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Message-Id: <20230418065327.72281-6-xuanzhuo@linux.alibaba.com>
Date: Tue, 18 Apr 2023 14:53:18 +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>,
"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-foundation.org, bpf@...r.kernel.org
Subject: [PATCH net-next v2 05/14] virtio_net: introduce xdp res enums
virtnet_xdp_handler() is to process all the logic related to XDP. The
caller only needs to care about how to deal with the buf. So this commit
introduces new enums:
1. VIRTNET_XDP_RES_PASS: make skb by the buf
2. VIRTNET_XDP_RES_DROP: xdp return drop action or some error, caller
should release the buf
3. VIRTNET_XDP_RES_CONSUMED: xdp consumed the buf, the caller doesnot to
do anything
Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
drivers/net/virtio_net.c | 42 ++++++++++++++++++++++++++--------------
1 file changed, 27 insertions(+), 15 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 0fa64c314ea7..4dfdc211d355 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -301,6 +301,15 @@ struct padded_vnet_hdr {
char padding[12];
};
+enum {
+ /* xdp pass */
+ VIRTNET_XDP_RES_PASS,
+ /* drop packet. the caller needs to release the page. */
+ VIRTNET_XDP_RES_DROP,
+ /* packet is consumed by xdp. the caller needs to do nothing. */
+ VIRTNET_XDP_RES_CONSUMED,
+};
+
static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf);
static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf);
@@ -803,14 +812,14 @@ static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
switch (act) {
case XDP_PASS:
- return act;
+ return VIRTNET_XDP_RES_PASS;
case XDP_TX:
stats->xdp_tx++;
xdpf = xdp_convert_buff_to_frame(xdp);
if (unlikely(!xdpf)) {
netdev_dbg(dev, "convert buff to frame failed for xdp\n");
- return XDP_DROP;
+ return VIRTNET_XDP_RES_DROP;
}
err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
@@ -818,19 +827,20 @@ static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
xdp_return_frame_rx_napi(xdpf);
} else if (unlikely(err < 0)) {
trace_xdp_exception(dev, xdp_prog, act);
- return XDP_DROP;
+ return VIRTNET_XDP_RES_DROP;
}
+
*xdp_xmit |= VIRTIO_XDP_TX;
- return act;
+ return VIRTNET_XDP_RES_CONSUMED;
case XDP_REDIRECT:
stats->xdp_redirects++;
err = xdp_do_redirect(dev, xdp, xdp_prog);
if (err)
- return XDP_DROP;
+ return VIRTNET_XDP_RES_DROP;
*xdp_xmit |= VIRTIO_XDP_REDIR;
- return act;
+ return VIRTNET_XDP_RES_CONSUMED;
default:
bpf_warn_invalid_xdp_action(dev, xdp_prog, act);
@@ -839,7 +849,7 @@ static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp,
trace_xdp_exception(dev, xdp_prog, act);
fallthrough;
case XDP_DROP:
- return XDP_DROP;
+ return VIRTNET_XDP_RES_DROP;
}
}
@@ -987,17 +997,18 @@ static struct sk_buff *receive_small(struct net_device *dev,
act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats);
switch (act) {
- case XDP_PASS:
+ case VIRTNET_XDP_RES_PASS:
/* Recalculate length in case bpf program changed it */
delta = orig_data - xdp.data;
len = xdp.data_end - xdp.data;
metasize = xdp.data - xdp.data_meta;
break;
- case XDP_TX:
- case XDP_REDIRECT:
+
+ case VIRTNET_XDP_RES_CONSUMED:
rcu_read_unlock();
goto xdp_xmit;
- default:
+
+ case VIRTNET_XDP_RES_DROP:
goto err_xdp;
}
}
@@ -1324,18 +1335,19 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats);
switch (act) {
- case XDP_PASS:
+ case VIRTNET_XDP_RES_PASS:
head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz);
if (unlikely(!head_skb))
goto err_xdp_frags;
rcu_read_unlock();
return head_skb;
- case XDP_TX:
- case XDP_REDIRECT:
+
+ case VIRTNET_XDP_RES_CONSUMED:
rcu_read_unlock();
goto xdp_xmit;
- default:
+
+ case VIRTNET_XDP_RES_DROP:
break;
}
err_xdp_frags:
--
2.32.0.3.g01195cf9f
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