path: root/samples
diff options
authorCiara Loftus <>2019-09-13 10:39:48 +0000
committerDaniel Borkmann <>2019-09-16 09:35:10 +0200
commit5a712e1363c8ecb4b504a888833ef91416314c36 (patch)
tree8b79b58d9ea4bcb2cb9b9d56907a3aa2907ecea8 /samples
parent2e78fc620f5c62e94cab4a8240b2a76de38cd514 (diff)
samples/bpf: fix xdpsock l2fwd tx for unaligned mode
Preserve the offset of the address of the received descriptor, and include it in the address set for the tx descriptor, so the kernel can correctly locate the start of the packet data. Fixes: 03895e63ff97 ("samples/bpf: add buffer recycling for unaligned chunks to xdpsock") Signed-off-by: Ciara Loftus <> Signed-off-by: Daniel Borkmann <>
Diffstat (limited to 'samples')
1 files changed, 1 insertions, 1 deletions
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index 102eace22956..df011ac33402 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -685,7 +685,7 @@ static void l2fwd(struct xsk_socket_info *xsk, struct pollfd *fds)
for (i = 0; i < rcvd; i++) {
u64 addr = xsk_ring_cons__rx_desc(&xsk->rx, idx_rx)->addr;
u32 len = xsk_ring_cons__rx_desc(&xsk->rx, idx_rx++)->len;
- u64 orig = xsk_umem__extract_addr(addr);
+ u64 orig = addr;
addr = xsk_umem__add_offset_to_addr(addr);
char *pkt = xsk_umem__get_data(xsk->umem->buffer, addr);