The purpose of this patch is to simplify the receive_mergeable().
Separate all the logic of XDP into a function.
Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
---
drivers/net/virtio_net.c | 128 +++++++++++++++++++++++----------------
1 file changed, 76 insertions(+), 52 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 136131a7868a..c8978d8d8adb 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1316,6 +1316,63 @@ static void *mergeable_xdp_prepare(struct virtnet_info *vi,
return page_address(xdp_page) + VIRTIO_XDP_HEADROOM;
}
+static struct sk_buff *receive_mergeable_xdp(struct net_device *dev,
+ struct virtnet_info *vi,
+ struct receive_queue *rq,
+ struct bpf_prog *xdp_prog,
+ void *buf,
+ void *ctx,
+ unsigned int len,
+ unsigned int *xdp_xmit,
+ struct virtnet_rq_stats *stats)
+{
+ struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
+ int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
+ struct page *page = virt_to_head_page(buf);
+ int offset = buf - page_address(page);
+ unsigned int xdp_frags_truesz = 0;
+ struct sk_buff *head_skb;
+ unsigned int frame_sz;
+ struct xdp_buff xdp;
+ void *data;
+ u32 act;
+ int err;
+
+ data = mergeable_xdp_prepare(vi, rq, xdp_prog, ctx, &frame_sz, &num_buf, &page,
+ offset, &len, hdr);
+ if (!data)
+ goto err_xdp;
+
+ err = virtnet_build_xdp_buff_mrg(dev, vi, rq, &xdp, data, len, frame_sz,
+ &num_buf, &xdp_frags_truesz, stats);
+ if (unlikely(err))
+ goto err_xdp;
+
+ act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats);
+
+ switch (act) {
+ 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;
+ return head_skb;
+
+ case VIRTNET_XDP_RES_CONSUMED:
+ return NULL;
+
+ case VIRTNET_XDP_RES_DROP:
+ break;
+ }
+
+err_xdp:
+ put_page(page);
+ mergeable_buf_free(rq, num_buf, dev, stats);
+
+ stats->xdp_drops++;
+ stats->drops++;
+ return NULL;
+}
+
static struct sk_buff *receive_mergeable(struct net_device *dev,
struct virtnet_info *vi,
struct receive_queue *rq,
@@ -1325,21 +1382,22 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
unsigned int *xdp_xmit,
struct virtnet_rq_stats *stats)
{
- struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
- int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
- struct page *page = virt_to_head_page(buf);
- int offset = buf - page_address(page);
- struct sk_buff *head_skb, *curr_skb;
- struct bpf_prog *xdp_prog;
unsigned int truesize = mergeable_ctx_to_truesize(ctx);
unsigned int headroom = mergeable_ctx_to_headroom(ctx);
unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
- unsigned int frame_sz;
- int err;
+ struct virtio_net_hdr_mrg_rxbuf *hdr;
+ struct sk_buff *head_skb, *curr_skb;
+ struct bpf_prog *xdp_prog;
+ struct page *page;
+ int num_buf;
+ int offset;
head_skb = NULL;
stats->bytes += len - vi->hdr_len;
+ hdr = buf;
+ num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
+ page = virt_to_head_page(buf);
if (unlikely(len > truesize - room)) {
pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
@@ -1348,51 +1406,21 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
goto err_skb;
}
- if (likely(!vi->xdp_enabled)) {
- xdp_prog = NULL;
- goto skip_xdp;
- }
-
- rcu_read_lock();
- xdp_prog = rcu_dereference(rq->xdp_prog);
- if (xdp_prog) {
- unsigned int xdp_frags_truesz = 0;
- struct xdp_buff xdp;
- void *data;
- u32 act;
-
- data = mergeable_xdp_prepare(vi, rq, xdp_prog, ctx, &frame_sz, &num_buf, &page,
- offset, &len, hdr);
- if (!data)
- goto err_xdp;
-
- err = virtnet_build_xdp_buff_mrg(dev, vi, rq, &xdp, data, len, frame_sz,
- &num_buf, &xdp_frags_truesz, stats);
- if (unlikely(err))
- goto err_xdp;
-
- act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats);
-
- switch (act) {
- 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;
-
+ if (likely(vi->xdp_enabled)) {
+ rcu_read_lock();
+ xdp_prog = rcu_dereference(rq->xdp_prog);
+ if (xdp_prog) {
+ head_skb = receive_mergeable_xdp(dev, vi, rq, xdp_prog,
+ buf, ctx, len, xdp_xmit,
+ stats);
rcu_read_unlock();
return head_skb;
-
- case VIRTNET_XDP_RES_CONSUMED:
- rcu_read_unlock();
- goto xdp_xmit;
-
- case VIRTNET_XDP_RES_DROP:
- goto err_xdp;
}
+ rcu_read_unlock();
}
- rcu_read_unlock();
-skip_xdp:
+ offset = buf - page_address(page);
+
head_skb = page_to_skb(vi, rq, page, offset, len, truesize, headroom);
curr_skb = head_skb;
@@ -1458,9 +1486,6 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
return head_skb;
-err_xdp:
- rcu_read_unlock();
- stats->xdp_drops++;
err_skb:
put_page(page);
mergeable_buf_free(rq, num_buf, dev, stats);
@@ -1468,7 +1493,6 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
err_buf:
stats->drops++;
dev_kfree_skb(head_skb);
-xdp_xmit:
return NULL;
}
--
2.32.0.3.g01195cf9f
