scsi: fnic: Refactor and redefine fnic.h for multiqueue

Refactor and re-define values in fnic.h to implement multiqueue (MQ)
functionality.

VIC firmware allows fnic to create up to 64 copy workqueues. Update the
copy workqueue max to 64.  Modify the interrupt index to be in sync with
the firmware to support MQ.  Add irq number to the MSIX entry.  Define a
software workqueue table to track the status of io_reqs. Define a base for
the copy workqueue.

Reviewed-by: Sesidhar Baddela <[email protected]>
Reviewed-by: Arulprabhu Ponnusamy <[email protected]>
Signed-off-by: Karan Tilak Kumar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin K. Petersen <[email protected]>

Author: Karan Tilak Kumar

drivers/scsi/fnic/fnic.h

@@ -167,20 +167,29 @@ do {								\
 #define FNIC_MAIN_NOTE(kern_level, host, fmt, args...)          \
 	shost_printk(kern_level, host, fmt, ##args)
 
+#define FNIC_WQ_COPY_MAX 64
+#define FNIC_WQ_MAX 1
+#define FNIC_RQ_MAX 1
+#define FNIC_CQ_MAX (FNIC_WQ_COPY_MAX + FNIC_WQ_MAX + FNIC_RQ_MAX)
+#define FNIC_DFLT_IO_COMPLETIONS 256
+
+#define FNIC_MQ_CQ_INDEX        2
+
 extern const char *fnic_state_str[];
 
 enum fnic_intx_intr_index {
 	FNIC_INTX_WQ_RQ_COPYWQ,
-	FNIC_INTX_ERR,
+	FNIC_INTX_DUMMY,
 	FNIC_INTX_NOTIFY,
+	FNIC_INTX_ERR,
 	FNIC_INTX_INTR_MAX,
 };
 
 enum fnic_msix_intr_index {
 	FNIC_MSIX_RQ,
 	FNIC_MSIX_WQ,
 	FNIC_MSIX_WQ_COPY,
-	FNIC_MSIX_ERR_NOTIFY,
+	FNIC_MSIX_ERR_NOTIFY = FNIC_MSIX_WQ_COPY + FNIC_WQ_COPY_MAX,
 	FNIC_MSIX_INTR_MAX,
 };
 
@@ -189,6 +198,7 @@ struct fnic_msix_entry {
 	char devname[IFNAMSIZ + 11];
 	irqreturn_t (*isr)(int, void *);
 	void *devid;
+	int irq_num;
 };
 
 enum fnic_state {
@@ -198,12 +208,6 @@ enum fnic_state {
 	FNIC_IN_ETH_TRANS_FC_MODE,
 };
 
-#define FNIC_WQ_COPY_MAX 1
-#define FNIC_WQ_MAX 1
-#define FNIC_RQ_MAX 1
-#define FNIC_CQ_MAX (FNIC_WQ_COPY_MAX + FNIC_WQ_MAX + FNIC_RQ_MAX)
-#define FNIC_DFLT_IO_COMPLETIONS 256
-
 struct mempool;
 
 enum fnic_evt {
@@ -218,6 +222,13 @@ struct fnic_event {
 	enum fnic_evt event;
 };
 
+struct fnic_cpy_wq {
+	unsigned long hw_lock_flags;
+	u16 active_ioreq_count;
+	u16 ioreq_table_size;
+	____cacheline_aligned struct fnic_io_req **io_req_table;
+};
+
 /* Per-instance private data structure */
 struct fnic {
 	int fnic_num;
@@ -289,6 +300,7 @@ struct fnic {
 	mempool_t *io_sgl_pool[FNIC_SGL_NUM_CACHES];
 	spinlock_t io_req_lock[FNIC_IO_LOCKS];	/* locks for scsi cmnds */
 
+	unsigned int copy_wq_base;
 	struct work_struct link_work;
 	struct work_struct frame_work;
 	struct sk_buff_head frame_queue;
@@ -308,6 +320,8 @@ struct fnic {
 
 	/* copy work queue cache line section */
 	____cacheline_aligned struct vnic_wq_copy hw_copy_wq[FNIC_WQ_COPY_MAX];
+	____cacheline_aligned struct fnic_cpy_wq sw_copy_wq[FNIC_WQ_COPY_MAX];
+
 	/* completion queue cache line section */
 	____cacheline_aligned struct vnic_cq cq[FNIC_CQ_MAX];