scsi: lpfc: add Trunking support

Add trunking support to the driver. Trunking is found on more recent
asics. In general, trunking appears as a single "port" to the driver
and overall behavior doesn't differ. Link speed is reported as an
aggregate value, while link speed control is done on a per-physical
link basis with all links in the trunk symmetrical. Some commands
returning port information are updated to additionally provide
trunking information. And new ACQEs are generated to report physical
link events relative to the trunk.

This patch contains the following modifications:

- Added link speed settings of 128GB and 256GB.

- Added handling of trunk-related ACQEs, mainly logging and trapping
  of physical link statuses.

- Added additional bsg interface to query trunk state by applications.

- Augment link_state sysfs attribtute to display trunk link status

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 101 insertions, 0 deletions

diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index 1b19e8c6d7f3..fdc706fc0209 100644
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -883,6 +883,42 @@ lpfc_link_state_show(struct device *dev, struct device_attribute *attr,
 		}
 	}
 
+	if ((phba->sli_rev == LPFC_SLI_REV4) &&
+	    ((bf_get(lpfc_sli_intf_if_type,
+	     &phba->sli4_hba.sli_intf) ==
+	     LPFC_SLI_INTF_IF_TYPE_6))) {
+		struct lpfc_trunk_link link = phba->trunk_link;
+
+		if (bf_get(lpfc_conf_trunk_port0, &phba->sli4_hba))
+			len += snprintf(buf + len, PAGE_SIZE - len,
+				"Trunk port 0: Link %s %s\n",
+				(link.link0.state == LPFC_LINK_UP) ?
+				 "Up" : "Down. ",
+				trunk_errmsg[link.link0.fault]);
+
+		if (bf_get(lpfc_conf_trunk_port1, &phba->sli4_hba))
+			len += snprintf(buf + len, PAGE_SIZE - len,
+				"Trunk port 1: Link %s %s\n",
+				(link.link1.state == LPFC_LINK_UP) ?
+				 "Up" : "Down. ",
+				trunk_errmsg[link.link1.fault]);
+
+		if (bf_get(lpfc_conf_trunk_port2, &phba->sli4_hba))
+			len += snprintf(buf + len, PAGE_SIZE - len,
+				"Trunk port 2: Link %s %s\n",
+				(link.link2.state == LPFC_LINK_UP) ?
+				 "Up" : "Down. ",
+				trunk_errmsg[link.link2.fault]);
+
+		if (bf_get(lpfc_conf_trunk_port3, &phba->sli4_hba))
+			len += snprintf(buf + len, PAGE_SIZE - len,
+				"Trunk port 3: Link %s %s\n",
+				(link.link3.state == LPFC_LINK_UP) ?
+				 "Up" : "Down. ",
+				trunk_errmsg[link.link3.fault]);
+
+	}
+
 	return len;
 }
 
@@ -1430,6 +1466,66 @@ lpfc_nport_evt_cnt_show(struct device *dev, struct device_attribute *attr,
 	return snprintf(buf, PAGE_SIZE, "%d\n", phba->nport_event_cnt);
 }
 
+int
+lpfc_set_trunking(struct lpfc_hba *phba, char *buff_out)
+{
+	LPFC_MBOXQ_t *mbox = NULL;
+	unsigned long val = 0;
+	char *pval = 0;
+	int rc = 0;
+
+	if (!strncmp("enable", buff_out,
+				 strlen("enable"))) {
+		pval = buff_out + strlen("enable") + 1;
+		rc = kstrtoul(pval, 0, &val);
+		if (rc)
+			return rc; /* Invalid  number */
+	} else if (!strncmp("disable", buff_out,
+				 strlen("disable"))) {
+		val = 0;
+	} else {
+		return -EINVAL;  /* Invalid command */
+	}
+
+	switch (val) {
+	case 0:
+		val = 0x0; /* Disable */
+		break;
+	case 2:
+		val = 0x1; /* Enable two port trunk */
+		break;
+	case 4:
+		val = 0x2; /* Enable four port trunk */
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	lpfc_printf_log(phba, KERN_ERR, LOG_MBOX,
+			"0070 Set trunk mode with val %ld ", val);
+
+	mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
+	if (!mbox)
+		return -ENOMEM;
+
+	lpfc_sli4_config(phba, mbox, LPFC_MBOX_SUBSYSTEM_FCOE,
+			 LPFC_MBOX_OPCODE_FCOE_FC_SET_TRUNK_MODE,
+			 12, LPFC_SLI4_MBX_EMBED);
+
+	bf_set(lpfc_mbx_set_trunk_mode,
+	       &mbox->u.mqe.un.set_trunk_mode,
+	       val);
+	rc = lpfc_sli_issue_mbox(phba, mbox, MBX_POLL);
+	if (rc)
+		lpfc_printf_log(phba, KERN_ERR, LOG_MBOX,
+				"0071 Set trunk mode failed with status: %d",
+				rc);
+	if (rc != MBX_TIMEOUT)
+		mempool_free(mbox, phba->mbox_mem_pool);
+
+	return 0;
+}
+
 /**
  * lpfc_board_mode_show - Return the state of the board
  * @dev: class device that is converted into a Scsi_host.
@@ -1522,6 +1618,8 @@ lpfc_board_mode_store(struct device *dev, struct device_attribute *attr,
 		status = lpfc_sli4_pdev_reg_request(phba, LPFC_FW_RESET);
 	else if (strncmp(buf, "dv_reset", sizeof("dv_reset") - 1) == 0)
 		status = lpfc_sli4_pdev_reg_request(phba, LPFC_DV_RESET);
+	else if (strncmp(buf, "trunk", sizeof("trunk") - 1) == 0)
+		status = lpfc_set_trunking(phba, (char *)buf + sizeof("trunk"));
 	else
 		status = -EINVAL;
 
@@ -6019,6 +6117,9 @@ lpfc_get_host_speed(struct Scsi_Host *shost)
 		case LPFC_LINK_SPEED_64GHZ:
 			fc_host_speed(shost) = FC_PORTSPEED_64GBIT;
 			break;
+		case LPFC_LINK_SPEED_128GHZ:
+			fc_host_speed(shost) = FC_PORTSPEED_128GBIT;
+			break;
 		default:
 			fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 			break;