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net: remove netdevice gso_min_segs 

After introduction of ndo_features_check(), we believe that very
specific checks for rare features should not be done in core
networking stack.

No driver uses gso_min_segs yet, so we revert this feature and save
few instructions per tx packet in fast path.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-04-09 11:29:58 -07:00 committed by David S. Miller
parent cfe2f14c72
commit 743b03a832
2 changed files with 2 additions and 5 deletions
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4
include/linux/netdevice.h
View File

@ -1586,8 +1586,6 @@ enum netdev_priv_flags {
* @gso_max_size: Maximum size of generic segmentation offload
* @gso_max_segs: Maximum number of segments that can be passed to the
* NIC for GSO
* @gso_min_segs: Minimum number of segments that can be passed to the
* NIC for GSO
*
* @dcbnl_ops: Data Center Bridging netlink ops
* @num_tc: Number of traffic classes in the net device
@ -1858,7 +1856,7 @@ struct net_device {
unsigned int gso_max_size;
#define GSO_MAX_SEGS 65535
u16 gso_max_segs;
u16 gso_min_segs;
#ifdef CONFIG_DCB
const struct dcbnl_rtnl_ops *dcbnl_ops;
#endif

3
net/core/dev.c
View File

@ -2831,7 +2831,7 @@ netdev_features_t netif_skb_features(struct sk_buff *skb)
netdev_features_t features = dev->features;
u16 gso_segs = skb_shinfo(skb)->gso_segs;
if (gso_segs > dev->gso_max_segs || gso_segs < dev->gso_min_segs)
if (gso_segs > dev->gso_max_segs)
features &= ~NETIF_F_GSO_MASK;
/* If encapsulation offload request, verify we are testing
@ -7429,7 +7429,6 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
dev->gso_max_size = GSO_MAX_SIZE;
dev->gso_max_segs = GSO_MAX_SEGS;
dev->gso_min_segs = 0;
INIT_LIST_HEAD(&dev->napi_list);
INIT_LIST_HEAD(&dev->unreg_list);