bnxt_en: implement devlink dev reload fw_activate

Similar to reload driver_reinit, the RTNL lock is held across reload
down and up to prevent interleaving state changes.  But we need to
subsequently release the RTNL lock while waiting for firmware reset
to complete.

Also keep a statistic on fw_activate resets initiated remotely from
other functions.

Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 55 insertions, 1 deletions

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
index d875469f72ce..9922c1428129 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
@@ -327,6 +327,30 @@ static int bnxt_dl_reload_down(struct devlink *dl, bool netns_change,
 		bp->ctx = NULL;
 		break;
 	}
+	case DEVLINK_RELOAD_ACTION_FW_ACTIVATE: {
+		if (~bp->fw_cap & BNXT_FW_CAP_HOT_RESET) {
+			NL_SET_ERR_MSG_MOD(extack, "Device not capable, requires reboot");
+			return -EOPNOTSUPP;
+		}
+		rtnl_lock();
+		if (bp->dev->reg_state == NETREG_UNREGISTERED) {
+			rtnl_unlock();
+			return -ENODEV;
+		}
+		if (netif_running(bp->dev))
+			set_bit(BNXT_STATE_FW_ACTIVATE, &bp->state);
+		rc = bnxt_hwrm_firmware_reset(bp->dev,
+					      FW_RESET_REQ_EMBEDDED_PROC_TYPE_CHIP,
+					      FW_RESET_REQ_SELFRST_STATUS_SELFRSTASAP,
+					      FW_RESET_REQ_FLAGS_RESET_GRACEFUL |
+					      FW_RESET_REQ_FLAGS_FW_ACTIVATION);
+		if (rc) {
+			NL_SET_ERR_MSG_MOD(extack, "Failed to activate firmware");
+			clear_bit(BNXT_STATE_FW_ACTIVATE, &bp->state);
+			rtnl_unlock();
+		}
+		break;
+	}
 	default:
 		rc = -EOPNOTSUPP;
 	}
@@ -355,6 +379,35 @@ static int bnxt_dl_reload_up(struct devlink *dl, enum devlink_reload_action acti
 		}
 		break;
 	}
+	case DEVLINK_RELOAD_ACTION_FW_ACTIVATE: {
+		unsigned long start = jiffies;
+		unsigned long timeout = start + BNXT_DFLT_FW_RST_MAX_DSECS * HZ / 10;
+
+		if (bp->fw_cap & BNXT_FW_CAP_ERROR_RECOVERY)
+			timeout = start + bp->fw_health->normal_func_wait_dsecs * HZ / 10;
+		if (!netif_running(bp->dev))
+			NL_SET_ERR_MSG_MOD(extack,
+					   "Device is closed, not waiting for reset notice that will never come");
+		rtnl_unlock();
+		while (test_bit(BNXT_STATE_FW_ACTIVATE, &bp->state)) {
+			if (time_after(jiffies, timeout)) {
+				NL_SET_ERR_MSG_MOD(extack, "Activation incomplete");
+				rc = -ETIMEDOUT;
+				break;
+			}
+			if (test_bit(BNXT_STATE_ABORT_ERR, &bp->state)) {
+				NL_SET_ERR_MSG_MOD(extack, "Activation aborted");
+				rc = -ENODEV;
+				break;
+			}
+			msleep(50);
+		}
+		rtnl_lock();
+		if (!rc)
+			*actions_performed |= BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT);
+		clear_bit(BNXT_STATE_FW_ACTIVATE, &bp->state);
+		break;
+	}
 	default:
 		return -EOPNOTSUPP;
 	}
@@ -381,7 +434,8 @@ static const struct devlink_ops bnxt_dl_ops = {
 #endif /* CONFIG_BNXT_SRIOV */
 	.info_get	  = bnxt_dl_info_get,
 	.flash_update	  = bnxt_dl_flash_update,
-	.reload_actions	  = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT),
+	.reload_actions	  = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT) |
+			    BIT(DEVLINK_RELOAD_ACTION_FW_ACTIVATE),
 	.reload_down	  = bnxt_dl_reload_down,
 	.reload_up	  = bnxt_dl_reload_up,
 };