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9208d2863a
linux/net
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Ilya Ponetayev 9208d2863a sch_cake: don't try to reallocate or unshare skb unconditionally 
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>
2020-06-25 16:24:05 -07:00
..
6lowpan treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
9p net: Add MODULE_DESCRIPTION entries to network modules 2020-06-20 21:33:57 -07:00
802 net: 802: psnap.c: Use built-in RCU list checking 2020-02-24 13:02:53 -08:00
8021q Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-06-13 16:27:13 -07:00
appletalk ipv4,appletalk: move SIOCADDRT and SIOCDELRT handling into ->compat_ioctl 2020-05-18 17:35:02 -07:00
atm Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-06-13 16:27:13 -07:00
ax25 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-24 13:47:27 -07:00
batman-adv net: change addr_list_lock back to static key 2020-06-09 12:59:45 -07:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-06-03 16:27:18 -07:00
bpf bpf: Fix too large copy from user in bpf_test_init 2020-05-19 17:56:34 +02:00
bpfilter bpfilter: document build requirements for bpfilter_umh 2020-05-26 00:03:16 +09:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2020-06-25 12:52:41 -07:00
caif treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
can treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
ceph The highlights are: 2020-06-08 12:49:18 -07:00
core net: Do not clear the sock TX queue in sk_set_socket() 2020-06-23 20:49:12 -07:00
dcb treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
dccp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-06-13 16:27:13 -07:00
decnet treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
dns_resolver docs: networking: convert dns_resolver.txt to ReST 2020-04-28 14:39:46 -07:00
dsa dsa: Allow forwarding of redirected IGMP traffic 2020-06-24 14:39:43 -07:00
ethernet net: move devres helpers into a separate source file 2020-05-23 16:56:17 -07:00
ethtool ethtool: fix error handling in linkstate_prepare_data() 2020-06-25 16:17:16 -07:00
hsr hsr: avoid to create proc file after unregister 2020-06-22 20:42:23 -07:00
ieee802154 treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
ife
ipv4 tcp_cubic: fix spurious HYSTART_DELAY exit upon drop in min RTT 2020-06-25 16:08:47 -07:00
ipv6 netfilter: ip6tables: Add a .pre_exit hook in all ip6table_foo.c. 2020-06-25 00:50:31 +02:00
iucv net/af_iucv: clean up function prototypes 2020-05-19 12:50:14 -07:00
kcm treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
key
l2tp treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
l3mdev treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
lapb treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
llc af_llc: fix if-statement empty body warning 2020-02-26 20:38:13 -08:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-06-13 16:27:13 -07:00
mac802154 treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
mpls treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
mptcp mptcp: drop sndr_key in mptcp_syn_options 2020-06-22 21:06:39 -07:00
ncsi treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
netfilter netfilter: Add MODULE_DESCRIPTION entries to kernel modules 2020-06-25 00:50:31 +02:00
netlabel treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
netlink Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-06-13 16:27:13 -07:00
netrom net: change addr_list_lock back to static key 2020-06-09 12:59:45 -07:00
nfc treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
nsh treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
openvswitch openvswitch: take into account de-fragmentation/gso_size in execute_check_pkt_len 2020-06-24 14:34:58 -07:00
packet treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
phonet sysctl: pass kernel pointers to ->proc_handler 2020-04-27 02:07:40 -04:00
psample net: psample: fix build error when CONFIG_INET is not enabled 2020-05-23 16:36:05 -07:00
qrtr treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
rds net/rds: NULL pointer de-reference in rds_ib_add_one() 2020-06-15 12:58:59 -07:00
rfkill
rose net: change addr_list_lock back to static key 2020-06-09 12:59:45 -07:00
rxrpc rxrpc: Fix notification call on completion of discarded calls 2020-06-20 21:31:43 -07:00
sched sch_cake: don't try to reallocate or unshare skb unconditionally 2020-06-25 16:24:05 -07:00
sctp sctp: Don't advertise IPv4 addresses if ipv6only is set on the socket 2020-06-25 16:11:33 -07:00
smc treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
strparser
sunrpc NFS Client Updates for Linux 5.8 2020-06-11 12:22:41 -07:00
switchdev treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
tipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-06-13 16:27:13 -07:00
tls treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
unix treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
vmw_vsock vsock/vmci: make vmci_vsock_transport_cb() static 2020-06-05 13:18:26 -07:00
wimax
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-06-13 16:27:13 -07:00
x25 treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
xdp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-06-13 16:27:13 -07:00
xfrm Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec 2020-06-19 13:03:47 -07:00
compat.c switch cmsghdr_from_user_compat_to_kern() to copy_from_user() 2020-06-01 12:05:45 -07:00
devres.c net: devres: provide devm_register_netdev() 2020-05-23 16:56:17 -07:00
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile net: move devres helpers into a separate source file 2020-05-23 16:56:17 -07:00
socket.c net: remove kernel_setsockopt 2020-05-29 13:10:39 -07:00
sysctl_net.c