When drivers call netif_napi_add_weight with a weight that is larger
than NAPI_POLL_WEIGHT, the networking code allows the larger weight, but
prints an error.
Replicate this check for SO_BUSY_POLL_BUDGET; check if the user
specified amount exceeds NAPI_POLL_WEIGHT, allow it anyway, but print an
error.
Signed-off-by: Joe Damato <jdamato@xxxxxxxxxx>
---
net/core/sock.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/core/sock.c b/net/core/sock.c
index 158dbdebce6a..ed243bd0dd77 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1153,6 +1153,9 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
return -EPERM;
if (val < 0 || val > U16_MAX)
return -EINVAL;
+ if (val > NAPI_POLL_WEIGHT)
+ pr_err("SO_BUSY_POLL_BUDGET %u exceeds suggested maximum %u\n", val,
+ NAPI_POLL_WEIGHT);
WRITE_ONCE(sk->sk_busy_poll_budget, val);
return 0;
#endif
--
2.25.1
