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libbpf: Fixes incorrect rx_ring_setup_done

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When calling xsk_socket__create_shared(), the logic at line 1097 marks a
boolean flag true within the xsk_umem structure to track setup progress
in order to support multiple calls to the function.  However, instead of
marking umem->tx_ring_setup_done, the code incorrectly sets
umem->rx_ring_setup_done.  This leads to improper behaviour when
creating and destroying xsk and umem structures.

Multiple calls to this function is documented as supported.

Fixes: ca7a83e248 ("libbpf: Only create rx and tx XDP rings when necessary")
Signed-off-by: Kev Jackson <foamdino@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/YL4aU4f3Aaik7CN0@linux-dev
This commit is contained in:
Kev Jackson 2021-06-07 14:08:35 +01:00 committed by Andrii Nakryiko
parent 1a8024239d
commit 11fc79fc9f
1 changed files with 1 additions and 1 deletions
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2
tools/lib/bpf/xsk.c
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@ -1094,7 +1094,7 @@ int xsk_socket__create_shared(struct xsk_socket **xsk_ptr,
goto out_put_ctx;
}
if (xsk->fd == umem->fd)
umem->rx_ring_setup_done = true;
umem->tx_ring_setup_done = true;
}
err = xsk_get_mmap_offsets(xsk->fd, &off);