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libbpf: Allow for creating Rx or Tx only AF_XDP sockets

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The libbpf AF_XDP code is extended to allow for the creation of Rx
only or Tx only sockets. Previously it returned an error if the socket
was not initialized for both Rx and Tx.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Tested-by: William Tu <u9012063@gmail.com>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Link: https://lore.kernel.org/bpf/1573148860-30254-4-git-send-email-magnus.karlsson@intel.com
This commit is contained in:
Magnus Karlsson 2019-11-07 18:47:38 +01:00 committed by Alexei Starovoitov
parent 2e5d72c15f
commit a68977d269
1 changed files with 3 additions and 2 deletions
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5
tools/lib/bpf/xsk.c
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@ -562,7 +562,8 @@ static int xsk_setup_xdp_prog(struct xsk_socket *xsk)
}
}
err = xsk_set_bpf_maps(xsk);
if (xsk->rx)
err = xsk_set_bpf_maps(xsk);
if (err) {
xsk_delete_bpf_maps(xsk);
close(xsk->prog_fd);
@ -583,7 +584,7 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
struct xsk_socket *xsk;
int err;
if (!umem || !xsk_ptr || !rx || !tx)
if (!umem || !xsk_ptr || !(rx || tx))
return -EFAULT;
xsk = calloc(1, sizeof(*xsk));