diff options
| author | Jesper Dangaard Brouer <brouer@redhat.com> | 2018-01-03 11:26:14 +0100 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-01-05 15:21:22 -0800 |
| commit | 02dd3291b2f095bbc88e1d2628fd5bf2e92de69b (patch) | |
| tree | 510ccf29fe93e944ecf20ab403c1c3089f843c0f /net/core | |
| parent | e817f85652c14d78f170b18797e4c477c78949e0 (diff) | |
bpf: finally expose xdp_rxq_info to XDP bpf-programs
Now all XDP driver have been updated to setup xdp_rxq_info and assign
this to xdp_buff->rxq. Thus, it is now safe to enable access to some
of the xdp_rxq_info struct members.
This patch extend xdp_md and expose UAPI to userspace for
ingress_ifindex and rx_queue_index. Access happens via bpf
instruction rewrite, that load data directly from struct xdp_rxq_info.
* ingress_ifindex map to xdp_rxq_info->dev->ifindex
* rx_queue_index map to xdp_rxq_info->queue_index
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/filter.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index 130b842c3a15..acdb94c0e97f 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4304,6 +4304,25 @@ static u32 xdp_convert_ctx_access(enum bpf_access_type type, si->dst_reg, si->src_reg, offsetof(struct xdp_buff, data_end)); break; + case offsetof(struct xdp_md, ingress_ifindex): + *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), + si->dst_reg, si->src_reg, + offsetof(struct xdp_buff, rxq)); + *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev), + si->dst_reg, si->dst_reg, + offsetof(struct xdp_rxq_info, dev)); + *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, + bpf_target_off(struct net_device, + ifindex, 4, target_size)); + break; + case offsetof(struct xdp_md, rx_queue_index): + *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), + si->dst_reg, si->src_reg, + offsetof(struct xdp_buff, rxq)); + *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, + bpf_target_off(struct xdp_rxq_info, + queue_index, 4, target_size)); + break; } return insn - insn_buf; |