[PATCH v5 3/7] scsi: ibmvfc: define asynchronous sub-queue

From: Dave Marquardt <[email protected]>

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 <[email protected]>
---
 drivers/scsi/ibmvscsi/ibmvfc.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h
index e8ca0d30f483..3711be4b6748 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.h
+++ b/drivers/scsi/ibmvscsi/ibmvfc.h
@@ -791,6 +791,25 @@ struct ibmvfc_async_work {
 	struct work_struct async_work_s;
 };
 
+struct ibmvfc_async_subq {
+	volatile u8 valid;
+#define IBMVFC_ASYNC_ID_IS_ASSOC_ID	0x01
+#define IBMVFC_FC_EEH			0x04
+#define IBMVFC_FC_FW_UPDATE		0x08
+#define IBMVFC_FC_FW_DUMP		0x10
+	u8 flags;
+	u8 link_state;
+	u8 fpin_status;
+	__be16 event;
+	__be16 pad;
+	volatile __be64 wwpn;
+	volatile __be64 nport_id;
+	union {
+		__be64 node_name;
+		__be64 assoc_id;
+	} id;
+} __packed __aligned(8);
+
 union ibmvfc_iu {
 	struct ibmvfc_mad_common mad_common;
 	struct ibmvfc_npiv_login_mad npiv_login;
@@ -935,6 +954,7 @@ struct ibmvfc_queue {
 
 struct ibmvfc_channels {
 	struct ibmvfc_queue *scrqs;
+	struct ibmvfc_queue *async_scrq;
 	enum ibmvfc_protocol protocol;
 	unsigned int active_queues;
 	unsigned int desired_queues;

-- 
2.55.0