ice: clear VF ARQLEN register on reset

On older devices like X710 and X722, the VF's ARQLEN register is cleared
on reset, so the VF driver uses that register to detect an unannounced
reset. Unfortunately, on devices controlled by ice, this register is NOT
cleared on reset. This causes the VF to miss resets, and even on
properly-announced resets, the VF driver complains that it didn't see
the reset.

To fix this, we'll do it in software. When we handle a VF reset (whether
triggered by software or VFLR), clear this register after the HW reset
is complete.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
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>

diff --git a/drivers/net/ethernet/intel/ice/ice_hw_autogen.h b/drivers/net/ethernet/intel/ice/ice_hw_autogen.h
index f9a38f2..6bf5cc0 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_hw_autogen.h
+++ b/drivers/net/ethernet/intel/ice/ice_hw_autogen.h
@@ -30,6 +30,7 @@
 #define PF_FW_ATQLEN_ATQVFE_M                  BIT(28)
 #define PF_FW_ATQLEN_ATQOVFL_M                 BIT(29)
 #define PF_FW_ATQLEN_ATQCRIT_M                 BIT(30)
+#define VF_MBX_ARQLEN(_VF)                     (0x0022BC00 + ((_VF) * 4))
 #define PF_FW_ATQLEN_ATQENABLE_M               BIT(31)
 #define PF_FW_ATQT                             0x00080400
 #define PF_MBX_ARQBAH                          0x0022E400

diff --git a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
index 79d793a..458e179 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
@@ -310,6 +310,11 @@ static void ice_trigger_vf_reset(struct ice_vf *vf, bool is_vflr)
         */
        clear_bit(ICE_VF_STATE_INIT, vf->vf_states);
 
+       /* Clear the VF's ARQLEN register. This is how the VF detects reset,
+        * since the VFGEN_RSTAT register doesn't stick at 0 after reset.
+        */
+       wr32(hw, VF_MBX_ARQLEN(vf_abs_id), 0);
+
        /* In the case of a VFLR, the HW has already reset the VF and we
         * just need to clean up, so don't hit the VFRTRIG register.
         */