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samples/bpf: fix xdpsock l2fwd tx for unaligned mode

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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: 03895e63ff ("samples/bpf: add buffer recycling for unaligned chunks to xdpsock")
Signed-off-by: Ciara Loftus <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
This commit is contained in:
Ciara Loftus 2019-09-13 10:39:48 +00:00 • committed by Daniel Borkmann
commit 5a712e1363
1 changed files with 1 additions and 1 deletions
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samples/bpf/xdpsock_user.c
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@ -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);