[PATCH v2 15/33] ibmvfc: send NVMe target discovery MAD

[Tyrel Datwyler <tyreld@linux.ibm.com>]

Extend target discovery to send protocol-specific discover-target MADs
for NVMe/FC.

Use the protocol-aware discovery helper to build an NVMe discover-target
request, submit it when NVMe/FC support is active, and process the
returned target count using the NVMe channel group's discovery buffer.

This allows the driver to discover NVMe/FC targets in parallel with the
existing SCSI discovery flow while keeping protocol-specific target data
separate.

Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
---
 drivers/scsi/ibmvscsi/ibmvfc-core.c | 50 +++++++++++++++++++++++++----
 1 file changed, 43 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc-core.c b/drivers/scsi/ibmvscsi/ibmvfc-core.c
index a700e2554e69..1d2a88e9fe94 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc-core.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc-core.c
@@ -173,6 +173,11 @@ static const struct {
 	{ IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." },
 };
 
+static const char *proto_type[] = {
+	"SCSI",
+	"NVMe",
+};
+
 static void ibmvfc_npiv_login(struct ibmvfc_host *);
 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
@@ -5011,19 +5016,30 @@ static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
 {
 	struct ibmvfc_host *vhost = evt->vhost;
 	struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
+	struct ibmvfc_channels *channels;
 	u32 mad_status = be16_to_cpu(rsp->common.status);
+	u32 opcode = be32_to_cpu(rsp->common.opcode);
 	int level = IBMVFC_DEFAULT_LOG_LEVEL;
 
+	if (opcode == IBMVFC_DISC_TARGETS)
+		channels = &vhost->scsi_scrqs;
+	else
+		channels = &vhost->nvme_scrqs;
+
 	switch (mad_status) {
 	case IBMVFC_MAD_SUCCESS:
-		ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
-		vhost->scsi_scrqs.num_targets = min_t(u32, be32_to_cpu(rsp->num_written),
-						      max_targets);
+		ibmvfc_dbg(vhost, "Discover %s Targets succeeded\n",
+			   proto_type[channels->protocol]);
+		channels->num_targets = min_t(u32, be32_to_cpu(rsp->num_written),
+					      max_targets);
+		ibmvfc_dbg(vhost, "%d %s targets found\n", channels->num_targets,
+			   proto_type[channels->protocol]);
 		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
 		break;
 	case IBMVFC_MAD_FAILED:
 		level += ibmvfc_retry_host_init(vhost);
-		ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
+		ibmvfc_log(vhost, level, "Discover %s Targets failed: %s (%x:%x)\n",
+			   proto_type[channels->protocol],
 			   ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
 			   be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
 		break;
@@ -5076,7 +5092,7 @@ static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
 	int level = IBMVFC_DEFAULT_LOG_LEVEL;
 
 	if (!evt) {
-		ibmvfc_log(vhost, level, "Discover Targets failed: no available events\n");
+		ibmvfc_log(vhost, level, "Discover SCSI Targets failed: no available events\n");
 		ibmvfc_hard_reset_host(vhost);
 		return;
 	}
@@ -5084,9 +5100,29 @@ static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
 	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
 
 	if (!ibmvfc_send_event(evt, vhost, default_timeout))
-		ibmvfc_dbg(vhost, "Sent discover targets\n");
+		ibmvfc_dbg(vhost, "Sent discover SCSI targets\n");
 	else
-		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+		goto link_down;
+
+	if (!ibmvfc_nvme_active(vhost))
+		return;
+
+	evt = ibmvfc_get_disc_event(&vhost->nvme_scrqs);
+	if (!evt) {
+		ibmvfc_log(vhost, level, "Discover NVMe Targets failed: no available events\n");
+		ibmvfc_hard_reset_host(vhost);
+		return;
+	}
+
+	if (!ibmvfc_send_event(evt, vhost, default_timeout))
+		ibmvfc_dbg(vhost, "Sent discover NVMe targets\n");
+	else
+		goto link_down;
+
+	return;
+
+link_down:
+	ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
 }
 
 static void ibmvfc_fabric_login_nvme_done(struct ibmvfc_event *evt)
-- 
2.55.0