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author | Stephen Hemminger <stephen@networkplumber.org> | 2020-02-28 13:55:38 -0800 |
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committer | Stephen Hemminger <stephen@networkplumber.org> | 2020-02-28 13:55:38 -0800 |
commit | b5a77cf70116f4c5c1767f0e0ab78f7ff2f58bca (patch) | |
tree | 921c4ba38e478feeea33c2ad7e09cf2d2b99e351 | |
parent | 31824e2299bf5dc609026436db629b0c25cc1a10 (diff) | |
download | iproute2-b5a77cf70116f4c5c1767f0e0ab78f7ff2f58bca.tar.gz |
uapi: update bpf.h
Updated upstream
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
-rw-r--r-- | include/uapi/linux/bpf.h | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 2a8701bf7..657645801 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -1045,9 +1045,9 @@ union bpf_attr { * supports redirection to the egress interface, and accepts no * flag at all. * - * The same effect can be attained with the more generic - * **bpf_redirect_map**\ (), which requires specific maps to be - * used but offers better performance. + * The same effect can also be attained with the more generic + * **bpf_redirect_map**\ (), which uses a BPF map to store the + * redirect target instead of providing it directly to the helper. * Return * For XDP, the helper returns **XDP_REDIRECT** on success or * **XDP_ABORTED** on error. For other program types, the values @@ -1611,13 +1611,11 @@ union bpf_attr { * the caller. Any higher bits in the *flags* argument must be * unset. * - * When used to redirect packets to net devices, this helper - * provides a high performance increase over **bpf_redirect**\ (). - * This is due to various implementation details of the underlying - * mechanisms, one of which is the fact that **bpf_redirect_map**\ - * () tries to send packet as a "bulk" to the device. + * See also bpf_redirect(), which only supports redirecting to an + * ifindex, but doesn't require a map to do so. * Return - * **XDP_REDIRECT** on success, or **XDP_ABORTED** on error. + * **XDP_REDIRECT** on success, or the value of the two lower bits + * of the **flags* argument on error. * * int bpf_sk_redirect_map(struct sk_buff *skb, struct bpf_map *map, u32 key, u64 flags) * Description |