From: Jesper Dangaard Brouer brouer@redhat.com
[ Upstream commit 88eb0ee17b2ece64fcf6689a4557a5c2e7a89c4b ]
The ixgbe driver have another memory model when compiled on archs with PAGE_SIZE above 4096 bytes. In this mode it doesn't split the page in two halves, but instead increment rx_buffer->page_offset by truesize of packet (which include headroom and tailroom for skb_shared_info).
This is done correctly in ixgbe_build_skb(), but in ixgbe_rx_buffer_flip which is currently only called on XDP_TX and XDP_REDIRECT, it forgets to add the tailroom for skb_shared_info. This breaks XDP_REDIRECT, for veth and cpumap. Fix by adding size of skb_shared_info tailroom.
Maintainers notice: This fix have been queued to Jeff.
Fixes: 6453073987ba ("ixgbe: add initial support for xdp redirect") Signed-off-by: Jesper Dangaard Brouer brouer@redhat.com Signed-off-by: Alexei Starovoitov ast@kernel.org Cc: Jeff Kirsher jeffrey.t.kirsher@intel.com Link: https://lore.kernel.org/bpf/158945344946.97035.17031588499266605743.stgit@fi... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index 718931d951bc..ea6834bae04c 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -2254,7 +2254,8 @@ static void ixgbe_rx_buffer_flip(struct ixgbe_ring *rx_ring, rx_buffer->page_offset ^= truesize; #else unsigned int truesize = ring_uses_build_skb(rx_ring) ? - SKB_DATA_ALIGN(IXGBE_SKB_PAD + size) : + SKB_DATA_ALIGN(IXGBE_SKB_PAD + size) + + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) : SKB_DATA_ALIGN(size);
rx_buffer->page_offset += truesize;