@@ -405,10 +405,6 @@ static struct sk_buff *veth_build_skb(void *head, int headroom, int len,
{
struct sk_buff *skb;
- if (!buflen) {
- buflen = SKB_DATA_ALIGN(headroom + len) +
- SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
- }
skb = build_skb(head, buflen);
if (!skb)
return NULL;
@@ -583,6 +579,7 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq,
xdp.data = frame->data;
xdp.data_end = frame->data + frame->len;
xdp.data_meta = frame->data - frame->metasize;
+ xdp.frame_sz = frame->frame_sz;
xdp.rxq = &rq->xdp_rxq;
act = bpf_prog_run_xdp(xdp_prog, &xdp);
@@ -629,7 +626,7 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq,
rcu_read_unlock();
headroom = sizeof(struct xdp_frame) + frame->headroom - delta;
- skb = veth_build_skb(hard_start, headroom, len, 0);
+ skb = veth_build_skb(hard_start, headroom, len, frame->frame_sz);
if (!skb) {
xdp_return_frame(frame);
stats->rx_drops++;
@@ -695,9 +692,8 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq,
goto drop;
}
- nskb = veth_build_skb(head,
- VETH_XDP_HEADROOM + mac_len, skb->len,
- PAGE_SIZE);
+ nskb = veth_build_skb(head, VETH_XDP_HEADROOM + mac_len,
+ skb->len, PAGE_SIZE);
if (!nskb) {
page_frag_free(head);
goto drop;
@@ -715,6 +711,11 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq,
xdp.data_end = xdp.data + pktlen;
xdp.data_meta = xdp.data;
xdp.rxq = &rq->xdp_rxq;
+
+ /* SKB "head" area always have tailroom for skb_shared_info */
+ xdp.frame_sz = (void *)skb_end_pointer(skb) - xdp.data_hard_start;
+ xdp.frame_sz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+
orig_data = xdp.data;
orig_data_end = xdp.data_end;
@@ -758,6 +759,7 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq,
}
rcu_read_unlock();
+ /* check if bpf_xdp_adjust_head was used */
delta = orig_data - xdp.data;
off = mac_len + delta;
if (off > 0)
@@ -765,9 +767,11 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq,
else if (off < 0)
__skb_pull(skb, -off);
skb->mac_header -= delta;
+
+ /* check if bpf_xdp_adjust_tail was used */
off = xdp.data_end - orig_data_end;
if (off != 0)
- __skb_put(skb, off);
+ __skb_put(skb, off); /* positive on grow, negative on shrink */
skb->protocol = eth_type_trans(skb, rq->dev);
metalen = xdp.data - xdp.data_meta;
The veth driver can run XDP in "native" mode in it's own NAPI handler, and since commit 9fc8d518d9d5 ("veth: Handle xdp_frames in xdp napi ring") packets can come in two forms either xdp_frame or skb, calling respectively veth_xdp_rcv_one() or veth_xdp_rcv_skb(). For packets to arrive in xdp_frame format, they will have been redirected from an XDP native driver. In case of XDP_PASS or no XDP-prog attached, the veth driver will allocate and create an SKB. The current code in veth_xdp_rcv_one() xdp_frame case, had to guess the frame truesize of the incoming xdp_frame, when using veth_build_skb(). With xdp_frame->frame_sz this is not longer necessary. Calculating the frame_sz in veth_xdp_rcv_skb() skb case, is done similar to the XDP-generic handling code in net/core/dev.c. Cc: Toshiaki Makita <toshiaki.makita1@gmail.com> Reviewed-by: Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> --- drivers/net/veth.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-)