[PATCH net-next] net: remove netdevice gso_min_segs

[Eric Dumazet]

From: Eric Dumazet <eduma...@google.com>

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 <eduma...@google.com>
---
 include/linux/netdevice.h |    4 +---
 net/core/dev.c            |    3 +--
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index cb4e508b3f38..dd3391aafa7d 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -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
diff --git a/net/core/dev.c b/net/core/dev.c
index 273f10d1e306..b75dfdb37422 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -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
@@ -7428,7 +7428,6 @@ 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);