netdev - [PATCH v3 bpf-next 02/11] ice: allow toggling loopback mode via ndo_set

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Date:   Wed, 15 Jun 2022 18:10:32 +0200
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net
Cc:     netdev@...r.kernel.org, magnus.karlsson@...el.com,
        bjorn@...nel.org,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Alexandr Lobakin <alexandr.lobakin@...el.com>
Subject: [PATCH v3 bpf-next 02/11] ice: allow toggling loopback mode via ndo_set_features callback

Add support for NETIF_F_LOOPBACK. This feature can be set via:
$ ethtool -K eth0 loopback <on|off>

Feature can be useful for local data path tests.

CC: Alexandr Lobakin <alexandr.lobakin@...el.com>
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 24 +++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 23d1b1fc39fb..85d956517b2e 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3358,6 +3358,7 @@ static void ice_set_netdev_features(struct net_device *netdev)
 	netdev->features |= netdev->hw_features;
 
 	netdev->hw_features |= NETIF_F_HW_TC;
+	netdev->hw_features |= NETIF_F_LOOPBACK;
 
 	/* encap and VLAN devices inherit default, csumo and tso features */
 	netdev->hw_enc_features |= dflt_features | csumo_features |
@@ -5902,6 +5903,25 @@ ice_set_vlan_features(struct net_device *netdev, netdev_features_t features)
 	return 0;
 }
 
+/**
+ * ice_set_loopback - turn on/off loopback mode on underlying PF
+ * @hw: ptr to ice_hw struct needed for AQ command
+ * @netdev: ptr to the netdev being adjusted
+ * @ena: flag to indicate the on/off setting
+ */
+static void
+ice_set_loopback(struct ice_hw *hw, struct net_device *netdev, bool ena)
+{
+	bool if_running = netif_running(netdev);
+
+	if (if_running)
+		ice_stop(netdev);
+	if (ice_aq_set_mac_loopback(hw, ena, NULL))
+		netdev_err(netdev, "Failed to toggle loopback state\n");
+	if (if_running)
+		ice_open(netdev);
+}
+
 /**
  * ice_set_features - set the netdev feature flags
  * @netdev: ptr to the netdev being adjusted
@@ -5960,6 +5980,10 @@ ice_set_features(struct net_device *netdev, netdev_features_t features)
 		      clear_bit(ICE_FLAG_CLS_FLOWER, pf->flags);
 	}
 
+	if (changed & NETIF_F_LOOPBACK)
+		ice_set_loopback(&pf->hw, netdev,
+				 !!(features & NETIF_F_LOOPBACK));
+
 	return 0;
 }
 
-- 
2.27.0