[PATCH v4 4/8] ibmvfc: define asynchronous sub-queue

[Dave Marquardt via B4 Relay]

From: Dave Marquardt <davemarq@xxxxxxxxxxxxx>

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 <davemarq@xxxxxxxxxxxxx>
---
 drivers/scsi/ibmvscsi/ibmvfc.h | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h
index adfd67e85af8..f38dfae9924c 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.h
+++ b/drivers/scsi/ibmvscsi/ibmvfc.h
@@ -182,6 +182,7 @@ struct ibmvfc_npiv_login {
 #define IBMVFC_CAN_USE_MAD_VERSION	0x008
 #define IBMVFC_CAN_SEND_VF_WWPN		0x010
 #define IBMVFC_YES_SCSI			0x040
+#define IBMVFC_USE_ASYNC_SUBQ		0x100
 #define IBMVFC_CAN_USE_NOOP_CMD		0x200
 	__be64 node_name;
 	struct srp_direct_buf async;
@@ -230,6 +231,7 @@ struct ibmvfc_npiv_login_resp {
 #define IBMVFC_HANDLE_VF_WWPN		0x0040
 #define IBMVFC_CAN_SUPPORT_CHANNELS	0x0080
 #define IBMVFC_SUPPORT_SCSI		0x0200
+#define IBMVFC_SUPPORT_ASYNC_SUBQ	0x0800
 #define IBMVFC_SUPPORT_NOOP_CMD		0x1000
 	__be32 max_cmds;
 	__be32 scsi_id_sz;
@@ -564,7 +566,7 @@ struct ibmvfc_channel_setup_mad {
 	struct srp_direct_buf buffer;
 } __packed __aligned(8);
 
-#define IBMVFC_MAX_CHANNELS	502
+#define IBMVFC_MAX_CHANNELS	501
 
 struct ibmvfc_channel_setup {
 	__be32 flags;
@@ -579,6 +581,7 @@ struct ibmvfc_channel_setup {
 	struct srp_direct_buf buffer;
 	__be64 reserved2[5];
 	__be64 channel_handles[IBMVFC_MAX_CHANNELS];
+	__be64 async_subq_handle;
 } __packed __aligned(8);
 
 struct ibmvfc_connection_info {
@@ -715,6 +718,25 @@ 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;
@@ -854,6 +876,7 @@ 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