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bpf, xdp: Start using the BPF dispatcher for XDP

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This commit adds a BPF dispatcher for XDP. The dispatcher is updated
from the XDP control-path, dev_xdp_install(), and used when an XDP
program is run via bpf_prog_run_xdp().

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191213175112.30208-4-bjorn.topel@gmail.com
This commit is contained in:
Björn Töpel 2019-12-13 18:51:09 +01:00 • committed by Alexei Starovoitov
parent 75ccbef636
commit 7e6897f959
5 changed files with 83 additions and 25 deletions
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15
include/linux/bpf.h
View file

@ -488,6 +488,14 @@ struct bpf_dispatcher {
u32 image_off;
};
static __always_inline unsigned int bpf_dispatcher_nopfunc(
const void *ctx,
const struct bpf_insn *insnsi,
unsigned int (*bpf_func)(const void *,
const struct bpf_insn *))
{
return bpf_func(ctx, insnsi);
}
#ifdef CONFIG_BPF_JIT
struct bpf_trampoline *bpf_trampoline_lookup(u64 key);
int bpf_trampoline_link_prog(struct bpf_prog *prog);
@ -997,6 +1005,8 @@ int btf_distill_func_proto(struct bpf_verifier_log *log,
int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog);
struct bpf_prog *bpf_prog_by_id(u32 id);
#else /* !CONFIG_BPF_SYSCALL */
static inline struct bpf_prog *bpf_prog_get(u32 ufd)
{
@ -1128,6 +1138,11 @@ static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
static inline void bpf_map_put(struct bpf_map *map)
{
}
static inline struct bpf_prog *bpf_prog_by_id(u32 id)
{
return ERR_PTR(-ENOTSUPP);
}
#endif /* CONFIG_BPF_SYSCALL */
static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,