linux-kernel - [PATCH 5.4 139/388] iavf: use tc_cls_can_offload_and

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Date:   Tue, 29 Sep 2020 12:57:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiri Pirko <jiri@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 139/388] iavf: use tc_cls_can_offload_and_chain0() instead of chain check

From: Jiri Pirko <jiri@...lanox.com>

[ Upstream commit bb0858d8bc828ebc3eaa90be02a0f32bca3c2351 ]

Looks like the iavf code actually experienced a race condition, when a
developer took code before the check for chain 0 was put to helper.
So use tc_cls_can_offload_and_chain0() helper instead of direct check and
move the check to _cb() so this is similar to i40e code.

Signed-off-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 34124c213d27c..222ae76809aa1 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -3077,9 +3077,6 @@ static int iavf_delete_clsflower(struct iavf_adapter *adapter,
 static int iavf_setup_tc_cls_flower(struct iavf_adapter *adapter,
 				    struct flow_cls_offload *cls_flower)
 {
-	if (cls_flower->common.chain_index)
-		return -EOPNOTSUPP;
-
 	switch (cls_flower->command) {
 	case FLOW_CLS_REPLACE:
 		return iavf_configure_clsflower(adapter, cls_flower);
@@ -3103,6 +3100,11 @@ static int iavf_setup_tc_cls_flower(struct iavf_adapter *adapter,
 static int iavf_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
 				  void *cb_priv)
 {
+	struct iavf_adapter *adapter = cb_priv;
+
+	if (!tc_cls_can_offload_and_chain0(adapter->netdev, type_data))
+		return -EOPNOTSUPP;
+
 	switch (type) {
 	case TC_SETUP_CLSFLOWER:
 		return iavf_setup_tc_cls_flower(cb_priv, type_data);
-- 
2.25.1