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net: add and use skb_gso_transport_seglen()

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This moves part of Eric Dumazets skb_gso_seglen helper from tbf sched to
skbuff core so it may be reused by upcoming ip forwarding path patch.

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2014-01-26 10:58:16 +01:00 committed by David S. Miller
parent 77d143de75
commit de960aa9ab
3 changed files with 29 additions and 10 deletions
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1
include/linux/skbuff.h
View File

@ -2456,6 +2456,7 @@ void skb_zerocopy(struct sk_buff *to, const struct sk_buff *from,
void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len);
int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen);
void skb_scrub_packet(struct sk_buff *skb, bool xnet);
unsigned int skb_gso_transport_seglen(const struct sk_buff *skb);
struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features);
struct skb_checksum_ops {

25
net/core/skbuff.c
View File

@ -47,6 +47,8 @@
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/slab.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/netdevice.h>
#ifdef CONFIG_NET_CLS_ACT
#include <net/pkt_sched.h>
@ -3916,3 +3918,26 @@ void skb_scrub_packet(struct sk_buff *skb, bool xnet)
nf_reset_trace(skb);
}
EXPORT_SYMBOL_GPL(skb_scrub_packet);
/**
* skb_gso_transport_seglen - Return length of individual segments of a gso packet
*
* @skb: GSO skb
*
* skb_gso_transport_seglen is used to determine the real size of the
* individual segments, including Layer4 headers (TCP/UDP).
*
* The MAC/L2 or network (IP, IPv6) headers are not accounted for.
*/
unsigned int skb_gso_transport_seglen(const struct sk_buff *skb)
{
const struct skb_shared_info *shinfo = skb_shinfo(skb);
unsigned int hdr_len;
if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
hdr_len = tcp_hdrlen(skb);
else
hdr_len = sizeof(struct udphdr);
return hdr_len + shinfo->gso_size;
}
EXPORT_SYMBOL_GPL(skb_gso_transport_seglen);

13
net/sched/sch_tbf.c
View File

@ -21,7 +21,6 @@
#include <net/netlink.h>
#include <net/sch_generic.h>
#include <net/pkt_sched.h>
#include <net/tcp.h>
/* Simple Token Bucket Filter.
@ -148,16 +147,10 @@ static u64 psched_ns_t2l(const struct psched_ratecfg *r,
* Return length of individual segments of a gso packet,
* including all headers (MAC, IP, TCP/UDP)
*/
static unsigned int skb_gso_seglen(const struct sk_buff *skb)
static unsigned int skb_gso_mac_seglen(const struct sk_buff *skb)
{
unsigned int hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
const struct skb_shared_info *shinfo = skb_shinfo(skb);
if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
hdr_len += tcp_hdrlen(skb);
else
hdr_len += sizeof(struct udphdr);
return hdr_len + shinfo->gso_size;
return hdr_len + skb_gso_transport_seglen(skb);
}
/* GSO packet is too big, segment it so that tbf can transmit
@ -202,7 +195,7 @@ static int tbf_enqueue(struct sk_buff *skb, struct Qdisc *sch)
int ret;
if (qdisc_pkt_len(skb) > q->max_size) {
if (skb_is_gso(skb) && skb_gso_seglen(skb) <= q->max_size)
if (skb_is_gso(skb) && skb_gso_mac_seglen(skb) <= q->max_size)
return tbf_segment(skb, sch);
return qdisc_reshape_fail(skb, sch);
}