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bpf: offload: allow netdev to disappear while verifier is running

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To allow verifier instruction callbacks without any extra locking
NETDEV_UNREGISTER notification would wait on a waitqueue for verifier
to finish.  This design decision was made when rtnl lock was providing
all the locking.  Use the read/write lock instead and remove the
workqueue.

Verifier will now call into the offload code, so dev_ops are moved
to offload structure.  Since verifier calls are all under
bpf_prog_is_dev_bound() we no longer need static inline implementations
to please builds with CONFIG_NET=n.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2017-12-27 18:39:05 -08:00 • committed by Daniel Borkmann
parent 9a18eedb14
commit cae1927c0b
8 changed files with 37 additions and 48 deletions
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9
include/linux/bpf.h
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@ -17,6 +17,7 @@
#include <linux/numa.h>
#include <linux/wait.h>
struct bpf_verifier_env;
struct perf_event;
struct bpf_prog;
struct bpf_map;
@ -184,14 +185,18 @@ struct bpf_verifier_ops {
struct bpf_prog *prog, u32 *target_size);
};
struct bpf_prog_offload_ops {
int (*insn_hook)(struct bpf_verifier_env *env,
int insn_idx, int prev_insn_idx);
};
struct bpf_dev_offload {
struct bpf_prog *prog;
struct net_device *netdev;
void *dev_priv;
struct list_head offloads;
bool dev_state;
bool verifier_running;
wait_queue_head_t verifier_done;
const struct bpf_prog_offload_ops *dev_ops;
};
struct bpf_prog_aux {