diff mbox series

[bpf,2/5] bpf: sockmap, added comments describing update proto rules

Message ID 20231221232327.43678-3-john.fastabend@gmail.com (mailing list archive)
State Accepted
Commit 7865dfb1eb941ddd25802a9e13b6ff5f3f4dc02f
Delegated to: BPF
Headers show
Series fix sockmap + stream af_unix memleak | expand

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netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1181 this patch: 1181
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 11 lines checked
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Commit Message

John Fastabend Dec. 21, 2023, 11:23 p.m. UTC 
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>
---
 include/linux/skmsg.h | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/skmsg.h b/include/linux/skmsg.h
index c953b8c0d2f4..888a4b217829 100644
--- a/include/linux/skmsg.h
+++ b/include/linux/skmsg.h
@@ -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;