i40e: Fix the FD sideband logic to detect a FD table full condition
Hardware does not have a way of telling a PF how much of the global
shared FD table space is still available or is consumed.
Previously, every PF but PF0 would think there was still space available
when there wasn't. The PFs would continue to try to add filters and fail.
With this new logic if a filter programming error is detected we just
check if we are close to the guaranteed space full and that can be used
as a hint to say, there might not be space and we should turn off the
features. This way we can turn off the feature in SW for all PFs in
time.
Change-ID: I725cb2fab16c033f883056362b4542c1400503c5
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 5980d6b..17b1295 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -4944,7 +4944,20 @@
}
/**
- * i40e_get_current_fd_count - Get the count of FD filters programmed in the HW
+ * i40e_get_cur_guaranteed_fd_count - Get the consumed guaranteed FD filters
+ * @pf: board private structure
+ **/
+int i40e_get_cur_guaranteed_fd_count(struct i40e_pf *pf)
+{
+ int val, fcnt_prog;
+
+ val = rd32(&pf->hw, I40E_PFQF_FDSTAT);
+ fcnt_prog = (val & I40E_PFQF_FDSTAT_GUARANT_CNT_MASK);
+ return fcnt_prog;
+}
+
+/**
+ * i40e_get_current_fd_count - Get the count of total FD filters programmed
* @pf: board private structure
**/
int i40e_get_current_fd_count(struct i40e_pf *pf)
@@ -4956,7 +4969,6 @@
I40E_PFQF_FDSTAT_BEST_CNT_SHIFT);
return fcnt_prog;
}
-
/**
* i40e_fdir_check_and_reenable - Function to reenabe FD ATR or SB if disabled
* @pf: board private structure
@@ -4971,8 +4983,8 @@
if ((pf->flags & I40E_FLAG_FD_ATR_ENABLED) &&
(pf->flags & I40E_FLAG_FD_SB_ENABLED))
return;
- fcnt_prog = i40e_get_current_fd_count(pf);
- fcnt_avail = i40e_get_fd_cnt_all(pf);
+ fcnt_prog = i40e_get_cur_guaranteed_fd_count(pf);
+ fcnt_avail = pf->fdir_pf_filter_count;
if (fcnt_prog < (fcnt_avail - I40E_FDIR_BUFFER_HEAD_ROOM)) {
if ((pf->flags & I40E_FLAG_FD_SB_ENABLED) &&
(pf->auto_disable_flags & I40E_FLAG_FD_SB_ENABLED)) {