netdev - [PATCH RFC ipsec-next 2/2] xfrm: Add a dummy network device for napi.

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Message-ID: <1485501572-20908-3-git-send-email-steffen.klassert@secunet.com>
Date:   Fri, 27 Jan 2017 08:19:32 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     <netdev@...r.kernel.org>, Eric Dumazet <eric.dumazet@...il.com>,
        "David Miller" <davem@...emloft.net>
CC:     Steffen Klassert <steffen.klassert@...unet.com>,
        Sowmini Varadhan <sowmini.varadhan@...cle.com>,
        Ilan Tayari <ilant@...lanox.com>
Subject: [PATCH RFC ipsec-next 2/2] xfrm: Add a dummy network device for napi.

This patch adds a dummy network device so that we can
use gro_cells for IPsec GRO. With this, we handle IPsec
GRO with no impact on the generic networking code.

Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 net/xfrm/xfrm_input.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 6e3f025..3213fe8 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -21,6 +21,9 @@
 static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
 static struct xfrm_input_afinfo __rcu *xfrm_input_afinfo[NPROTO];
 
+static struct gro_cells gro_cells;
+static struct net_device xfrm_napi_dev;
+
 int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo)
 {
 	int err = 0;
@@ -371,7 +374,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
 
 	if (decaps) {
 		skb_dst_drop(skb);
-		netif_rx(skb);
+		gro_cells_receive(&gro_cells, skb);
 		return 0;
 	} else {
 		return x->inner_mode->afinfo->transport_finish(skb, async);
@@ -394,6 +397,13 @@ int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
 
 void __init xfrm_input_init(void)
 {
+	int err;
+
+	init_dummy_netdev(&xfrm_napi_dev);
+	err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
+	if (err)
+		gro_cells.cells = NULL;
+
 	secpath_cachep = kmem_cache_create("secpath_cache",
 					   sizeof(struct sec_path),
 					   0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
-- 
1.9.1