[PATCH 14/29] ibmvfc: add NVMe/FC Process Login support

[Tyrel Datwyler]

Extend PRLI handling code to support NVMe/FC targets.

When the target protocol is NVMe/FC, issue the NVMe process login MAD,
set the NVMe FC-4 type, and populate NVMe-specific service parameters.
On completion, decode the returned PRLI service parameters and derive
the appropriate remote-port roles for NVMe initiator, target, and
discovery ports.

Keep the existing SCSI PRLI flow unchanged while allowing the common
target state machine to complete login for NVMe/FC targets.

Signed-off-by: Tyrel Datwyler <tyreld@xxxxxxxxxxxxx>
---
 drivers/scsi/ibmvscsi/ibmvfc-core.c | 55 ++++++++++++++++++++---------
 drivers/scsi/ibmvscsi/ibmvfc.h      |  6 ++++
 2 files changed, 45 insertions(+), 16 deletions(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc-core.c b/drivers/scsi/ibmvscsi/ibmvfc-core.c
index 2c54d0b9add4..b45cd0183fb5 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc-core.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc-core.c
@@ -4088,11 +4088,12 @@ static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
 	switch (status) {
 	case IBMVFC_MAD_SUCCESS:
-		tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
-			parms->type, parms->flags, parms->service_parms);
+		tgt_dbg(tgt, "%s Process Login succeeded: %X %02X %04X\n",
+			proto_type[tgt->protocol], parms->type, parms->flags,
+			parms->service_parms);
 
+		index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
 		if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
-			index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
 			if (prli_rsp[index].logged_in) {
 				if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
 					tgt->need_login = 0;
@@ -4108,6 +4109,22 @@ static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
 				ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
 			else
 				ibmvfc_del_tgt(tgt);
+		} else if (parms->type == IBMVFC_NVME_FCP_TYPE) {
+			if (prli_rsp[index].logged_in) {
+				/* For FC-NVMe PRLI the Image Pair field is always set to zero (see 6.3.3) */
+				tgt->need_login = 0;
+				tgt->ids.roles = 0;
+				if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_NVME_TARGET)
+					tgt->ids.roles |= FC_PORT_ROLE_NVME_TARGET;
+				if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_NVME_INITIATOR)
+					tgt->ids.roles |= FC_PORT_ROLE_NVME_INITIATOR;
+				if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_NVME_DISCOVERY)
+					tgt->ids.roles |= FC_PORT_ROLE_NVME_DISCOVERY;
+				tgt->add_rport = 1;
+			} else if (prli_rsp[index].retry)
+				ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
+			else
+				ibmvfc_del_tgt(tgt);
 		} else
 			ibmvfc_del_tgt(tgt);
 		break;
@@ -4128,9 +4145,10 @@ static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
 		else
 			ibmvfc_del_tgt(tgt);
 
-		tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\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), status);
+		tgt_log(tgt, level, "%s Process Login failed: %s (%x:%x) rc=0x%02X\n",
+			proto_type[tgt->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), status);
 		break;
 	}
 
@@ -4172,25 +4190,30 @@ static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
 	} else {
 		prli->common.version = cpu_to_be32(1);
 	}
-	prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
+	if (tgt->protocol == IBMVFC_PROTO_SCSI) {
+		prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
+		prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
+		prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
+		prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
+		prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
+
+		if (cls3_error)
+			prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
+	} else {
+		prli->common.opcode = cpu_to_be32(IBMVFC_NVMF_PROCESS_LOGIN);
+		prli->parms.type = IBMVFC_NVME_FCP_TYPE;
+		prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_NVME_INITIATOR);
+	}
 	prli->common.length = cpu_to_be16(sizeof(*prli));
 	prli->scsi_id = cpu_to_be64(tgt->scsi_id);
 
-	prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
-	prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
-	prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
-	prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
-
-	if (cls3_error)
-		prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
-
 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
 	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
 		vhost->discovery_threads--;
 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
 		kref_put(&tgt->kref, ibmvfc_release_tgt);
 	} else
-		tgt_dbg(tgt, "Sent process login\n");
+		tgt_dbg(tgt, "%s Sent process login\n", proto_type[tgt->protocol]);
 }
 
 /**
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h
index 67f546ff092e..66025e6ffeed 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.h
+++ b/drivers/scsi/ibmvscsi/ibmvfc.h
@@ -381,6 +381,7 @@ struct ibmvfc_move_login {
 struct ibmvfc_prli_svc_parms {
 	u8 type;
 #define IBMVFC_SCSI_FCP_TYPE		0x08
+#define IBMVFC_NVME_FCP_TYPE		0x28
 	u8 type_ext;
 	__be16 flags;
 #define IBMVFC_PRLI_ORIG_PA_VALID			0x8000
@@ -396,6 +397,11 @@ struct ibmvfc_prli_svc_parms {
 #define IBMVFC_PRLI_TARGET_FUNC			0x00000010
 #define IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED	0x00000002
 #define IBMVFC_PRLI_WR_FCP_XFER_RDY_DISABLED	0x00000001
+#define IBMVFC_PRLI_NVME_PI_CTRL		0x00000200
+#define IBMVFC_PRLI_NVME_SLER			0x00000100
+#define IBMVFC_PRLI_NVME_INITIATOR		0x00000020
+#define IBMVFC_PRLI_NVME_TARGET			0x00000010
+#define IBMVFC_PRLI_NVME_DISCOVERY		0x00000008
 } __packed __aligned(4);
 
 struct ibmvfc_process_login {
-- 
2.54.0