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, 148 insertions, 0 deletions

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 4ddf0a9ca188..fcf9042180b4 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -4108,6 +4108,8 @@ void lpfc_host_supported_speeds_set(struct Scsi_Host *shost)
 	struct lpfc_hba   *phba = vport->phba;
 
 	fc_host_supported_speeds(shost) = 0;
+	if (phba->lmt & LMT_128Gb)
+		fc_host_supported_speeds(shost) |= FC_PORTSPEED_128GBIT;
 	if (phba->lmt & LMT_64Gb)
 		fc_host_supported_speeds(shost) |= FC_PORTSPEED_64GBIT;
 	if (phba->lmt & LMT_32Gb)
@@ -4471,6 +4473,9 @@ lpfc_sli4_port_speed_parse(struct lpfc_hba *phba, uint32_t evt_code,
 		case LPFC_FC_LA_SPEED_64G:
 			port_speed = 64000;
 			break;
+		case LPFC_FC_LA_SPEED_128G:
+			port_speed = 128000;
+			break;
 		default:
 			port_speed = 0;
 		}
@@ -4613,6 +4618,140 @@ out_free_pmb:
 }
 
 /**
+ * lpfc_async_link_speed_to_read_top - Parse async evt link speed code to read
+ * topology.
+ * @phba: pointer to lpfc hba data structure.
+ * @evt_code: asynchronous event code.
+ * @speed_code: asynchronous event link speed code.
+ *
+ * This routine is to parse the giving SLI4 async event link speed code into
+ * value of Read topology link speed.
+ *
+ * Return: link speed in terms of Read topology.
+ **/
+static uint8_t
+lpfc_async_link_speed_to_read_top(struct lpfc_hba *phba, uint8_t speed_code)
+{
+	uint8_t port_speed;
+
+	switch (speed_code) {
+	case LPFC_FC_LA_SPEED_1G:
+		port_speed = LPFC_LINK_SPEED_1GHZ;
+		break;
+	case LPFC_FC_LA_SPEED_2G:
+		port_speed = LPFC_LINK_SPEED_2GHZ;
+		break;
+	case LPFC_FC_LA_SPEED_4G:
+		port_speed = LPFC_LINK_SPEED_4GHZ;
+		break;
+	case LPFC_FC_LA_SPEED_8G:
+		port_speed = LPFC_LINK_SPEED_8GHZ;
+		break;
+	case LPFC_FC_LA_SPEED_16G:
+		port_speed = LPFC_LINK_SPEED_16GHZ;
+		break;
+	case LPFC_FC_LA_SPEED_32G:
+		port_speed = LPFC_LINK_SPEED_32GHZ;
+		break;
+	case LPFC_FC_LA_SPEED_64G:
+		port_speed = LPFC_LINK_SPEED_64GHZ;
+		break;
+	case LPFC_FC_LA_SPEED_128G:
+		port_speed = LPFC_LINK_SPEED_128GHZ;
+		break;
+	case LPFC_FC_LA_SPEED_256G:
+		port_speed = LPFC_LINK_SPEED_256GHZ;
+		break;
+	default:
+		port_speed = 0;
+		break;
+	}
+
+	return port_speed;
+}
+
+#define trunk_link_status(__idx)\
+	bf_get(lpfc_acqe_fc_la_trunk_config_port##__idx, acqe_fc) ?\
+	       ((phba->trunk_link.link##__idx.state == LPFC_LINK_UP) ?\
+		"Link up" : "Link down") : "NA"
+/* Did port __idx reported an error */
+#define trunk_port_fault(__idx)\
+	bf_get(lpfc_acqe_fc_la_trunk_config_port##__idx, acqe_fc) ?\
+	       (port_fault & (1 << __idx) ? "YES" : "NO") : "NA"
+
+static void
+lpfc_update_trunk_link_status(struct lpfc_hba *phba,
+			      struct lpfc_acqe_fc_la *acqe_fc)
+{
+	uint8_t port_fault = bf_get(lpfc_acqe_fc_la_trunk_linkmask, acqe_fc);
+	uint8_t err = bf_get(lpfc_acqe_fc_la_trunk_fault, acqe_fc);
+
+	phba->sli4_hba.link_state.speed =
+		lpfc_sli4_port_speed_parse(phba, LPFC_TRAILER_CODE_FC,
+				bf_get(lpfc_acqe_fc_la_speed, acqe_fc));
+
+	phba->sli4_hba.link_state.logical_speed =
+				bf_get(lpfc_acqe_fc_la_llink_spd, acqe_fc);
+	/* We got FC link speed, convert to fc_linkspeed (READ_TOPOLOGY) */
+	phba->fc_linkspeed =
+		 lpfc_async_link_speed_to_read_top(
+				phba,
+				bf_get(lpfc_acqe_fc_la_speed, acqe_fc));
+
+	if (bf_get(lpfc_acqe_fc_la_trunk_config_port0, acqe_fc)) {
+		phba->trunk_link.link0.state =
+			bf_get(lpfc_acqe_fc_la_trunk_link_status_port0, acqe_fc)
+			? LPFC_LINK_UP : LPFC_LINK_DOWN;
+		if (port_fault & 0x1)
+			phba->trunk_link.link0.fault = err;
+	}
+	if (bf_get(lpfc_acqe_fc_la_trunk_config_port1, acqe_fc)) {
+		phba->trunk_link.link1.state =
+			bf_get(lpfc_acqe_fc_la_trunk_link_status_port1, acqe_fc)
+			? LPFC_LINK_UP : LPFC_LINK_DOWN;
+		if (port_fault & 0x2)
+			phba->trunk_link.link1.fault = err;
+	}
+	if (bf_get(lpfc_acqe_fc_la_trunk_config_port2, acqe_fc)) {
+		phba->trunk_link.link2.state =
+			bf_get(lpfc_acqe_fc_la_trunk_link_status_port2, acqe_fc)
+			? LPFC_LINK_UP : LPFC_LINK_DOWN;
+		if (port_fault & 0x4)
+			phba->trunk_link.link2.fault = err;
+	}
+	if (bf_get(lpfc_acqe_fc_la_trunk_config_port3, acqe_fc)) {
+		phba->trunk_link.link3.state =
+			bf_get(lpfc_acqe_fc_la_trunk_link_status_port3, acqe_fc)
+			? LPFC_LINK_UP : LPFC_LINK_DOWN;
+		if (port_fault & 0x8)
+			phba->trunk_link.link3.fault = err;
+	}
+
+	lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
+			"2910 Async FC Trunking Event - Speed:%d\n"
+			"\tLogical speed:%d "
+			"port0: %s port1: %s port2: %s port3: %s\n",
+			phba->sli4_hba.link_state.speed,
+			phba->sli4_hba.link_state.logical_speed,
+			trunk_link_status(0), trunk_link_status(1),
+			trunk_link_status(2), trunk_link_status(3));
+
+	if (port_fault)
+		lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
+				"3202 trunk error:0x%x (%s) seen on port0:%s "
+				/*
+				 * SLI-4: We have only 0xA error codes
+				 * defined as of now. print an appropriate
+				 * message in case driver needs to be updated.
+				 */
+				"port1:%s port2:%s port3:%s\n", err, err > 0xA ?
+				"UNDEFINED. update driver." : trunk_errmsg[err],
+				trunk_port_fault(0), trunk_port_fault(1),
+				trunk_port_fault(2), trunk_port_fault(3));
+}
+
+
+/**
  * lpfc_sli4_async_fc_evt - Process the asynchronous FC link event
  * @phba: pointer to lpfc hba data structure.
  * @acqe_fc: pointer to the async fc completion queue entry.
@@ -4637,6 +4776,13 @@ lpfc_sli4_async_fc_evt(struct lpfc_hba *phba, struct lpfc_acqe_fc_la *acqe_fc)
 				bf_get(lpfc_trailer_type, acqe_fc));
 		return;
 	}
+
+	if (bf_get(lpfc_acqe_fc_la_att_type, acqe_fc) ==
+	    LPFC_FC_LA_TYPE_TRUNKING_EVENT) {
+		lpfc_update_trunk_link_status(phba, acqe_fc);
+		return;
+	}
+
 	/* Keep the link status for extra SLI4 state machine reference */
 	phba->sli4_hba.link_state.speed =
 			lpfc_sli4_port_speed_parse(phba, LPFC_TRAILER_CODE_FC,
@@ -7804,6 +7950,8 @@ lpfc_sli4_read_config(struct lpfc_hba *phba)
 			phba->sli4_hba.bbscn_params.word0 = rd_config->word8;
 		}
 
+		phba->sli4_hba.conf_trunk =
+			bf_get(lpfc_mbx_rd_conf_trunk, rd_config);
 		phba->sli4_hba.extents_in_use =
 			bf_get(lpfc_mbx_rd_conf_extnts_inuse, rd_config);
 		phba->sli4_hba.max_cfg_param.max_xri =