[PATCH 4/4] lpfc: Add support for vmid tagging of NVMe I/Os

[James Smart]

Modify the nvme io path to look for vmid support and call the
transport to obtain the io's appid value.

Signed-off-by: Gaurav Srivastava <gaurav.srivastava at broadcom.com>
Signed-off-by: James Smart <jsmart2021 at gmail.com>
---
 drivers/scsi/lpfc/lpfc_nvme.c | 45 +++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/drivers/scsi/lpfc/lpfc_nvme.c b/drivers/scsi/lpfc/lpfc_nvme.c
index 5385f4de5523..335e90633933 100644
--- a/drivers/scsi/lpfc/lpfc_nvme.c
+++ b/drivers/scsi/lpfc/lpfc_nvme.c
@@ -1279,6 +1279,19 @@ lpfc_nvme_prep_io_cmd(struct lpfc_vport *vport,
 
 	/* Words 13 14 15 are for PBDE support */
 
+	/* add the VMID tags as per switch response */
+	if (unlikely(lpfc_ncmd->cur_iocbq.cmd_flag & LPFC_IO_VMID)) {
+		if (phba->pport->vmid_priority_tagging) {
+			bf_set(wqe_ccpe, &wqe->fcp_iwrite.wqe_com, 1);
+			bf_set(wqe_ccp, &wqe->fcp_iwrite.wqe_com,
+			       lpfc_ncmd->cur_iocbq.vmid_tag.cs_ctl_vmid);
+		} else {
+			bf_set(wqe_appid, &wqe->fcp_iwrite.wqe_com, 1);
+			bf_set(wqe_wqes, &wqe->fcp_iwrite.wqe_com, 1);
+			wqe->words[31] = lpfc_ncmd->cur_iocbq.vmid_tag.app_id;
+		}
+	}
+
 	pwqeq->vport = vport;
 	return 0;
 }
@@ -1504,6 +1517,11 @@ lpfc_nvme_fcp_io_submit(struct nvme_fc_local_port *pnvme_lport,
 	struct lpfc_nvme_fcpreq_priv *freqpriv;
 	struct nvme_common_command *sqe;
 	uint64_t start = 0;
+#if (IS_ENABLED(CONFIG_NVME_FC))
+	u8 *uuid = NULL;
+	int err;
+	enum dma_data_direction iodir;
+#endif
 
 	/* Validate pointers. LLDD fault handling with transport does
 	 * have timing races.
@@ -1662,6 +1680,33 @@ lpfc_nvme_fcp_io_submit(struct nvme_fc_local_port *pnvme_lport,
 	lpfc_ncmd->ndlp = ndlp;
 	lpfc_ncmd->qidx = lpfc_queue_info->qidx;
 
+#if (IS_ENABLED(CONFIG_NVME_FC))
+	/* check the necessary and sufficient condition to support VMID */
+	if (lpfc_is_vmid_enabled(phba) &&
+	    (ndlp->vmid_support ||
+	     phba->pport->vmid_priority_tagging ==
+	     LPFC_VMID_PRIO_TAG_ALL_TARGETS)) {
+		/* is the I/O generated by a VM, get the associated virtual */
+		/* entity id */
+		uuid = nvme_fc_io_getuuid(pnvme_fcreq);
+
+		if (uuid) {
+			if (pnvme_fcreq->io_dir == NVMEFC_FCP_WRITE)
+				iodir = DMA_TO_DEVICE;
+			else if (pnvme_fcreq->io_dir == NVMEFC_FCP_READ)
+				iodir = DMA_FROM_DEVICE;
+			else
+				iodir = DMA_NONE;
+
+			err = lpfc_vmid_get_appid(vport, uuid, iodir,
+					(union lpfc_vmid_io_tag *)
+						&lpfc_ncmd->cur_iocbq.vmid_tag);
+			if (!err)
+				lpfc_ncmd->cur_iocbq.cmd_flag |= LPFC_IO_VMID;
+		}
+	}
+#endif
+
 	/*
 	 * Issue the IO on the WQ indicated by index in the hw_queue_handle.
 	 * This identfier was create in our hardware queue create callback
-- 
2.26.2