net-device: move gso_partial_features to net_device_read_tx

dev->gso_partial_features is read from tx fast path for GSO packets.

Move it to appropriate section to avoid a cache line miss.

Fixes: 43a71cd ("net-device: reorganize net_device fast path variables")
Signed-off-by: Eric Dumazet <[email protected]>
Cc: Coco Li <[email protected]>
Cc: David Ahern <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: edumazet

Documentation/networking/net_cachelines/net_device.rst

@@ -38,7 +38,7 @@ netdev_features_t                   wanted_features
 netdev_features_t                   vlan_features                                                   
 netdev_features_t                   hw_enc_features         -                   -                   netif_skb_features
 netdev_features_t                   mpls_features                                                   
-netdev_features_t                   gso_partial_features                                            
+netdev_features_t                   gso_partial_features    read_mostly                             gso_features_check
 unsigned_int                        min_mtu                                                         
 unsigned_int                        max_mtu                                                         
 unsigned_short                      type                                                            

include/linux/netdevice.h

@@ -2115,6 +2115,7 @@ struct net_device {
 	const struct net_device_ops *netdev_ops;
 	const struct header_ops *header_ops;
 	struct netdev_queue	*_tx;
+	netdev_features_t	gso_partial_features;
 	unsigned int		real_num_tx_queues;
 	unsigned int		gso_max_size;
 	unsigned int		gso_ipv4_max_size;
@@ -2211,7 +2212,6 @@ struct net_device {
 	netdev_features_t	vlan_features;
 	netdev_features_t	hw_enc_features;
 	netdev_features_t	mpls_features;
-	netdev_features_t	gso_partial_features;
 
 	unsigned int		min_mtu;
 	unsigned int		max_mtu;

net/core/dev.c

@@ -11629,6 +11629,7 @@ static void __init net_dev_struct_check(void)
 	CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_size);
 	CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_ipv4_max_size);
 	CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_segs);
+	CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_partial_features);
 	CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, num_tc);
 	CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, mtu);
 	CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, needed_headroom);
@@ -11642,7 +11643,7 @@ static void __init net_dev_struct_check(void)
 #ifdef CONFIG_NET_XGRESS
 	CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, tcx_egress);
 #endif
-	CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_tx, 152);
+	CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_tx, 160);
 
 	/* TXRX read-mostly hotpath */
 	CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, flags);