lpfc: nvmet: Add support for NVME LS request hosthandle

As the nvmet layer does not have the concept of a remoteport object, which
can be used to identify the entity on the other end of the fabric that is
to receive an LS, the hosthandle was introduced.  The driver passes the
hosthandle, a value representative of the remote port, with a ls request
receive. The LS request will create the association.  The transport will
remember the hosthandle for the association, and if there is a need to
initiate a LS request to the remote port for the association, the
hosthandle will be used. When the driver loses connectivity with the
remote port, it needs to notify the transport that the hosthandle is no
longer valid, allowing the transport to terminate associations related to
the hosthandle.

This patch adds support to the driver for the hosthandle. The driver will
use the ndlp pointer of the remote port for the hosthandle in calls to
nvmet_fc_rcv_ls_req().  The discovery engine is updated to invalidate the
hosthandle whenever connectivity with the remote port is lost.

Signed-off-by: Paul Ely <paul.ely@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 52 insertions, 1 deletions

diff --git a/drivers/scsi/lpfc/lpfc_nvmet.c b/drivers/scsi/lpfc/lpfc_nvmet.c
index 6a1365df6c65..5584eaafbfb2 100644
--- a/drivers/scsi/lpfc/lpfc_nvmet.c
+++ b/drivers/scsi/lpfc/lpfc_nvmet.c
@@ -1283,6 +1283,24 @@ lpfc_nvmet_defer_rcv(struct nvmet_fc_target_port *tgtport,
 }
 
 static void
+lpfc_nvmet_host_release(void *hosthandle)
+{
+	struct lpfc_nodelist *ndlp = hosthandle;
+	struct lpfc_hba *phba = NULL;
+	struct lpfc_nvmet_tgtport *tgtp;
+
+	phba = ndlp->phba;
+	if (!phba->targetport || !phba->targetport->private)
+		return;
+
+	lpfc_printf_log(phba, KERN_ERR, LOG_NVME,
+			"6202 NVMET XPT releasing hosthandle x%px\n",
+			hosthandle);
+	tgtp = (struct lpfc_nvmet_tgtport *)phba->targetport->private;
+	atomic_set(&tgtp->state, 0);
+}
+
+static void
 lpfc_nvmet_discovery_event(struct nvmet_fc_target_port *tgtport)
 {
 	struct lpfc_nvmet_tgtport *tgtp;
@@ -1306,6 +1324,7 @@ static struct nvmet_fc_target_template lpfc_tgttemplate = {
 	.fcp_req_release = lpfc_nvmet_xmt_fcp_release,
 	.defer_rcv	= lpfc_nvmet_defer_rcv,
 	.discovery_event = lpfc_nvmet_discovery_event,
+	.host_release   = lpfc_nvmet_host_release,
 
 	.max_hw_queues  = 1,
 	.max_sgl_segments = LPFC_NVMET_DEFAULT_SEGS,
@@ -2044,7 +2063,12 @@ lpfc_nvmet_handle_lsreq(struct lpfc_hba *phba,
 
 	atomic_inc(&tgtp->rcv_ls_req_in);
 
-	rc = nvmet_fc_rcv_ls_req(phba->targetport, NULL, &axchg->ls_rsp,
+	/*
+	 * Driver passes the ndlp as the hosthandle argument allowing
+	 * the transport to generate LS requests for any associateions
+	 * that are created.
+	 */
+	rc = nvmet_fc_rcv_ls_req(phba->targetport, axchg->ndlp, &axchg->ls_rsp,
 				 axchg->payload, axchg->size);
 
 	lpfc_printf_log(phba, KERN_INFO, LOG_NVME_DISC,
@@ -3476,3 +3500,30 @@ out:
 			"6056 Failed to Issue ABTS. Status x%x\n", rc);
 	return 0;
 }
+
+/**
+ * lpfc_nvmet_invalidate_host
+ *
+ * @phba - pointer to the driver instance bound to an adapter port.
+ * @ndlp - pointer to an lpfc_nodelist type
+ *
+ * This routine upcalls the nvmet transport to invalidate an NVME
+ * host to which this target instance had active connections.
+ */
+void
+lpfc_nvmet_invalidate_host(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp)
+{
+	struct lpfc_nvmet_tgtport *tgtp;
+
+	lpfc_printf_log(phba, KERN_INFO, LOG_NVME | LOG_NVME_ABTS,
+			"6203 Invalidating hosthandle x%px\n",
+			ndlp);
+
+	tgtp = (struct lpfc_nvmet_tgtport *)phba->targetport->private;
+	atomic_set(&tgtp->state, LPFC_NVMET_INV_HOST_ACTIVE);
+
+#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))
+	/* Need to get the nvmet_fc_target_port pointer here.*/
+	nvmet_fc_invalidate_host(phba->targetport, ndlp);
+#endif
+}