netdev - [PATCH net-next v6 2/9] vsock: add net to vsock skb cb

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Message-Id: <20250916-vsock-vmtest-v6-2-064d2eb0c89d@meta.com>
Date: Tue, 16 Sep 2025 16:43:46 -0700
From: Bobby Eshleman <bobbyeshleman@...il.com>
To: Stefano Garzarella <sgarzare@...hat.com>, Shuah Khan <shuah@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, Stefan Hajnoczi <stefanha@...hat.com>, 
 "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
 Eugenio Pérez <eperezma@...hat.com>, 
 "K. Y. Srinivasan" <kys@...rosoft.com>, 
 Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, 
 Dexuan Cui <decui@...rosoft.com>, Bryan Tan <bryan-bt.tan@...adcom.com>, 
 Vishnu Dasa <vishnu.dasa@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>
Cc: virtualization@...ts.linux.dev, netdev@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org, 
 kvm@...r.kernel.org, linux-hyperv@...r.kernel.org, 
 Bobby Eshleman <bobbyeshleman@...il.com>, berrange@...hat.com, 
 Bobby Eshleman <bobbyeshleman@...a.com>
Subject: [PATCH net-next v6 2/9] vsock: add net to vsock skb cb

From: Bobby Eshleman <bobbyeshleman@...a.com>

Add a net pointer and orig_net_mode to the vsock skb and helpers for
getting/setting them.  This is in preparation for adding vsock NS
support.

Signed-off-by: Bobby Eshleman <bobbyeshleman@...a.com>

---
Changes in v5:
- some diff context change due to rebase to current net-next
---
 include/linux/virtio_vsock.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
index 0c67543a45c8..ea955892488a 100644
--- a/include/linux/virtio_vsock.h
+++ b/include/linux/virtio_vsock.h
@@ -13,6 +13,8 @@ struct virtio_vsock_skb_cb {
 	bool reply;
 	bool tap_delivered;
 	u32 offset;
+	struct net *net;
+	enum vsock_net_mode orig_net_mode;
 };

 #define VIRTIO_VSOCK_SKB_CB(skb) ((struct virtio_vsock_skb_cb *)((skb)->cb))
@@ -130,6 +132,27 @@ static inline size_t virtio_vsock_skb_len(struct sk_buff *skb)
 	return (size_t)(skb_end_pointer(skb) - skb->head);
 }

+static inline struct net *virtio_vsock_skb_net(struct sk_buff *skb)
+{
+	return VIRTIO_VSOCK_SKB_CB(skb)->net;
+}
+
+static inline void virtio_vsock_skb_set_net(struct sk_buff *skb, struct net *net)
+{
+	VIRTIO_VSOCK_SKB_CB(skb)->net = net;
+}
+
+static inline enum vsock_net_mode virtio_vsock_skb_orig_net_mode(struct sk_buff *skb)
+{
+	return VIRTIO_VSOCK_SKB_CB(skb)->orig_net_mode;
+}
+
+static inline void virtio_vsock_skb_set_orig_net_mode(struct sk_buff *skb,
+						      enum vsock_net_mode orig_net_mode)
+{
+	VIRTIO_VSOCK_SKB_CB(skb)->orig_net_mode = orig_net_mode;
+}
+
 /* Dimension the RX SKB so that the entire thing fits exactly into
  * a single 4KiB page. This avoids wasting memory due to alloc_skb()
  * rounding up to the next page order and also means that we

-- 
2.47.3