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net: annotate accesses to dev->gso_max_size

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

Add the READ_ONCE()/WRITE_ONCE() pairs, and use netif_set_gso_max_size()
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 07:43:31 -08:00 committed by David S. Miller
parent 8e2a2f9051
commit 4b66d2161b
13 changed files with 18 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/netronome/nfp/nfp_net_repr.c
View File

@ -286,7 +286,7 @@ nfp_repr_transfer_features(struct net_device *netdev, struct net_device *lower)
if (repr->dst->u.port_info.lower_dev != lower)
return;
netdev->gso_max_size = lower->gso_max_size;
netif_set_gso_max_size(netdev, lower->gso_max_size);
netdev->gso_max_segs = lower->gso_max_segs;
netdev_update_features(netdev);

4
drivers/net/ethernet/realtek/r8169_main.c
View File

@ -5390,11 +5390,11 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
*/
if (rtl_chip_supports_csum_v2(tp)) {
dev->hw_features |= NETIF_F_SG | NETIF_F_TSO | NETIF_F_TSO6;
dev->gso_max_size = RTL_GSO_MAX_SIZE_V2;
netif_set_gso_max_size(dev, RTL_GSO_MAX_SIZE_V2);
dev->gso_max_segs = RTL_GSO_MAX_SEGS_V2;
} else {
dev->hw_features |= NETIF_F_SG | NETIF_F_TSO;
dev->gso_max_size = RTL_GSO_MAX_SIZE_V1;
netif_set_gso_max_size(dev, RTL_GSO_MAX_SIZE_V1);
dev->gso_max_segs = RTL_GSO_MAX_SEGS_V1;
}

2
drivers/net/ethernet/sfc/ef100_nic.c
View File

@ -993,7 +993,7 @@ static int ef100_process_design_param(struct efx_nic *efx,
return 0;
case ESE_EF100_DP_GZ_TSO_MAX_PAYLOAD_LEN:
nic_data->tso_max_payload_len = min_t(u64, reader->value, GSO_MAX_SIZE);
efx->net_dev->gso_max_size = nic_data->tso_max_payload_len;
netif_set_gso_max_size(efx->net_dev, nic_data->tso_max_payload_len);
return 0;
case ESE_EF100_DP_GZ_TSO_MAX_PAYLOAD_NUM_SEGS:
nic_data->tso_max_payload_num_segs = min_t(u64, reader->value, 0xffff);

4
drivers/net/ipvlan/ipvlan_main.c
View File

@ -140,7 +140,7 @@ static int ipvlan_init(struct net_device *dev)
dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES;
dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS;
dev->hw_enc_features |= dev->features;
dev->gso_max_size = phy_dev->gso_max_size;
netif_set_gso_max_size(dev, phy_dev->gso_max_size);
dev->gso_max_segs = phy_dev->gso_max_segs;
dev->hard_header_len = phy_dev->hard_header_len;
@ -763,7 +763,7 @@ static int ipvlan_device_event(struct notifier_block *unused,
case NETDEV_FEAT_CHANGE:
list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
ipvlan->dev->gso_max_size = dev->gso_max_size;
netif_set_gso_max_size(ipvlan->dev, dev->gso_max_size);
ipvlan->dev->gso_max_segs = dev->gso_max_segs;
netdev_update_features(ipvlan->dev);
}

4
drivers/net/macvlan.c
View File

@ -900,7 +900,7 @@ static int macvlan_init(struct net_device *dev)
dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
dev->vlan_features |= ALWAYS_ON_OFFLOADS;
dev->hw_enc_features |= dev->features;
dev->gso_max_size = lowerdev->gso_max_size;
netif_set_gso_max_size(dev, lowerdev->gso_max_size);
dev->gso_max_segs = lowerdev->gso_max_segs;
dev->hard_header_len = lowerdev->hard_header_len;
macvlan_set_lockdep_class(dev);
@ -1748,7 +1748,7 @@ static int macvlan_device_event(struct notifier_block *unused,
break;
case NETDEV_FEAT_CHANGE:
list_for_each_entry(vlan, &port->vlans, list) {
vlan->dev->gso_max_size = dev->gso_max_size;
netif_set_gso_max_size(vlan->dev, dev->gso_max_size);
vlan->dev->gso_max_segs = dev->gso_max_segs;
netdev_update_features(vlan->dev);
}

2
drivers/net/veth.c
View File

@ -1689,7 +1689,7 @@ static int veth_newlink(struct net *src_net, struct net_device *dev,
if (ifmp && (dev->ifindex != 0))
peer->ifindex = ifmp->ifi_index;
peer->gso_max_size = dev->gso_max_size;
netif_set_gso_max_size(peer, dev->gso_max_size);
peer->gso_max_segs = dev->gso_max_segs;
err = register_netdevice(peer);

2
drivers/net/vxlan.c
View File

@ -3811,7 +3811,7 @@ static void vxlan_config_apply(struct net_device *dev,
if (lowerdev) {
dst->remote_ifindex = conf->remote_ifindex;
dev->gso_max_size = lowerdev->gso_max_size;
netif_set_gso_max_size(dev, lowerdev->gso_max_size);
dev->gso_max_segs = lowerdev->gso_max_segs;
needed_headroom = lowerdev->hard_header_len;

3
include/linux/netdevice.h
View File

@ -4731,7 +4731,8 @@ static inline bool netif_needs_gso(struct sk_buff *skb,
static inline void netif_set_gso_max_size(struct net_device *dev,
unsigned int size)
{
dev->gso_max_size = size;
/* dev->gso_max_size is read locklessly from sk_setup_caps() */
WRITE_ONCE(dev->gso_max_size, size);
}
static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol,

2
net/8021q/vlan.c
View File

@ -322,7 +322,7 @@ static void vlan_transfer_features(struct net_device *dev,
{
struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
vlandev->gso_max_size = dev->gso_max_size;
netif_set_gso_max_size(vlandev, dev->gso_max_size);
vlandev->gso_max_segs = dev->gso_max_segs;
if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))

2
net/8021q/vlan_dev.c
View File

@ -573,7 +573,7 @@ static int vlan_dev_init(struct net_device *dev)
NETIF_F_ALL_FCOE;
dev->features |= dev->hw_features | NETIF_F_LLTX;
dev->gso_max_size = real_dev->gso_max_size;
netif_set_gso_max_size(dev, real_dev->gso_max_size);
dev->gso_max_segs = real_dev->gso_max_segs;
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");

2
net/bridge/br_if.c
View File

@ -525,7 +525,7 @@ static void br_set_gso_limits(struct net_bridge *br)
gso_max_size = min(gso_max_size, p->dev->gso_max_size);
gso_max_segs = min(gso_max_segs, p->dev->gso_max_segs);
}
br->dev->gso_max_size = gso_max_size;
netif_set_gso_max_size(br->dev, gso_max_size);
br->dev->gso_max_segs = gso_max_segs;
}

3
net/core/sock.c
View File

@ -2257,7 +2257,8 @@ void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
} else {
sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
sk->sk_gso_max_size = dst->dev->gso_max_size;
/* pairs with the WRITE_ONCE() in netif_set_gso_max_size() */
sk->sk_gso_max_size = READ_ONCE(dst->dev->gso_max_size);
max_segs = max_t(u32, dst->dev->gso_max_segs, 1);
}
}

2
net/sctp/output.c
View File

@ -134,7 +134,7 @@ void sctp_packet_config(struct sctp_packet *packet, __u32 vtag,
dst_hold(tp->dst);
sk_setup_caps(sk, tp->dst);
}
packet->max_size = sk_can_gso(sk) ? tp->dst->dev->gso_max_size
packet->max_size = sk_can_gso(sk) ? READ_ONCE(tp->dst->dev->gso_max_size)
: asoc->pathmtu;
rcu_read_unlock();
}