diff options
Diffstat (limited to 'qemu-options.hx')
| -rw-r--r-- | qemu-options.hx | 70 |
1 files changed, 69 insertions, 1 deletions
diff --git a/qemu-options.hx b/qemu-options.hx index 6be621c232..2bcf7e4e97 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -2882,6 +2882,19 @@ DEF("netdev", HAS_ARG, QEMU_OPTION_netdev, " VALE port (created on the fly) called 'name' ('nmname' is name of the \n" " netmap device, defaults to '/dev/netmap')\n" #endif +#ifdef CONFIG_AF_XDP + "-netdev af-xdp,id=str,ifname=name[,mode=native|skb][,force-copy=on|off]\n" + " [,queues=n][,start-queue=m][,inhibit=on|off][,sock-fds=x:y:...:z]\n" + " attach to the existing network interface 'name' with AF_XDP socket\n" + " use 'mode=MODE' to specify an XDP program attach mode\n" + " use 'force-copy=on|off' to force XDP copy mode even if device supports zero-copy (default: off)\n" + " use 'inhibit=on|off' to inhibit loading of a default XDP program (default: off)\n" + " with inhibit=on,\n" + " use 'sock-fds' to provide file descriptors for already open AF_XDP sockets\n" + " added to a socket map in XDP program. One socket per queue.\n" + " use 'queues=n' to specify how many queues of a multiqueue interface should be used\n" + " use 'start-queue=m' to specify the first queue that should be used\n" +#endif #ifdef CONFIG_POSIX "-netdev vhost-user,id=str,chardev=dev[,vhostforce=on|off]\n" " configure a vhost-user network, backed by a chardev 'dev'\n" @@ -2927,6 +2940,9 @@ DEF("nic", HAS_ARG, QEMU_OPTION_nic, #ifdef CONFIG_NETMAP "netmap|" #endif +#ifdef CONFIG_AF_XDP + "af-xdp|" +#endif #ifdef CONFIG_POSIX "vhost-user|" #endif @@ -2955,6 +2971,9 @@ DEF("net", HAS_ARG, QEMU_OPTION_net, #ifdef CONFIG_NETMAP "netmap|" #endif +#ifdef CONFIG_AF_XDP + "af-xdp|" +#endif #ifdef CONFIG_VMNET "vmnet-host|vmnet-shared|vmnet-bridged|" #endif @@ -2962,7 +2981,7 @@ DEF("net", HAS_ARG, QEMU_OPTION_net, " old way to initialize a host network interface\n" " (use the -netdev option if possible instead)\n", QEMU_ARCH_ALL) SRST -``-nic [tap|bridge|user|l2tpv3|vde|netmap|vhost-user|socket][,...][,mac=macaddr][,model=mn]`` +``-nic [tap|bridge|user|l2tpv3|vde|netmap|af-xdp|vhost-user|socket][,...][,mac=macaddr][,model=mn]`` This option is a shortcut for configuring both the on-board (default) guest NIC hardware and the host network backend in one go. The host backend options are the same as with the corresponding @@ -3376,6 +3395,55 @@ SRST # launch QEMU instance |qemu_system| linux.img -nic vde,sock=/tmp/myswitch +``-netdev af-xdp,id=str,ifname=name[,mode=native|skb][,force-copy=on|off][,queues=n][,start-queue=m][,inhibit=on|off][,sock-fds=x:y:...:z]`` + Configure AF_XDP backend to connect to a network interface 'name' + using AF_XDP socket. A specific program attach mode for a default + XDP program can be forced with 'mode', defaults to best-effort, + where the likely most performant mode will be in use. Number of queues + 'n' should generally match the number or queues in the interface, + defaults to 1. Traffic arriving on non-configured device queues will + not be delivered to the network backend. + + .. parsed-literal:: + + # set number of queues to 4 + ethtool -L eth0 combined 4 + # launch QEMU instance + |qemu_system| linux.img -device virtio-net-pci,netdev=n1 \\ + -netdev af-xdp,id=n1,ifname=eth0,queues=4 + + 'start-queue' option can be specified if a particular range of queues + [m, m + n] should be in use. For example, this is may be necessary in + order to use certain NICs in native mode. Kernel allows the driver to + create a separate set of XDP queues on top of regular ones, and only + these queues can be used for AF_XDP sockets. NICs that work this way + may also require an additional traffic redirection with ethtool to these + special queues. + + .. parsed-literal:: + + # set number of queues to 1 + ethtool -L eth0 combined 1 + # redirect all the traffic to the second queue (id: 1) + # note: drivers may require non-empty key/mask pair. + ethtool -N eth0 flow-type ether \\ + dst 00:00:00:00:00:00 m FF:FF:FF:FF:FF:FE action 1 + ethtool -N eth0 flow-type ether \\ + dst 00:00:00:00:00:01 m FF:FF:FF:FF:FF:FE action 1 + # launch QEMU instance + |qemu_system| linux.img -device virtio-net-pci,netdev=n1 \\ + -netdev af-xdp,id=n1,ifname=eth0,queues=1,start-queue=1 + + XDP program can also be loaded externally. In this case 'inhibit' option + should be set to 'on' and 'sock-fds' provided with file descriptors for + already open but not bound XDP sockets already added to a socket map for + corresponding queues. One socket per queue. + + .. parsed-literal:: + + |qemu_system| linux.img -device virtio-net-pci,netdev=n1 \\ + -netdev af-xdp,id=n1,ifname=eth0,queues=3,inhibit=on,sock-fds=15:16:17 + ``-netdev vhost-user,chardev=id[,vhostforce=on|off][,queues=n]`` Establish a vhost-user netdev, backed by a chardev id. The chardev should be a unix domain socket backed one. The vhost-user uses a |