The previous patch, in order to facilitate review, I do not do any
modification. This patch has made some optimization on the top.
* remove some repeated logics in this function.
* add fast check for passing without any alloc.
Signed-off-by: Xuan Zhuo <xuanz...@linux.alibaba.com>
---
drivers/net/virtio_net.c | 29 ++++++++++++++---------------
1 file changed, 14 insertions(+), 15 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 12559062ffb6..50dc64d80d3b 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1192,6 +1192,11 @@ static void *mergeable_xdp_prepare(struct virtnet_info
*vi,
*/
*frame_sz = truesize;
+ if (likely(headroom >= virtnet_get_headroom(vi) &&
+ (*num_buf == 1 || xdp_prog->aux->xdp_has_frags))) {
+ return page_address(*page) + offset;
+ }
+
/* This happens when headroom is not enough because
* of the buffer was prefilled before XDP is set.
* This should only happen for the first several packets.
@@ -1200,22 +1205,15 @@ static void *mergeable_xdp_prepare(struct virtnet_info
*vi,
* support it, and we don't want to bother users who are
* using xdp normally.
*/
- if (!xdp_prog->aux->xdp_has_frags &&
- (*num_buf > 1 || headroom < virtnet_get_headroom(vi))) {
+ if (!xdp_prog->aux->xdp_has_frags) {
/* linearize data for XDP */
xdp_page = xdp_linearize_page(rq, num_buf,
*page, offset,
VIRTIO_XDP_HEADROOM,
len);
- *frame_sz = PAGE_SIZE;
-
if (!xdp_page)
return NULL;
- offset = VIRTIO_XDP_HEADROOM;
-
- put_page(*page);
- *page = xdp_page;
- } else if (unlikely(headroom < virtnet_get_headroom(vi))) {
+ } else {
xdp_room = SKB_DATA_ALIGN(VIRTIO_XDP_HEADROOM +
sizeof(struct skb_shared_info));
if (*len + xdp_room > PAGE_SIZE)
@@ -1227,14 +1225,15 @@ static void *mergeable_xdp_prepare(struct virtnet_info
*vi,
memcpy(page_address(xdp_page) + VIRTIO_XDP_HEADROOM,
page_address(*page) + offset, *len);
- *frame_sz = PAGE_SIZE;
- offset = VIRTIO_XDP_HEADROOM;
-
- put_page(*page);
- *page = xdp_page;
}
- return page_address(*page) + offset;
+ *frame_sz = PAGE_SIZE;
+
+ put_page(*page);
+
+ *page = xdp_page;
+
+ return page_address(*page) + VIRTIO_XDP_HEADROOM;
}
static struct sk_buff *receive_mergeable(struct net_device *dev,
--
2.32.0.3.g01195cf9f
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