netdev - [PATCH net v2 6/6] bnxt_en: Fix to include flow direction in L2 key

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Date:   Sat, 17 Aug 2019 17:04:52 -0400
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, Somnath Kotur <somnath.kotur@...adcom.com>
Subject: [PATCH net v2 6/6] bnxt_en: Fix to include flow direction in L2 key

From: Somnath Kotur <somnath.kotur@...adcom.com>

FW expects the driver to provide unique flow reference handles
for Tx or Rx flows. When a Tx flow and an Rx flow end up sharing
a reference handle, flow offload does not seem to work.
This could happen in the case of 2 flows having their L2 fields
wildcarded but in different direction.
Fix to incorporate the flow direction as part of the L2 key

v2: Move the dir field to the end of the bnxt_tc_l2_key struct to
fix the warning reported by kbuild test robot <lkp@...el.com>.
There is existing code that initializes the structure using
nested initializer and will warn with the new u8 field added to
the beginning.  The structure also packs nicer when this new u8 is
added to the end of the structure [MChan].

Fixes: abd43a13525d ("bnxt_en: Support for 64-bit flow handle.")
Signed-off-by: Somnath Kotur <somnath.kotur@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c | 4 ++--
 drivers/net/ethernet/broadcom/bnxt/bnxt_tc.h | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
index 6224c30..dd621f6 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
@@ -1236,7 +1236,7 @@ static int __bnxt_tc_del_flow(struct bnxt *bp,
 static void bnxt_tc_set_flow_dir(struct bnxt *bp, struct bnxt_tc_flow *flow,
 				 u16 src_fid)
 {
-	flow->dir = (bp->pf.fw_fid == src_fid) ? BNXT_DIR_RX : BNXT_DIR_TX;
+	flow->l2_key.dir = (bp->pf.fw_fid == src_fid) ? BNXT_DIR_RX : BNXT_DIR_TX;
 }
 
 static void bnxt_tc_set_src_fid(struct bnxt *bp, struct bnxt_tc_flow *flow,
@@ -1405,7 +1405,7 @@ static void bnxt_fill_cfa_stats_req(struct bnxt *bp,
 		 * 2. 15th bit of flow_handle must specify the flow
 		 *    direction (TX/RX).
 		 */
-		if (flow_node->flow.dir == BNXT_DIR_RX)
+		if (flow_node->flow.l2_key.dir == BNXT_DIR_RX)
 			handle = CFA_FLOW_INFO_REQ_FLOW_HANDLE_DIR_RX |
 				 CFA_FLOW_INFO_REQ_FLOW_HANDLE_MAX_MASK;
 		else
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.h
index ffec57d..4f05305 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.h
@@ -23,6 +23,9 @@ struct bnxt_tc_l2_key {
 	__be16		inner_vlan_tci;
 	__be16		ether_type;
 	u8		num_vlans;
+	u8		dir;
+#define BNXT_DIR_RX	1
+#define BNXT_DIR_TX	0
 };
 
 struct bnxt_tc_l3_key {
@@ -98,9 +101,6 @@ struct bnxt_tc_flow {
 
 	/* flow applicable to pkts ingressing on this fid */
 	u16				src_fid;
-	u8				dir;
-#define BNXT_DIR_RX	1
-#define BNXT_DIR_TX	0
 	struct bnxt_tc_l2_key		l2_key;
 	struct bnxt_tc_l2_key		l2_mask;
 	struct bnxt_tc_l3_key		l3_key;
-- 
2.5.1