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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>
This commit is contained in:
Johannes Berg 2008-05-12 20:48:31 -07:00 committed by David S. Miller
parent 8388e3da34
commit f5184d267c
13 changed files with 39 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
include/linux/netdevice.h
View File

@ -246,11 +246,16 @@ struct hh_cache
*
* We could use other alignment values, but we must maintain the
* relationship HH alignment <= LL alignment.
*
* LL_ALLOCATED_SPACE also takes into account the tailroom the device
* may need.
*/
#define LL_RESERVED_SPACE(dev) \
(((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
#define LL_RESERVED_SPACE_EXTRA(dev,extra) \
((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
#define LL_ALLOCATED_SPACE(dev) \
((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
struct header_ops {
int (*create) (struct sk_buff *skb, struct net_device *dev,
@ -569,6 +574,13 @@ struct net_device
unsigned short type; /* interface hardware type */
unsigned short hard_header_len; /* hardware hdr length */
/* extra head- and tailroom the hardware may need, but not in all cases
* can this be guaranteed, especially tailroom. Some cases also use
* LL_MAX_HEADER instead to allocate the skb.
*/
unsigned short needed_headroom;
unsigned short needed_tailroom;
struct net_device *master; /* Pointer to master device of a group,
* which this device is member of.
*/

2
net/core/netpoll.c
View File

@ -419,7 +419,7 @@ static void arp_reply(struct sk_buff *skb)
return;
size = arp_hdr_len(skb->dev);
send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev),
send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev),
LL_RESERVED_SPACE(np->dev));
if (!send_skb)

2
net/econet/af_econet.c
View File

@ -340,7 +340,7 @@ static int econet_sendmsg(struct kiocb *iocb, struct socket *sock,
dev_hold(dev);
skb = sock_alloc_send_skb(sk, len+LL_RESERVED_SPACE(dev),
skb = sock_alloc_send_skb(sk, len+LL_ALLOCATED_SPACE(dev),
msg->msg_flags & MSG_DONTWAIT, &err);
if (skb==NULL)
goto out_unlock;

2
net/ipv4/arp.c
View File

@ -570,7 +570,7 @@ struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
* Allocate a buffer
*/
skb = alloc_skb(arp_hdr_len(dev) + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
skb = alloc_skb(arp_hdr_len(dev) + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
if (skb == NULL)
return NULL;

4
net/ipv4/igmp.c
View File

@ -292,7 +292,7 @@ static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
struct iphdr *pip;
struct igmpv3_report *pig;
skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
if (skb == NULL)
return NULL;
@ -653,7 +653,7 @@ static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
return -1;
}
skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
skb=alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
if (skb == NULL) {
ip_rt_put(rt);
return -1;

6
net/ipv4/ipconfig.c
View File

@ -710,14 +710,14 @@ static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_d
struct net_device *dev = d->dev;
struct sk_buff *skb;
struct bootp_pkt *b;
int hh_len = LL_RESERVED_SPACE(dev);
struct iphdr *h;
/* Allocate packet */
skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
GFP_KERNEL);
if (!skb)
return;
skb_reserve(skb, hh_len);
skb_reserve(skb, LL_RESERVED_SPACE(dev));
b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
memset(b, 0, sizeof(struct bootp_pkt));

10
net/ipv4/raw.c
View File

@ -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;

2
net/ipv6/ip6_output.c
View File

@ -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);

4
net/ipv6/mcast.c
View File

@ -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();

4
net/ipv6/ndisc.c
View File

@ -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

10
net/ipv6/raw.c
View File

@ -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;

2
net/packet/af_packet.c
View File

@ -743,7 +743,7 @@ static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
if (len > dev->mtu+reserve)
goto out_unlock;
skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev),
skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev),
msg->msg_flags & MSG_DONTWAIT, &err);
if (skb==NULL)
goto out_unlock;

6
net/xfrm/xfrm_output.c
View File

@ -25,11 +25,11 @@ static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb)
struct dst_entry *dst = skb->dst;
int nhead = dst->header_len + LL_RESERVED_SPACE(dst->dev)
- skb_headroom(skb);
int ntail = dst->dev->needed_tailroom - skb_tailroom(skb);
if (nhead > 0)
return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
if (nhead > 0 || ntail > 0)
return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC);
/* Check tail too... */
return 0;
}