napi_enable(&sq->xdp_napi); + } + + return 0; +} + static int veth_create_page_pool(struct veth_rq *rq) { struct page_pool_params pp_params = { @@ -1153,6 +1290,19 @@ static void veth_napi_del_range(struct net_device *dev, int start, int end) } } +static void veth_napi_del_tx(struct net_device *dev) +{ + struct veth_priv *priv = netdev_priv(dev); + int i; + + for (i = 0; i < dev->real_num_rx_queues; i++) { + struct veth_sq *sq = &priv->sq[i]; + + napi_disable(&sq->xdp_napi); + __netif_napi_del(&sq->xdp_napi); + } +} + static void veth_napi_del(struct net_device *dev) { veth_napi_del_range(dev, 0, dev->real_num_rx_queues); @@ -1360,7 +1510,7 @@ static void veth_set_xdp_features(struct net_device *dev) struct veth_priv *priv_peer = netdev_priv(peer); xdp_features_t val = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT | - NETDEV_XDP_ACT_RX_SG; + NETDEV_XDP_ACT_RX_SG | NETDEV_XDP_ACT_XSK_ZEROCOPY; if (priv_peer->_xdp_prog || veth_gro_requested(peer)) val |= NETDEV_XDP_ACT_NDO_XMIT | @@ -1737,11 +1887,89 @@ static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, return err; } +static int veth_xsk_pool_enable(struct net_device *dev, struct xsk_buff_pool *pool, u16 qid) +{ + struct veth_priv *peer_priv; + struct veth_priv *priv = netdev_priv(dev); + struct net_device *peer_dev = priv->peer; + int err = 0; + + if (qid >= dev->real_num_tx_queues) + return -EINVAL; + + if (!peer_dev) + return -EINVAL; + + /* no dma, so we just skip dma skip in xsk zero copy */ + pool->dma_check_skip = true; + + peer_priv = netdev_priv(peer_dev); + + /* enable peer tx xdp here, this side + * xdp is enable by veth_xdp_set + * to do: we need to check whther this side is already enable xdp + * maybe it do not have xdp prog + */ + if (!(peer_priv->_xdp_prog) && (!veth_gro_requested(peer_dev))) { + /* peer should enable napi*/ + err = veth_napi_enable(peer_dev); + if (err) + return err; + } + + /* Here is already protected by rtnl_lock, so rcu_assign_pointer + * is safe. + */ + rcu_assign_pointer(priv->sq[qid].xsk.pool, pool); + + veth_napi_add_tx(dev); + + return err; +} + +static int veth_xsk_pool_disable(struct net_device *dev, u16 qid) +{ + struct veth_priv *peer_priv; + struct veth_priv *priv = netdev_priv(dev); + struct net_device *peer_dev = priv->peer; + int err = 0; + + if (qid >= dev->real_num_tx_queues) + return -EINVAL; + + if (!peer_dev) + return -EINVAL; + + peer_priv = netdev_priv(peer_dev); + + /* to do: this may be failed */ + if (!(peer_priv->_xdp_prog) && (!veth_gro_requested(peer_dev))) { + /* disable peer napi */ + veth_napi_del(peer_dev); + } + + veth_napi_del_tx(dev); + + rcu_assign_pointer(priv->sq[qid].xsk.pool, NULL); + return err; +} + +/* this is for setup xdp */ +static int veth_xsk_pool_setup(struct net_device *dev, struct netdev_bpf *xdp) +{ + if (xdp->xsk.pool) + return veth_xsk_pool_enable(dev, xdp->xsk.pool, xdp->xsk.queue_id); + else + return veth_xsk_pool_disable(dev, xdp->xsk.queue_id); +} + static int veth_xdp(struct net_device *dev, struct netdev_bpf *xdp) { switch (xdp->command) { case XDP_SETUP_PROG: return veth_xdp_set(dev, xdp->prog, xdp->extack); + case XDP_SETUP_XSK_POOL: + return veth_xsk_pool_setup(dev, xdp); default: return -EINVAL; }