netdev - [RFC PATCH 4/7] net: add tc offload feature flag

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Message-ID: <20160201015100.13871.43218.stgit@john-Precision-Tower-5810>
Date:	Sun, 31 Jan 2016 17:51:00 -0800
From:	John Fastabend <john.fastabend@...il.com>
To:	anjali.singhai@...el.com, jesse.brandeburg@...el.com,
	jhs@...atatu.com
Cc:	ast@...com, donald.c.skidmore@...el.com, horms@...ge.net.au,
	netdev@...r.kernel.org, tgraf@...g.ch, davem@...emloft.net
Subject: [RFC PATCH 4/7] net: add tc offload feature flag

Its useful to turn off the qdisc offload feature at a per device
level. This gives us a big hammer to enable/disable offloading.
More fine grained control (i.e. per rule) may be supported later.

Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
---
 include/linux/netdev_features.h |    3 +++
 net/core/ethtool.c              |    1 +
 2 files changed, 4 insertions(+)

diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
index d9654f0e..a734bf4 100644
--- a/include/linux/netdev_features.h
+++ b/include/linux/netdev_features.h
@@ -67,6 +67,8 @@ enum {
 	NETIF_F_HW_L2FW_DOFFLOAD_BIT,	/* Allow L2 Forwarding in Hardware */
 	NETIF_F_BUSY_POLL_BIT,		/* Busy poll */
 
+	NETIF_F_HW_TC_BIT,		/* Offload TC infrastructure */
+
 	/*
 	 * Add your fresh new feature above and remember to update
 	 * netdev_features_strings[] in net/core/ethtool.c and maybe
@@ -124,6 +126,7 @@ enum {
 #define NETIF_F_HW_VLAN_STAG_TX	__NETIF_F(HW_VLAN_STAG_TX)
 #define NETIF_F_HW_L2FW_DOFFLOAD	__NETIF_F(HW_L2FW_DOFFLOAD)
 #define NETIF_F_BUSY_POLL	__NETIF_F(BUSY_POLL)
+#define NETIF_F_HW_TC		__NETIF_F(HW_TC)
 
 #define for_each_netdev_feature(mask_addr, bit)	\
 	for_each_set_bit(bit, (unsigned long *)mask_addr, NETDEV_FEATURE_COUNT)
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 09948a7..bd8e157a 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -98,6 +98,7 @@ static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN]
 	[NETIF_F_RXALL_BIT] =            "rx-all",
 	[NETIF_F_HW_L2FW_DOFFLOAD_BIT] = "l2-fwd-offload",
 	[NETIF_F_BUSY_POLL_BIT] =        "busy-poll",
+	[NETIF_F_HW_TC_BIT] =		 "hw-tc-offload",
 };
 
 static const char