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bpf: xdp: allow offloads to store into rx_queue_index 

It's fairly easy for offloaded XDP programs to select the RX queue
packets go to.  We need a way of expressing this in the software.
Allow write to the rx_queue_index field of struct xdp_md for
device-bound programs.

Skip convert_ctx_access callback entirely for offloads.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2018-05-08 19:37:06 -07:00 committed by Daniel Borkmann
parent a1d1f07935
commit 0d83003256
3 changed files with 10 additions and 3 deletions
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2
include/linux/bpf.h
View File

@ -627,7 +627,7 @@ bool bpf_offload_dev_match(struct bpf_prog *prog, struct bpf_map *map);
#if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
{
return aux->offload_requested;
}

2
kernel/bpf/verifier.c
View File

@ -5215,7 +5215,7 @@ static int convert_ctx_accesses(struct bpf_verifier_env *env)
}
}
if (!ops->convert_ctx_access)
if (!ops->convert_ctx_access || bpf_prog_is_dev_bound(env->prog->aux))
return 0;
insn = env->prog->insnsi + delta;

9
net/core/filter.c
View File

@ -4645,8 +4645,15 @@ static bool xdp_is_valid_access(int off, int size,
const struct bpf_prog *prog,
struct bpf_insn_access_aux *info)
{
if (type == BPF_WRITE)
if (type == BPF_WRITE) {
if (bpf_prog_is_dev_bound(prog->aux)) {
switch (off) {
case offsetof(struct xdp_md, rx_queue_index):
return __is_valid_xdp_access(off, size);
}
}
return false;
}
switch (off) {
case offsetof(struct xdp_md, data):