netdev - [PATCH v2 bpf-next 01/10] ice: allow toggling loopback mode via ndo_set

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Date:   Tue, 14 Jun 2022 19:47:40 +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 v2 bpf-next 01/10] ice: allow toggling loopback mode via ndo_set_features callback

Add support for NETIF_F_LOOPBACK. Also, simplify checks throughout whole
ice_set_features().

CC: Alexandr Lobakin <alexandr.lobakin@...el.com>
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 54 ++++++++++++++---------
 1 file changed, 34 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index e1cae253412c..ab00b0361e87 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 +5903,18 @@ ice_set_vlan_features(struct net_device *netdev, netdev_features_t features)
 	return 0;
 }
 
+static void ice_set_loopback(struct ice_pf *pf, struct net_device *netdev, bool ena)
+{
+	bool if_running = netif_running(netdev);
+
+	if (if_running)
+		ice_stop(netdev);
+	if (ice_aq_set_mac_loopback(&pf->hw, ena, NULL))
+		dev_err(ice_pf_to_dev(pf), "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
@@ -5910,6 +5923,7 @@ ice_set_vlan_features(struct net_device *netdev, netdev_features_t features)
 static int
 ice_set_features(struct net_device *netdev, netdev_features_t features)
 {
+	netdev_features_t changed = netdev->features ^ features;
 	struct ice_netdev_priv *np = netdev_priv(netdev);
 	struct ice_vsi *vsi = np->vsi;
 	struct ice_pf *pf = vsi->back;
@@ -5917,37 +5931,33 @@ ice_set_features(struct net_device *netdev, netdev_features_t features)
 
 	/* Don't set any netdev advanced features with device in Safe Mode */
 	if (ice_is_safe_mode(vsi->back)) {
-		dev_err(ice_pf_to_dev(vsi->back), "Device is in Safe Mode - not enabling advanced netdev features\n");
+		dev_err(ice_pf_to_dev(vsi->back),
+			"Device is in Safe Mode - not enabling advanced netdev features\n");
 		return ret;
 	}
 
 	/* Do not change setting during reset */
 	if (ice_is_reset_in_progress(pf->state)) {
-		dev_err(ice_pf_to_dev(vsi->back), "Device is resetting, changing advanced netdev features temporarily unavailable.\n");
+		dev_err(ice_pf_to_dev(vsi->back),
+			"Device is resetting, changing advanced netdev features temporarily unavailable.\n");
 		return -EBUSY;
 	}
 
 	/* Multiple features can be changed in one call so keep features in
 	 * separate if/else statements to guarantee each feature is checked
 	 */
-	if (features & NETIF_F_RXHASH && !(netdev->features & NETIF_F_RXHASH))
-		ice_vsi_manage_rss_lut(vsi, true);
-	else if (!(features & NETIF_F_RXHASH) &&
-		 netdev->features & NETIF_F_RXHASH)
-		ice_vsi_manage_rss_lut(vsi, false);
+	if (changed & NETIF_F_RXHASH)
+		ice_vsi_manage_rss_lut(vsi, !!(features & NETIF_F_RXHASH));
 
 	ret = ice_set_vlan_features(netdev, features);
 	if (ret)
 		return ret;
 
-	if ((features & NETIF_F_NTUPLE) &&
-	    !(netdev->features & NETIF_F_NTUPLE)) {
-		ice_vsi_manage_fdir(vsi, true);
-		ice_init_arfs(vsi);
-	} else if (!(features & NETIF_F_NTUPLE) &&
-		 (netdev->features & NETIF_F_NTUPLE)) {
-		ice_vsi_manage_fdir(vsi, false);
-		ice_clear_arfs(vsi);
+	if (changed & NETIF_F_NTUPLE) {
+		bool ena = !!(features & NETIF_F_NTUPLE);
+
+		ice_vsi_manage_fdir(vsi, ena);
+		ena ? ice_init_arfs(vsi) : ice_clear_arfs(vsi);
 	}
 
 	/* don't turn off hw_tc_offload when ADQ is already enabled */
@@ -5956,11 +5966,15 @@ ice_set_features(struct net_device *netdev, netdev_features_t features)
 		return -EACCES;
 	}
 
-	if ((features & NETIF_F_HW_TC) &&
-	    !(netdev->features & NETIF_F_HW_TC))
-		set_bit(ICE_FLAG_CLS_FLOWER, pf->flags);
-	else
-		clear_bit(ICE_FLAG_CLS_FLOWER, pf->flags);
+	if (changed & NETIF_F_HW_TC) {
+		bool ena = !!(features & NETIF_F_HW_TC);
+
+		ena ? set_bit(ICE_FLAG_CLS_FLOWER, pf->flags) :
+		      clear_bit(ICE_FLAG_CLS_FLOWER, pf->flags);
+	}
+
+	if (changed & NETIF_F_LOOPBACK)
+		ice_set_loopback(pf, netdev, !!(features & NETIF_F_LOOPBACK));
 
 	return 0;
 }
-- 
2.27.0