ice: Support link events, reset and rebuild

Link events are posted to a PF's admin receive queue (ARQ). This patch
adds the ability to detect and process link events.

This patch also adds the ability to process resets.

The driver can process the following resets:
    1) EMP Reset (EMPR)
    2) Global Reset (GLOBR)
    3) Core Reset (CORER)
    4) Physical Function Reset (PFR)

EMPR is the largest level of reset that the driver can handle. An EMPR
resets the manageability block and also the data path, including PHY and
link for all the PFs. The affected PFs are notified of this event through
a miscellaneous interrupt.

GLOBR is a subset of EMPR. It does everything EMPR does except that it
doesn't reset the manageability block.

CORER is a subset of GLOBR. It does everything GLOBR does but doesn't
reset PHY and link.

PFR is a subset of CORER and affects only the given physical function.
In other words, PFR can be thought of as a CORER for a single PF. Since
only the issuing PF is affected, a PFR doesn't result in the miscellaneous
interrupt being triggered.

All the resets have the following in common:
1) Tx/Rx is halted and all queues are stopped.
2) All the VSIs and filters programmed for the PF are lost and have to be
   reprogrammed.
3) Control queue interfaces are reset and have to be reprogrammed.

In the rebuild flow, control queues are reinitialized, VSIs are reallocated
and filters are restored.

Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index 0ab9bf66c84e..791f1eba5953 100644
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -1428,6 +1428,39 @@ out:
 }
 
 /**
+ * ice_get_link_status - get status of the HW network link
+ * @pi: port information structure
+ * @link_up: pointer to bool (true/false = linkup/linkdown)
+ *
+ * Variable link_up is true if link is up, false if link is down.
+ * The variable link_up is invalid if status is non zero. As a
+ * result of this call, link status reporting becomes enabled
+ */
+enum ice_status ice_get_link_status(struct ice_port_info *pi, bool *link_up)
+{
+        struct ice_phy_info *phy_info;
+        enum ice_status status = 0;
+
+        if (!pi)
+                return ICE_ERR_PARAM;
+
+        phy_info = &pi->phy;
+
+        if (phy_info->get_link_info) {
+                status = ice_update_link_info(pi);
+
+                if (status)
+                        ice_debug(pi->hw, ICE_DBG_LINK,
+                                  "get link status error, status = %d\n",
+                                  status);
+        }
+
+        *link_up = phy_info->link_info.link_info & ICE_AQ_LINK_UP;
+
+        return status;
+}
+
+/**
  * ice_aq_set_link_restart_an
  * @pi: pointer to the port information structure
  * @ena_link: if true: enable link, if false: disable link
@@ -1457,6 +1490,33 @@ ice_aq_set_link_restart_an(struct ice_port_info *pi, bool ena_link,
 }
 
 /**
+ * ice_aq_set_event_mask
+ * @hw: pointer to the hw struct
+ * @port_num: port number of the physical function
+ * @mask: event mask to be set
+ * @cd: pointer to command details structure or NULL
+ *
+ * Set event mask (0x0613)
+ */
+enum ice_status
+ice_aq_set_event_mask(struct ice_hw *hw, u8 port_num, u16 mask,
+                      struct ice_sq_cd *cd)
+{
+        struct ice_aqc_set_event_mask *cmd;
+        struct ice_aq_desc desc;
+
+        cmd = &desc.params.set_event_mask;
+
+        ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_set_event_mask);
+
+        cmd->lport_num = port_num;
+
+        cmd->event_mask = cpu_to_le16(mask);
+
+        return ice_aq_send_cmd(hw, &desc, NULL, 0, cd);
+}
+
+/**
  * __ice_aq_get_set_rss_lut
  * @hw: pointer to the hardware structure
  * @vsi_id: VSI FW index