netdev_features: convert NETIF_F_LLTX to dev->lltx

NETIF_F_LLTX can't be changed via Ethtool and is not a feature,
rather an attribute, very similar to IFF_NO_QUEUE (and hot).
Free one netdev_features_t bit and make it a "hot" private flag.

Signed-off-by: Alexander Lobakin <[e-mail]>
Signed-off-by: Paolo Abeni <[e-mail]>

Documentation/networking/net_cachelines/net_device.rst

···
 Type                                Name                    fastpath_tx_access  fastpath_rx_access  Comments
 ..struct                            ..net_device                                                    
 unsigned_long:32                    priv_flags              read_mostly         -                   __dev_queue_xmit(tx)
+unsigned_long:1                     lltx                    read_mostly         -                   HARD_TX_LOCK,HARD_TX_TRYLOCK,HARD_TX_UNLOCK(tx)
 char                                name[16]                -                   -                   
 struct_netdev_name_node*            name_node                                                       
 struct_dev_ifalias*                 ifalias                                                         

Documentation/networking/netdev-features.rst

···
 Features contained in NETIF_F_SOFT_FEATURES are features of networking
 stack. Driver should not change behaviour based on them.
 
- * LLTX driver (deprecated for hardware drivers)
-
-NETIF_F_LLTX is meant to be used by drivers that don't need locking at all,
-e.g. software tunnels.
-
-This is also used in a few legacy drivers that implement their
-own locking, don't use it for new (hardware) drivers.
-
  * netns-local device
 
 NETIF_F_NETNS_LOCAL is set for devices that are not allowed to move between

Documentation/networking/netdevices.rst

···
 ndo_start_xmit:
 	Synchronization: __netif_tx_lock spinlock.
 
-	When the driver sets NETIF_F_LLTX in dev->features this will be
+	When the driver sets dev->lltx this will be
 	called without holding netif_tx_lock. In this case the driver
 	has to lock by itself when needed.
 	The locking there should also properly protect against
-	set_rx_mode. WARNING: use of NETIF_F_LLTX is deprecated.
+	set_rx_mode. WARNING: use of dev->lltx is deprecated.
 	Don't use it for new drivers.
 
 	Context: Process with BHs disabled or BH (timer),

drivers/net/amt.c

···
 	dev->hard_header_len	= 0;
 	dev->addr_len		= 0;
 	dev->priv_flags		|= IFF_NO_QUEUE;
-	dev->features		|= NETIF_F_LLTX;
+	dev->lltx		= true;
 	dev->features		|= NETIF_F_GSO_SOFTWARE;
 	dev->features		|= NETIF_F_NETNS_LOCAL;
 	dev->hw_features	|= NETIF_F_SG | NETIF_F_HW_CSUM;

drivers/net/bareudp.c

···
 	SET_NETDEV_DEVTYPE(dev, &bareudp_type);
 	dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
 	dev->features    |= NETIF_F_RXCSUM;
-	dev->features    |= NETIF_F_LLTX;
 	dev->features    |= NETIF_F_GSO_SOFTWARE;
 	dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
 	dev->hw_features |= NETIF_F_RXCSUM;
···
 	dev->type = ARPHRD_NONE;
 	netif_keep_dst(dev);
 	dev->priv_flags |= IFF_NO_QUEUE;
+	dev->lltx = true;
 	dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
 	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
 }

drivers/net/bonding/bond_main.c

···
 #endif /* CONFIG_XFRM_OFFLOAD */
 
 	/* don't acquire bond device's netif_tx_lock when transmitting */
-	bond_dev->features |= NETIF_F_LLTX;
+	bond_dev->lltx = true;
 
 	/* By default, we declare the bond to be fully
 	 * VLAN hardware accelerated capable. Special

drivers/net/dummy.c

···
 	dev->flags |= IFF_NOARP;
 	dev->flags &= ~IFF_MULTICAST;
 	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
+	dev->lltx = true;
 	dev->features	|= NETIF_F_SG | NETIF_F_FRAGLIST;
 	dev->features	|= NETIF_F_GSO_SOFTWARE;
-	dev->features	|= NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_LLTX;
+	dev->features	|= NETIF_F_HW_CSUM | NETIF_F_HIGHDMA;
 	dev->features	|= NETIF_F_GSO_ENCAP_ALL;
 	dev->hw_features |= dev->features;
 	dev->hw_enc_features |= dev->features;

drivers/net/ethernet/chelsio/cxgb/cxgb2.c

···
 		netdev->hw_features |= NETIF_F_SG | NETIF_F_IP_CSUM |
 			NETIF_F_RXCSUM;
 		netdev->features |= NETIF_F_SG | NETIF_F_IP_CSUM |
-			NETIF_F_RXCSUM | NETIF_F_LLTX | NETIF_F_HIGHDMA;
+			NETIF_F_RXCSUM | NETIF_F_HIGHDMA;
+		netdev->lltx = true;
 
 		if (vlan_tso_capable(adapter)) {
 			netdev->features |=

drivers/net/ethernet/freescale/dpaa/dpaa_eth.c

···
 	net_dev->max_mtu = dpaa_get_max_mtu();
 
 	net_dev->hw_features |= (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
-				 NETIF_F_LLTX | NETIF_F_RXHASH);
+				 NETIF_F_RXHASH);
 
 	net_dev->hw_features |= NETIF_F_SG | NETIF_F_HIGHDMA;
 	/* The kernels enables GSO automatically, if we declare NETIF_F_SG.
···
 	net_dev->features |= NETIF_F_RXCSUM;
 
 	net_dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+	net_dev->lltx = true;
 	/* we do not want shared skbs on TX */
 	net_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c

···
 
 	net_dev->priv_flags |= supported;
 	net_dev->priv_flags &= ~not_supported;
+	net_dev->lltx = true;
 
 	/* Features */
 	net_dev->features = NETIF_F_RXCSUM |
 			    NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 			    NETIF_F_SG | NETIF_F_HIGHDMA |
-			    NETIF_F_LLTX | NETIF_F_HW_TC | NETIF_F_TSO;
+			    NETIF_F_HW_TC | NETIF_F_TSO;
 	net_dev->gso_max_segs = DPAA2_ETH_ENQUEUE_MAX_FDS;
 	net_dev->hw_features = net_dev->features;
 	net_dev->xdp_features = NETDEV_XDP_ACT_BASIC |

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

···
 
 	netif_carrier_off(dev);
 
-	dev->features |= NETIF_F_NETNS_LOCAL | NETIF_F_LLTX | NETIF_F_SG |
+	dev->features |= NETIF_F_NETNS_LOCAL | NETIF_F_SG |
 			 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_TC;
 	dev->hw_features |= NETIF_F_HW_TC | NETIF_F_LOOPBACK;
+	dev->lltx = true;
 
 	dev->min_mtu = ETH_MIN_MTU;
 	dev->max_mtu = MLXSW_PORT_MAX_MTU - MLXSW_PORT_ETH_FRAME_HDR;

drivers/net/ethernet/netronome/nfp/nfp_net_repr.c

···
 
 	features = netdev_intersect_features(features, lower_features);
 	features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_HW_TC);
-	features |= NETIF_F_LLTX;
 
 	return features;
 }
···
 	netif_set_tso_max_segs(netdev, NFP_NET_LSO_MAX_SEGS);
 
 	netdev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL;
-	netdev->features |= NETIF_F_LLTX;
+	netdev->lltx = true;
 
 	if (nfp_app_has_tc(app)) {
 		netdev->features |= NETIF_F_HW_TC;

drivers/net/ethernet/pasemi/pasemi_mac.c

···
 
 	netif_napi_add(dev, &mac->napi, pasemi_mac_poll);
 
-	dev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX | NETIF_F_SG |
-			NETIF_F_HIGHDMA | NETIF_F_GSO;
+	dev->features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA |
+			NETIF_F_GSO;
+	dev->lltx = true;
 
 	mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
 	if (!mac->dma_pdev) {

drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c

···
 	rmnet_dev->needs_free_netdev = true;
 	rmnet_dev->ethtool_ops = &rmnet_ethtool_ops;
 
-	rmnet_dev->features |= NETIF_F_LLTX;
+	rmnet_dev->lltx = true;
 
 	/* This perm addr will be used as interface identifier by IPv6 */
 	rmnet_dev->addr_assign_type = NET_ADDR_RANDOM;

drivers/net/ethernet/sfc/ef100_rep.c

···
 	net_dev->ethtool_ops = &efx_ef100_rep_ethtool_ops;
 	net_dev->min_mtu = EFX_MIN_MTU;
 	net_dev->max_mtu = EFX_MAX_MTU;
-	net_dev->features |= NETIF_F_LLTX;
-	net_dev->hw_features |= NETIF_F_LLTX;
+	net_dev->lltx = true;
+
 	return efv;
 fail1:
 	free_netdev(net_dev);

drivers/net/ethernet/tehuti/tehuti.c

···
 
 #endif
 #ifdef BDX_LLTX
-	netif_trans_update(ndev); /* NETIF_F_LLTX driver :( */
+	netif_trans_update(ndev); /* dev->lltx driver :( */
 #endif
 	ndev->stats.tx_packets++;
 	ndev->stats.tx_bytes += skb->len;
···
 		 * set multicast list callback has to use priv->tx_lock.
 		 */
 #ifdef BDX_LLTX
-		ndev->features |= NETIF_F_LLTX;
+		ndev->lltx = true;
 #endif
 		/* MTU range: 60 - 16384 */
 		ndev->min_mtu = ETH_ZLEN;

drivers/net/ethernet/tehuti/tehuti.h

···
 	int tx_update_mark;
 	int tx_noupd;
 #endif
-	spinlock_t tx_lock;	/* NETIF_F_LLTX mode */
+	spinlock_t tx_lock;	/* dev->lltx mode */
 
 	/* rarely used */
 	u8 port;

drivers/net/ethernet/toshiba/spider_net.c

···
 	netdev->hw_features = NETIF_F_RXCSUM | NETIF_F_IP_CSUM;
 	if (SPIDER_NET_RX_CSUM_DEFAULT)
 		netdev->features |= NETIF_F_RXCSUM;
-	netdev->features |= NETIF_F_IP_CSUM | NETIF_F_LLTX;
+	netdev->features |= NETIF_F_IP_CSUM;
 	/* some time: NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
 	 *		NETIF_F_HW_VLAN_CTAG_FILTER
 	 */
+	netdev->lltx = true;
 
 	/* MTU range: 64 - 2294 */
 	netdev->min_mtu = SPIDER_NET_MIN_MTU;

drivers/net/geneve.c

···
 
 	SET_NETDEV_DEVTYPE(dev, &geneve_type);
 
-	dev->features    |= NETIF_F_LLTX;
 	dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
 	dev->features    |= NETIF_F_RXCSUM;
 	dev->features    |= NETIF_F_GSO_SOFTWARE;
···
 	netif_keep_dst(dev);
 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
+	dev->lltx = true;
 	eth_hw_addr_random(dev);
 }
 

drivers/net/gtp.c

···
 
 	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
 	dev->priv_flags	|= IFF_NO_QUEUE;
-	dev->features	|= NETIF_F_LLTX;
+	dev->lltx = true;
 	netif_keep_dst(dev);
 
 	dev->needed_headroom	= LL_MAX_HEADER + GTP_IPV4_MAXLEN;

drivers/net/hamradio/bpqether.c

···
 	dev->needs_free_netdev = true;
 
 	dev->flags      = 0;
-	dev->features	= NETIF_F_LLTX;	/* Allow recursion */
+	dev->lltx = true;	/* Allow recursion */
 
 #if IS_ENABLED(CONFIG_AX25)
 	dev->header_ops      = &ax25_header_ops;

drivers/net/ipvlan/ipvlan_main.c

···
 	 NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL)
 
 #define IPVLAN_ALWAYS_ON \
-	(IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED)
+	(IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_VLAN_CHALLENGED)
 
 #define IPVLAN_FEATURES \
 	(NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
···
 	dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES;
 	dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS;
 	dev->hw_enc_features |= dev->features;
+	dev->lltx = true;
 	netif_inherit_tso_max(dev, phy_dev);
 	dev->hard_header_len = phy_dev->hard_header_len;
 

drivers/net/loopback.c

···
 	dev->type		= ARPHRD_LOOPBACK;	/* 0x0001*/
 	dev->flags		= IFF_LOOPBACK;
 	dev->priv_flags		|= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
+	dev->lltx		= true;
 	netif_keep_dst(dev);
 	dev->hw_features	= NETIF_F_GSO_SOFTWARE;
 	dev->features		= NETIF_F_SG | NETIF_F_FRAGLIST
···
 		| NETIF_F_RXCSUM
 		| NETIF_F_SCTP_CRC
 		| NETIF_F_HIGHDMA
-		| NETIF_F_LLTX
 		| NETIF_F_NETNS_LOCAL
 		| NETIF_F_VLAN_CHALLENGED
 		| NETIF_F_LOOPBACK;

drivers/net/macsec.c

···
 		return err;
 
 	dev->features = real_dev->features & MACSEC_FEATURES;
-	dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
+	dev->features |= NETIF_F_GSO_SOFTWARE;
+	dev->lltx = true;
 	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
 
 	macsec_set_head_tail_room(dev);
···
 
 	features &= (real_dev->features & MACSEC_FEATURES) |
 		    NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
-	features |= NETIF_F_LLTX;
 
 	return features;
 }

drivers/net/macvlan.c

···
 	(NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
 	 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
 
-#define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
+#define ALWAYS_ON_FEATURES ALWAYS_ON_OFFLOADS
 
 #define MACVLAN_FEATURES \
 	(NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
···
 	dev->vlan_features	= lowerdev->vlan_features & MACVLAN_FEATURES;
 	dev->vlan_features	|= ALWAYS_ON_OFFLOADS;
 	dev->hw_enc_features    |= dev->features;
+	dev->lltx		= true;
 	netif_inherit_tso_max(dev, lowerdev);
 	dev->hard_header_len	= lowerdev->hard_header_len;
 	macvlan_set_lockdep_class(dev);

drivers/net/net_failover.c

···
 				       IFF_TX_SKB_SHARING);
 
 	/* don't acquire failover netdev's netif_tx_lock when transmitting */
-	failover_dev->features |= NETIF_F_LLTX;
+	failover_dev->lltx = true;
 
 	/* Don't allow failover devices to change network namespaces. */
 	failover_dev->features |= NETIF_F_NETNS_LOCAL;

drivers/net/netkit.c

···
 	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
 	dev->priv_flags |= IFF_PHONY_HEADROOM;
 	dev->priv_flags |= IFF_NO_QUEUE;
+	dev->lltx = true;
 
 	dev->ethtool_ops = &netkit_ethtool_ops;
 	dev->netdev_ops  = &netkit_netdev_ops;
 
-	dev->features |= netkit_features | NETIF_F_LLTX;
+	dev->features |= netkit_features;
 	dev->hw_features = netkit_features;
 	dev->hw_enc_features = netkit_features;
 	dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE;

drivers/net/nlmon.c

···
 {
 	dev->type = ARPHRD_NETLINK;
 	dev->priv_flags |= IFF_NO_QUEUE;
+	dev->lltx = true;
 
 	dev->netdev_ops	= &nlmon_ops;
 	dev->ethtool_ops = &nlmon_ethtool_ops;
 	dev->needs_free_netdev = true;
 
-	dev->features = NETIF_F_SG | NETIF_F_FRAGLIST |
-			NETIF_F_HIGHDMA | NETIF_F_LLTX;
+	dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
 	dev->flags = IFF_NOARP;
 	dev->pcpu_stat_type = NETDEV_PCPU_STAT_LSTATS;
 

drivers/net/ppp/ppp_generic.c

···
 	dev->netdev_ops = &ppp_netdev_ops;
 	SET_NETDEV_DEVTYPE(dev, &ppp_type);
 
-	dev->features |= NETIF_F_LLTX;
+	dev->lltx = true;
 
 	dev->hard_header_len = PPP_HDRLEN;
 	dev->mtu = PPP_MRU;

drivers/net/rionet.c

···
 	/* MTU range: 68 - 4082 */
 	ndev->min_mtu = ETH_MIN_MTU;
 	ndev->max_mtu = RIONET_MAX_MTU;
-	ndev->features = NETIF_F_LLTX;
+	ndev->lltx = true;
 	SET_NETDEV_DEV(ndev, &mport->dev);
 	ndev->ethtool_ops = &rionet_ethtool_ops;
 

drivers/net/team/team_core.c

···
 	 * Let this up to underlay drivers.
 	 */
 	dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
+	dev->lltx = true;
 
-	dev->features |= NETIF_F_LLTX;
 	dev->features |= NETIF_F_GRO;
 
 	/* Don't allow team devices to change network namespaces. */

drivers/net/tun.c

···
 	dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST |
 			   TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
 			   NETIF_F_HW_VLAN_STAG_TX;
-	dev->features = dev->hw_features | NETIF_F_LLTX;
+	dev->features = dev->hw_features;
 	dev->vlan_features = dev->features &
 			     ~(NETIF_F_HW_VLAN_CTAG_TX |
 			       NETIF_F_HW_VLAN_STAG_TX);
+	dev->lltx = true;
 
 	tun->flags = (tun->flags & ~TUN_FEATURES) |
 		      (ifr->ifr_flags & TUN_FEATURES);
···
 		goto drop;
 	}
 
-	/* NETIF_F_LLTX requires to do our own update of trans_start */
+	/* dev->lltx requires to do our own update of trans_start */
 	queue = netdev_get_tx_queue(dev, txq);
 	txq_trans_cond_update(queue);
 

drivers/net/veth.c

···
 	dev->priv_flags |= IFF_NO_QUEUE;
 	dev->priv_flags |= IFF_PHONY_HEADROOM;
 	dev->priv_flags |= IFF_DISABLE_NETPOLL;
+	dev->lltx = true;
 
 	dev->netdev_ops = &veth_netdev_ops;
 	dev->xdp_metadata_ops = &veth_xdp_metadata_ops;
 	dev->ethtool_ops = &veth_ethtool_ops;
-	dev->features |= NETIF_F_LLTX;
 	dev->features |= VETH_FEATURES;
 	dev->vlan_features = dev->features &
 			     ~(NETIF_F_HW_VLAN_CTAG_TX |

drivers/net/vrf.c

···
 	eth_hw_addr_random(dev);
 
 	/* don't acquire vrf device's netif_tx_lock when transmitting */
-	dev->features |= NETIF_F_LLTX;
+	dev->lltx = true;
 
 	/* don't allow vrf devices to change network namespaces. */
 	dev->features |= NETIF_F_NETNS_LOCAL;

drivers/net/vsockmon.c

···
 {
 	dev->type = ARPHRD_VSOCKMON;
 	dev->priv_flags |= IFF_NO_QUEUE;
+	dev->lltx = true;
 
 	dev->netdev_ops	= &vsockmon_ops;
 	dev->ethtool_ops = &vsockmon_ethtool_ops;
 	dev->needs_free_netdev = true;
 
-	dev->features = NETIF_F_SG | NETIF_F_FRAGLIST |
-			NETIF_F_HIGHDMA | NETIF_F_LLTX;
+	dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
 
 	dev->flags = IFF_NOARP;
 

drivers/net/vxlan/vxlan_core.c

···
 	dev->needs_free_netdev = true;
 	SET_NETDEV_DEVTYPE(dev, &vxlan_type);
 
-	dev->features	|= NETIF_F_LLTX;
 	dev->features	|= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
 	dev->features   |= NETIF_F_RXCSUM;
 	dev->features   |= NETIF_F_GSO_SOFTWARE;
···
 	netif_keep_dst(dev);
 	dev->priv_flags |= IFF_NO_QUEUE;
 	dev->change_proto_down = true;
+	dev->lltx = true;
 
 	/* MTU range: 68 - 65535 */
 	dev->min_mtu = ETH_MIN_MTU;

drivers/net/wireguard/device.c

···
 	dev->type = ARPHRD_NONE;
 	dev->flags = IFF_POINTOPOINT | IFF_NOARP;
 	dev->priv_flags |= IFF_NO_QUEUE;
-	dev->features |= NETIF_F_LLTX;
+	dev->lltx = true;
 	dev->features |= WG_NETDEV_FEATURES;
 	dev->hw_features |= WG_NETDEV_FEATURES;
 	dev->hw_enc_features |= WG_NETDEV_FEATURES;

drivers/staging/octeon/ethernet.c

···
 		dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
 
 	/* We do our own locking, Linux doesn't need to */
-	dev->features |= NETIF_F_LLTX;
+	dev->lltx = true;
 	dev->ethtool_ops = &cvm_oct_ethtool_ops;
 
 	cvm_oct_set_mac_filter(dev);

include/linux/netdev_features.h

···
 	NETIF_F_HW_VLAN_CTAG_FILTER_BIT,/* Receive filtering on VLAN CTAGs */
 	NETIF_F_VLAN_CHALLENGED_BIT,	/* Device cannot handle VLAN packets */
 	NETIF_F_GSO_BIT,		/* Enable software GSO. */
-	NETIF_F_LLTX_BIT,		/* LockLess TX - deprecated. Please */
-					/* do not use LLTX in new drivers */
+	__UNUSED_NETIF_F_12,
 	NETIF_F_NETNS_LOCAL_BIT,	/* Does not change network namespaces */
 	NETIF_F_GRO_BIT,		/* Generic receive offload */
 	NETIF_F_LRO_BIT,		/* large receive offload */
···
 #define NETIF_F_HW_VLAN_CTAG_TX	__NETIF_F(HW_VLAN_CTAG_TX)
 #define NETIF_F_IP_CSUM		__NETIF_F(IP_CSUM)
 #define NETIF_F_IPV6_CSUM	__NETIF_F(IPV6_CSUM)
-#define NETIF_F_LLTX		__NETIF_F(LLTX)
 #define NETIF_F_LOOPBACK	__NETIF_F(LOOPBACK)
 #define NETIF_F_LRO		__NETIF_F(LRO)
 #define NETIF_F_NETNS_LOCAL	__NETIF_F(NETNS_LOCAL)
···
 /* Features valid for ethtool to change */
 /* = all defined minus driver/device-class-related */
 #define NETIF_F_NEVER_CHANGE	(NETIF_F_VLAN_CHALLENGED | \
-				 NETIF_F_LLTX | NETIF_F_NETNS_LOCAL)
+				 NETIF_F_NETNS_LOCAL)
 
 /* remember that ((t)1 << t_BITS) is undefined in C99 */
 #define NETIF_F_ETHTOOL_BITS	((__NETIF_F_BIT(NETDEV_FEATURE_COUNT - 1) | \

include/linux/netdevice.h

···
  *
  *	@priv_flags:	flags invisible to userspace defined as bits, see
  *			enum netdev_priv_flags for the definitions
+ *	@lltx:		device supports lockless Tx. Deprecated for real HW
+ *			drivers. Mainly used by logical interfaces, such as
+ *			bonding and tunnels
  *
  *	@name:	This is the first field of the "visible" part of this structure
  *		(i.e. as seen by users in the "Space.c" file).  It is the name
···
 	__cacheline_group_begin(net_device_read_tx);
 	struct_group(priv_flags_fast,
 		unsigned long		priv_flags:32;
+		unsigned long		lltx:1;
 	);
 	const struct net_device_ops *netdev_ops;
 	const struct header_ops *header_ops;
···
 }
 
 #define HARD_TX_LOCK(dev, txq, cpu) {			\
-	if ((dev->features & NETIF_F_LLTX) == 0) {	\
+	if (!(dev)->lltx) {				\
 		__netif_tx_lock(txq, cpu);		\
 	} else {					\
 		__netif_tx_acquire(txq);		\
···
 }
 
 #define HARD_TX_TRYLOCK(dev, txq)			\
-	(((dev->features & NETIF_F_LLTX) == 0) ?	\
+	(!(dev)->lltx ?					\
 		__netif_tx_trylock(txq) :		\
 		__netif_tx_acquire(txq))
 
 #define HARD_TX_UNLOCK(dev, txq) {			\
-	if ((dev->features & NETIF_F_LLTX) == 0) {	\
+	if (!(dev)->lltx) {				\
 		__netif_tx_unlock(txq);			\
 	} else {					\
 		__netif_tx_release(txq);		\

lib/test_bpf.c

···
 		.build_skb = build_test_skb_linear_no_head_frag,
 		.features = NETIF_F_SG | NETIF_F_FRAGLIST |
 			    NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_GSO |
-			    NETIF_F_LLTX | NETIF_F_GRO |
-			    NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM |
+			    NETIF_F_GRO | NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM |
 			    NETIF_F_HW_VLAN_STAG_TX
 	}
 };

net/8021q/vlan_dev.c

···
 	if (real_dev->vlan_features & NETIF_F_HW_MACSEC)
 		dev->hw_features |= NETIF_F_HW_MACSEC;
 
-	dev->features |= dev->hw_features | NETIF_F_LLTX;
+	dev->features |= dev->hw_features;
+	dev->lltx = true;
 	netif_inherit_tso_max(dev, real_dev);
 	if (dev->features & NETIF_F_VLAN_FEATURES)
 		netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
···
 		lower_features |= NETIF_F_HW_CSUM;
 	features = netdev_intersect_features(features, lower_features);
 	features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
-	features |= NETIF_F_LLTX;
 
 	return features;
 }

net/batman-adv/soft-interface.c

···
 	dev->needs_free_netdev = true;
 	dev->priv_destructor = batadv_softif_free;
 	dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL;
-	dev->features |= NETIF_F_LLTX;
 	dev->priv_flags |= IFF_NO_QUEUE;
+	dev->lltx = true;
 
 	/* can't call min_mtu, because the needed variables
 	 * have not been initialized yet

net/bridge/br_device.c

···
 	dev->ethtool_ops = &br_ethtool_ops;
 	SET_NETDEV_DEVTYPE(dev, &br_type);
 	dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
+	dev->lltx = true;
 
-	dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
+	dev->features = COMMON_FEATURES | NETIF_F_NETNS_LOCAL |
 			NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
 	dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
 			   NETIF_F_HW_VLAN_STAG_TX;

net/core/net-sysfs.c

···
 
 static bool netdev_uses_bql(const struct net_device *dev)
 {
-	if (dev->features & NETIF_F_LLTX ||
-	    dev->priv_flags & IFF_NO_QUEUE)
+	if (dev->lltx || (dev->priv_flags & IFF_NO_QUEUE))
 		return false;
 
 	return IS_ENABLED(CONFIG_BQL);

net/dsa/user.c

···
 
 	user->features = conduit->vlan_features | NETIF_F_HW_TC;
 	user->hw_features |= NETIF_F_HW_TC;
-	user->features |= NETIF_F_LLTX;
 	if (user->needed_tailroom)
 		user->features &= ~(NETIF_F_SG | NETIF_F_FRAGLIST);
 	if (ds->needs_standalone_vlan_filtering)
 		user->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
+
+	user->lltx = true;
 }
 
 int dsa_user_suspend(struct net_device *user_dev)

net/ethtool/common.c

···
 	[NETIF_F_HW_VLAN_STAG_FILTER_BIT] = "rx-vlan-stag-filter",
 	[NETIF_F_VLAN_CHALLENGED_BIT] =  "vlan-challenged",
 	[NETIF_F_GSO_BIT] =              "tx-generic-segmentation",
-	[NETIF_F_LLTX_BIT] =             "tx-lockless",
 	[NETIF_F_NETNS_LOCAL_BIT] =      "netns-local",
 	[NETIF_F_GRO_BIT] =              "rx-gro",
 	[NETIF_F_GRO_HW_BIT] =           "rx-gro-hw",

net/hsr/hsr_device.c

···
 	dev->netdev_ops = &hsr_device_ops;
 	SET_NETDEV_DEVTYPE(dev, &hsr_type);
 	dev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL;
+	/* Prevent recursive tx locking */
+	dev->lltx = true;
 
 	dev->needs_free_netdev = true;
 
···
 
 	dev->features = dev->hw_features;
 
-	/* Prevent recursive tx locking */
-	dev->features |= NETIF_F_LLTX;
 	/* VLAN on top of HSR needs testing and probably some work on
 	 * hsr_header_create() etc.
 	 */

net/ipv4/ip_gre.c

···
 	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
 	dev->needed_headroom = tunnel->hlen + sizeof(tunnel->parms.iph);
 
-	dev->features		|= GRE_FEATURES | NETIF_F_LLTX;
+	dev->features		|= GRE_FEATURES;
 	dev->hw_features	|= GRE_FEATURES;
 
 	/* TCP offload with GRE SEQ is not supported, nor can we support 2
···
 
 	dev->features |= NETIF_F_GSO_SOFTWARE;
 	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+
+	dev->lltx = true;
 }
 
 static int ipgre_tunnel_init(struct net_device *dev)

net/ipv4/ip_vti.c

···
 
 	dev->flags		= IFF_NOARP;
 	dev->addr_len		= 4;
-	dev->features		|= NETIF_F_LLTX;
+	dev->lltx		= true;
 	netif_keep_dst(dev);
 
 	return ip_tunnel_init(dev);

net/ipv4/ipip.c

···
 	dev->type		= ARPHRD_TUNNEL;
 	dev->flags		= IFF_NOARP;
 	dev->addr_len		= 4;
-	dev->features		|= NETIF_F_LLTX;
+	dev->lltx		= true;
 	netif_keep_dst(dev);
 
 	dev->features		|= IPIP_FEATURES;

net/ipv6/ip6_gre.c

···
 {
 	struct ip6_tnl *nt = netdev_priv(dev);
 
-	dev->features		|= GRE6_FEATURES | NETIF_F_LLTX;
+	dev->features		|= GRE6_FEATURES;
 	dev->hw_features	|= GRE6_FEATURES;
 
 	/* TCP offload with GRE SEQ is not supported, nor can we support 2
···
 
 	dev->features |= NETIF_F_GSO_SOFTWARE;
 	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+
+	dev->lltx = true;
 }
 
 static int ip6gre_tunnel_init_common(struct net_device *dev)

net/ipv6/ip6_tunnel.c

···
 	dev->type = ARPHRD_TUNNEL6;
 	dev->flags |= IFF_NOARP;
 	dev->addr_len = sizeof(struct in6_addr);
-	dev->features |= NETIF_F_LLTX;
+	dev->lltx = true;
 	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
 	netif_keep_dst(dev);
 

net/ipv6/sit.c

···
 	dev->flags		= IFF_NOARP;
 	netif_keep_dst(dev);
 	dev->addr_len		= 4;
-	dev->features		|= NETIF_F_LLTX;
+	dev->lltx		= true;
 	dev->features		|= SIT_FEATURES;
 	dev->hw_features	|= SIT_FEATURES;
 	dev->pcpu_stat_type	= NETDEV_PCPU_STAT_TSTATS;

net/l2tp/l2tp_eth.c

···
 	SET_NETDEV_DEVTYPE(dev, &l2tpeth_type);
 	ether_setup(dev);
 	dev->priv_flags		&= ~IFF_TX_SKB_SHARING;
-	dev->features		|= NETIF_F_LLTX;
+	dev->lltx		= true;
 	dev->netdev_ops		= &l2tp_eth_netdev_ops;
 	dev->needs_free_netdev	= true;
 	dev->pcpu_stat_type	= NETDEV_PCPU_STAT_TSTATS;

net/openvswitch/vport-internal_dev.c

···
 	netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
 	netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
 			      IFF_NO_QUEUE;
+	netdev->lltx = true;
 	netdev->needs_free_netdev = true;
 	netdev->priv_destructor = NULL;
 	netdev->ethtool_ops = &internal_dev_ethtool_ops;
 	netdev->rtnl_link_ops = &internal_dev_link_ops;
 
-	netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
-			   NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
-			   NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
+	netdev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
+			   NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE |
+			   NETIF_F_GSO_ENCAP_ALL;
 
 	netdev->vlan_features = netdev->features;
 	netdev->hw_enc_features = netdev->features;
 	netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
-	netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
+	netdev->hw_features = netdev->features;
 
 	eth_hw_addr_random(netdev);
 }

net/xfrm/xfrm_interface_core.c

···
 	if (err)
 		return err;
 
-	dev->features |= NETIF_F_LLTX;
+	dev->lltx = true;
 	dev->features |= XFRMI_FEATURES;
 	dev->hw_features |= XFRMI_FEATURES;