linux-kernel - [RFC Optimizing veth xsk performance 06/10] veth: add ndo_xsk

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Message-Id: <20230803140441.53596-7-huangjie.albert@bytedance.com>
Date:   Thu,  3 Aug 2023 22:04:32 +0800
From:   "huangjie.albert" <huangjie.albert@...edance.com>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     "huangjie.albert" <huangjie.albert@...edance.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Pavel Begunkov <asml.silence@...il.com>,
        Shmulik Ladkani <shmulik.ladkani@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Richard Gobert <richardbgobert@...il.com>,
        Yunsheng Lin <linyunsheng@...wei.com>,
        netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
        linux-kernel@...r.kernel.org (open list),
        bpf@...r.kernel.org (open list:XDP (eXpress Data Path))
Subject: [RFC Optimizing veth xsk performance 06/10] veth: add ndo_xsk_wakeup callback for veth

Signed-off-by: huangjie.albert <huangjie.albert@...edance.com>
---
 drivers/net/veth.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 944761807ca4..600225e27e9e 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1840,6 +1840,45 @@ static void veth_set_rx_headroom(struct net_device *dev, int new_hr)
 	rcu_read_unlock();
 }
 
+static void veth_xsk_remote_trigger_napi(void *info)
+{
+	struct veth_sq *sq = info;
+
+	napi_schedule(&sq->xdp_napi);
+}
+
+static int veth_xsk_wakeup(struct net_device *dev, u32 qid, u32 flag)
+{
+	struct veth_priv *priv;
+	struct veth_sq *sq;
+	u32 last_cpu, cur_cpu;
+
+	if (!netif_running(dev))
+		return -ENETDOWN;
+
+	if (qid >= dev->real_num_rx_queues)
+		return -EINVAL;
+
+	priv = netdev_priv(dev);
+	sq = &priv->sq[qid];
+
+	if (napi_if_scheduled_mark_missed(&sq->xdp_napi))
+		return 0;
+
+	last_cpu = sq->xsk.last_cpu;
+	cur_cpu = get_cpu();
+
+	/*  raise a napi */
+	if (last_cpu == cur_cpu) {
+		napi_schedule(&sq->xdp_napi);
+	} else {
+		smp_call_function_single(last_cpu, veth_xsk_remote_trigger_napi, sq, true);
+	}
+
+	put_cpu();
+	return 0;
+}
+
 static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog,
 			struct netlink_ext_ack *extack)
 {
@@ -2054,6 +2093,7 @@ static const struct net_device_ops veth_netdev_ops = {
 	.ndo_set_rx_headroom	= veth_set_rx_headroom,
 	.ndo_bpf		= veth_xdp,
 	.ndo_xdp_xmit		= veth_ndo_xdp_xmit,
+	.ndo_xsk_wakeup		= veth_xsk_wakeup,
 	.ndo_get_peer_dev	= veth_peer_dev,
 };
 
-- 
2.20.1