Add a knob that will allow user to turn the underlying net device into
loopback mode. The use case for this will be the AF_XDP ZC tests. Once
the device is in loopback mode, then it will be possible from AF_XDP
perspective to see if zero copy implementations in drivers work
properly.
The code for interaction with admin queue is reused from ethtool's
loopback test.
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
---
drivers/net/ethernet/intel/ice/ice.h | 1 +
drivers/net/ethernet/intel/ice/ice_ethtool.c | 17 +++++++++++++++++
2 files changed, 18 insertions(+)
diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index 60453b3b8d23..90c066f3782b 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -487,6 +487,7 @@ enum ice_pf_flags {
ICE_FLAG_PLUG_AUX_DEV,
ICE_FLAG_MTU_CHANGED,
ICE_FLAG_GNSS, /* GNSS successfully initialized */
+ ICE_FLAG_LOOPBACK,
ICE_PF_FLAGS_NBITS /* must be last */
};
diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index 1e71b70f0e52..cfc3c5e36907 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -166,6 +166,7 @@ static const struct ice_priv_flag ice_gstrings_priv_flags[] = {
ICE_PRIV_FLAG("mdd-auto-reset-vf", ICE_FLAG_MDD_AUTO_RESET_VF),
ICE_PRIV_FLAG("vf-vlan-pruning", ICE_FLAG_VF_VLAN_PRUNING),
ICE_PRIV_FLAG("legacy-rx", ICE_FLAG_LEGACY_RX),
+ ICE_PRIV_FLAG("loopback", ICE_FLAG_LOOPBACK),
};
#define ICE_PRIV_FLAG_ARRAY_SIZE ARRAY_SIZE(ice_gstrings_priv_flags)
@@ -1288,6 +1289,22 @@ static int ice_set_priv_flags(struct net_device *netdev, u32 flags)
ice_up(vsi);
}
}
+
+ if (test_bit(ICE_FLAG_LOOPBACK, change_flags)) {
+ if (!test_bit(ICE_FLAG_LOOPBACK, orig_flags)) {
+ /* Enable MAC loopback in firmware */
+ if (ice_aq_set_mac_loopback(&pf->hw, true, NULL)) {
+ dev_err(dev, "Failed to enable loopback\n");
+ ret = -ENXIO;
+ }
+ } else {
+ /* Disable MAC loopback in firmware */
+ if (ice_aq_set_mac_loopback(&pf->hw, false, NULL)) {
+ dev_err(dev, "Failed to disable loopback\n");
+ ret = -ENXIO;
+ }
+ }
+ }
/* don't allow modification of this flag when a single VF is in
* promiscuous mode because it's not supported
*/
--
2.27.0
