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xdp: Add xdp_txq_info to xdp_buff

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Add xdp_txq_info as the Tx counterpart to xdp_rxq_info. At the
moment only the device is added. Other fields (queue_index)
can be added as use cases arise.

>From a UAPI perspective, add egress_ifindex to xdp context for
bpf programs to see the Tx device.

Update the verifier to only allow accesses to egress_ifindex by
XDP programs with BPF_XDP_DEVMAP expected attach type.

Signed-off-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/20200529220716.75383-4-dsahern@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
David Ahern 2020-05-29 16:07:14 -06:00 • committed by Alexei Starovoitov
parent fbee97feed
commit 64b59025c1
5 changed files with 29 additions and 0 deletions
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3
kernel/bpf/devmap.c
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@ -476,8 +476,11 @@ static struct xdp_buff *dev_map_run_prog(struct net_device *dev,
struct xdp_buff *xdp,
struct bpf_prog *xdp_prog)
{
struct xdp_txq_info txq = { .dev = dev };
u32 act;
xdp->txq = &txq;
act = bpf_prog_run_xdp(xdp_prog, xdp);
switch (act) {
case XDP_PASS: