lpfc: add sysfs interface to post NVME RSCN

To support scenarios which aren't bound to nvmetcli add port scenarios,
which is currently where the nvmet_fc transport invokes the discovery
event callbacks, a syfs attribute is added to lpfc which can be written
to cause an RSCN to be generated for the nport.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
index 14293c5..2c3bb8a 100644 (file)
--- a/drivers/scsi/lpfc/lpfc.h
+++ b/drivers/scsi/lpfc/lpfc.h
@@ -820,6 +820,7 @@ struct lpfc_hba {
        uint32_t cfg_use_msi;
        uint32_t cfg_auto_imax;
        uint32_t cfg_fcp_imax;
+       uint32_t cfg_force_rscn;
        uint32_t cfg_cq_poll_threshold;
        uint32_t cfg_cq_max_proc_limit;
        uint32_t cfg_fcp_cpu_map;

diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index d4c65e2..2bd1e01 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -4959,6 +4959,64 @@ static DEVICE_ATTR(lpfc_req_fw_upgrade, S_IRUGO | S_IWUSR,
                   lpfc_request_firmware_upgrade_store);
 
 /**
+ * lpfc_force_rscn_store
+ *
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: unused string
+ * @count: unused variable.
+ *
+ * Description:
+ * Force the switch to send a RSCN to all other NPorts in our zone
+ * If we are direct connect pt2pt, build the RSCN command ourself
+ * and send to the other NPort. Not supported for private loop.
+ *
+ * Returns:
+ * 0      - on success
+ * -EIO   - if command is not sent
+ **/
+static ssize_t
+lpfc_force_rscn_store(struct device *dev, struct device_attribute *attr,
+                     const char *buf, size_t count)
+{
+       struct Scsi_Host *shost = class_to_shost(dev);
+       struct lpfc_vport *vport = (struct lpfc_vport *)shost->hostdata;
+       int i;
+
+       i = lpfc_issue_els_rscn(vport, 0);
+       if (i)
+               return -EIO;
+       return strlen(buf);
+}
+
+/*
+ * lpfc_force_rscn: Force an RSCN to be sent to all remote NPorts
+ * connected to  the HBA.
+ *
+ * Value range is any ascii value
+ */
+static int lpfc_force_rscn;
+module_param(lpfc_force_rscn, int, 0644);
+MODULE_PARM_DESC(lpfc_force_rscn,
+                "Force an RSCN to be sent to all remote NPorts");
+lpfc_param_show(force_rscn)
+
+/**
+ * lpfc_force_rscn_init - Force an RSCN to be sent to all remote NPorts
+ * @phba: lpfc_hba pointer.
+ * @val: unused value.
+ *
+ * Returns:
+ * zero if val saved.
+ **/
+static int
+lpfc_force_rscn_init(struct lpfc_hba *phba, int val)
+{
+       return 0;
+}
+static DEVICE_ATTR_RW(lpfc_force_rscn);
+
+/**
  * lpfc_fcp_imax_store
  *
  * @dev: class device that is converted into a Scsi_host.
@@ -5958,6 +6016,7 @@ struct device_attribute *lpfc_hba_attrs[] = {
        &dev_attr_lpfc_nvme_oas,
        &dev_attr_lpfc_nvme_embed_cmd,
        &dev_attr_lpfc_fcp_imax,
+       &dev_attr_lpfc_force_rscn,
        &dev_attr_lpfc_cq_poll_threshold,
        &dev_attr_lpfc_cq_max_proc_limit,
        &dev_attr_lpfc_fcp_cpu_map,
@@ -7005,6 +7064,7 @@ lpfc_get_cfgparam(struct lpfc_hba *phba)
        lpfc_nvme_oas_init(phba, lpfc_nvme_oas);
        lpfc_nvme_embed_cmd_init(phba, lpfc_nvme_embed_cmd);
        lpfc_fcp_imax_init(phba, lpfc_fcp_imax);
+       lpfc_force_rscn_init(phba, lpfc_force_rscn);
        lpfc_cq_poll_threshold_init(phba, lpfc_cq_poll_threshold);
        lpfc_cq_max_proc_limit_init(phba, lpfc_cq_max_proc_limit);
        lpfc_fcp_cpu_map_init(phba, lpfc_fcp_cpu_map);