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Date:	Fri, 30 May 2014 19:06:28 +0530
From:	Sathya Perla <sathya.perla@...lex.com>
To:	<netdev@...r.kernel.org>
Subject: [PATCH net-next v2 6/6] be2net: cleanup MCC async event processing code

The MCC async event processing code has 2 issues:
a) because of long struct names the code indentation is badly broken
b) description and definitions of how an MCC completion is interpreted as
   an async event are confusing (for e.g. the last word of an MCC event is
   named "code", while "code" is just a sub-field of the last word.)

This patch fixes the structure definitions, comments and re-factors code
as needed.

Signed-off-by: Sathya Perla <sathya.perla@...lex.com>
---
 drivers/net/ethernet/emulex/benet/be_cmds.c |  103 ++++++++++++++-------------
 drivers/net/ethernet/emulex/benet/be_cmds.h |   34 ++++-----
 2 files changed, 67 insertions(+), 70 deletions(-)

diff --git a/drivers/net/ethernet/emulex/benet/be_cmds.c b/drivers/net/ethernet/emulex/benet/be_cmds.c
index 0538c0b..a568f7d 100644
--- a/drivers/net/ethernet/emulex/benet/be_cmds.c
+++ b/drivers/net/ethernet/emulex/benet/be_cmds.c
@@ -225,8 +225,11 @@ static int be_mcc_compl_process(struct be_adapter *adapter,
 
 /* Link state evt is a string of bytes; no need for endian swapping */
 static void be_async_link_state_process(struct be_adapter *adapter,
-					struct be_async_event_link_state *evt)
+					struct be_mcc_compl *compl)
 {
+	struct be_async_event_link_state *evt =
+			(struct be_async_event_link_state *)compl;
+
 	/* When link status changes, link speed must be re-queried from FW */
 	adapter->phy.link_speed = -1;
 
@@ -249,10 +252,11 @@ static void be_async_link_state_process(struct be_adapter *adapter,
 
 /* Grp5 CoS Priority evt */
 static void be_async_grp5_cos_priority_process(struct be_adapter *adapter,
-					       struct
-					       be_async_event_grp5_cos_priority
-					       *evt)
+					       struct be_mcc_compl *compl)
 {
+	struct be_async_event_grp5_cos_priority *evt =
+			(struct be_async_event_grp5_cos_priority *)compl;
+
 	if (evt->valid) {
 		adapter->vlan_prio_bmap = evt->available_priority_bmap;
 		adapter->recommended_prio &= ~VLAN_PRIO_MASK;
@@ -263,10 +267,11 @@ static void be_async_grp5_cos_priority_process(struct be_adapter *adapter,
 
 /* Grp5 QOS Speed evt: qos_link_speed is in units of 10 Mbps */
 static void be_async_grp5_qos_speed_process(struct be_adapter *adapter,
-					    struct
-					    be_async_event_grp5_qos_link_speed
-					    *evt)
+					    struct be_mcc_compl *compl)
 {
+	struct be_async_event_grp5_qos_link_speed *evt =
+			(struct be_async_event_grp5_qos_link_speed *)compl;
+
 	if (adapter->phy.link_speed >= 0 &&
 	    evt->physical_port == adapter->port_num)
 		adapter->phy.link_speed = le16_to_cpu(evt->qos_link_speed) * 10;
@@ -274,10 +279,11 @@ static void be_async_grp5_qos_speed_process(struct be_adapter *adapter,
 
 /*Grp5 PVID evt*/
 static void be_async_grp5_pvid_state_process(struct be_adapter *adapter,
-					     struct
-					     be_async_event_grp5_pvid_state
-					     *evt)
+					     struct be_mcc_compl *compl)
 {
+	struct be_async_event_grp5_pvid_state *evt =
+			(struct be_async_event_grp5_pvid_state *)compl;
+
 	if (evt->enabled) {
 		adapter->pvid = le16_to_cpu(evt->tag) & VLAN_VID_MASK;
 		dev_info(&adapter->pdev->dev, "LPVID: %d\n", adapter->pvid);
@@ -287,26 +293,21 @@ static void be_async_grp5_pvid_state_process(struct be_adapter *adapter,
 }
 
 static void be_async_grp5_evt_process(struct be_adapter *adapter,
-				      u32 trailer, struct be_mcc_compl *evt)
+				      struct be_mcc_compl *compl)
 {
-	u8 event_type = 0;
-
-	event_type = (trailer >> ASYNC_TRAILER_EVENT_TYPE_SHIFT) &
-		ASYNC_TRAILER_EVENT_TYPE_MASK;
+	u8 event_type = (compl->flags >> ASYNC_EVENT_TYPE_SHIFT) &
+				ASYNC_EVENT_TYPE_MASK;
 
 	switch (event_type) {
 	case ASYNC_EVENT_COS_PRIORITY:
-		be_async_grp5_cos_priority_process(adapter,
-		(struct be_async_event_grp5_cos_priority *)evt);
-	break;
+		be_async_grp5_cos_priority_process(adapter, compl);
+		break;
 	case ASYNC_EVENT_QOS_SPEED:
-		be_async_grp5_qos_speed_process(adapter,
-		(struct be_async_event_grp5_qos_link_speed *)evt);
-	break;
+		be_async_grp5_qos_speed_process(adapter, compl);
+		break;
 	case ASYNC_EVENT_PVID_STATE:
-		be_async_grp5_pvid_state_process(adapter,
-		(struct be_async_event_grp5_pvid_state *)evt);
-	break;
+		be_async_grp5_pvid_state_process(adapter, compl);
+		break;
 	default:
 		dev_warn(&adapter->pdev->dev, "Unknown grp5 event 0x%x!\n",
 			 event_type);
@@ -315,13 +316,13 @@ static void be_async_grp5_evt_process(struct be_adapter *adapter,
 }
 
 static void be_async_dbg_evt_process(struct be_adapter *adapter,
-				     u32 trailer, struct be_mcc_compl *cmp)
+				     struct be_mcc_compl *cmp)
 {
 	u8 event_type = 0;
 	struct be_async_event_qnq *evt = (struct be_async_event_qnq *) cmp;
 
-	event_type = (trailer >> ASYNC_TRAILER_EVENT_TYPE_SHIFT) &
-		ASYNC_TRAILER_EVENT_TYPE_MASK;
+	event_type = (cmp->flags >> ASYNC_EVENT_TYPE_SHIFT) &
+			ASYNC_EVENT_TYPE_MASK;
 
 	switch (event_type) {
 	case ASYNC_DEBUG_EVENT_TYPE_QNQ:
@@ -336,25 +337,33 @@ static void be_async_dbg_evt_process(struct be_adapter *adapter,
 	}
 }
 
-static inline bool is_link_state_evt(u32 trailer)
+static inline bool is_link_state_evt(u32 flags)
 {
-	return ((trailer >> ASYNC_TRAILER_EVENT_CODE_SHIFT) &
-		ASYNC_TRAILER_EVENT_CODE_MASK) ==
-				ASYNC_EVENT_CODE_LINK_STATE;
+	return ((flags >> ASYNC_EVENT_CODE_SHIFT) & ASYNC_EVENT_CODE_MASK) ==
+			ASYNC_EVENT_CODE_LINK_STATE;
 }
 
-static inline bool is_grp5_evt(u32 trailer)
+static inline bool is_grp5_evt(u32 flags)
 {
-	return (((trailer >> ASYNC_TRAILER_EVENT_CODE_SHIFT) &
-		ASYNC_TRAILER_EVENT_CODE_MASK) ==
-				ASYNC_EVENT_CODE_GRP_5);
+	return ((flags >> ASYNC_EVENT_CODE_SHIFT) & ASYNC_EVENT_CODE_MASK) ==
+			ASYNC_EVENT_CODE_GRP_5;
 }
 
-static inline bool is_dbg_evt(u32 trailer)
+static inline bool is_dbg_evt(u32 flags)
 {
-	return (((trailer >> ASYNC_TRAILER_EVENT_CODE_SHIFT) &
-		ASYNC_TRAILER_EVENT_CODE_MASK) ==
-				ASYNC_EVENT_CODE_QNQ);
+	return ((flags >> ASYNC_EVENT_CODE_SHIFT) & ASYNC_EVENT_CODE_MASK) ==
+			ASYNC_EVENT_CODE_QNQ;
+}
+
+static void be_mcc_event_process(struct be_adapter *adapter,
+				 struct be_mcc_compl *compl)
+{
+	if (is_link_state_evt(compl->flags))
+		be_async_link_state_process(adapter, compl);
+	else if (is_grp5_evt(compl->flags))
+		be_async_grp5_evt_process(adapter, compl);
+	else if (is_dbg_evt(compl->flags))
+		be_async_dbg_evt_process(adapter, compl);
 }
 
 static struct be_mcc_compl *be_mcc_compl_get(struct be_adapter *adapter)
@@ -396,21 +405,13 @@ int be_process_mcc(struct be_adapter *adapter)
 	struct be_mcc_obj *mcc_obj = &adapter->mcc_obj;
 
 	spin_lock(&adapter->mcc_cq_lock);
+
 	while ((compl = be_mcc_compl_get(adapter))) {
 		if (compl->flags & CQE_FLAGS_ASYNC_MASK) {
-			/* Interpret flags as an async trailer */
-			if (is_link_state_evt(compl->flags))
-				be_async_link_state_process(adapter,
-				(struct be_async_event_link_state *) compl);
-			else if (is_grp5_evt(compl->flags))
-				be_async_grp5_evt_process(adapter,
-							  compl->flags, compl);
-			else if (is_dbg_evt(compl->flags))
-				be_async_dbg_evt_process(adapter,
-							 compl->flags, compl);
+			be_mcc_event_process(adapter, compl);
 		} else if (compl->flags & CQE_FLAGS_COMPLETED_MASK) {
-				status = be_mcc_compl_process(adapter, compl);
-				atomic_dec(&mcc_obj->q.used);
+			status = be_mcc_compl_process(adapter, compl);
+			atomic_dec(&mcc_obj->q.used);
 		}
 		be_mcc_compl_use(compl);
 		num++;
diff --git a/drivers/net/ethernet/emulex/benet/be_cmds.h b/drivers/net/ethernet/emulex/benet/be_cmds.h
index af62403..d4616ff 100644
--- a/drivers/net/ethernet/emulex/benet/be_cmds.h
+++ b/drivers/net/ethernet/emulex/benet/be_cmds.h
@@ -87,13 +87,13 @@ struct be_mcc_compl {
 	u32 flags;		/* dword 3 */
 };
 
-/* When the async bit of mcc_compl is set, the last 4 bytes of
- * mcc_compl is interpreted as follows:
+/* When the async bit of mcc_compl flags is set, flags
+ * is interpreted as follows:
  */
-#define ASYNC_TRAILER_EVENT_CODE_SHIFT	8	/* bits 8 - 15 */
-#define ASYNC_TRAILER_EVENT_CODE_MASK	0xFF
-#define ASYNC_TRAILER_EVENT_TYPE_SHIFT	16
-#define ASYNC_TRAILER_EVENT_TYPE_MASK	0xFF
+#define ASYNC_EVENT_CODE_SHIFT		8	/* bits 8 - 15 */
+#define ASYNC_EVENT_CODE_MASK		0xFF
+#define ASYNC_EVENT_TYPE_SHIFT		16
+#define ASYNC_EVENT_TYPE_MASK		0xFF
 #define ASYNC_EVENT_CODE_LINK_STATE	0x1
 #define ASYNC_EVENT_CODE_GRP_5		0x5
 #define ASYNC_EVENT_QOS_SPEED		0x1
@@ -102,10 +102,6 @@ struct be_mcc_compl {
 #define ASYNC_EVENT_CODE_QNQ		0x6
 #define ASYNC_DEBUG_EVENT_TYPE_QNQ	1
 
-struct be_async_event_trailer {
-	u32 code;
-};
-
 enum {
 	LINK_DOWN	= 0x0,
 	LINK_UP		= 0x1
@@ -113,7 +109,7 @@ enum {
 #define LINK_STATUS_MASK			0x1
 #define LOGICAL_LINK_STATUS_MASK		0x2
 
-/* When the event code of an async trailer is link-state, the mcc_compl
+/* When the event code of compl->flags is link-state, the mcc_compl
  * must be interpreted as follows
  */
 struct be_async_event_link_state {
@@ -123,10 +119,10 @@ struct be_async_event_link_state {
 	u8 port_speed;
 	u8 port_fault;
 	u8 rsvd0[7];
-	struct be_async_event_trailer trailer;
+	u32 flags;
 } __packed;
 
-/* When the event code of an async trailer is GRP-5 and event_type is QOS_SPEED
+/* When the event code of compl->flags is GRP-5 and event_type is QOS_SPEED
  * the mcc_compl must be interpreted as follows
  */
 struct be_async_event_grp5_qos_link_speed {
@@ -134,10 +130,10 @@ struct be_async_event_grp5_qos_link_speed {
 	u8 rsvd[5];
 	u16 qos_link_speed;
 	u32 event_tag;
-	struct be_async_event_trailer trailer;
+	u32 flags;
 } __packed;
 
-/* When the event code of an async trailer is GRP5 and event type is
+/* When the event code of compl->flags is GRP5 and event type is
  * CoS-Priority, the mcc_compl must be interpreted as follows
  */
 struct be_async_event_grp5_cos_priority {
@@ -147,10 +143,10 @@ struct be_async_event_grp5_cos_priority {
 	u8 valid;
 	u8 rsvd0;
 	u8 event_tag;
-	struct be_async_event_trailer trailer;
+	u32 flags;
 } __packed;
 
-/* When the event code of an async trailer is GRP5 and event type is
+/* When the event code of compl->flags is GRP5 and event type is
  * PVID state, the mcc_compl must be interpreted as follows
  */
 struct be_async_event_grp5_pvid_state {
@@ -159,7 +155,7 @@ struct be_async_event_grp5_pvid_state {
 	u16 tag;
 	u32 event_tag;
 	u32 rsvd1;
-	struct be_async_event_trailer trailer;
+	u32 flags;
 } __packed;
 
 /* async event indicating outer VLAN tag in QnQ */
@@ -169,7 +165,7 @@ struct be_async_event_qnq {
 	u16 vlan_tag;
 	u32 event_tag;
 	u8 rsvd1[4];
-	struct be_async_event_trailer trailer;
+	u32 flags;
 } __packed;
 
 struct be_mcc_mailbox {
-- 
1.7.1

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