linux-kernel - [RFC PATCH 7/7] tun: report new tun feature IFF

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Date:   Tue,  5 Jan 2021 14:24:16 +0200
From:   Yuri Benditovich <yuri.benditovich@...nix.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     yan@...nix.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 7/7] tun: report new tun feature IFF_HASH

IFF_HASH feature indicates that the tun supports
TUNSETHASHPOPULATION ioctl and can propagate the hash
data to the virtio-net packet.

Signed-off-by: Yuri Benditovich <yuri.benditovich@...nix.com>
---
 drivers/net/tun.c           | 2 +-
 include/uapi/linux/if_tun.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 214feb0b16fb..b46aa8941a9d 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -88,7 +88,7 @@ static void tun_default_link_ksettings(struct net_device *dev,
 #define TUN_VNET_LE     0x80000000
 #define TUN_VNET_BE     0x40000000
 
-#define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \
+#define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | IFF_HASH |\
 		      IFF_MULTI_QUEUE | IFF_NAPI | IFF_NAPI_FRAGS)
 
 #define GOODCOPY_LEN 128
diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
index 0fd43533da26..116b84ede3a0 100644
--- a/include/uapi/linux/if_tun.h
+++ b/include/uapi/linux/if_tun.h
@@ -73,6 +73,7 @@
 #define IFF_ONE_QUEUE	0x2000
 #define IFF_VNET_HDR	0x4000
 #define IFF_TUN_EXCL	0x8000
+#define IFF_HASH	0x0080
 #define IFF_MULTI_QUEUE 0x0100
 #define IFF_ATTACH_QUEUE 0x0200
 #define IFF_DETACH_QUEUE 0x0400
-- 
2.17.1