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bpf: sockmap, added comments describing update proto rules

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Add a comment describing that the psock update proto callbback can be
called multiple times and this must be safe.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/r/20231221232327.43678-3-john.fastabend@gmail.com
This commit is contained in:
John Fastabend 2023-12-21 15:23:24 -08:00 committed by Martin KaFai Lau
parent 16b2f26498
commit 7865dfb1eb
1 changed files with 5 additions and 0 deletions
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5
include/linux/skmsg.h
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@ -100,6 +100,11 @@ struct sk_psock {
void (*saved_close)(struct sock *sk, long timeout);
void (*saved_write_space)(struct sock *sk);
void (*saved_data_ready)(struct sock *sk);
/* psock_update_sk_prot may be called with restore=false many times
* so the handler must be safe for this case. It will be called
* exactly once with restore=true when the psock is being destroyed
* and psock refcnt is zero, but before an RCU grace period.
*/
int (*psock_update_sk_prot)(struct sock *sk, struct sk_psock *psock,
bool restore);
struct proto *sk_proto;