veth: schedule the peer's NAPI after XDP_TX when only GRO is enabled

veth_xdp_xmit() queues XDP_TX frames on the peer's ring if the peer has
NAPI. A peer with GRO enabled and no XDP program also has NAPI.

veth_xdp_flush() then schedules the peer's NAPI, but only if the peer's
xdp_prog is set, so for such a peer the frames are never processed.
Nothing else schedules that NAPI by default.

Once the ring is full, every XDP_TX frame is dropped, and so are the
skbs that veth_xmit() queues on the same ring.

Commit 0e672f306a28 ("veth: check for NAPI instead of xdp_prog before
xmit of XDP frame") changed the check in veth_xdp_xmit() but not the one
in veth_xdp_flush(). Make veth_xdp_flush() check the napi pointer
instead of xdp_prog, as veth_xdp_xmit() does.

Fixes: 0e672f306a28 ("veth: check for NAPI instead of xdp_prog before xmit of XDP frame")
Signed-off-by: Tianyi Gao <tianyi@cloudflare.com>
Reviewed-by: Mohsin Bashir <hmohsin@meta.com>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Acked-by: Jesper Dangaard Brouer <hawk@kernel.org>
Link: https://patch.msgid.link/20261016214217.16942-2-tianyi@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

0 files changed, 0 insertions, 0 deletions