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bpf: call verify_insn from its callback in struct bpf_offload_dev 

We intend to remove the dev_ops in struct bpf_prog_offload, and to only
keep the ops in struct bpf_offload_dev instead, which is accessible from
more locations for passing function pointers.

But dev_ops is used for calling the verify_insn hook. Switch to the
newly added ops in struct bpf_prog_offload instead.

To avoid table lookups for each eBPF instruction to verify, we remember
the offdev attached to a netdev and modify bpf_offload_find_netdev() to
avoid performing more than once a lookup for a given offload object.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Quentin Monnet 2018-11-09 13:03:26 +00:00 committed by Alexei Starovoitov
parent 1385d755cf
commit 341b3e7b7b
2 changed files with 4 additions and 1 deletions
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1
include/linux/bpf.h
View File

@ -273,6 +273,7 @@ struct bpf_prog_offload_ops {
struct bpf_prog_offload {
struct bpf_prog *prog;
struct net_device *netdev;
struct bpf_offload_dev *offdev;
void *dev_priv;
struct list_head offloads;
bool dev_state;

4
kernel/bpf/offload.c
View File

@ -107,6 +107,7 @@ int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr)
err = -EINVAL;
goto err_unlock;
}
offload->offdev = ondev->offdev;
prog->aux->offload = offload;
list_add_tail(&offload->offloads, &ondev->progs);
dev_put(offload->netdev);
@ -167,7 +168,8 @@ int bpf_prog_offload_verify_insn(struct bpf_verifier_env *env,
down_read(&bpf_devs_lock);
offload = env->prog->aux->offload;
if (offload)
ret = offload->dev_ops->insn_hook(env, insn_idx, prev_insn_idx);
ret = offload->offdev->ops->insn_hook(env, insn_idx,
prev_insn_idx);
up_read(&bpf_devs_lock);
return ret;