[PATCH v6 3/8] scsi: ibmvfc: define asynchronous sub-queue

From: Dave Marquardt <redacted>

Define data structures for asynchronous sub-queue support required for
full and extended FPIN functionality.

Add ibmvfc_async_subq structure to represent async events received via
the sub-queue, including FPIN status, link state, event type, and WWPN
information.

Update ibmvfc_channel_setup structure to include async_subq_handle field
and reduce IBMVFC_MAX_CHANNELS from 502 to 501 to accommodate the async
sub-queue. Add async_scrq pointer to ibmvfc_channels structure.

Add capability flags IBMVFC_USE_ASYNC_SUBQ and IBMVFC_SUPPORT_ASYNC_SUBQ
for negotiating async sub-queue support with VIOS during login.

Signed-off-by: Dave Marquardt <redacted>
---
 drivers/scsi/ibmvscsi/ibmvfc.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h
index e8ca0d30f483..d8880d02685b 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.h
+++ b/drivers/scsi/ibmvscsi/ibmvfc.h

@@ -773,6 +773,7 @@ struct ibmvfc_async_sub_crq {
 	volatile u8 valid;
 	u8 flags;
 #define IBMVFC_ASYNC_ID_IS_ASSOC_ID	0x01
+#define IBMVFC_ASYNC_IS_FPIN_EXT	0x02
 	u8 link_state;
 	u8 fpin_status;
 	__be16 event;

@@ -790,7 +791,6 @@ struct ibmvfc_async_work {
 	struct ibmvfc_async_crq crq;
 	struct work_struct async_work_s;
 };
-
 union ibmvfc_iu {
 	struct ibmvfc_mad_common mad_common;
 	struct ibmvfc_npiv_login_mad npiv_login;

@@ -990,6 +990,7 @@ struct ibmvfc_host {
 	mempool_t *tgt_pool;
 	struct ibmvfc_queue crq;
 	struct ibmvfc_queue async_crq;
+	struct ibmvfc_queue async_sub_crq;
 	struct ibmvfc_channels scsi_scrqs;
 	struct ibmvfc_channels nvme_scrqs;
 	struct ibmvfc_npiv_login login_info;

-- 
2.55.0