kernel_optimize_test/drivers/net
Jason Wang ece793fcfc macvtap: do not zerocopy if iov needs more pages than MAX_SKB_FRAGS
We try to linearize part of the skb when the number of iov is greater than
MAX_SKB_FRAGS. This is not enough since each single vector may occupy more than
one pages, so zerocopy_sg_fromiovec() may still fail and may break the guest
network.

Solve this problem by calculate the pages needed for iov before trying to do
zerocopy and switch to use copy instead of zerocopy if it needs more than
MAX_SKB_FRAGS.

This is done through introducing a new helper to count the pages for iov, and
call uarg->callback() manually when switching from zerocopy to copy to notify
vhost.

We can do further optimization on top.

This bug were introduced from b92946e291
(macvtap: zerocopy: validate vectors before building skb).

Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-18 13:04:25 -07:00
..
appletalk
arcnet
bonding
caif drivers/net: caif: fix wrong rtnl_is_locked() usage 2013-07-09 12:55:48 -07:00
can drivers/net/can/c_can: don't use devm_pinctrl_get_select_default() in probe 2013-07-11 17:18:26 -07:00
cris
dsa
ethernet be2net: Fix to avoid hardware workaround when not needed 2013-07-16 13:01:57 -07:00
fddi
hamradio
hippi
hyperv hyperv: Fix the NETIF_F_SG flag setting in netvsc 2013-07-16 23:02:24 -07:00
ieee802154 drivers/net/ieee802154: don't use devm_pinctrl_get_select_default() in probe 2013-07-11 17:18:27 -07:00
irda
phy Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-07-13 17:42:22 -07:00
plip
ppp
slip
team
usb usb/net/r815x: fix cast to restricted __le32 2013-07-12 16:13:34 -07:00
vmxnet3
wan
wimax
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2013-07-09 18:24:39 -07:00
xen-netback
dummy.c dummy: fix oops when loading the dummy failed 2013-07-11 11:59:20 -07:00
eql.c
ifb.c ifb: fix oops when loading the ifb failed 2013-07-11 12:00:05 -07:00
Kconfig
LICENSE.SRC
loopback.c
macvlan.c
macvtap.c macvtap: do not zerocopy if iov needs more pages than MAX_SKB_FRAGS 2013-07-18 13:04:25 -07:00
Makefile
mdio.c
mii.c
netconsole.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2013-07-09 18:24:39 -07:00
nlmon.c
ntb_netdev.c
rionet.c
sb1000.c
Space.c
sungem_phy.c
tun.c tuntap: do not zerocopy if iov needs more pages than MAX_SKB_FRAGS 2013-07-18 13:04:25 -07:00
veth.c
virtio_net.c No real surprises. 2013-07-10 14:50:58 -07:00
vxlan.c vxlan: add necessary locking on device removal 2013-07-17 12:51:19 -07:00
xen-netfront.c xen-netfront: pull on receive skb may need to happen earlier 2013-07-17 12:51:19 -07:00