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bpf: Introduce device-bound XDP programs

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New flag BPF_F_XDP_DEV_BOUND_ONLY plus all the infra to have a way
to associate a netdev with a BPF program at load time.

netdevsim checks are dropped in favor of generic check in dev_xdp_attach.

Cc: John Fastabend <john.fastabend@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Anatoly Burakov <anatoly.burakov@intel.com>
Cc: Alexander Lobakin <alexandr.lobakin@intel.com>
Cc: Magnus Karlsson <magnus.karlsson@gmail.com>
Cc: Maryam Tahhan <mtahhan@redhat.com>
Cc: xdp-hints@xdp-project.net
Cc: netdev@vger.kernel.org
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20230119221536.3349901-6-sdf@google.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Stanislav Fomichev 2023-01-19 14:15:24 -08:00 • committed by Martin KaFai Lau
parent 89bbc53a4d
commit 2b3486bc2d
8 changed files with 113 additions and 38 deletions
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24
include/linux/bpf.h
View file

@ -1261,7 +1261,8 @@ struct bpf_prog_aux {
enum bpf_prog_type saved_dst_prog_type;
enum bpf_attach_type saved_dst_attach_type;
bool verifier_zext; /* Zero extensions has been inserted by verifier. */
bool offload_requested;
bool dev_bound; /* Program is bound to the netdev. */
bool offload_requested; /* Program is bound and offloaded to the netdev. */
bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
bool func_proto_unreliable;
bool sleepable;
@ -2451,7 +2452,7 @@ void __bpf_free_used_maps(struct bpf_prog_aux *aux,
bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
int bpf_prog_offload_compile(struct bpf_prog *prog);
void bpf_prog_offload_destroy(struct bpf_prog *prog);
void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);
int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
struct bpf_prog *prog);
@ -2479,7 +2480,13 @@ bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
void unpriv_ebpf_notify(int new_state);
#if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
void bpf_dev_bound_netdev_unregister(struct net_device *dev);
static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
{
return aux->dev_bound;
}
static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
{
@ -2507,12 +2514,21 @@ void sock_map_unhash(struct sock *sk);
void sock_map_destroy(struct sock *sk);
void sock_map_close(struct sock *sk, long timeout);
#else
static inline int bpf_prog_offload_init(struct bpf_prog *prog,
static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
union bpf_attr *attr)
{
return -EOPNOTSUPP;
}
static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
{
}
static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
{
return false;
}
static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
{
return false;