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authorPetar Penkov <ppenkov@google.com>2018-12-03 04:18:19 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2018-12-03 23:37:51 +0300
commite3da08d057002f9d0831949d51666c3e15dc6b29 (patch)
tree1e7a9ef1d6ad44355a50a26ef15a159fd807c72b /tools/include
parentde94b651eef38b44adc20057ab5eb6d4ca672169 (diff)
downloadlinux-e3da08d057002f9d0831949d51666c3e15dc6b29.tar.xz
bpf: allow BPF read access to qdisc pkt_len
The pkt_len field in qdisc_skb_cb stores the skb length as it will appear on the wire after segmentation. For byte accounting, this value is more accurate than skb->len. It is computed on entry to the TC layer, so only valid there. Allow read access to this field from BPF tc classifier and action programs. The implementation is analogous to tc_classid, aside from restricting to read access. To distinguish it from skb->len and self-describe export as wire_len. Changes v1->v2 - Rename pkt_len to wire_len Signed-off-by: Petar Penkov <ppenkov@google.com> Signed-off-by: Vlad Dumitrescu <vladum@google.com> Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/include')
-rw-r--r--tools/include/uapi/linux/bpf.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 8050caea7495..0183b8e70a9e 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -2497,6 +2497,7 @@ struct __sk_buff {
__u32 data_meta;
struct bpf_flow_keys *flow_keys;
__u64 tstamp;
+ __u32 wire_len;
};
struct bpf_tunnel_key {