netdev - [PATCH net-next 1/2] net: introduce UDP GRO netdev feature

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Date:   Mon, 18 Jan 2021 19:32:51 +0000
From:   Alexander Lobakin <alobakin@...me>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexander Lobakin <alobakin@...me>,
        Igor Russkikh <irusskikh@...vell.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Antoine Tenart <atenart@...nel.org>,
        Michal Kubecek <mkubecek@...e.cz>,
        Andrew Lunn <andrew@...n.ch>,
        Meir Lichtinger <meirl@...lanox.com>,
        Aya Levin <ayal@...lanox.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH net-next 1/2] net: introduce UDP GRO netdev feature

Introduce a new netdev_feature, NETIF_F_GRO_UDP, to allow user
to turn UDP GRO on and off when there is no socket, e.g. when
forwarding.
Defaults to off to not change current datapath.

Suggested-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Alexander Lobakin <alobakin@...me>
---
 include/linux/netdev_features.h | 4 +++-
 net/ethtool/common.c            | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
index 934de56644e7..c6526aa13684 100644
--- a/include/linux/netdev_features.h
+++ b/include/linux/netdev_features.h
@@ -84,6 +84,7 @@ enum {
 	NETIF_F_GRO_FRAGLIST_BIT,	/* Fraglist GRO */
 
 	NETIF_F_HW_MACSEC_BIT,		/* Offload MACsec operations */
+	NETIF_F_GRO_UDP_BIT,		/* Enable UDP GRO */
 
 	/*
 	 * Add your fresh new feature above and remember to update
@@ -157,6 +158,7 @@ enum {
 #define NETIF_F_GRO_FRAGLIST	__NETIF_F(GRO_FRAGLIST)
 #define NETIF_F_GSO_FRAGLIST	__NETIF_F(GSO_FRAGLIST)
 #define NETIF_F_HW_MACSEC	__NETIF_F(HW_MACSEC)
+#define NETIF_F_GRO_UDP		__NETIF_F(GRO_UDP)
 
 /* Finds the next feature with the highest number of the range of start till 0.
  */
@@ -234,7 +236,7 @@ static inline int find_next_netdev_feature(u64 feature, unsigned long start)
 #define NETIF_F_SOFT_FEATURES	(NETIF_F_GSO | NETIF_F_GRO)
 
 /* Changeable features with no special hardware requirements that defaults to off. */
-#define NETIF_F_SOFT_FEATURES_OFF	NETIF_F_GRO_FRAGLIST
+#define NETIF_F_SOFT_FEATURES_OFF	(NETIF_F_GRO_FRAGLIST | NETIF_F_GRO_UDP)
 
 #define NETIF_F_VLAN_FEATURES	(NETIF_F_HW_VLAN_CTAG_FILTER | \
 				 NETIF_F_HW_VLAN_CTAG_RX | \
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index 24036e3055a1..e45128882372 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -68,6 +68,7 @@ const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
 	[NETIF_F_HW_TLS_RX_BIT] =	 "tls-hw-rx-offload",
 	[NETIF_F_GRO_FRAGLIST_BIT] =	 "rx-gro-list",
 	[NETIF_F_HW_MACSEC_BIT] =	 "macsec-hw-offload",
+	[NETIF_F_GRO_UDP_BIT] =		 "rx-gro-udp",
 };
 
 const char
-- 
2.30.0