Merge branch 'tls-rx-nopad-and-backlog-flushing'

Jakub Kicinski says:

====================
tls: rx: nopad and backlog flushing

This small series contains the two changes I've been working
towards in the previous ~50 patches a couple of months ago.

The first major change is the optional "nopad" optimization.
Currently TLS 1.3 Rx performs quite poorly because it does
not support the "zero-copy" or rather direct decrypt to a user
space buffer. Because of TLS 1.3 record padding we don't
know if a record contains data or a control message until
we decrypt it. Most records will contain data, tho, so the
optimization is to try the decryption hoping its data and
retry if it wasn't.

The performance gain from doing that is significant (~40%)
but if I'm completely honest the major reason is that we
call skb_cow_data() on the non-"zc" path. The next series
will remove the CoW, dropping the gain to only ~10%.

The second change is to flush the backlog every 128kB.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/sockptr.h b/include/linux/sockptr.h
index ea193414298b..d45902fb4cad 100644
--- a/include/linux/sockptr.h
+++ b/include/linux/sockptr.h
@@ -102,4 +102,12 @@ static inline long strncpy_from_sockptr(char *dst, sockptr_t src, size_t count)
 	return strncpy_from_user(dst, src.user, count);
 }
 
+static inline int check_zeroed_sockptr(sockptr_t src, size_t offset,
+				       size_t size)
+{
+	if (!sockptr_is_kernel(src))
+		return check_zeroed_user(src.user + offset, size);
+	return memchr_inv(src.kernel + offset, 0, size) == NULL;
+}
+
 #endif /* _LINUX_SOCKPTR_H */