fm10k/base: document ITR scale workaround

[dpdk.git] / drivers / net / fm10k / base / fm10k_pf.c

diff --git a/drivers/net/fm10k/base/fm10k_pf.c b/drivers/net/fm10k/base/fm10k_pf.c
index 5b8c039..6de679e 100644 (file)
--- a/drivers/net/fm10k/base/fm10k_pf.c
+++ b/drivers/net/fm10k/base/fm10k_pf.c
@@ -958,7 +958,8 @@ STATIC s32 fm10k_iov_assign_default_mac_vlan_pf(struct fm10k_hw *hw,
        FM10K_WRITE_REG(hw, FM10K_TDBAH(vf_q_idx), tdbah);
 
        /* Provide the VF the ITR scale, using software-defined fields in TDLEN
-        * to pass the information during VF initialization
+        * to pass the information during VF initialization. See definition of
+        * FM10K_TDLEN_ITR_SCALE_SHIFT for more details.
         */
        FM10K_WRITE_REG(hw, FM10K_TDLEN(vf_q_idx), hw->mac.itr_scale <<
                                                   FM10K_TDLEN_ITR_SCALE_SHIFT);
@@ -1095,6 +1096,9 @@ STATIC s32 fm10k_iov_reset_resources_pf(struct fm10k_hw *hw,
        for (i = queues_per_pool; i--;) {
                FM10K_WRITE_REG(hw, FM10K_TDBAL(vf_q_idx + i), tdbal);
                FM10K_WRITE_REG(hw, FM10K_TDBAH(vf_q_idx + i), tdbah);
+               /* See definition of FM10K_TDLEN_ITR_SCALE_SHIFT for an
+                * explanation of how TDLEN is used.
+                */
                FM10K_WRITE_REG(hw, FM10K_TDLEN(vf_q_idx + i),
                                hw->mac.itr_scale <<
                                FM10K_TDLEN_ITR_SCALE_SHIFT);