Messages in this thread | | | Subject | Re: [PATCH] bpf: synchronize bpf uapi header with tools | From | Taeung Song <> | Date | Thu, 19 Jul 2018 23:21:47 +0900 |
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Hi Quentin,
On 07/19/2018 11:01 PM, Quentin Monnet wrote: > Hi Taeung, > > 2018-07-19 21:53 UTC+0900 ~ Taeung Song <treeze.taeung@gmail.com> >> To pick the change in: >> >> 4c79579b44b1 ("bpf: Change bpf_fib_lookup to return lookup status") >> >> This bpftool build warning occurs: >> >> Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h' >> >> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> >> Cc: David Ahern <dsahern@gmail.com> >> Signed-off-by: Taeung Song <treeze.taeung@gmail.com> >> --- >> tools/include/uapi/linux/bpf.h | 28 +++++++++++++++++++++++----- >> 1 file changed, 23 insertions(+), 5 deletions(-) >> >> diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h >> index 59b19b6a40d7..b7db3261c62d 100644 >> --- a/tools/include/uapi/linux/bpf.h >> +++ b/tools/include/uapi/linux/bpf.h >> @@ -1857,7 +1857,8 @@ union bpf_attr { >> * is resolved), the nexthop address is returned in ipv4_dst >> * or ipv6_dst based on family, smac is set to mac address of >> * egress device, dmac is set to nexthop mac address, rt_metric >> - * is set to metric from route (IPv4/IPv6 only). >> + * is set to metric from route (IPv4/IPv6 only), and ifindex >> + * is set to the device index of the nexthop from the FIB lookup. >> * >> * *plen* argument is the size of the passed in struct. >> * *flags* argument can be a combination of one or more of the >> @@ -1873,9 +1874,10 @@ union bpf_attr { >> * *ctx* is either **struct xdp_md** for XDP programs or >> * **struct sk_buff** tc cls_act programs. >> * Return >> - * Egress device index on success, 0 if packet needs to continue >> - * up the stack for further processing or a negative error in case >> - * of failure. >> + * * < 0 if any input argument is invalid >> + * * 0 on success (packet is forwarded, nexthop neighbor exists) >> + * * > 0 one of **BPF_FIB_LKUP_RET_** codes explaining why the >> + * * packet is not forwarded or needs assist from full stack >> * >> * int bpf_sock_hash_update(struct bpf_sock_ops_kern *skops, struct bpf_map *map, void *key, u64 flags) >> * Description >> @@ -2612,6 +2614,18 @@ struct bpf_raw_tracepoint_args { >> #define BPF_FIB_LOOKUP_DIRECT BIT(0) >> #define BPF_FIB_LOOKUP_OUTPUT BIT(1) >> >> +enum { >> + BPF_FIB_LKUP_RET_SUCCESS, /* lookup successful */ >> + BPF_FIB_LKUP_RET_BLACKHOLE, /* dest is blackholed; can be dropped */ >> + BPF_FIB_LKUP_RET_UNREACHABLE, /* dest is unreachable; can be dropped */ >> + BPF_FIB_LKUP_RET_PROHIBIT, /* dest not allowed; can be dropped */ >> + BPF_FIB_LKUP_RET_NOT_FWDED, /* packet is not forwarded */ >> + BPF_FIB_LKUP_RET_FWD_DISABLED, /* fwding is not enabled on ingress */ >> + BPF_FIB_LKUP_RET_UNSUPP_LWT, /* fwd requires encapsulation */ >> + BPF_FIB_LKUP_RET_NO_NEIGH, /* no neighbor entry for nh */ >> + BPF_FIB_LKUP_RET_FRAG_NEEDED, /* fragmentation required to fwd */ >> +}; >> + >> struct bpf_fib_lookup { >> /* input: network family for lookup (AF_INET, AF_INET6) >> * output: network family of egress nexthop >> @@ -2625,7 +2639,11 @@ struct bpf_fib_lookup { >> >> /* total length of packet from network header - used for MTU check */ >> __u16 tot_len; >> - __u32 ifindex; /* L3 device index for lookup */ >> + >> + /* input: L3 device index for lookup >> + * output: device index from FIB lookup >> + */ >> + __u32 ifindex; >> >> union { >> /* inputs to lookup */ >> > > This has been updated in the bpf-next tree already, see commit > 9b8ca3795199 ("tools: bpf: synchronise BPF UAPI header with tools"). > > Best regards, > Quentin >
OK ! Thanks.
-- Thanks, Taeung
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