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Commit 49da7e64 authored by Anton Ivanov's avatar Anton Ivanov Committed by Richard Weinberger
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High Performance UML Vector Network Driver 



1. Provides infrastructure for vector IO using recvmmsg/sendmmsg.
    1.1. Multi-message read.
    1.2. Multi-message write.
    1.3. Optimized queue support for multi-packet enqueue/dequeue.
    1.4. BQL/DQL support.
2. Implements transports for several transports as well support
for direct wiring of PWEs to NIC. Allows direct connection of VMs
to host, other VMs and network devices with no switch in use.
    2.1. Raw socket >4 times higher PPS and 10 times higher tcp RX
    than existing pcap based transport (> 4Gbit)
    2.2. New tap transport using socket RX and tap xmit. Similar
    performance improvements (>4Gbit)
    2.3. GRE transport - direct wiring to GRE PWE
    2.4. L2TPv3 transport - direct wiring to L2TPv3 PWE
3. Tuning, performance and offload related setting support via ethtool.
4. Initial BPF support - used in tap/raw to avoid software looping
5. Scatter Gather support.
6. VNET and checksum offload support for raw socket transport.
7. TSO/GSO support where applicable or available
8. Migrates all error messages to netdevice_*() and rate limits
them where needed.

Signed-off-by: default avatarAnton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent ff6a1798

arch/um/Kconfig.net

+11 −0
Original line number Diff line number Diff line
@@ -109,6 +109,17 @@ config UML_NET_DAEMON 
        more than one without conflict.  If you don't need UML networking,

        say N.



config UML_NET_VECTOR

	bool "Vector I/O high performance network devices"

	depends on UML_NET

	help

	This User-Mode Linux network driver uses multi-message send

	and receive functions. The host running the UML guest must have

	a linux kernel version above 3.0 and a libc version > 2.13.

	This driver provides tap, raw, gre and l2tpv3 network transports

	with up to 4 times higher network throughput than the UML network

	drivers.



config UML_NET_VDE

	bool "VDE transport"

	depends on UML_NET

arch/um/drivers/Makefile

+3 −1
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
slip-objs := slip_kern.o slip_user.o

slirp-objs := slirp_kern.o slirp_user.o

daemon-objs := daemon_kern.o daemon_user.o

vector-objs := vector_kern.o vector_user.o vector_transports.o

umcast-objs := umcast_kern.o umcast_user.o

net-objs := net_kern.o net_user.o

mconsole-objs := mconsole_kern.o mconsole_user.o
@@ -43,6 +44,7 @@ obj-$(CONFIG_STDERR_CONSOLE) += stderr_console.o 
obj-$(CONFIG_UML_NET_SLIP) += slip.o slip_common.o

obj-$(CONFIG_UML_NET_SLIRP) += slirp.o slip_common.o

obj-$(CONFIG_UML_NET_DAEMON) += daemon.o 

obj-$(CONFIG_UML_NET_VECTOR) += vector.o

obj-$(CONFIG_UML_NET_VDE) += vde.o

obj-$(CONFIG_UML_NET_MCAST) += umcast.o

obj-$(CONFIG_UML_NET_PCAP) += pcap.o
@@ -61,7 +63,7 @@ obj-$(CONFIG_BLK_DEV_COW_COMMON) += cow_user.o 
obj-$(CONFIG_UML_RANDOM) += random.o



# pcap_user.o must be added explicitly.

USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o vde_user.o

USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o vde_user.o vector_user.o

CFLAGS_null.o = -DDEV_NULL=$(DEV_NULL_PATH)



include arch/um/scripts/Makefile.rules

arch/um/drivers/net_kern.c

+2 −2
Original line number Diff line number Diff line
@@ -288,7 +288,7 @@ static void uml_net_user_timer_expire(struct timer_list *t) 
#endif

}



static void setup_etheraddr(struct net_device *dev, char *str)

void uml_net_setup_etheraddr(struct net_device *dev, char *str)

{

	unsigned char *addr = dev->dev_addr;

	char *end;
@@ -412,7 +412,7 @@ static void eth_configure(int n, void *init, char *mac, 
	 */

	snprintf(dev->name, sizeof(dev->name), "eth%d", n);



	setup_etheraddr(dev, mac);

	uml_net_setup_etheraddr(dev, mac);



	printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);