ice: Add code for DCB initialization part 3/4

This patch adds a new function ice_pf_dcb_cfg (and related helpers)
which applies the DCB configuration obtained from the firmware. As
part of this, VSIs/netdevs are updated with traffic class information.

This patch requires a bit of a refactor of existing code.

1. For a MIB change event, the associated VSI is closed and brought up
   again. The gap between closing and opening the VSI can cause a race
   condition. Fix this by grabbing the rtnl_lock prior to closing the
   VSI and then only free it after re-opening the VSI during a MIB
   change event.

2. ice_sched_query_elem is used in ice_sched.c and with this patch, in
   ice_dcb.c as well. However, ice_dcb.c is not built when CONFIG_DCB is
   unset. This results in namespace warnings (ice_sched.o: Externally
   defined symbols with no external references) when CONFIG_DCB is unset.
   To avoid this move ice_sched_query_elem from ice_sched.c to
   ice_common.c.

Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index 3730daf1bc1a..2937c6be1aee 100644
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -3106,3 +3106,28 @@ ice_stat_update32(struct ice_hw *hw, u32 reg, bool prev_stat_loaded,
                 /* to manage the potential roll-over */
                 *cur_stat = (new_data + BIT_ULL(32)) - *prev_stat;
 }
+
+/**
+ * ice_sched_query_elem - query element information from HW
+ * @hw: pointer to the HW struct
+ * @node_teid: node TEID to be queried
+ * @buf: buffer to element information
+ *
+ * This function queries HW element information
+ */
+enum ice_status
+ice_sched_query_elem(struct ice_hw *hw, u32 node_teid,
+                     struct ice_aqc_get_elem *buf)
+{
+        u16 buf_size, num_elem_ret = 0;
+        enum ice_status status;
+
+        buf_size = sizeof(*buf);
+        memset(buf, 0, buf_size);
+        buf->generic[0].node_teid = cpu_to_le32(node_teid);
+        status = ice_aq_query_sched_elems(hw, 1, buf, buf_size, &num_elem_ret,
+                                          NULL);
+        if (status || num_elem_ret != 1)
+                ice_debug(hw, ICE_DBG_SCHED, "query element failed\n");
+        return status;
+}