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sch_cake: don't try to reallocate or unshare skb unconditionally

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cake_handle_diffserv() tries to linearize mac and network header parts of
skb and to make it writable unconditionally. In some cases it leads to full
skb reallocation, which reduces throughput and increases CPU load. Some
measurements of IPv4 forward + NAPT on MIPS router with 580 MHz single-core
CPU was conducted. It appears that on kernel 4.9 skb_try_make_writable()
reallocates skb, if skb was allocated in ethernet driver via so-called
'build skb' method from page cache (it was discovered by strange increase
of kmalloc-2048 slab at first).

Obtain DSCP value via read-only skb_header_pointer() call, and leave
linearization only for DSCP bleaching or ECN CE setting. And, as an
additional optimisation, skip diffserv parsing entirely if it is not needed
by the current configuration.

Fixes: c87b4ecdbe ("sch_cake: Make sure we can write the IP header before changing DSCP bits")
Signed-off-by: Ilya Ponetayev <i.ponetaev@ndmsystems.com>
[ fix a few style issues, reflow commit message ]
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilya Ponetayev 2020-06-25 22:12:07 +02:00 committed by David S. Miller
parent 1ae71d997a
commit 9208d2863a
1 changed files with 30 additions and 11 deletions
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41
net/sched/sch_cake.c
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@ -1553,30 +1553,49 @@ static unsigned int cake_drop(struct Qdisc *sch, struct sk_buff **to_free)
static u8 cake_handle_diffserv(struct sk_buff *skb, u16 wash)
{
int wlen = skb_network_offset(skb);
const int offset = skb_network_offset(skb);
u16 *buf, buf_;
u8 dscp;
switch (tc_skb_protocol(skb)) {
case htons(ETH_P_IP):
wlen += sizeof(struct iphdr);
if (!pskb_may_pull(skb, wlen) ||
skb_try_make_writable(skb, wlen))
buf = skb_header_pointer(skb, offset, sizeof(buf_), &buf_);
if (unlikely(!buf))
return 0;
dscp = ipv4_get_dsfield(ip_hdr(skb)) >> 2;
if (wash && dscp)
/* ToS is in the second byte of iphdr */
dscp = ipv4_get_dsfield((struct iphdr *)buf) >> 2;
if (wash && dscp) {
const int wlen = offset + sizeof(struct iphdr);
if (!pskb_may_pull(skb, wlen) ||
skb_try_make_writable(skb, wlen))
return 0;
ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, 0);
}
return dscp;
case htons(ETH_P_IPV6):
wlen += sizeof(struct ipv6hdr);
if (!pskb_may_pull(skb, wlen) ||
skb_try_make_writable(skb, wlen))
buf = skb_header_pointer(skb, offset, sizeof(buf_), &buf_);
if (unlikely(!buf))
return 0;
dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2;
if (wash && dscp)
/* Traffic class is in the first and second bytes of ipv6hdr */
dscp = ipv6_get_dsfield((struct ipv6hdr *)buf) >> 2;
if (wash && dscp) {
const int wlen = offset + sizeof(struct ipv6hdr);
if (!pskb_may_pull(skb, wlen) ||
skb_try_make_writable(skb, wlen))
return 0;
ipv6_change_dsfield(ipv6_hdr(skb), INET_ECN_MASK, 0);
}
return dscp;
case htons(ETH_P_ARP):