diff mbox series

[Openvpn-devel,RFC,net-next,v4,7/9] ovpn: prefetch GSO segments before in-place encryption

Message ID d085dda71a91670680cbaee1029a37d952338c35.1789558856.git.ralf@mandelbit.com
State New
Headers
Series ovpn: preserve GSO and GRO batching |

Commit Message

Ralf Lici Sept. 16, 2026, 11:46 a.m. UTC 
  Software segmentation exposes the complete skb list before encryption
begins. While encrypting each segment, request write ownership of the
next linear segment cache line by cache line. A single skb naturally
skips the prefetch path.

Signed-off-by: Ralf Lici <ralf@mandelbit.com>
---
No changes since v3 https://lore.kernel.org/openvpn-devel/cc6cda4eb421a6c1ba12da441256b4dfb8438c12.1789546917.git.ralf@mandelbit.com/

No changes since v2 https://lore.kernel.org/openvpn-devel/3f903692549ee58887b1bb421f8b283059f66a1d.1789540779.git.ralf@mandelbit.com/

No changes since v1 https://lore.kernel.org/openvpn-devel/382879c187b1acca65198c467d1263266243ea50.1789485693.git.ralf@mandelbit.com/

 drivers/net/ovpn/io.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/ovpn/io.c b/drivers/net/ovpn/io.c
index 11f7f16d7b79..cb7503a3e79c 100644
--- a/drivers/net/ovpn/io.c
+++ b/drivers/net/ovpn/io.c
@@ -472,6 +472,12 @@  static void ovpn_send(struct ovpn_priv *ovpn, struct sk_buff *skb,
 	 * independently
 	 */
 	skb_list_walk_safe(skb, curr, next) {
+		/* encrypting this segment can hide the cost of fetching the
+		 * next segment's data into the cache
+		 */
+		if (next)
+			ovpn_skb_prefetchw(next);
+
 		if (unlikely(!ovpn_encrypt_one(peer, curr))) {
 			ovpn_dev_dstats_tx_dropped(ovpn->dev, 1);
 			kfree_skb(curr);