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, 2 insertions, 0 deletions

diff --git a/include/uapi/linux/tls.h b/include/uapi/linux/tls.h
index bb8f80812b0b..f1157d8f4acd 100644
--- a/include/uapi/linux/tls.h
+++ b/include/uapi/linux/tls.h
@@ -40,6 +40,7 @@
 #define TLS_TX			1	/* Set transmit parameters */
 #define TLS_RX			2	/* Set receive parameters */
 #define TLS_TX_ZEROCOPY_RO	3	/* TX zerocopy (only sendfile now) */
+#define TLS_RX_EXPECT_NO_PAD	4	/* Attempt opportunistic zero-copy */
 
 /* Supported versions */
 #define TLS_VERSION_MINOR(ver)	((ver) & 0xFF)
@@ -162,6 +163,7 @@ enum {
 	TLS_INFO_TXCONF,
 	TLS_INFO_RXCONF,
 	TLS_INFO_ZC_RO_TX,
+	TLS_INFO_RX_NO_PAD,
 	__TLS_INFO_MAX,
 };
 #define TLS_INFO_MAX (__TLS_INFO_MAX - 1)