search for: iff_one_queue

...81 100644 --- a/doc/tinc.conf.5.in +++ b/doc/tinc.conf.5.in @@ -255,6 +255,9 @@ a lookup if your DNS server is not responding. This does not affect resolving hostnames to IP addresses from the host configuration files. +.It Va IffOneQueue Li = yes | no Po no Pc Bq experimental +(Linux only) Set IFF_ONE_QUEUE flag on TUN/TAP devices. + .It Va Interface Li = Ar interface Defines the name of the interface corresponding to the virtual network device. Depending on the operating system and the type of device this may or may not actually set the name of the interface. diff --git a/src/linux/device.c b/src/...

...de <sys/ioctl.h> #include <sys/stat.h> #include <fcntl.h> #include <err.h> #include <stdio.h> static struct { unsigned int flag; const char *name; } known_flags[] = { { IFF_TUN, "TUN" }, { IFF_TAP, "TAP" }, { IFF_NO_PI, "NO_PI" }, { IFF_ONE_QUEUE, "ONE_QUEUE" }, }; int main() { unsigned int features, i; int netfd = open("/dev/net/tun", O_RDWR); if (netfd < 0) err(1, "Opening /dev/net/tun"); if (ioctl(netfd, TUNGETFEATURES, &features) != 0) { printf("Kernel does not support TUNGETFEATURES,...

...de <sys/ioctl.h> #include <sys/stat.h> #include <fcntl.h> #include <err.h> #include <stdio.h> static struct { unsigned int flag; const char *name; } known_flags[] = { { IFF_TUN, "TUN" }, { IFF_TAP, "TAP" }, { IFF_NO_PI, "NO_PI" }, { IFF_ONE_QUEUE, "ONE_QUEUE" }, }; int main() { unsigned int features, i; int netfd = open("/dev/net/tun", O_RDWR); if (netfd < 0) err(1, "Opening /dev/net/tun"); if (ioctl(netfd, TUNGETFEATURES, &features) != 0) { printf("Kernel does not support TUNGETFEATURES,...

...de <sys/ioctl.h> #include <sys/stat.h> #include <fcntl.h> #include <err.h> #include <stdio.h> static struct { unsigned int flag; const char *name; } known_flags[] = { { IFF_TUN, "TUN" }, { IFF_TAP, "TAP" }, { IFF_NO_PI, "NO_PI" }, { IFF_ONE_QUEUE, "ONE_QUEUE" }, }; int main() { unsigned int features, i; int netfd = open("/dev/net/tun", O_RDWR); if (netfd < 0) err(1, "Opening /dev/net/tun"); if (ioctl(netfd, TUNGETFEATURES, &features) != 0) { printf("Kernel does not support TUNGETFEATURES,...

...de <sys/ioctl.h> #include <sys/stat.h> #include <fcntl.h> #include <err.h> #include <stdio.h> static struct { unsigned int flag; const char *name; } known_flags[] = { { IFF_TUN, "TUN" }, { IFF_TAP, "TAP" }, { IFF_NO_PI, "NO_PI" }, { IFF_ONE_QUEUE, "ONE_QUEUE" }, }; int main() { unsigned int features, i; int netfd = open("/dev/net/tun", O_RDWR); if (netfd < 0) err(1, "Opening /dev/net/tun"); if (ioctl(netfd, TUNGETFEATURES, &features) != 0) { printf("Kernel does not support TUNGETFEATURES,...

...client host, instead of building one giant VPN with a single daemon at the central host. This allows the CPU load to be spread over multiple CPU cores. There are a few other issues which may warrant some source changes though: 3) When looking at txqueuelen issues, I stumbled on a tun device flag IFF_ONE_QUEUE (and the corresponding TUN_ONE_QUEUE) in the Linux tun source. Some other VPN software out there (openvpn for example) seems to set this on all tun devices. Whether it helps or hurts in any given situation on a modern Linux host is unclear to me just from reading the source. It's possible th...

1) Turn GSO on virtio net into an all-or-nothing (keep checksumming separate). Having multiple bits is a pain: if you can't support something you should handle it in software, which is still a performance win. 2) Make VIRTIO_NET_HDR_GSO_ECN a flag in the header, so it can apply to IPv6 or v4. 3) Rename VIRTIO_NET_F_NO_CSUM to VIRTIO_NET_F_CSUM (ie. means we do checksumming). 4)

1) Turn GSO on virtio net into an all-or-nothing (keep checksumming separate). Having multiple bits is a pain: if you can't support something you should handle it in software, which is still a performance win. 2) Make VIRTIO_NET_HDR_GSO_ECN a flag in the header, so it can apply to IPv6 or v4. 3) Rename VIRTIO_NET_F_NO_CSUM to VIRTIO_NET_F_CSUM (ie. means we do checksumming). 4)

...ev->name); + + ifr->ifr_flags = 0; + + if (ifr->ifr_flags & TUN_TUN_DEV) + ifr->ifr_flags |= IFF_TUN; + else + ifr->ifr_flags |= IFF_TAP; + + if (tun->flags & TUN_NO_PI) + ifr->ifr_flags |= IFF_NO_PI; + + if (tun->flags & TUN_ONE_QUEUE) + ifr->ifr_flags |= IFF_ONE_QUEUE; + + if (tun->flags & TUN_VNET_HDR) + ifr->ifr_flags |= IFF_VNET_HDR; + + return 0; +} + /* This is like a cut-down ethtool ops, except done via tun fd so no * privs required. */ static int set_offload(struct net_device *dev, unsigned long arg) @@ -833,6 +863,15 @@ static int tun_chr...

...ev->name); + + ifr->ifr_flags = 0; + + if (ifr->ifr_flags & TUN_TUN_DEV) + ifr->ifr_flags |= IFF_TUN; + else + ifr->ifr_flags |= IFF_TAP; + + if (tun->flags & TUN_NO_PI) + ifr->ifr_flags |= IFF_NO_PI; + + if (tun->flags & TUN_ONE_QUEUE) + ifr->ifr_flags |= IFF_ONE_QUEUE; + + if (tun->flags & TUN_VNET_HDR) + ifr->ifr_flags |= IFF_VNET_HDR; + + return 0; +} + /* This is like a cut-down ethtool ops, except done via tun fd so no * privs required. */ static int set_offload(struct net_device *dev, unsigned long arg) @@ -833,6 +863,15 @@ static int tun_chr...

...s/net/tun.c > +++ b/drivers/net/tun.c > @@ -111,6 +111,7 @@ do { \ > #define TUN_FASYNC IFF_ATTACH_QUEUE > /* High bits in flags field are unused. */ > #define TUN_VNET_LE 0x80000000 > +#define TUN_VNET_BE 0x40000000 > > #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ > IFF_MULTI_QUEUE) > @@ -206,11 +207,25 @@ struct tun_struct { > u32 flow_count; > }; > > +#ifdef CONFIG_TUN_VNET_BE > +static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) > +{ > + if (tun->flags & TUN_VNET_BE) &g...

...s/net/tun.c > +++ b/drivers/net/tun.c > @@ -111,6 +111,7 @@ do { \ > #define TUN_FASYNC IFF_ATTACH_QUEUE > /* High bits in flags field are unused. */ > #define TUN_VNET_LE 0x80000000 > +#define TUN_VNET_BE 0x40000000 > > #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ > IFF_MULTI_QUEUE) > @@ -206,11 +207,25 @@ struct tun_struct { > u32 flow_count; > }; > > +#ifdef CONFIG_TUN_VNET_BE > +static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) > +{ > + if (tun->flags & TUN_VNET_BE) &g...

...dex 053f9b6..4e12488 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -111,6 +111,7 @@ do { \ #define TUN_FASYNC IFF_ATTACH_QUEUE /* High bits in flags field are unused. */ #define TUN_VNET_LE 0x80000000 +#define TUN_VNET_BE 0x40000000 #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ IFF_MULTI_QUEUE) @@ -206,11 +207,25 @@ struct tun_struct { u32 flow_count; }; +#ifdef CONFIG_TUN_VNET_BE +static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) +{ + if (tun->flags & TUN_VNET_BE) + return false; + return virtio_legacy_is_litt...

...dex 7c4f6b6..9fa05d6 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -111,6 +111,7 @@ do { \ #define TUN_FASYNC IFF_ATTACH_QUEUE /* High bits in flags field are unused. */ #define TUN_VNET_LE 0x80000000 +#define TUN_VNET_BE 0x40000000 #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ IFF_MULTI_QUEUE) @@ -206,10 +207,58 @@ struct tun_struct { u32 flow_count; }; +#ifdef CONFIG_TUN_VNET_CROSS_LE +static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) +{ + return tun->flags & TUN_VNET_BE ? false : + virtio_legacy_is_little_en...

...tun.c > > @@ -111,6 +111,7 @@ do { \ > > #define TUN_FASYNC IFF_ATTACH_QUEUE > > /* High bits in flags field are unused. */ > > #define TUN_VNET_LE 0x80000000 > > +#define TUN_VNET_BE 0x40000000 > > > > #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ > > IFF_MULTI_QUEUE) > > @@ -206,11 +207,25 @@ struct tun_struct { > > u32 flow_count; > > }; > > > > +#ifdef CONFIG_TUN_VNET_BE > > +static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) > > +{ > &...

...1d..080003c 100644 > --- a/include/uapi/linux/if_tun.h > +++ b/include/uapi/linux/if_tun.h > @@ -61,6 +61,7 @@ > #define IFF_TUN 0x0001 > #define IFF_TAP 0x0002 > #define IFF_NO_PI 0x1000 > +#define IFF_TX_ARRAY 0x0010 > /* This flag has no real effect */ > #define IFF_ONE_QUEUE 0x2000 > #define IFF_VNET_HDR 0x4000 > -- > 2.7.4

...n.h b/include/uapi/linux/if_tun.h index 3cb5e1d..080003c 100644 --- a/include/uapi/linux/if_tun.h +++ b/include/uapi/linux/if_tun.h @@ -61,6 +61,7 @@ #define IFF_TUN 0x0001 #define IFF_TAP 0x0002 #define IFF_NO_PI 0x1000 +#define IFF_TX_ARRAY 0x0010 /* This flag has no real effect */ #define IFF_ONE_QUEUE 0x2000 #define IFF_VNET_HDR 0x4000 -- 2.7.4

...n.h b/include/uapi/linux/if_tun.h index 3cb5e1d..080003c 100644 --- a/include/uapi/linux/if_tun.h +++ b/include/uapi/linux/if_tun.h @@ -61,6 +61,7 @@ #define IFF_TUN 0x0001 #define IFF_TAP 0x0002 #define IFF_NO_PI 0x1000 +#define IFF_TX_ARRAY 0x0010 /* This flag has no real effect */ #define IFF_ONE_QUEUE 0x2000 #define IFF_VNET_HDR 0x4000 -- 2.7.4

Hi: Here are the patches I used for testing KVM with virtio-net using TSO. There are three patches for the tun device which are basically Rusty's patches with the mmap turned into copying (for correctness). Two patches are for the virtio-net frontend, one required to support receiving SG/TSO, and the other useful for testing SG per se. The other patch is to the KVM backend to make all this

Hi: Here are the patches I used for testing KVM with virtio-net using TSO. There are three patches for the tun device which are basically Rusty's patches with the mmap turned into copying (for correctness). Two patches are for the virtio-net frontend, one required to support receiving SG/TSO, and the other useful for testing SG per se. The other patch is to the KVM backend to make all this