[PATCH v2 26/26] lpfc: nvmet: Add Send LS Request and Abort LS Request support

[James Smart <jsmart2021@gmail.com>]

Now that common helpers exist, add the ability to Send an NVME LS Request
and to Abort an outstanding LS Request to the nvmet side of the driver.

Signed-off-by: Paul Ely <paul.ely@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>

---
v2:
  Removed the xmt_ls_xxx and cmpl_ls_xxx atomic stats that aren't
  meaningful to be tracked.
---
 drivers/scsi/lpfc/lpfc_nvmet.c | 95 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)

diff --git a/drivers/scsi/lpfc/lpfc_nvmet.c b/drivers/scsi/lpfc/lpfc_nvmet.c
index df0378fd4b59..0d137ce7aa0b 100644
--- a/drivers/scsi/lpfc/lpfc_nvmet.c
+++ b/drivers/scsi/lpfc/lpfc_nvmet.c
@@ -1283,6 +1283,98 @@ lpfc_nvmet_defer_rcv(struct nvmet_fc_target_port *tgtport,
 	spin_unlock_irqrestore(&ctxp->ctxlock, iflag);
 }
 
+/**
+ * lpfc_nvmet_ls_req_cmp - completion handler for a nvme ls request
+ * @phba: Pointer to HBA context object
+ * @cmdwqe: Pointer to driver command WQE object.
+ * @wcqe: Pointer to driver response CQE object.
+ *
+ * This function is the completion handler for NVME LS requests.
+ * The function updates any states and statistics, then calls the
+ * generic completion handler to finish completion of the request.
+ **/
+static void
+lpfc_nvmet_ls_req_cmp(struct lpfc_hba *phba, struct lpfc_iocbq *cmdwqe,
+		       struct lpfc_wcqe_complete *wcqe)
+{
+	__lpfc_nvme_ls_req_cmp(phba, cmdwqe->vport, cmdwqe, wcqe);
+}
+
+/**
+ * lpfc_nvmet_ls_req - Issue an Link Service request
+ * @targetport - pointer to target instance registered with nvmet transport.
+ * @hosthandle - hosthandle set by the driver in a prior ls_rqst_rcv.
+ *               Driver sets this value to the ndlp pointer.
+ * @pnvme_lsreq - the transport nvme_ls_req structure for the LS
+ *
+ * Driver registers this routine to handle any link service request
+ * from the nvme_fc transport to a remote nvme-aware port.
+ *
+ * Return value :
+ *   0 - Success
+ *   non-zero: various error codes, in form of -Exxx
+ **/
+static int
+lpfc_nvmet_ls_req(struct nvmet_fc_target_port *targetport,
+		  void *hosthandle,
+		  struct nvmefc_ls_req *pnvme_lsreq)
+{
+	struct lpfc_nvmet_tgtport *lpfc_nvmet = targetport->private;
+	struct lpfc_hba *phba;
+	struct lpfc_nodelist *ndlp;
+	int ret;
+	u32 hstate;
+
+	if (!lpfc_nvmet)
+		return -EINVAL;
+
+	phba = lpfc_nvmet->phba;
+	if (phba->pport->load_flag & FC_UNLOADING)
+		return -EINVAL;
+
+	hstate = atomic_read(&lpfc_nvmet->state);
+	if (hstate == LPFC_NVMET_INV_HOST_ACTIVE)
+		return -EACCES;
+
+	ndlp = (struct lpfc_nodelist *)hosthandle;
+
+	ret = __lpfc_nvme_ls_req(phba->pport, ndlp, pnvme_lsreq,
+				 lpfc_nvmet_ls_req_cmp);
+
+	return ret;
+}
+
+/**
+ * lpfc_nvmet_ls_abort - Abort a prior NVME LS request
+ * @targetport: Transport targetport, that LS was issued from.
+ * @hosthandle - hosthandle set by the driver in a prior ls_rqst_rcv.
+ *               Driver sets this value to the ndlp pointer.
+ * @pnvme_lsreq - the transport nvme_ls_req structure for LS to be aborted
+ *
+ * Driver registers this routine to abort an NVME LS request that is
+ * in progress (from the transports perspective).
+ **/
+static void
+lpfc_nvmet_ls_abort(struct nvmet_fc_target_port *targetport,
+		    void *hosthandle,
+		    struct nvmefc_ls_req *pnvme_lsreq)
+{
+	struct lpfc_nvmet_tgtport *lpfc_nvmet = targetport->private;
+	struct lpfc_hba *phba;
+	struct lpfc_nodelist *ndlp;
+	int ret;
+
+	phba = lpfc_nvmet->phba;
+	if (phba->pport->load_flag & FC_UNLOADING)
+		return;
+
+	ndlp = (struct lpfc_nodelist *)hosthandle;
+
+	ret = __lpfc_nvme_ls_abort(phba->pport, ndlp, pnvme_lsreq);
+	if (!ret)
+		atomic_inc(&lpfc_nvmet->xmt_ls_abort);
+}
+
 static void
 lpfc_nvmet_host_release(void *hosthandle)
 {
@@ -1325,6 +1417,8 @@ 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,
+	.ls_req         = lpfc_nvmet_ls_req,
+	.ls_abort       = lpfc_nvmet_ls_abort,
 	.host_release   = lpfc_nvmet_host_release,
 
 	.max_hw_queues  = 1,
@@ -1336,6 +1430,7 @@ static struct nvmet_fc_target_template lpfc_tgttemplate = {
 	.target_features = 0,
 	/* sizes of additional private data for data structures */
 	.target_priv_sz = sizeof(struct lpfc_nvmet_tgtport),
+	.lsrqst_priv_sz = 0,
 };
 
 static void
-- 
2.16.4


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