[PATCH 3.8 13/86] net: core: introduce netif_skb_dev_features

From: Kamal Mostafa
Date: Tue Apr 01 2014 - 12:39:18 EST


3.8.13.21 -stable review patch. If anyone has any objections, please let me know.

------------------

From: Florian Westphal <fw@xxxxxxxxx>

commit d206940319c41df4299db75ed56142177bb2e5f6 upstream.

Will be used by upcoming ipv4 forward path change that needs to
determine feature mask using skb->dst->dev instead of skb->dev.

Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
[ kamal: backport to 3.8 (context) ]
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
include/linux/netdevice.h | 7 ++++++-
net/core/dev.c | 27 ++++++++++++++++-----------
2 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 0cabad8..48b1504 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2679,7 +2679,12 @@ void netdev_change_features(struct net_device *dev);
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
struct net_device *dev);

-netdev_features_t netif_skb_features(struct sk_buff *skb);
+netdev_features_t netif_skb_dev_features(struct sk_buff *skb,
+ const struct net_device *dev);
+static inline netdev_features_t netif_skb_features(struct sk_buff *skb)
+{
+ return netif_skb_dev_features(skb, skb->dev);
+}

static inline bool net_gso_ok(netdev_features_t features, int gso_type)
{
diff --git a/net/core/dev.c b/net/core/dev.c
index 4fe7689..59a5ce7 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2153,7 +2153,7 @@ EXPORT_SYMBOL(netdev_rx_csum_fault);
* 2. No high memory really exists on this machine.
*/

-static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
+static int illegal_highdma(const struct net_device *dev, struct sk_buff *skb)
{
#ifdef CONFIG_HIGHMEM
int i;
@@ -2244,45 +2244,50 @@ static bool can_checksum_protocol(netdev_features_t features, __be16 protocol)
}

static netdev_features_t harmonize_features(struct sk_buff *skb,
- __be16 protocol, netdev_features_t features)
+ __be16 protocol,
+ const struct net_device *dev,
+ netdev_features_t features)
{
if (skb->ip_summed != CHECKSUM_NONE &&
!can_checksum_protocol(features, protocol)) {
features &= ~NETIF_F_ALL_CSUM;
features &= ~NETIF_F_SG;
- } else if (illegal_highdma(skb->dev, skb)) {
+ } else if (illegal_highdma(dev, skb)) {
features &= ~NETIF_F_SG;
}

return features;
}

-netdev_features_t netif_skb_features(struct sk_buff *skb)
+netdev_features_t netif_skb_dev_features(struct sk_buff *skb,
+ const struct net_device *dev)
{
__be16 protocol = skb->protocol;
- netdev_features_t features = skb->dev->features;
+ netdev_features_t features = dev->features;

- if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs)
+ if (skb_shinfo(skb)->gso_segs > dev->gso_max_segs)
features &= ~NETIF_F_GSO_MASK;

if (protocol == htons(ETH_P_8021Q)) {
struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
protocol = veh->h_vlan_encapsulated_proto;
} else if (!vlan_tx_tag_present(skb)) {
- return harmonize_features(skb, protocol, features);
+ return harmonize_features(skb, protocol, dev, features);
}

- features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
+ features &= (dev->vlan_features | NETIF_F_HW_VLAN_TX);

if (protocol != htons(ETH_P_8021Q)) {
- return harmonize_features(skb, protocol, features);
+ return harmonize_features(skb, protocol, dev, features);
} else {
features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
- return harmonize_features(skb, protocol, features);
+ return harmonize_features(skb, protocol, dev, features);
}
+
+ return harmonize_features(skb, protocol, dev, features);
}
-EXPORT_SYMBOL(netif_skb_features);
+EXPORT_SYMBOL(netif_skb_dev_features);

/*
* Returns true if either:
--
1.8.3.2

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