netdev - [PATCH xfrm-next 4/9] xfrm: add new device offload acquire flag

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Message-Id: <f5da0834d8c6b82ab9ba38bd4a0c55e71f0e3dab.1678714336.git.leon@kernel.org>
Date:   Tue, 14 Mar 2023 10:58:39 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Steffen Klassert <steffen.klassert@...unet.com>
Cc:     Raed Salem <raeds@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Paolo Abeni <pabeni@...hat.com>,
        Paul Blakey <paulb@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [PATCH xfrm-next 4/9] xfrm: add new device offload acquire flag

From: Raed Salem <raeds@...dia.com>

During XFRM acquire flow, a default SA is created to be updated later,
once acquire netlink message is handled in user space. When the relevant
policy is offloaded this default SA is also offloaded to IPsec offload
supporting driver, however this SA does not have context suitable for
offloading in HW, nor is interesting to offload to HW, consequently needs
a special driver handling apart from other offloaded SA(s).
Add a special flag that marks such SA so driver can handle it correctly.

Signed-off-by: Raed Salem <raeds@...dia.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 include/net/xfrm.h    | 5 +++++
 net/xfrm/xfrm_state.c | 1 +
 2 files changed, 6 insertions(+)

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 3e1f70e8e424..33ee3f5936e6 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -138,6 +138,10 @@ enum {
 	XFRM_DEV_OFFLOAD_PACKET,
 };
 
+enum {
+	XFRM_DEV_OFFLOAD_FLAG_ACQ = 1,
+};
+
 struct xfrm_dev_offload {
 	struct net_device	*dev;
 	netdevice_tracker	dev_tracker;
@@ -145,6 +149,7 @@ struct xfrm_dev_offload {
 	unsigned long		offload_handle;
 	u8			dir : 2;
 	u8			type : 2;
+	u8			flags : 2;
 };
 
 struct xfrm_mode {
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 2ab3e09e2227..7cca0a1fa5ff 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -1272,6 +1272,7 @@ xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 			xso->dir = xdo->dir;
 			xso->dev = xdo->dev;
 			xso->real_dev = xdo->real_dev;
+			xso->flags = XFRM_DEV_OFFLOAD_FLAG_ACQ;
 			netdev_tracker_alloc(xso->dev, &xso->dev_tracker,
 					     GFP_ATOMIC);
 			error = xso->dev->xfrmdev_ops->xdo_dev_state_add(x, NULL);
-- 
2.39.2