netdev - [RFC PATCH 1/5] uapi/linux/if_tun.h: Added new ioctl for tun/tap.

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Message-Id: <20220125084702.3636253-2-andrew@daynix.com>
Date:   Tue, 25 Jan 2022 10:46:58 +0200
From:   Andrew Melnychenko <andrew@...nix.com>
To:     davem@...emloft.net, kuba@...nel.org, mst@...hat.com,
        jasowang@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Cc:     yuri.benditovich@...nix.com, yan@...nix.com
Subject: [RFC PATCH 1/5] uapi/linux/if_tun.h: Added new ioctl for tun/tap.

Added TUNGETSUPPORTEDOFFLOADS that should allow
to get bits of supported offloads.
Added 2 additional offlloads for USO(IPv4 & IPv6).
Separate offloads are required for Windows VM guests,
g.e. Windows may set USO rx only for IPv4.

Signed-off-by: Andrew Melnychenko <andrew@...nix.com>
---
 include/uapi/linux/if_tun.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
index 454ae31b93c7..07680fae6e18 100644
--- a/include/uapi/linux/if_tun.h
+++ b/include/uapi/linux/if_tun.h
@@ -61,6 +61,7 @@
 #define TUNSETFILTEREBPF _IOR('T', 225, int)
 #define TUNSETCARRIER _IOW('T', 226, int)
 #define TUNGETDEVNETNS _IO('T', 227)
+#define TUNGETSUPPORTEDOFFLOADS _IOR('T', 228, unsigned int)
 
 /* TUNSETIFF ifr flags */
 #define IFF_TUN		0x0001
@@ -88,6 +89,8 @@
 #define TUN_F_TSO6	0x04	/* I can handle TSO for IPv6 packets */
 #define TUN_F_TSO_ECN	0x08	/* I can handle TSO with ECN bits. */
 #define TUN_F_UFO	0x10	/* I can handle UFO packets */
+#define TUN_F_USO4	0x20	/* I can handle USO for IPv4 packets */
+#define TUN_F_USO6	0x40	/* I can handle USO for IPv6 packets */
 
 /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
 #define TUN_PKT_STRIP	0x0001
-- 
2.34.1