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net: annotate accesses to dev->gso_max_segs

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dev->gso_max_segs is written under RTNL protection, or when the device is
not yet visible, but is read locklessly.

Add netif_set_gso_max_segs() helper.

Add the READ_ONCE()/WRITE_ONCE() pairs, and use netif_set_gso_max_segs()
where we can to better document what is going on.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2021-11-19 07:43:32 -08:00
committed by David S. Miller
parent 4b66d2161b
commit 6d872df3e3
24 changed files with 37 additions and 29 deletions
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drivers/net/ipvlan/ipvlan_main.c
+2 -2
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@@ -141,7 +141,7 @@ static int ipvlan_init(struct net_device *dev)
dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS;
dev->hw_enc_features |= dev->features;
netif_set_gso_max_size(dev, phy_dev->gso_max_size);
dev->gso_max_segs = phy_dev->gso_max_segs;
netif_set_gso_max_segs(dev, phy_dev->gso_max_segs);
dev->hard_header_len = phy_dev->hard_header_len;
netdev_lockdep_set_classes(dev);
@@ -764,7 +764,7 @@ static int ipvlan_device_event(struct notifier_block *unused,
case NETDEV_FEAT_CHANGE:
list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
netif_set_gso_max_size(ipvlan->dev, dev->gso_max_size);
ipvlan->dev->gso_max_segs = dev->gso_max_segs;
netif_set_gso_max_segs(ipvlan->dev, dev->gso_max_segs);
netdev_update_features(ipvlan->dev);
}
break;