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bpf: report offload info to user space

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Extend struct bpf_prog_info to contain information about program
being bound to a device.  Since the netdev may get destroyed while
program still exists we need a flag to indicate the program is
loaded for a device, even if the device is gone.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-11-03 13:56:18 -07:00 committed by David S. Miller
parent ab3f0063c4
commit bd601b6ada
4 changed files with 24 additions and 0 deletions
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1
include/linux/bpf.h
View File

@ -506,6 +506,7 @@ static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
int bpf_prog_offload_compile(struct bpf_prog *prog);
void bpf_prog_offload_destroy(struct bpf_prog *prog);
u32 bpf_prog_offload_ifindex(struct bpf_prog *prog);
#if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);

6
include/uapi/linux/bpf.h
View File

@ -895,6 +895,10 @@ enum sk_action {
#define BPF_TAG_SIZE 8
enum bpf_prog_status {
BPF_PROG_STATUS_DEV_BOUND = (1 << 0),
};
struct bpf_prog_info {
__u32 type;
__u32 id;
@ -908,6 +912,8 @@ struct bpf_prog_info {
__u32 nr_map_ids;
__aligned_u64 map_ids;
char name[BPF_OBJ_NAME_LEN];
__u32 ifindex;
__u32 status;
} __attribute__((aligned(8)));
struct bpf_map_info {

12
kernel/bpf/offload.c
View File

@ -144,6 +144,18 @@ int bpf_prog_offload_compile(struct bpf_prog *prog)
return bpf_prog_offload_translate(prog);
}
u32 bpf_prog_offload_ifindex(struct bpf_prog *prog)
{
struct bpf_dev_offload *offload = prog->aux->offload;
u32 ifindex;
rtnl_lock();
ifindex = offload->netdev ? offload->netdev->ifindex : 0;
rtnl_unlock();
return ifindex;
}
const struct bpf_prog_ops bpf_offload_prog_ops = {
};

5
kernel/bpf/syscall.c
View File

@ -1592,6 +1592,11 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
return -EFAULT;
}
if (bpf_prog_is_dev_bound(prog->aux)) {
info.status |= BPF_PROG_STATUS_DEV_BOUND;
info.ifindex = bpf_prog_offload_ifindex(prog);
}
done:
if (copy_to_user(uinfo, &info, info_len) ||
put_user(info_len, &uattr->info.info_len))