From: Dave Marquardt <redacted>

Add support for fabric login in order to support the asynchronous
event queue with its own interrupt as required by NPIV specification
to support the asynchronous sub-queue and interrupt in order to
support full and extended FPIN messages.
---
 drivers/scsi/ibmvscsi/ibmvfc.c | 94 ++++++++++++++++++++++++++++++++++++++++--
 drivers/scsi/ibmvscsi/ibmvfc.h | 16 +++++++
 2 files changed, 106 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 88386d7c9106..a18861808325 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c

@@ -5244,6 +5244,86 @@ static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
 		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
 }
 
+static void ibmvfc_fabric_login_done(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_fabric_login *rsp = &evt->xfer_iu->fabric_login;
+	u32 mad_status = be16_to_cpu(rsp->common.status);
+	struct ibmvfc_host *vhost = evt->vhost;
+	int level = IBMVFC_DEFAULT_LOG_LEVEL;
+
+	ENTER;
+
+	switch (mad_status) {
+	case IBMVFC_MAD_SUCCESS:
+		fc_host_port_id(vhost->host) = be64_to_cpu(rsp->nport_id);
+		ibmvfc_free_event(evt);
+		break;
+
+	case IBMVFC_MAD_FAILED:
+		if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
+			level += ibmvfc_retry_host_init(vhost);
+		else
+			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+		ibmvfc_log(vhost, level, "Fabric Login failed: %s (%x:%x)\n",
+			   ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
+						be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
+		ibmvfc_free_event(evt);
+		LEAVE;
+		return;
+
+	case IBMVFC_MAD_CRQ_ERROR:
+		ibmvfc_retry_host_init(vhost);
+		fallthrough;
+
+	case IBMVFC_MAD_DRIVER_FAILED:
+		ibmvfc_free_event(evt);
+		LEAVE;
+		return;
+
+	default:
+		dev_err(vhost->dev, "Invalid fabric Login response: 0x%x\n", mad_status);
+		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+		ibmvfc_free_event(evt);
+		LEAVE;
+		return;
+	}
+
+	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
+	wake_up(&vhost->work_wait_q);
+
+	LEAVE;
+}
+
+static void ibmvfc_fabric_login(struct ibmvfc_host *vhost)
+{
+	struct ibmvfc_fabric_login *mad;
+	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
+	int level = IBMVFC_DEFAULT_LOG_LEVEL;
+
+	if (!evt) {
+		ibmvfc_log(vhost, level, "Fabric Login failed: no available events\n");
+		ibmvfc_hard_reset_host(vhost);
+		return;
+	}
+
+	ibmvfc_init_event(evt, ibmvfc_fabric_login_done, IBMVFC_MAD_FORMAT);
+	mad = &evt->iu.fabric_login;
+	memset(mad, 0, sizeof(*mad));
+	if (vhost->scsi_scrqs.protocol == IBMVFC_PROTO_SCSI)
+		mad->common.opcode = cpu_to_be32(IBMVFC_FABRIC_LOGIN);
+	else {
+		ibmvfc_log(vhost, level, "Fabric Login failed: unknown protocol\n");
+		return;
+	}