skbuff: skb_segment: s/skb/head_skb/

rename local variable to make it easier to tell at a glance that we are
dealing with a head skb.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index d788a98..fdc065d 100644 (file)
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -2838,41 +2838,42 @@ EXPORT_SYMBOL_GPL(skb_pull_rcsum);
 
 /**
  *     skb_segment - Perform protocol segmentation on skb.
- *     @skb: buffer to segment
+ *     @head_skb: buffer to segment
  *     @features: features for the output path (see dev->features)
  *
  *     This function performs segmentation on the given skb.  It returns
  *     a pointer to the first in a list of new skbs for the segments.
  *     In case of error it returns ERR_PTR(err).
  */
-struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features)
+struct sk_buff *skb_segment(struct sk_buff *head_skb,
+                           netdev_features_t features)
 {
        struct sk_buff *segs = NULL;
        struct sk_buff *tail = NULL;
-       struct sk_buff *fskb = skb_shinfo(skb)->frag_list;
-       skb_frag_t *frag = skb_shinfo(skb)->frags;
-       unsigned int mss = skb_shinfo(skb)->gso_size;
-       unsigned int doffset = skb->data - skb_mac_header(skb);
+       struct sk_buff *fskb = skb_shinfo(head_skb)->frag_list;
+       skb_frag_t *frag = skb_shinfo(head_skb)->frags;
+       unsigned int mss = skb_shinfo(head_skb)->gso_size;
+       unsigned int doffset = head_skb->data - skb_mac_header(head_skb);
        unsigned int offset = doffset;
-       unsigned int tnl_hlen = skb_tnl_header_len(skb);
+       unsigned int tnl_hlen = skb_tnl_header_len(head_skb);
        unsigned int headroom;
        unsigned int len;
        __be16 proto;
        bool csum;
        int sg = !!(features & NETIF_F_SG);
-       int nfrags = skb_shinfo(skb)->nr_frags;
+       int nfrags = skb_shinfo(head_skb)->nr_frags;
        int err = -ENOMEM;
        int i = 0;
        int pos;
 
-       proto = skb_network_protocol(skb);
+       proto = skb_network_protocol(head_skb);
        if (unlikely(!proto))
                return ERR_PTR(-EINVAL);
 
        csum = !!can_checksum_protocol(features, proto);
-       __skb_push(skb, doffset);
-       headroom = skb_headroom(skb);
-       pos = skb_headlen(skb);
+       __skb_push(head_skb, doffset);
+       headroom = skb_headroom(head_skb);
+       pos = skb_headlen(head_skb);
 
        do {
                struct sk_buff *nskb;
@@ -2880,11 +2881,11 @@ struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features)
                int hsize;
                int size;
 
-               len = skb->len - offset;
+               len = head_skb->len - offset;
                if (len > mss)
                        len = mss;
 
-               hsize = skb_headlen(skb) - offset;
+               hsize = skb_headlen(head_skb) - offset;
                if (hsize < 0)
                        hsize = 0;
                if (hsize > len || !sg)
@@ -2933,7 +2934,7 @@ struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features)
                        __skb_push(nskb, doffset);
                } else {
                        nskb = __alloc_skb(hsize + doffset + headroom,
-                                          GFP_ATOMIC, skb_alloc_rx_flag(skb),
+                                          GFP_ATOMIC, skb_alloc_rx_flag(head_skb),
                                           NUMA_NO_NODE);
 
                        if (unlikely(!nskb))
@@ -2949,12 +2950,12 @@ struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features)
                        segs = nskb;
                tail = nskb;
 
-               __copy_skb_header(nskb, skb);
-               nskb->mac_len = skb->mac_len;
+               __copy_skb_header(nskb, head_skb);
+               nskb->mac_len = head_skb->mac_len;
 
                skb_headers_offset_update(nskb, skb_headroom(nskb) - headroom);
 
-               skb_copy_from_linear_data_offset(skb, -tnl_hlen,
+               skb_copy_from_linear_data_offset(head_skb, -tnl_hlen,
                                                 nskb->data - tnl_hlen,
                                                 doffset + tnl_hlen);
 
@@ -2963,7 +2964,7 @@ struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features)
 
                if (!sg) {
                        nskb->ip_summed = CHECKSUM_NONE;
-                       nskb->csum = skb_copy_and_csum_bits(skb, offset,
+                       nskb->csum = skb_copy_and_csum_bits(head_skb, offset,
                                                            skb_put(nskb, len),
                                                            len, 0);
                        continue;
@@ -2971,10 +2972,11 @@ struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features)
 
                nskb_frag = skb_shinfo(nskb)->frags;
 
-               skb_copy_from_linear_data_offset(skb, offset,
+               skb_copy_from_linear_data_offset(head_skb, offset,
                                                 skb_put(nskb, hsize), hsize);
 
-               skb_shinfo(nskb)->tx_flags = skb_shinfo(skb)->tx_flags & SKBTX_SHARED_FRAG;
+               skb_shinfo(nskb)->tx_flags = skb_shinfo(head_skb)->tx_flags &
+                       SKBTX_SHARED_FRAG;
 
                while (pos < offset + len) {
                        if (i >= nfrags) {
@@ -3031,7 +3033,7 @@ perform_csum_check:
                                                  nskb->len - doffset, 0);
                        nskb->ip_summed = CHECKSUM_NONE;
                }
-       } while ((offset += len) < skb->len);
+       } while ((offset += len) < head_skb->len);
 
        return segs;