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bpf: sync bpf.h to tools infrastructure 

Pull in updates in BPF helper function description.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2019-08-08 13:57:26 +02:00 committed by David S. Miller
parent cd48bdda4f
commit 609a2ca57a
1 changed files with 7 additions and 4 deletions
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11
tools/include/uapi/linux/bpf.h
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@ -1466,8 +1466,8 @@ union bpf_attr {
* If no cookie has been set yet, generate a new cookie. Once
* generated, the socket cookie remains stable for the life of the
* socket. This helper can be useful for monitoring per socket
* networking traffic statistics as it provides a unique socket
* identifier per namespace.
* networking traffic statistics as it provides a global socket
* identifier that can be assumed unique.
* Return
* A 8-byte long non-decreasing number on success, or 0 if the
* socket field is missing inside *skb*.
@ -1571,8 +1571,11 @@ union bpf_attr {
* but this is only implemented for native XDP (with driver
* support) as of this writing).
*
* All values for *flags* are reserved for future usage, and must
* be left at zero.
* The lower two bits of *flags* are used as the return code if
* the map lookup fails. This is so that the return value can be
* one of the XDP program return codes up to XDP_TX, as chosen by
* 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**\ ().