Merge patch series "ibmvfc: fixes and generic prep work for NVMeoF support"

Tyrel Datwyler <tyreld@linux.ibm.com> says:

This series includes a couple minor fixes, generalization of some code
that is not protocol specific, and a reworking of the way event pool
buffers are accounted for by the driver. This is a precursor to a
series to follow that introduces support for NVMeoF protocol with
ibmvfc.

Link: https://lore.kernel.org/r/20230921225435.3537728-1-tyreld@linux.ibm.comSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ibmvscsi/ibmvfc.h

@@ -27,6 +27,7 @@
 #define IBMVFC_ABORT_TIMEOUT		8
 #define IBMVFC_ABORT_WAIT_TIMEOUT	40
 #define IBMVFC_MAX_REQUESTS_DEFAULT	100
+#define IBMVFC_SCSI_QDEPTH		128
 
 #define IBMVFC_DEBUG			0
 #define IBMVFC_MAX_TARGETS		1024
@@ -57,6 +58,8 @@
  * 2 for each discovery thread
  */
 #define IBMVFC_NUM_INTERNAL_REQ	(1 + 1 + 1 + 2 + (disc_threads * 2))
+/* Reserved suset of events for cancelling channelized IO commands */
+#define IBMVFC_NUM_INTERNAL_SUBQ_REQ 4
 
 #define IBMVFC_MAD_SUCCESS		0x00
 #define IBMVFC_MAD_NOT_SUPPORTED	0xF1
@@ -713,9 +716,15 @@ enum ibmvfc_target_action {
 	IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT,
 };
 
+enum ibmvfc_protocol {
+	IBMVFC_PROTO_SCSI = 0,
+	IBMVFC_PROTO_NVME = 1,
+};
+
 struct ibmvfc_target {
 	struct list_head queue;
 	struct ibmvfc_host *vhost;
+	enum ibmvfc_protocol protocol;
 	u64 scsi_id;
 	u64 wwpn;
 	u64 new_scsi_id;
@@ -758,6 +767,7 @@ struct ibmvfc_event {
 	struct completion *eh_comp;
 	struct timer_list timer;
 	u16 hwq;
+	u8 reserved;
 };
 
 /* a pool of event structs for use */
@@ -793,6 +803,11 @@ struct ibmvfc_queue {
 	struct ibmvfc_event_pool evt_pool;
 	struct list_head sent;
 	struct list_head free;
+	u16 total_depth;
+	u16 evt_depth;
+	u16 reserved_depth;
+	u16 evt_free;
+	u16 reserved_free;
 	spinlock_t l_lock;
 
 	union ibmvfc_iu cancel_rsp;
@@ -804,11 +819,18 @@ struct ibmvfc_queue {
 	unsigned long irq;
 	unsigned long hwq_id;
 	char name[32];
+	irq_handler_t handler;
 };
 
-struct ibmvfc_scsi_channels {
+struct ibmvfc_channels {
 	struct ibmvfc_queue *scrqs;
+	enum ibmvfc_protocol protocol;
 	unsigned int active_queues;
+	unsigned int desired_queues;
+	unsigned int max_queues;
+	int disc_buf_sz;
+	struct ibmvfc_discover_targets_entry *disc_buf;
+	dma_addr_t disc_buf_dma;
 };
 
 enum ibmvfc_host_action {
@@ -857,37 +879,33 @@ struct ibmvfc_host {
 	mempool_t *tgt_pool;
 	struct ibmvfc_queue crq;
 	struct ibmvfc_queue async_crq;
-	struct ibmvfc_scsi_channels scsi_scrqs;
+	struct ibmvfc_channels scsi_scrqs;
 	struct ibmvfc_npiv_login login_info;
 	union ibmvfc_npiv_login_data *login_buf;
 	dma_addr_t login_buf_dma;
 	struct ibmvfc_channel_setup *channel_setup_buf;
 	dma_addr_t channel_setup_dma;
-	int disc_buf_sz;
 	int log_level;
-	struct ibmvfc_discover_targets_entry *disc_buf;
 	struct mutex passthru_mutex;
-	int max_vios_scsi_channels;
+	unsigned int max_vios_scsi_channels;
 	int task_set;
 	int init_retries;
 	int discovery_threads;
 	int abort_threads;
-	int client_migrated;
-	int reinit;
-	int delay_init;
-	int scan_complete;
+	int client_migrated:1;
+	int reinit:1;
+	int delay_init:1;
+	int logged_in:1;
+	int mq_enabled:1;
+	int using_channels:1;
+	int do_enquiry:1;
+	int aborting_passthru:1;
+	int scan_complete:1;
 	int scan_timeout;
-	int logged_in;
-	int mq_enabled;
-	int using_channels;
-	int do_enquiry;
-	int client_scsi_channels;
-	int aborting_passthru;
 	int events_to_log;
 #define IBMVFC_AE_LINKUP	0x0001
 #define IBMVFC_AE_LINKDOWN	0x0002
 #define IBMVFC_AE_RSCN		0x0004
-	dma_addr_t disc_buf_dma;
 	unsigned int partition_number;
 	char partition_name[97];
 	void (*job_step) (struct ibmvfc_host *);