netdev - [net-next PATCH v3 2/3] net: cls_u32: move TC offload feature bit into cls

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Date:	Fri, 26 Feb 2016 07:54:13 -0800
From:	John Fastabend <john.fastabend@...il.com>
To:	jiri@...nulli.us, john.fastabend@...il.com, daniel@...earbox.net,
	simon.horman@...ronome.com
Cc:	netdev@...r.kernel.org, alexei.starovoitov@...il.com,
	davem@...emloft.net, jhs@...atatu.com
Subject: [net-next PATCH v3 2/3] net: cls_u32: move TC offload feature bit
 into cls_u32 offload logic

In the original series drivers would get offload requests for cls_u32
rules even if the feature bit is disabled. This meant the driver had
to do a boiler plate check on the feature bit before adding/deleting
the rule.

This patch lifts the check into the core code and removes it from the
driver specific case.

Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |    3 ---
 include/net/pkt_cls.h                         |    3 +++
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index cf4b729..b893ff8 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -8400,9 +8400,6 @@ int __ixgbe_setup_tc(struct net_device *dev, u32 handle, __be16 proto,
 
 	if (TC_H_MAJ(handle) == TC_H_MAJ(TC_H_INGRESS) &&
 	    tc->type == TC_SETUP_CLSU32) {
-		if (!(dev->features & NETIF_F_HW_TC))
-			return -EINVAL;
-
 		switch (tc->cls_u32->command) {
 		case TC_CLSU32_NEW_KNODE:
 		case TC_CLSU32_REPLACE_KNODE:
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index e64d20b..6096e96 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -394,6 +394,9 @@ struct tc_cls_u32_offload {
 
 static inline bool tc_should_offload(struct net_device *dev)
 {
+	if (!(dev->features & NETIF_F_HW_TC))
+		return false;
+
 	return dev->netdev_ops->ndo_setup_tc;
 }