net: annotate accesses to dev->gso_max_segs
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>
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 2af8aee..fd030e0 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2768,7 +2768,7 @@ static int do_setlink(const struct sk_buff *skb,
}
if (dev->gso_max_segs ^ max_segs) {
- dev->gso_max_segs = max_segs;
+ netif_set_gso_max_segs(dev, max_segs);
status |= DO_SETLINK_MODIFIED;
}
}
@@ -3222,7 +3222,7 @@ struct net_device *rtnl_create_link(struct net *net, const char *ifname,
if (tb[IFLA_GSO_MAX_SIZE])
netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
if (tb[IFLA_GSO_MAX_SEGS])
- dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
+ netif_set_gso_max_segs(dev, nla_get_u32(tb[IFLA_GSO_MAX_SEGS]));
return dev;
}
