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>

4 files changed, 9 insertions, 11 deletions

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 0af2e055f883..48cdce9c696c 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -780,7 +780,7 @@ slow_path:
                  *      Allocate buffer.
                  */
 
-                if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_RESERVED_SPACE(rt->u.dst.dev), GFP_ATOMIC)) == NULL) {
+                if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_ALLOCATED_SPACE(rt->u.dst.dev), GFP_ATOMIC)) == NULL) {
                         NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n");
                         IP6_INC_STATS(ip6_dst_idev(skb->dst),
                                       IPSTATS_MIB_FRAGFAILS);
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 54f91efdae58..fd632dd7f98d 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -1411,7 +1411,7 @@ static struct sk_buff *mld_newpack(struct net_device *dev, int size)
                      IPV6_TLV_PADN, 0 };
 
         /* we assume size > sizeof(ra) here */
-        skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
+        skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err);
 
         if (!skb)
                 return NULL;
@@ -1790,7 +1790,7 @@ static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
         payload_len = len + sizeof(ra);
         full_len = sizeof(struct ipv6hdr) + payload_len;
 
-        skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
+        skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
 
         if (skb == NULL) {
                 rcu_read_lock();
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 2c74885f8355..a55fc05b8125 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -479,7 +479,7 @@ static void __ndisc_send(struct net_device *dev,
 
         skb = sock_alloc_send_skb(sk,
                                   (MAX_HEADER + sizeof(struct ipv6hdr) +
-                                   len + LL_RESERVED_SPACE(dev)),
+                                   len + LL_ALLOCATED_SPACE(dev)),
                                   1, &err);
         if (!skb) {
                 ND_PRINTK0(KERN_ERR
@@ -1521,7 +1521,7 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
 
         buff = sock_alloc_send_skb(sk,
                                    (MAX_HEADER + sizeof(struct ipv6hdr) +
-                                    len + LL_RESERVED_SPACE(dev)),
+                                    len + LL_ALLOCATED_SPACE(dev)),
                                    1, &err);
         if (buff == NULL) {
                 ND_PRINTK0(KERN_ERR
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 396f0ea11090..232e0dc45bf5 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -609,7 +609,6 @@ static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
         struct ipv6_pinfo *np = inet6_sk(sk);
         struct ipv6hdr *iph;
         struct sk_buff *skb;
-        unsigned int hh_len;
         int err;
 
         if (length > rt->u.dst.dev->mtu) {
@@ -619,13 +618,12 @@ static int rawv6_send_hdrinc(struct sock *sk, void *from, int 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;