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authorJohn Fastabend <john.fastabend@gmail.com>2023-12-22 02:23:24 +0300
committerMartin KaFai Lau <martin.lau@kernel.org>2024-01-04 03:50:16 +0300
commit7865dfb1eb941ddd25802a9e13b6ff5f3f4dc02f (patch)
tree80e1650f741a44c94e7ed22c15545aa603839b8f /include/linux/skmsg.h
parent16b2f264983dc264c1560cc0170e760dec1bf54f (diff)
downloadlinux-7865dfb1eb941ddd25802a9e13b6ff5f3f4dc02f.tar.xz
bpf: sockmap, added comments describing update proto rules
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
Diffstat (limited to 'include/linux/skmsg.h')
-rw-r--r--include/linux/skmsg.h5
1 files changed, 5 insertions, 0 deletions
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;