net: Allow netdevices to specify needed head/tailroom

This patch adds needed_headroom/needed_tailroom members to struct
net_device and updates many places that allocate sbks to use them. Not
all of them can be converted though, and I'm sure I missed some (I
mostly grepped for LL_RESERVED_SPACE)

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 6 deletions

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 11d7f753a82..fead049daf4 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -322,7 +322,6 @@ static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
                         unsigned int flags)
 {
         struct inet_sock *inet = inet_sk(sk);
-        int hh_len;
         struct iphdr *iph;
         struct sk_buff *skb;
         unsigned int iphlen;
@@ -336,13 +335,12 @@ static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
         if (flags&MSG_PROBE)
                 goto out;
 
-        hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
-
-        skb = sock_alloc_send_skb(sk, length+hh_len+15,
-                                  flags&MSG_DONTWAIT, &err);
+        skb = sock_alloc_send_skb(sk,
+                                  length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15,
+                                  flags & MSG_DONTWAIT, &err);
         if (skb == NULL)
                 goto error;
-        skb_reserve(skb, hh_len);
+        skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev));
 
         skb->priority = sk->sk_priority;
         skb->mark = sk->sk_mark;