netdev - [PATCH net-next 14/17] virtio_net: xsk: rx: support recv small mode

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Date: Tue, 16 Jan 2024 17:43:10 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: netdev@...r.kernel.org
Cc: "Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	virtualization@...ts.linux.dev,
	bpf@...r.kernel.org
Subject: [PATCH net-next 14/17] virtio_net: xsk: rx: support recv small mode

receive the xsk buffer for small mode.

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/net/virtio/xsk.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/net/virtio/xsk.c b/drivers/net/virtio/xsk.c
index 6f4fa32b1184..a73559faadf6 100644
--- a/drivers/net/virtio/xsk.c
+++ b/drivers/net/virtio/xsk.c
@@ -200,6 +200,37 @@ static struct sk_buff *virtnet_receive_xsk_merge(struct net_device *dev, struct
 	return NULL;
 }
 
+static struct sk_buff *virtnet_receive_xsk_small(struct net_device *dev, struct virtnet_info *vi,
+						 struct virtnet_rq *rq, struct xdp_buff *xdp,
+						 unsigned int *xdp_xmit,
+						 struct virtnet_rq_stats *stats)
+{
+	struct bpf_prog *prog;
+	u32 ret;
+
+	ret = XDP_PASS;
+	rcu_read_lock();
+	prog = rcu_dereference(rq->xdp_prog);
+	if (prog)
+		ret = virtnet_xdp_handler(prog, xdp, dev, xdp_xmit, stats);
+	rcu_read_unlock();
+
+	switch (ret) {
+	case XDP_PASS:
+		return xdp_construct_skb(rq, xdp);
+
+	case XDP_TX:
+	case XDP_REDIRECT:
+		return NULL;
+
+	default:
+		/* drop packet */
+		xsk_buff_free(xdp);
+		u64_stats_inc(&stats->drops);
+		return NULL;
+	}
+}
+
 struct sk_buff *virtnet_receive_xsk_buf(struct virtnet_info *vi, struct virtnet_rq *rq,
 					void *buf, u32 len,
 					unsigned int *xdp_xmit,
@@ -226,6 +257,8 @@ struct sk_buff *virtnet_receive_xsk_buf(struct virtnet_info *vi, struct virtnet_
 
 	if (vi->mergeable_rx_bufs)
 		skb = virtnet_receive_xsk_merge(dev, vi, rq, xdp, xdp_xmit, stats);
+	else
+		skb = virtnet_receive_xsk_small(dev, vi, rq, xdp, xdp_xmit, stats);
 
 	return skb;
 }
-- 
2.32.0.3.g01195cf9f