@@ -10,6 +10,7 @@ DOC_SOURCE = \
Documentation/intro/why-ovs.rst \
Documentation/intro/install/index.rst \
Documentation/intro/install/bash-completion.rst \
+ Documentation/intro/install/afxdp.rst \
Documentation/intro/install/debian.rst \
Documentation/intro/install/documentation.rst \
Documentation/intro/install/distributions.rst \
@@ -59,6 +59,7 @@ vSwitch? Start here.
:doc:`intro/install/windows` |
:doc:`intro/install/xenserver` |
:doc:`intro/install/dpdk` |
+ :doc:`intro/install/afxdp` |
:doc:`Installation FAQs <faq/releases>`
- **Tutorials:** :doc:`tutorials/faucet` |
new file mode 100644
@@ -0,0 +1,432 @@
+..
+ Licensed under the Apache License, Version 2.0 (the "License"); you may
+ not use this file except in compliance with the License. You may obtain
+ a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ License for the specific language governing permissions and limitations
+ under the License.
+
+ Convention for heading levels in Open vSwitch documentation:
+
+ ======= Heading 0 (reserved for the title in a document)
+ ------- Heading 1
+ ~~~~~~~ Heading 2
+ +++++++ Heading 3
+ ''''''' Heading 4
+
+ Avoid deeper levels because they do not render well.
+
+
+========================
+Open vSwitch with AF_XDP
+========================
+
+This document describes how to build and install Open vSwitch using
+AF_XDP netdev.
+
+.. warning::
+ The AF_XDP support of Open vSwitch is considered 'experimental',
+ and it is not compiled in by default.
+
+
+Introduction
+------------
+AF_XDP, Address Family of the eXpress Data Path, is a new Linux socket type
+built upon the eBPF and XDP technology. It is aims to have comparable
+performance to DPDK but cooperate better with existing kernel's networking
+stack. An AF_XDP socket receives and sends packets from an eBPF/XDP program
+attached to the netdev, by-passing a couple of Linux kernel's subsystems.
+As a result, AF_XDP socket shows much better performance than AF_PACKET.
+For more details about AF_XDP, please see linux kernel's
+Documentation/networking/af_xdp.rst
+
+
+AF_XDP Netdev
+-------------
+OVS has a couple of netdev types, i.e., system, tap, or
+dpdk. The AF_XDP feature adds a new netdev types called
+"afxdp", and implement its configuration, packet reception,
+and transmit functions. Since the AF_XDP socket, called xsk,
+operates in userspace, once ovs-vswitchd receives packets
+from xsk, the afxdp netdev re-uses the existing userspace
+dpif-netdev datapath. As a result, most of the packet processing
+happens at the userspace instead of linux kernel.
+
+::
+
+ | +-------------------+
+ | | ovs-vswitchd |<-->ovsdb-server
+ | +-------------------+
+ | | ofproto |<-->OpenFlow controllers
+ | +--------+-+--------+
+ | | netdev | |ofproto-|
+ userspace | +--------+ | dpif |
+ | | afxdp | +--------+
+ | | netdev | | dpif |
+ | +---||---+ +--------+
+ | || | dpif- |
+ | || | netdev |
+ |_ || +--------+
+ ||
+ _ +---||-----+--------+
+ | | AF_XDP prog + |
+ kernel | | xsk_map |
+ |_ +--------||---------+
+ ||
+ physical
+ NIC
+
+
+Build requirements
+------------------
+
+In addition to the requirements described in :doc:`general`, building Open
+vSwitch with AF_XDP will require the following:
+
+- libbpf from kernel source tree (kernel 5.0.0 or later)
+
+- Linux kernel XDP support, with the following options (required)
+
+ * CONFIG_BPF=y
+
+ * CONFIG_BPF_SYSCALL=y
+
+ * CONFIG_XDP_SOCKETS=y
+
+
+- The following optional Kconfig options are also recommended, but not
+ required:
+
+ * CONFIG_BPF_JIT=y (Performance)
+
+ * CONFIG_HAVE_BPF_JIT=y (Performance)
+
+ * CONFIG_XDP_SOCKETS_DIAG=y (Debugging)
+
+- Once your AF_XDP-enabled kernel is ready, if possible, run
+ **./xdpsock -r -N -z -i <your device>** under linux/samples/bpf.
+ This is an OVS independent benchmark tools for AF_XDP.
+ It makes sure your basic kernel requirements are met for AF_XDP.
+
+
+Installing
+----------
+For OVS to use AF_XDP netdev, it has to be configured with LIBBPF support.
+First, clone a recent version of Linux bpf-next tree::
+
+ git clone git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git
+
+Second, go into the Linux source directory and build libbpf in the tools
+directory::
+
+ cd bpf-next/
+ cd tools/lib/bpf/
+ make && make install
+ make install_headers
+
+.. note::
+ Make sure xsk.h and bpf.h are installed in system's library path,
+ e.g. /usr/local/include/bpf/ or /usr/include/bpf/
+
+Make sure the libbpf.so is installed correctly::
+
+ ldconfig
+ ldconfig -p | grep libbpf
+
+Third, ensure the standard OVS requirements are installed and
+bootstrap/configure the package::
+
+ ./boot.sh && ./configure --enable-afxdp
+
+Finally, build and install OVS::
+
+ make && make install
+
+To kick start end-to-end autotesting::
+
+ uname -a # make sure having 5.0+ kernel
+ make check-afxdp TESTSUITEFLAGS='1'
+
+.. note::
+ Not all test cases pass at this time. Currenly all TCP related
+ tests, ex: using wget or http, are skipped due to XDP limitations
+ on veth. cvlan test is also skipped.
+
+If a test case fails, check the log at::
+
+ cat \
+ tests/system-afxdp-testsuite.dir/<test num>/system-afxdp-testsuite.log
+
+
+Setup AF_XDP netdev
+-------------------
+Before running OVS with AF_XDP, make sure the libbpf and libelf are
+set-up right::
+
+ ldd vswitchd/ovs-vswitchd
+
+Open vSwitch should be started using userspace datapath as described
+in :doc:`general`::
+
+ ovs-vswitchd ...
+ ovs-vsctl -- add-br br0 -- set Bridge br0 datapath_type=netdev
+
+Make sure your device driver support AF_XDP, and to use 1 PMD (on core 4)
+on 1 queue (queue 0) device, configure these options: **pmd-cpu-mask,
+pmd-rxq-affinity, and n_rxq**. The **xdpmode** can be "drv" or "skb"::
+
+ ethtool -L enp2s0 combined 1
+ ovs-vsctl set Open_vSwitch . other_config:pmd-cpu-mask=0x10
+ ovs-vsctl add-port br0 enp2s0 -- set interface enp2s0 type="afxdp" \
+ options:n_rxq=1 options:xdpmode=drv \
+ other_config:pmd-rxq-affinity="0:4"
+
+Or, use 4 pmds/cores and 4 queues by doing::
+
+ ethtool -L enp2s0 combined 4
+ ovs-vsctl set Open_vSwitch . other_config:pmd-cpu-mask=0x36
+ ovs-vsctl add-port br0 enp2s0 -- set interface enp2s0 type="afxdp" \
+ options:n_rxq=4 options:xdpmode=drv \
+ other_config:pmd-rxq-affinity="0:1,1:2,2:3,3:4"
+
+.. note::
+ pmd-rxq-affinity is optional. If not specified, system will auto-assign.
+
+To validate that the bridge has successfully instantiated, you can use the::
+
+ ovs-vsctl show
+
+Should show something like::
+
+ Port "ens802f0"
+ Interface "ens802f0"
+ type: afxdp
+ options: {n_rxq="1", xdpmode=drv}
+
+Otherwise, enable debugging by::
+
+ ovs-appctl vlog/set netdev_afxdp::dbg
+
+
+References
+----------
+Most of the design details are described in the paper presented at
+Linux Plumber 2018, "Bringing the Power of eBPF to Open vSwitch"[1],
+section 4, and slides[2][4].
+"The Path to DPDK Speeds for AF XDP"[3] gives a very good introduction
+about AF_XDP current and future work.
+
+[1] http://vger.kernel.org/lpc_net2018_talks/ovs-ebpf-afxdp.pdf
+
+[2] http://vger.kernel.org/lpc_net2018_talks/ovs-ebpf-lpc18-presentation.pdf
+
+[3] http://vger.kernel.org/lpc_net2018_talks/lpc18_paper_af_xdp_perf-v2.pdf
+
+[4] https://ovsfall2018.sched.com/event/IO7p/fast-userspace-ovs-with-afxdp
+
+
+Performance Tuning
+------------------
+The name of the game is to keep your CPU running in userspace, allowing PMD
+to keep polling the AF_XDP queues without any interferences from kernel.
+
+#. Make sure everything is in the same NUMA node (memory used by AF_XDP, pmd
+ running cores, device plug-in slot)
+
+#. Isolate your CPU by doing isolcpu at grub configure.
+
+#. IRQ should not set to pmd running core.
+
+#. The Spectre and Meltdown fixes increase the overhead of system calls.
+
+
+Debugging performance issue
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+While running the traffic, use linux perf tool to see where your cpu
+spends its cycle::
+
+ cd bpf-next/tools/perf
+ make
+ ./perf record -p `pidof ovs-vswitchd` sleep 10
+ ./perf report
+
+Measure your system call rate by doing::
+
+ pstree -p `pidof ovs-vswitchd`
+ strace -c -p <your pmd's PID>
+
+Or, use OVS pmd tool::
+
+ ovs-appctl dpif-netdev/pmd-stats-show
+
+
+Example Script
+--------------
+
+Below is a script using namespaces and veth peer::
+
+ #!/bin/bash
+ ovs-vswitchd --no-chdir --pidfile -vvconn -vofproto_dpif -vunixctl \
+ --disable-system --detach \
+ ovs-vsctl -- add-br br0 -- set Bridge br0 \
+ protocols=OpenFlow10,OpenFlow11,OpenFlow12,OpenFlow13,OpenFlow14 \
+ fail-mode=secure datapath_type=netdev
+ ovs-vsctl -- add-br br0 -- set Bridge br0 datapath_type=netdev
+
+ ip netns add at_ns0
+ ovs-appctl vlog/set netdev_afxdp::dbg
+
+ ip link add p0 type veth peer name afxdp-p0
+ ip link set p0 netns at_ns0
+ ip link set dev afxdp-p0 up
+ ovs-vsctl add-port br0 afxdp-p0 -- \
+ set interface afxdp-p0 external-ids:iface-id="p0" type="afxdp"
+
+ ip netns exec at_ns0 sh << NS_EXEC_HEREDOC
+ ip addr add "10.1.1.1/24" dev p0
+ ip link set dev p0 up
+ NS_EXEC_HEREDOC
+
+ ip netns add at_ns1
+ ip link add p1 type veth peer name afxdp-p1
+ ip link set p1 netns at_ns1
+ ip link set dev afxdp-p1 up
+
+ ovs-vsctl add-port br0 afxdp-p1 -- \
+ set interface afxdp-p1 external-ids:iface-id="p1" type="afxdp"
+ ip netns exec at_ns1 sh << NS_EXEC_HEREDOC
+ ip addr add "10.1.1.2/24" dev p1
+ ip link set dev p1 up
+ NS_EXEC_HEREDOC
+
+ ip netns exec at_ns0 ping -i .2 10.1.1.2
+
+
+Limitations/Known Issues
+------------------------
+#. Device's numa ID is always 0, need a way to find numa id from a netdev.
+#. No QoS support because AF_XDP netdev by-pass the Linux TC layer. A possible
+ work-around is to use OpenFlow meter action.
+#. Most of the tests are done using i40e single port. Multiple ports and
+ also ixgbe driver also needs to be tested.
+#. No latency test result (TODO items)
+#. Due to limitations of current upstream kernel, TCP and various offloading
+ (vlan, cvlan) is not working over virtual interfaces (i.e. veth pair).
+
+
+PVP using tap device
+--------------------
+Assume you have enp2s0 as physical nic, and a tap device connected to VM.
+First, start OVS, then add physical port::
+
+ ethtool -L enp2s0 combined 1
+ ovs-vsctl set Open_vSwitch . other_config:pmd-cpu-mask=0x10
+ ovs-vsctl add-port br0 enp2s0 -- set interface enp2s0 type="afxdp" \
+ options:n_rxq=1 options:xdpmode=drv \
+ other_config:pmd-rxq-affinity="0:4"
+
+Start a VM with virtio and tap device::
+
+ qemu-system-x86_64 -hda ubuntu1810.qcow \
+ -m 4096 \
+ -cpu host,+x2apic -enable-kvm \
+ -device virtio-net-pci,mac=00:02:00:00:00:01,netdev=net0,mq=on,\
+ vectors=10,mrg_rxbuf=on,rx_queue_size=1024 \
+ -netdev type=tap,id=net0,vhost=on,queues=8 \
+ -object memory-backend-file,id=mem,size=4096M,\
+ mem-path=/dev/hugepages,share=on \
+ -numa node,memdev=mem -mem-prealloc -smp 2
+
+Create OpenFlow rules::
+
+ ovs-vsctl add-port br0 tap0 -- set interface tap0
+ ovs-ofctl del-flows br0
+ ovs-ofctl add-flow br0 "in_port=enp2s0, actions=output:tap0"
+ ovs-ofctl add-flow br0 "in_port=tap0, actions=output:enp2s0"
+
+Inside the VM, use xdp_rxq_info to bounce back the traffic::
+
+ ./xdp_rxq_info --dev ens3 --action XDP_TX
+
+
+PVP using vhostuser device
+--------------------------
+First, build OVS with DPDK and AFXDP::
+
+ ./configure --enable-afxdp --with-dpdk=<dpdk path>
+ make -j4 && make install
+
+Create a vhost-user port from OVS::
+
+ ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-init=true
+ ovs-vsctl -- add-br br0 -- set Bridge br0 datapath_type=netdev \
+ other_config:pmd-cpu-mask=0xfff
+ ovs-vsctl add-port br0 vhost-user-1 \
+ -- set Interface vhost-user-1 type=dpdkvhostuser
+
+Start VM using vhost-user mode::
+
+ qemu-system-x86_64 -hda ubuntu1810.qcow \
+ -m 4096 \
+ -cpu host,+x2apic -enable-kvm \
+ -chardev socket,id=char1,path=/usr/local/var/run/openvswitch/vhost-user-1 \
+ -netdev type=vhost-user,id=mynet1,chardev=char1,vhostforce,queues=4 \
+ -device virtio-net-pci,mac=00:00:00:00:00:01,\
+ netdev=mynet1,mq=on,vectors=10 \
+ -object memory-backend-file,id=mem,size=4096M,\
+ mem-path=/dev/hugepages,share=on \
+ -numa node,memdev=mem -mem-prealloc -smp 2
+
+Setup the OpenFlow ruls::
+
+ ovs-ofctl del-flows br0
+ ovs-ofctl add-flow br0 "in_port=enp2s0, actions=output:vhost-user-1"
+ ovs-ofctl add-flow br0 "in_port=vhost-user-1, actions=output:enp2s0"
+
+Inside the VM, use xdp_rxq_info to drop or bounce back the traffic::
+
+ ./xdp_rxq_info --dev ens3 --action XDP_DROP
+ ./xdp_rxq_info --dev ens3 --action XDP_TX
+
+
+PCP container using veth
+------------------------
+Create namespace and veth peer devices::
+
+ ip netns add at_ns0
+ ip link add p0 type veth peer name afxdp-p0
+ ip link set p0 netns at_ns0
+ ip link set dev afxdp-p0 up
+ ip netns exec at_ns0 ip link set dev p0 up
+
+Attach the veth port to br0 (linux kernel mode)::
+
+ ovs-vsctl add-port br0 afxdp-p0 -- \
+ set interface afxdp-p0 options:n_rxq=1
+
+Or, use AF_XDP with skb mode::
+
+ ovs-vsctl add-port br0 afxdp-p0 -- \
+ set interface afxdp-p0 type="afxdp" options:n_rxq=1 options:xdpmode=skb
+
+Setup the OpenFlow rules::
+
+ ovs-ofctl del-flows br0
+ ovs-ofctl add-flow br0 "in_port=enp2s0, actions=output:afxdp-p0"
+ ovs-ofctl add-flow br0 "in_port=afxdp-p0, actions=output:enp2s0"
+
+In the namespace, run drop or bounce back the packet::
+
+ ip netns exec at_ns0 ./xdp_rxq_info --dev p0 --action XDP_DROP
+ ip netns exec at_ns0 ./xdp_rxq_info --dev p0 --action XDP_TX
+
+
+Bug Reporting
+-------------
+
+Please report problems to dev@openvswitch.org.
@@ -45,6 +45,7 @@ Installation from Source
xenserver
userspace
dpdk
+ afxdp
Installation from Packages
--------------------------
@@ -62,6 +62,7 @@ Post-v2.11.0
- 'ovs-dpctl dump-flows' is no longer suitable for dumping offloaded flows.
'ovs-appctl dpctl/dump-flows' should be used instead.
- Add L2 GRE tunnel over IPv6 support.
+ - Add Linux AF_XDP support through a new experimental netdev type, "afxdp".
v2.11.0 - 19 Feb 2019
@@ -238,6 +238,41 @@ AC_DEFUN([OVS_FIND_DEPENDENCY], [
])
])
+dnl OVS_CHECK_LINUX_AF_XDP
+dnl
+dnl Check both Linux kernel AF_XDP and libbpf support
+AC_DEFUN([OVS_CHECK_LINUX_AF_XDP], [
+ AC_ARG_ENABLE([afxdp],
+ [AC_HELP_STRING([--enable-afxdp], [Enable AF-XDP support])],
+ [], [enable_afxdp=no])
+ AC_MSG_CHECKING([whether AF_XDP is enabled])
+ if test "$enable_afxdp" != yes; then
+ AC_MSG_RESULT([no])
+ AF_XDP_ENABLE=false
+ else
+ AC_MSG_RESULT([yes])
+ AF_XDP_ENABLE=true
+
+ AC_CHECK_HEADER([bpf/libbpf.h], [],
+ [AC_MSG_ERROR([unable to find bpf/libbpf.h for AF_XDP support])])
+
+ AC_CHECK_HEADER([linux/if_xdp.h], [],
+ [AC_MSG_ERROR([unable to find linux/if_xdp.h for AF_XDP support])])
+
+ AC_CHECK_HEADER([bpf/xsk.h], [],
+ [AC_MSG_ERROR([unable to find bpf/xsk.h for AF_XDP support])])
+
+ AC_CHECK_FUNCS([pthread_spin_lock], [],
+ [AC_MSG_ERROR([unable to find pthread_spin_lock for AF_XDP support])])
+
+ AC_DEFINE([HAVE_AF_XDP], [1],
+ [Define to 1 if AF_XDP support is available and enabled.])
+ LIBBPF_LDADD=" -lbpf -lelf"
+ AC_SUBST([LIBBPF_LDADD])
+ fi
+ AM_CONDITIONAL([HAVE_AF_XDP], test "$AF_XDP_ENABLE" = true)
+])
+
dnl OVS_CHECK_DPDK
dnl
dnl Configure DPDK source tree
@@ -98,6 +98,7 @@ OVS_CHECK_SPHINX
OVS_CHECK_DOT
OVS_CHECK_IF_DL
OVS_CHECK_STRTOK_R
+OVS_CHECK_LINUX_AF_XDP
AC_CHECK_DECLS([sys_siglist], [], [], [[#include <signal.h>]])
AC_CHECK_MEMBERS([struct stat.st_mtim.tv_nsec, struct stat.st_mtimensec],
[], [], [[#include <sys/stat.h>]])
@@ -9,6 +9,7 @@ lib_LTLIBRARIES += lib/libopenvswitch.la
lib_libopenvswitch_la_LIBADD = $(SSL_LIBS)
lib_libopenvswitch_la_LIBADD += $(CAPNG_LDADD)
+lib_libopenvswitch_la_LIBADD += $(LIBBPF_LDADD)
if WIN32
lib_libopenvswitch_la_LIBADD += ${PTHREAD_LIBS}
@@ -394,6 +395,7 @@ lib_libopenvswitch_la_SOURCES += \
lib/if-notifier.h \
lib/netdev-linux.c \
lib/netdev-linux.h \
+ lib/netdev-linux-private.h \
lib/netdev-offload-tc.c \
lib/netlink-conntrack.c \
lib/netlink-conntrack.h \
@@ -410,6 +412,14 @@ lib_libopenvswitch_la_SOURCES += \
lib/tc.h
endif
+if HAVE_AF_XDP
+lib_libopenvswitch_la_SOURCES += \
+ lib/netdev-afxdp-pool.c \
+ lib/netdev-afxdp-pool.h \
+ lib/netdev-afxdp.c \
+ lib/netdev-afxdp.h
+endif
+
if DPDK_NETDEV
lib_libopenvswitch_la_SOURCES += \
lib/dpdk.c \
@@ -19,6 +19,7 @@
#include <string.h>
#include "dp-packet.h"
+#include "netdev-afxdp.h"
#include "netdev-dpdk.h"
#include "openvswitch/dynamic-string.h"
#include "util.h"
@@ -59,6 +60,22 @@ dp_packet_use(struct dp_packet *b, void *base, size_t allocated)
dp_packet_use__(b, base, allocated, DPBUF_MALLOC);
}
+#if HAVE_AF_XDP
+/* Initialize 'b' as an empty dp_packet that contains
+ * memory starting at AF_XDP umem base.
+ */
+void
+dp_packet_use_afxdp(struct dp_packet *b, void *data, size_t allocated,
+ size_t headroom)
+{
+ dp_packet_set_base(b, (char *)data - headroom);
+ dp_packet_set_data(b, data);
+ dp_packet_set_size(b, 0);
+
+ dp_packet_init__(b, allocated, DPBUF_AFXDP);
+}
+#endif
+
/* Initializes 'b' as an empty dp_packet that contains the 'allocated' bytes of
* memory starting at 'base'. 'base' should point to a buffer on the stack.
* (Nothing actually relies on 'base' being allocated on the stack. It could
@@ -122,6 +139,8 @@ dp_packet_uninit(struct dp_packet *b)
* created as a dp_packet */
free_dpdk_buf((struct dp_packet*) b);
#endif
+ } else if (b->source == DPBUF_AFXDP) {
+ free_afxdp_buf(b);
}
}
}
@@ -248,6 +267,9 @@ dp_packet_resize__(struct dp_packet *b, size_t new_headroom, size_t new_tailroom
case DPBUF_STACK:
OVS_NOT_REACHED();
+ case DPBUF_AFXDP:
+ OVS_NOT_REACHED();
+
case DPBUF_STUB:
b->source = DPBUF_MALLOC;
new_base = xmalloc(new_allocated);
@@ -433,6 +455,7 @@ dp_packet_steal_data(struct dp_packet *b)
{
void *p;
ovs_assert(b->source != DPBUF_DPDK);
+ ovs_assert(b->source != DPBUF_AFXDP);
if (b->source == DPBUF_MALLOC && dp_packet_data(b) == dp_packet_base(b)) {
p = dp_packet_data(b);
@@ -25,6 +25,7 @@
#include <rte_mbuf.h>
#endif
+#include "netdev-afxdp.h"
#include "netdev-dpdk.h"
#include "openvswitch/list.h"
#include "packets.h"
@@ -42,6 +43,7 @@ enum OVS_PACKED_ENUM dp_packet_source {
DPBUF_DPDK, /* buffer data is from DPDK allocated memory.
* ref to dp_packet_init_dpdk() in dp-packet.c.
*/
+ DPBUF_AFXDP, /* Buffer data from XDP frame. */
};
#define DP_PACKET_CONTEXT_SIZE 64
@@ -89,6 +91,13 @@ struct dp_packet {
};
};
+#if HAVE_AF_XDP
+struct dp_packet_afxdp {
+ struct umem_pool *mpool;
+ struct dp_packet packet;
+};
+#endif
+
static inline void *dp_packet_data(const struct dp_packet *);
static inline void dp_packet_set_data(struct dp_packet *, void *);
static inline void *dp_packet_base(const struct dp_packet *);
@@ -122,7 +131,9 @@ static inline const void *dp_packet_get_nd_payload(const struct dp_packet *);
void dp_packet_use(struct dp_packet *, void *, size_t);
void dp_packet_use_stub(struct dp_packet *, void *, size_t);
void dp_packet_use_const(struct dp_packet *, const void *, size_t);
-
+#if HAVE_AF_XDP
+void dp_packet_use_afxdp(struct dp_packet *, void *, size_t, size_t);
+#endif
void dp_packet_init_dpdk(struct dp_packet *);
void dp_packet_init(struct dp_packet *, size_t);
@@ -184,6 +195,11 @@ dp_packet_delete(struct dp_packet *b)
return;
}
+ if (b->source == DPBUF_AFXDP) {
+ free_afxdp_buf(b);
+ return;
+ }
+
dp_packet_uninit(b);
free(b);
}
@@ -21,6 +21,7 @@
#include <stddef.h>
#include <stdint.h>
#include <string.h>
+#include <time.h>
#include <math.h>
#ifdef DPDK_NETDEV
@@ -186,6 +187,22 @@ struct pmd_perf_stats {
char *log_reason;
};
+#ifdef __linux__
+static inline uint64_t
+rdtsc_syscall(struct pmd_perf_stats *s)
+{
+ struct timespec val;
+ uint64_t v;
+
+ if (clock_gettime(CLOCK_MONOTONIC_RAW, &val) != 0) {
+ return s->last_tsc;
+ }
+
+ v = val.tv_sec * UINT64_C(1000000000) + val.tv_nsec;
+ return s->last_tsc = v;
+}
+#endif
+
/* Support for accurate timing of PMD execution on TSC clock cycle level.
* These functions are intended to be invoked in the context of pmd threads. */
@@ -198,6 +215,13 @@ cycles_counter_update(struct pmd_perf_stats *s)
{
#ifdef DPDK_NETDEV
return s->last_tsc = rte_get_tsc_cycles();
+#elif !defined(_MSC_VER) && defined(__x86_64__)
+ uint32_t h, l;
+ asm volatile("rdtsc" : "=a" (l), "=d" (h));
+
+ return s->last_tsc = ((uint64_t) h << 32) | l;
+#elif defined(__linux__)
+ return rdtsc_syscall(s);
#else
return s->last_tsc = 0;
#endif
new file mode 100644
@@ -0,0 +1,167 @@
+/*
+ * Copyright (c) 2018, 2019 Nicira, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <config.h>
+
+#include "dp-packet.h"
+#include "netdev-afxdp-pool.h"
+#include "openvswitch/util.h"
+
+/* Note:
+ * umem_elem_push* shouldn't overflow because we always pop
+ * elem first, then push back to the stack.
+ */
+static inline void
+__umem_elem_push_n(struct umem_pool *umemp, int n, void **addrs)
+{
+ void *ptr;
+
+ ovs_assert(umemp->index + n <= umemp->size);
+
+ ptr = &umemp->array[umemp->index];
+ memcpy(ptr, addrs, n * sizeof(void *));
+ umemp->index += n;
+}
+
+void umem_elem_push_n(struct umem_pool *umemp, int n, void **addrs)
+{
+ ovs_spin_lock(&umemp->lock);
+ __umem_elem_push_n(umemp, n, addrs);
+ ovs_spin_unlock(&umemp->lock);
+}
+
+static inline void
+__umem_elem_push(struct umem_pool *umemp, void *addr)
+{
+ ovs_assert(umemp->index + 1 <= umemp->size);
+
+ umemp->array[umemp->index++] = addr;
+}
+
+void
+umem_elem_push(struct umem_pool *umemp, void *addr)
+{
+ ovs_spin_lock(&umemp->lock);
+ __umem_elem_push(umemp, addr);
+ ovs_spin_unlock(&umemp->lock);
+}
+
+static inline int
+__umem_elem_pop_n(struct umem_pool *umemp, int n, void **addrs)
+{
+ void *ptr;
+
+ if (OVS_UNLIKELY(umemp->index - n < 0)) {
+ return -ENOMEM;
+ }
+
+ umemp->index -= n;
+ ptr = &umemp->array[umemp->index];
+ memcpy(addrs, ptr, n * sizeof(void *));
+
+ return 0;
+}
+
+int
+umem_elem_pop_n(struct umem_pool *umemp, int n, void **addrs)
+{
+ int ret;
+
+ ovs_spin_lock(&umemp->lock);
+ ret = __umem_elem_pop_n(umemp, n, addrs);
+ ovs_spin_unlock(&umemp->lock);
+
+ return ret;
+}
+
+static inline void *
+__umem_elem_pop(struct umem_pool *umemp)
+{
+ if (OVS_UNLIKELY(umemp->index - 1 < 0)) {
+ return NULL;
+ }
+
+ return umemp->array[--umemp->index];
+}
+
+void *
+umem_elem_pop(struct umem_pool *umemp)
+{
+ void *ptr;
+
+ ovs_spin_lock(&umemp->lock);
+ ptr = __umem_elem_pop(umemp);
+ ovs_spin_unlock(&umemp->lock);
+
+ return ptr;
+}
+
+static void **
+__umem_pool_alloc(unsigned int size)
+{
+ void **bufs;
+
+ bufs = xmalloc_pagealign(size * sizeof *bufs);
+ memset(bufs, 0, size * sizeof *bufs);
+
+ return bufs;
+}
+
+int
+umem_pool_init(struct umem_pool *umemp, unsigned int size)
+{
+ umemp->array = __umem_pool_alloc(size);
+ if (!umemp->array) {
+ return -ENOMEM;
+ }
+
+ umemp->size = size;
+ umemp->index = 0;
+ ovs_spin_init(&umemp->lock);
+ return 0;
+}
+
+void
+umem_pool_cleanup(struct umem_pool *umemp)
+{
+ free_pagealign(umemp->array);
+ umemp->array = NULL;
+ ovs_spin_destroy(&umemp->lock);
+}
+
+unsigned int
+umem_pool_count(struct umem_pool *umemp)
+{
+ return umemp->index;
+}
+
+/* AF_XDP metadata init/destroy. */
+int
+xpacket_pool_init(struct xpacket_pool *xp, unsigned int size)
+{
+ xp->array = xmalloc_pagealign(size * sizeof *xp->array);
+ xp->size = size;
+
+ memset(xp->array, 0, size * sizeof *xp->array);
+
+ return 0;
+}
+
+void
+xpacket_pool_cleanup(struct xpacket_pool *xp)
+{
+ free_pagealign(xp->array);
+ xp->array = NULL;
+}
new file mode 100644
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2018, 2019 Nicira, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef XDPSOCK_H
+#define XDPSOCK_H 1
+
+#include <config.h>
+
+#ifdef HAVE_AF_XDP
+
+#include <bpf/xsk.h>
+#include <errno.h>
+#include <stdbool.h>
+
+#include "openvswitch/thread.h"
+#include "ovs-atomic.h"
+
+/* LIFO ptr_array. */
+struct umem_pool {
+ int index; /* Point to top. */
+ unsigned int size;
+ struct ovs_spin lock;
+ void **array; /* A pointer array pointing to umem buf. */
+};
+
+/* Array-based dp_packet_afxdp. */
+struct xpacket_pool {
+ unsigned int size;
+ struct dp_packet_afxdp *array;
+};
+
+void umem_elem_push(struct umem_pool *umemp, void *addr);
+void umem_elem_push_n(struct umem_pool *umemp, int n, void **addrs);
+
+void *umem_elem_pop(struct umem_pool *umemp);
+int umem_elem_pop_n(struct umem_pool *umemp, int n, void **addrs);
+
+int umem_pool_init(struct umem_pool *umemp, unsigned int size);
+void umem_pool_cleanup(struct umem_pool *umemp);
+unsigned int umem_pool_count(struct umem_pool *umemp);
+int xpacket_pool_init(struct xpacket_pool *xp, unsigned int size);
+void xpacket_pool_cleanup(struct xpacket_pool *xp);
+
+#endif
+#endif
new file mode 100644
@@ -0,0 +1,1041 @@
+/*
+ * Copyright (c) 2018, 2019 Nicira, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <config.h>
+
+#include "netdev-linux-private.h"
+#include "netdev-linux.h"
+#include "netdev-afxdp.h"
+#include "netdev-afxdp-pool.h"
+
+#include <errno.h>
+#include <inttypes.h>
+#include <linux/rtnetlink.h>
+#include <linux/if_xdp.h>
+#include <net/if.h>
+#include <stdlib.h>
+#include <sys/resource.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "coverage.h"
+#include "dp-packet.h"
+#include "dpif-netdev.h"
+#include "fatal-signal.h"
+#include "openvswitch/compiler.h"
+#include "openvswitch/dynamic-string.h"
+#include "openvswitch/list.h"
+#include "openvswitch/vlog.h"
+#include "packets.h"
+#include "socket-util.h"
+#include "util.h"
+
+#ifndef SOL_XDP
+#define SOL_XDP 283
+#endif
+
+COVERAGE_DEFINE(afxdp_cq_empty);
+COVERAGE_DEFINE(afxdp_fq_full);
+COVERAGE_DEFINE(afxdp_tx_full);
+COVERAGE_DEFINE(afxdp_cq_skip);
+
+VLOG_DEFINE_THIS_MODULE(netdev_afxdp);
+
+static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
+
+#define MAX_XSKQ 16
+#define FRAME_HEADROOM XDP_PACKET_HEADROOM
+#define OVS_XDP_HEADROOM 128
+#define FRAME_SIZE XSK_UMEM__DEFAULT_FRAME_SIZE
+#define FRAME_SHIFT XSK_UMEM__DEFAULT_FRAME_SHIFT
+#define FRAME_SHIFT_MASK ((1 << FRAME_SHIFT) - 1)
+
+#define PROD_NUM_DESCS XSK_RING_PROD__DEFAULT_NUM_DESCS
+#define CONS_NUM_DESCS XSK_RING_CONS__DEFAULT_NUM_DESCS
+
+/* The worst case is all 4 queues TX/CQ/RX/FILL are full + some packets
+ * still on processing in threads. Number of packets currently in OVS
+ * processing is hard to estimate because it depends on number of ports.
+ * Setting NUM_FRAMES twice as large than total of ring sizes should be
+ * enough for most corner cases.
+ */
+#define NUM_FRAMES (4 * (PROD_NUM_DESCS + CONS_NUM_DESCS))
+#define BATCH_SIZE NETDEV_MAX_BURST
+
+BUILD_ASSERT_DECL(IS_POW2(NUM_FRAMES));
+BUILD_ASSERT_DECL(PROD_NUM_DESCS == CONS_NUM_DESCS);
+
+#define UMEM2DESC(elem, base) ((uint64_t)((char *)elem - (char *)base))
+
+static struct xsk_socket_info *xsk_configure(int ifindex, int xdp_queue_id,
+ int mode);
+static void xsk_remove_xdp_program(uint32_t ifindex, int xdpmode);
+static void xsk_destroy(struct xsk_socket_info *xsk);
+static int xsk_configure_all(struct netdev *netdev);
+static void xsk_destroy_all(struct netdev *netdev);
+
+struct unused_pool {
+ struct xsk_umem_info *umem_info;
+ int lost_in_rings; /* Number of packets left in tx, rx, cq and fq. */
+ struct ovs_list list_node;
+};
+
+static struct ovs_mutex unused_pools_mutex = OVS_MUTEX_INITIALIZER;
+static struct ovs_list unused_pools OVS_GUARDED_BY(unused_pools_mutex) =
+ OVS_LIST_INITIALIZER(&unused_pools);
+
+struct xsk_umem_info {
+ struct umem_pool mpool;
+ struct xpacket_pool xpool;
+ struct xsk_ring_prod fq;
+ struct xsk_ring_cons cq;
+ struct xsk_umem *umem;
+ void *buffer;
+};
+
+struct xsk_socket_info {
+ struct xsk_ring_cons rx;
+ struct xsk_ring_prod tx;
+ struct xsk_umem_info *umem;
+ struct xsk_socket *xsk;
+ uint32_t outstanding_tx; /* Number of descriptors filled in tx and cq. */
+ uint32_t available_rx; /* Number of descriptors filled in rx and fq. */
+ atomic_uint64_t tx_dropped;
+};
+
+static void
+netdev_afxdp_cleanup_unused_pool(struct unused_pool *pool)
+{
+ /* free the packet buffer */
+ free_pagealign(pool->umem_info->buffer);
+
+ /* cleanup umem pool */
+ umem_pool_cleanup(&pool->umem_info->mpool);
+
+ /* cleanup metadata pool */
+ xpacket_pool_cleanup(&pool->umem_info->xpool);
+
+ free(pool->umem_info);
+}
+
+static void
+netdev_afxdp_sweep_unused_pools(void *aux OVS_UNUSED)
+{
+ struct unused_pool *pool, *next;
+ unsigned int count;
+
+ ovs_mutex_lock(&unused_pools_mutex);
+ LIST_FOR_EACH_SAFE (pool, next, list_node, &unused_pools) {
+
+ count = umem_pool_count(&pool->umem_info->mpool);
+ ovs_assert(count + pool->lost_in_rings <= NUM_FRAMES);
+
+ if (count + pool->lost_in_rings == NUM_FRAMES) {
+ /* OVS doesn't use this memory pool anymore. Kernel doesn't
+ * use it since closing the xdp socket. So, it's safe to free
+ * the pool now. */
+ VLOG_DBG("Freeing umem pool at 0x%"PRIxPTR,
+ (uintptr_t) pool->umem_info);
+ ovs_list_remove(&pool->list_node);
+ netdev_afxdp_cleanup_unused_pool(pool);
+ free(pool);
+ }
+ }
+ ovs_mutex_unlock(&unused_pools_mutex);
+}
+
+static struct xsk_umem_info *
+xsk_configure_umem(void *buffer, uint64_t size, int xdpmode)
+{
+ struct xsk_umem_config uconfig;
+ struct xsk_umem_info *umem;
+ int ret;
+ int i;
+
+ umem = xzalloc(sizeof *umem);
+
+ uconfig.fill_size = PROD_NUM_DESCS;
+ uconfig.comp_size = CONS_NUM_DESCS;
+ uconfig.frame_size = FRAME_SIZE;
+ uconfig.frame_headroom = OVS_XDP_HEADROOM;
+
+ ret = xsk_umem__create(&umem->umem, buffer, size, &umem->fq, &umem->cq,
+ &uconfig);
+ if (ret) {
+ VLOG_ERR("xsk_umem__create failed (%s) mode: %s",
+ ovs_strerror(errno),
+ xdpmode == XDP_COPY ? "SKB": "DRV");
+ free(umem);
+ return NULL;
+ }
+
+ umem->buffer = buffer;
+
+ /* Set-up umem pool. */
+ if (umem_pool_init(&umem->mpool, NUM_FRAMES) < 0) {
+ VLOG_ERR("umem_pool_init failed");
+ if (xsk_umem__delete(umem->umem)) {
+ VLOG_ERR("xsk_umem__delete failed");
+ }
+ free(umem);
+ return NULL;
+ }
+
+ for (i = NUM_FRAMES - 1; i >= 0; i--) {
+ void *elem;
+
+ elem = ALIGNED_CAST(void *, (char *)umem->buffer + i * FRAME_SIZE);
+ umem_elem_push(&umem->mpool, elem);
+ }
+
+ /* Set-up metadata. */
+ if (xpacket_pool_init(&umem->xpool, NUM_FRAMES) < 0) {
+ VLOG_ERR("xpacket_pool_init failed");
+ umem_pool_cleanup(&umem->mpool);
+ if (xsk_umem__delete(umem->umem)) {
+ VLOG_ERR("xsk_umem__delete failed");
+ }
+ free(umem);
+ return NULL;
+ }
+
+ VLOG_DBG("%s: xpacket pool from %p to %p", __func__,
+ umem->xpool.array,
+ (char *)umem->xpool.array +
+ NUM_FRAMES * sizeof(struct dp_packet_afxdp));
+
+ for (i = NUM_FRAMES - 1; i >= 0; i--) {
+ struct dp_packet_afxdp *xpacket;
+ struct dp_packet *packet;
+
+ xpacket = &umem->xpool.array[i];
+ xpacket->mpool = &umem->mpool;
+
+ packet = &xpacket->packet;
+ packet->source = DPBUF_AFXDP;
+ }
+
+ return umem;
+}
+
+static struct xsk_socket_info *
+xsk_configure_socket(struct xsk_umem_info *umem, uint32_t ifindex,
+ uint32_t queue_id, int xdpmode)
+{
+ struct xsk_socket_config cfg;
+ struct xsk_socket_info *xsk;
+ char devname[IF_NAMESIZE];
+ uint32_t idx = 0, prog_id;
+ int ret;
+ int i;
+
+ xsk = xzalloc(sizeof *xsk);
+ xsk->umem = umem;
+ cfg.rx_size = CONS_NUM_DESCS;
+ cfg.tx_size = PROD_NUM_DESCS;
+ cfg.libbpf_flags = 0;
+
+ if (xdpmode == XDP_ZEROCOPY) {
+ cfg.bind_flags = XDP_ZEROCOPY;
+ cfg.xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST | XDP_FLAGS_DRV_MODE;
+ } else {
+ cfg.bind_flags = XDP_COPY;
+ cfg.xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST | XDP_FLAGS_SKB_MODE;
+ }
+
+ if (if_indextoname(ifindex, devname) == NULL) {
+ VLOG_ERR("ifindex %d to devname failed (%s)",
+ ifindex, ovs_strerror(errno));
+ free(xsk);
+ return NULL;
+ }
+
+ ret = xsk_socket__create(&xsk->xsk, devname, queue_id, umem->umem,
+ &xsk->rx, &xsk->tx, &cfg);
+ if (ret) {
+ VLOG_ERR("xsk_socket__create failed (%s) mode: %s qid: %d",
+ ovs_strerror(errno),
+ xdpmode == XDP_COPY ? "SKB": "DRV",
+ queue_id);
+ free(xsk);
+ return NULL;
+ }
+
+ /* Make sure the built-in AF_XDP program is loaded. */
+ ret = bpf_get_link_xdp_id(ifindex, &prog_id, cfg.xdp_flags);
+ if (ret) {
+ VLOG_ERR("Get XDP prog ID failed (%s)", ovs_strerror(errno));
+ xsk_socket__delete(xsk->xsk);
+ free(xsk);
+ return NULL;
+ }
+
+ while (!xsk_ring_prod__reserve(&xsk->umem->fq,
+ PROD_NUM_DESCS, &idx)) {
+ VLOG_WARN_RL(&rl, "Retry xsk_ring_prod__reserve to FILL queue");
+ }
+
+ for (i = 0;
+ i < PROD_NUM_DESCS * FRAME_SIZE;
+ i += FRAME_SIZE) {
+ void *elem;
+ uint64_t addr;
+
+ elem = umem_elem_pop(&xsk->umem->mpool);
+ addr = UMEM2DESC(elem, xsk->umem->buffer);
+
+ *xsk_ring_prod__fill_addr(&xsk->umem->fq, idx++) = addr;
+ }
+
+ xsk_ring_prod__submit(&xsk->umem->fq,
+ PROD_NUM_DESCS);
+ return xsk;
+}
+
+static struct xsk_socket_info *
+xsk_configure(int ifindex, int xdp_queue_id, int xdpmode)
+{
+ struct xsk_socket_info *xsk;
+ struct xsk_umem_info *umem;
+ void *bufs;
+
+ netdev_afxdp_sweep_unused_pools(NULL);
+
+ /* Umem memory region. */
+ bufs = xmalloc_pagealign(NUM_FRAMES * FRAME_SIZE);
+ memset(bufs, 0, NUM_FRAMES * FRAME_SIZE);
+
+ /* Create AF_XDP socket. */
+ umem = xsk_configure_umem(bufs,
+ NUM_FRAMES * FRAME_SIZE,
+ xdpmode);
+ if (!umem) {
+ free_pagealign(bufs);
+ return NULL;
+ }
+
+ VLOG_DBG("Allocated umem pool at 0x%"PRIxPTR, (uintptr_t) umem);
+
+ xsk = xsk_configure_socket(umem, ifindex, xdp_queue_id, xdpmode);
+ if (!xsk) {
+ /* Clean up umem and xpacket pool. */
+ if (xsk_umem__delete(umem->umem)) {
+ VLOG_ERR("xsk_umem__delete failed.");
+ }
+ free_pagealign(bufs);
+ umem_pool_cleanup(&umem->mpool);
+ xpacket_pool_cleanup(&umem->xpool);
+ free(umem);
+ }
+ return xsk;
+}
+
+static int
+xsk_configure_all(struct netdev *netdev)
+{
+ struct netdev_linux *dev = netdev_linux_cast(netdev);
+ struct xsk_socket_info *xsk_info;
+ int i, ifindex, n_rxq, n_txq;
+
+ ifindex = linux_get_ifindex(netdev_get_name(netdev));
+
+ ovs_assert(dev->xsks == NULL);
+ ovs_assert(dev->tx_locks == NULL);
+
+ n_rxq = netdev_n_rxq(netdev);
+ dev->xsks = xcalloc(n_rxq, sizeof *dev->xsks);
+
+ /* Configure each queue. */
+ for (i = 0; i < n_rxq; i++) {
+ VLOG_INFO("%s: configure queue %d mode %s", __func__, i,
+ dev->xdpmode == XDP_COPY ? "SKB" : "DRV");
+ xsk_info = xsk_configure(ifindex, i, dev->xdpmode);
+ if (!xsk_info) {
+ VLOG_ERR("Failed to create AF_XDP socket on queue %d.", i);
+ dev->xsks[i] = NULL;
+ goto err;
+ }
+ dev->xsks[i] = xsk_info;
+ atomic_init(&xsk_info->tx_dropped, 0);
+ xsk_info->outstanding_tx = 0;
+ xsk_info->available_rx = PROD_NUM_DESCS;
+ }
+
+ n_txq = netdev_n_txq(netdev);
+ dev->tx_locks = xcalloc(n_txq, sizeof *dev->tx_locks);
+
+ for (i = 0; i < n_txq; i++) {
+ ovs_spin_init(&dev->tx_locks[i]);
+ }
+
+ return 0;
+
+err:
+ xsk_destroy_all(netdev);
+ return EINVAL;
+}
+
+static void
+xsk_destroy(struct xsk_socket_info *xsk_info)
+{
+ struct xsk_umem *umem;
+ struct unused_pool *pool;
+
+ xsk_socket__delete(xsk_info->xsk);
+ xsk_info->xsk = NULL;
+
+ umem = xsk_info->umem->umem;
+ if (xsk_umem__delete(umem)) {
+ VLOG_ERR("xsk_umem__delete failed.");
+ }
+
+ pool = xzalloc(sizeof *pool);
+ pool->umem_info = xsk_info->umem;
+ pool->lost_in_rings = xsk_info->outstanding_tx + xsk_info->available_rx;
+
+ ovs_mutex_lock(&unused_pools_mutex);
+ ovs_list_push_back(&unused_pools, &pool->list_node);
+ ovs_mutex_unlock(&unused_pools_mutex);
+
+ free(xsk_info);
+
+ netdev_afxdp_sweep_unused_pools(NULL);
+}
+
+static void
+xsk_destroy_all(struct netdev *netdev)
+{
+ struct netdev_linux *dev = netdev_linux_cast(netdev);
+ int i, ifindex;
+
+ if (dev->xsks) {
+ for (i = 0; i < netdev_n_rxq(netdev); i++) {
+ if (dev->xsks[i]) {
+ xsk_destroy(dev->xsks[i]);
+ dev->xsks[i] = NULL;
+ VLOG_INFO("Destroyed xsk[%d].", i);
+ }
+ }
+
+ free(dev->xsks);
+ dev->xsks = NULL;
+ }
+
+ VLOG_INFO("%s: Removing xdp program.", netdev_get_name(netdev));
+ ifindex = linux_get_ifindex(netdev_get_name(netdev));
+ xsk_remove_xdp_program(ifindex, dev->xdpmode);
+
+ if (dev->tx_locks) {
+ for (i = 0; i < netdev_n_txq(netdev); i++) {
+ ovs_spin_destroy(&dev->tx_locks[i]);
+ }
+ free(dev->tx_locks);
+ dev->tx_locks = NULL;
+ }
+}
+
+static inline void OVS_UNUSED
+log_xsk_stat(struct xsk_socket_info *xsk OVS_UNUSED) {
+ struct xdp_statistics stat;
+ socklen_t optlen;
+
+ optlen = sizeof stat;
+ ovs_assert(getsockopt(xsk_socket__fd(xsk->xsk), SOL_XDP, XDP_STATISTICS,
+ &stat, &optlen) == 0);
+
+ VLOG_DBG_RL(&rl, "rx dropped %llu, rx_invalid %llu, tx_invalid %llu",
+ stat.rx_dropped,
+ stat.rx_invalid_descs,
+ stat.tx_invalid_descs);
+}
+
+int
+netdev_afxdp_set_config(struct netdev *netdev, const struct smap *args,
+ char **errp OVS_UNUSED)
+{
+ struct netdev_linux *dev = netdev_linux_cast(netdev);
+ const char *str_xdpmode;
+ int xdpmode, new_n_rxq;
+
+ ovs_mutex_lock(&dev->mutex);
+ new_n_rxq = MAX(smap_get_int(args, "n_rxq", NR_QUEUE), 1);
+ if (new_n_rxq > MAX_XSKQ) {
+ ovs_mutex_unlock(&dev->mutex);
+ VLOG_ERR("%s: Too big 'n_rxq' (%d > %d).",
+ netdev_get_name(netdev), new_n_rxq, MAX_XSKQ);
+ return EINVAL;
+ }
+
+ str_xdpmode = smap_get_def(args, "xdpmode", "skb");
+ if (!strcasecmp(str_xdpmode, "drv")) {
+ xdpmode = XDP_ZEROCOPY;
+ } else if (!strcasecmp(str_xdpmode, "skb")) {
+ xdpmode = XDP_COPY;
+ } else {
+ VLOG_ERR("%s: Incorrect xdpmode (%s).",
+ netdev_get_name(netdev), str_xdpmode);
+ ovs_mutex_unlock(&dev->mutex);
+ return EINVAL;
+ }
+
+ if (dev->requested_n_rxq != new_n_rxq
+ || dev->requested_xdpmode != xdpmode) {
+ dev->requested_n_rxq = new_n_rxq;
+ dev->requested_xdpmode = xdpmode;
+ netdev_request_reconfigure(netdev);
+ }
+ ovs_mutex_unlock(&dev->mutex);
+ return 0;
+}
+
+int
+netdev_afxdp_get_config(const struct netdev *netdev, struct smap *args)
+{
+ struct netdev_linux *dev = netdev_linux_cast(netdev);
+
+ ovs_mutex_lock(&dev->mutex);
+ smap_add_format(args, "n_rxq", "%d", netdev->n_rxq);
+ smap_add_format(args, "xdpmode", "%s",
+ dev->xdpmode == XDP_ZEROCOPY ? "drv" : "skb");
+ ovs_mutex_unlock(&dev->mutex);
+ return 0;
+}
+
+int
+netdev_afxdp_reconfigure(struct netdev *netdev)
+{
+ struct netdev_linux *dev = netdev_linux_cast(netdev);
+ struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+ int err = 0;
+
+ ovs_mutex_lock(&dev->mutex);
+
+ if (netdev->n_rxq == dev->requested_n_rxq
+ && dev->xdpmode == dev->requested_xdpmode) {
+ goto out;
+ }
+
+ xsk_destroy_all(netdev);
+
+ netdev->n_rxq = dev->requested_n_rxq;
+ netdev->n_txq = netdev->n_rxq;
+
+ if (dev->requested_xdpmode == XDP_ZEROCOPY) {
+ dev->xdpmode = XDP_ZEROCOPY;
+ VLOG_INFO("AF_XDP device %s in DRV mode.", netdev_get_name(netdev));
+ if (setrlimit(RLIMIT_MEMLOCK, &r)) {
+ VLOG_ERR("ERROR: setrlimit(RLIMIT_MEMLOCK): %s",
+ ovs_strerror(errno));
+ }
+ } else {
+ dev->xdpmode = XDP_COPY;
+ VLOG_INFO("AF_XDP device %s in SKB mode.", netdev_get_name(netdev));
+ /* TODO: set rlimit back to previous value
+ * when no device is in DRV mode.
+ */
+ }
+
+ err = xsk_configure_all(netdev);
+ if (err) {
+ VLOG_ERR("AF_XDP device %s reconfig failed.", netdev_get_name(netdev));
+ }
+ netdev_change_seq_changed(netdev);
+out:
+ ovs_mutex_unlock(&dev->mutex);
+ return err;
+}
+
+int
+netdev_afxdp_get_numa_id(const struct netdev *netdev)
+{
+ /* FIXME: Get netdev's PCIe device ID, then find
+ * its NUMA node id.
+ */
+ VLOG_INFO("FIXME: Device %s always use numa id 0.",
+ netdev_get_name(netdev));
+ return 0;
+}
+
+static void
+xsk_remove_xdp_program(uint32_t ifindex, int xdpmode)
+{
+ uint32_t flags;
+
+ flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
+
+ if (xdpmode == XDP_COPY) {
+ flags |= XDP_FLAGS_SKB_MODE;
+ } else if (xdpmode == XDP_ZEROCOPY) {
+ flags |= XDP_FLAGS_DRV_MODE;
+ }
+
+ bpf_set_link_xdp_fd(ifindex, -1, flags);
+}
+
+void
+signal_remove_xdp(struct netdev *netdev)
+{
+ struct netdev_linux *dev = netdev_linux_cast(netdev);
+ int ifindex;
+
+ ifindex = linux_get_ifindex(netdev_get_name(netdev));
+
+ VLOG_WARN("Force removing xdp program.");
+ xsk_remove_xdp_program(ifindex, dev->xdpmode);
+}
+
+static struct dp_packet_afxdp *
+dp_packet_cast_afxdp(const struct dp_packet *d)
+{
+ ovs_assert(d->source == DPBUF_AFXDP);
+ return CONTAINER_OF(d, struct dp_packet_afxdp, packet);
+}
+
+static inline void
+prepare_fill_queue(struct xsk_socket_info *xsk_info)
+{
+ struct xsk_umem_info *umem;
+ void *elems[BATCH_SIZE];
+ unsigned int idx_fq;
+ int i, ret;
+
+ umem = xsk_info->umem;
+
+ if (xsk_prod_nb_free(&umem->fq, BATCH_SIZE) < BATCH_SIZE) {
+ return;
+ }
+
+ ret = umem_elem_pop_n(&umem->mpool, BATCH_SIZE, elems);
+ if (OVS_UNLIKELY(ret)) {
+ return;
+ }
+
+ if (!xsk_ring_prod__reserve(&umem->fq, BATCH_SIZE, &idx_fq)) {
+ umem_elem_push_n(&umem->mpool, BATCH_SIZE, elems);
+ COVERAGE_INC(afxdp_fq_full);
+ return;
+ }
+
+ for (i = 0; i < BATCH_SIZE; i++) {
+ uint64_t index;
+ void *elem;
+
+ elem = elems[i];
+ index = (uint64_t)((char *)elem - (char *)umem->buffer);
+ ovs_assert((index & FRAME_SHIFT_MASK) == 0);
+ *xsk_ring_prod__fill_addr(&umem->fq, idx_fq) = index;
+
+ idx_fq++;
+ }
+ xsk_ring_prod__submit(&umem->fq, BATCH_SIZE);
+ xsk_info->available_rx += BATCH_SIZE;
+}
+
+int
+netdev_afxdp_rxq_recv(struct netdev_rxq *rxq_, struct dp_packet_batch *batch,
+ int *qfill)
+{
+ struct netdev_rxq_linux *rx = netdev_rxq_linux_cast(rxq_);
+ struct netdev *netdev = rx->up.netdev;
+ struct netdev_linux *dev = netdev_linux_cast(netdev);
+ struct xsk_socket_info *xsk_info;
+ struct xsk_umem_info *umem;
+ uint32_t idx_rx = 0;
+ int qid = rxq_->queue_id;
+ unsigned int rcvd, i;
+
+ xsk_info = dev->xsks[qid];
+ if (!xsk_info || !xsk_info->xsk) {
+ return EAGAIN;
+ }
+
+ prepare_fill_queue(xsk_info);
+
+ umem = xsk_info->umem;
+ rx->fd = xsk_socket__fd(xsk_info->xsk);
+
+ rcvd = xsk_ring_cons__peek(&xsk_info->rx, BATCH_SIZE, &idx_rx);
+ if (!rcvd) {
+ return EAGAIN;
+ }
+
+ /* Setup a dp_packet batch from descriptors in RX queue. */
+ for (i = 0; i < rcvd; i++) {
+ struct dp_packet_afxdp *xpacket;
+ const struct xdp_desc *desc;
+ struct dp_packet *packet;
+ uint64_t addr, index;
+ uint32_t len;
+ char *pkt;
+
+ desc = xsk_ring_cons__rx_desc(&xsk_info->rx, idx_rx);
+ addr = desc->addr;
+ len = desc->len;
+
+ pkt = xsk_umem__get_data(umem->buffer, addr);
+ index = addr >> FRAME_SHIFT;
+ xpacket = &umem->xpool.array[index];
+ packet = &xpacket->packet;
+
+ /* Initialize the struct dp_packet. */
+ dp_packet_use_afxdp(packet, pkt,
+ FRAME_SIZE - FRAME_HEADROOM,
+ OVS_XDP_HEADROOM);
+ dp_packet_set_size(packet, len);
+
+ /* Add packet into batch, increase batch->count. */
+ dp_packet_batch_add(batch, packet);
+
+ idx_rx++;
+ }
+ /* Release the RX queue. */
+ xsk_ring_cons__release(&xsk_info->rx, rcvd);
+ xsk_info->available_rx -= rcvd;
+
+ if (qfill) {
+ /* TODO: return the number of remaining packets in the queue. */
+ *qfill = 0;
+ }
+
+#ifdef AFXDP_DEBUG
+ log_xsk_stat(xsk_info);
+#endif
+ return 0;
+}
+
+static inline int
+kick_tx(struct xsk_socket_info *xsk_info, int xdpmode)
+{
+ int ret, retries;
+ static const int KERNEL_TX_BATCH_SIZE = 16;
+
+ /* In SKB_MODE packet transmission is synchronous, and the kernel xmits
+ * only TX_BATCH_SIZE(16) packets for a single sendmsg syscall.
+ * So, we have to kick the kernel (n_packets / 16) times to be sure that
+ * all packets are transmitted. */
+ retries = (xdpmode == XDP_COPY)
+ ? xsk_info->outstanding_tx / KERNEL_TX_BATCH_SIZE
+ : 0;
+kick_retry:
+ /* This causes system call into kernel's xsk_sendmsg, and
+ * xsk_generic_xmit (skb mode) or xsk_async_xmit (driver mode).
+ */
+ ret = sendto(xsk_socket__fd(xsk_info->xsk), NULL, 0, MSG_DONTWAIT,
+ NULL, 0);
+ if (ret < 0) {
+ if (retries-- && errno == EAGAIN) {
+ goto kick_retry;
+ }
+ if (errno == ENXIO || errno == ENOBUFS || errno == EOPNOTSUPP) {
+ return errno;
+ }
+ }
+ /* No error, or EBUSY, or too many retries on EAGAIN. */
+ return 0;
+}
+
+void
+free_afxdp_buf(struct dp_packet *p)
+{
+ struct dp_packet_afxdp *xpacket;
+ uintptr_t addr;
+
+ xpacket = dp_packet_cast_afxdp(p);
+ if (xpacket->mpool) {
+ void *base = dp_packet_base(p);
+
+ addr = (uintptr_t)base & (~FRAME_SHIFT_MASK);
+ umem_elem_push(xpacket->mpool, (void *)addr);
+ }
+}
+
+static void
+free_afxdp_buf_batch(struct dp_packet_batch *batch)
+{
+ struct dp_packet_afxdp *xpacket = NULL;
+ struct dp_packet *packet;
+ void *elems[BATCH_SIZE];
+ uintptr_t addr;
+
+ DP_PACKET_BATCH_FOR_EACH (i, packet, batch) {
+ void *base;
+
+ xpacket = dp_packet_cast_afxdp(packet);
+ base = dp_packet_base(packet);
+ addr = (uintptr_t)base & (~FRAME_SHIFT_MASK);
+ elems[i] = (void *)addr;
+ }
+ umem_elem_push_n(xpacket->mpool, batch->count, elems);
+ dp_packet_batch_init(batch);
+}
+
+static inline bool
+check_free_batch(struct dp_packet_batch *batch)
+{
+ struct umem_pool *first_mpool = NULL;
+ struct dp_packet_afxdp *xpacket;
+ struct dp_packet *packet;
+
+ DP_PACKET_BATCH_FOR_EACH (i, packet, batch) {
+ if (packet->source != DPBUF_AFXDP) {
+ return false;
+ }
+ xpacket = dp_packet_cast_afxdp(packet);
+ if (i == 0) {
+ first_mpool = xpacket->mpool;
+ continue;
+ }
+ if (xpacket->mpool != first_mpool) {
+ return false;
+ }
+ }
+ /* All packets are DPBUF_AFXDP and from the same mpool. */
+ return true;
+}
+
+static inline void
+afxdp_complete_tx(struct xsk_socket_info *xsk_info)
+{
+ void *elems_push[BATCH_SIZE];
+ struct xsk_umem_info *umem;
+ uint32_t idx_cq = 0;
+ int tx_to_free = 0;
+ int tx_done, j;
+
+ umem = xsk_info->umem;
+ tx_done = xsk_ring_cons__peek(&umem->cq, CONS_NUM_DESCS, &idx_cq);
+
+ /* Recycle back to umem pool. */
+ for (j = 0; j < tx_done; j++) {
+ uint64_t *addr;
+ void *elem;
+
+ addr = (uint64_t *)xsk_ring_cons__comp_addr(&umem->cq, idx_cq++);
+ if (*addr == UINT64_MAX) {
+ /* The elem has been pushed already. */
+ COVERAGE_INC(afxdp_cq_skip);
+ continue;
+ }
+ elem = ALIGNED_CAST(void *, (char *)umem->buffer + *addr);
+ elems_push[tx_to_free] = elem;
+ *addr = UINT64_MAX; /* Mark as pushed. */
+ tx_to_free++;
+
+ if (tx_to_free == BATCH_SIZE || j == tx_done - 1) {
+ umem_elem_push_n(&umem->mpool, tx_to_free, elems_push);
+ xsk_info->outstanding_tx -= tx_to_free;
+ tx_to_free = 0;
+ }
+ }
+
+ if (tx_done > 0) {
+ xsk_ring_cons__release(&umem->cq, tx_done);
+ } else {
+ COVERAGE_INC(afxdp_cq_empty);
+ }
+}
+
+static inline int
+__netdev_afxdp_batch_send(struct netdev *netdev, int qid,
+ struct dp_packet_batch *batch)
+{
+ struct netdev_linux *dev = netdev_linux_cast(netdev);
+ struct xsk_socket_info *xsk_info;
+ void *elems_pop[BATCH_SIZE];
+ struct xsk_umem_info *umem;
+ struct dp_packet *packet;
+ bool free_batch = false;
+ unsigned long orig;
+ uint32_t idx = 0;
+ int error = 0;
+ int ret;
+
+ xsk_info = dev->xsks[qid];
+ if (!xsk_info || !xsk_info->xsk) {
+ goto out;
+ }
+
+ afxdp_complete_tx(xsk_info);
+
+ free_batch = check_free_batch(batch);
+
+ umem = xsk_info->umem;
+ ret = umem_elem_pop_n(&umem->mpool, batch->count, elems_pop);
+ if (OVS_UNLIKELY(ret)) {
+ atomic_add_relaxed(&xsk_info->tx_dropped, batch->count, &orig);
+ VLOG_WARN_RL(&rl, "%s: send failed due to exhausted memory pool.",
+ netdev_get_name(netdev));
+ error = ENOMEM;
+ goto out;
+ }
+
+ /* Make sure we have enough TX descs. */
+ ret = xsk_ring_prod__reserve(&xsk_info->tx, batch->count, &idx);
+ if (OVS_UNLIKELY(ret == 0)) {
+ umem_elem_push_n(&umem->mpool, batch->count, elems_pop);
+ atomic_add_relaxed(&xsk_info->tx_dropped, batch->count, &orig);
+ COVERAGE_INC(afxdp_tx_full);
+ afxdp_complete_tx(xsk_info);
+ kick_tx(xsk_info, dev->xdpmode);
+ error = ENOMEM;
+ goto out;
+ }
+
+ DP_PACKET_BATCH_FOR_EACH (i, packet, batch) {
+ uint64_t index;
+ void *elem;
+
+ elem = elems_pop[i];
+ /* Copy the packet to the umem we just pop from umem pool.
+ * TODO: avoid this copy if the packet and the pop umem
+ * are located in the same umem.
+ */
+ memcpy(elem, dp_packet_data(packet), dp_packet_size(packet));
+
+ index = (uint64_t)((char *)elem - (char *)umem->buffer);
+ xsk_ring_prod__tx_desc(&xsk_info->tx, idx + i)->addr = index;
+ xsk_ring_prod__tx_desc(&xsk_info->tx, idx + i)->len
+ = dp_packet_size(packet);
+ }
+ xsk_ring_prod__submit(&xsk_info->tx, batch->count);
+ xsk_info->outstanding_tx += batch->count;
+
+ ret = kick_tx(xsk_info, dev->xdpmode);
+ if (OVS_UNLIKELY(ret)) {
+ VLOG_WARN_RL(&rl, "%s: error sending AF_XDP packet: %s.",
+ netdev_get_name(netdev), ovs_strerror(ret));
+ }
+
+out:
+ if (free_batch) {
+ free_afxdp_buf_batch(batch);
+ } else {
+ dp_packet_delete_batch(batch, true);
+ }
+
+ return error;
+}
+
+int
+netdev_afxdp_batch_send(struct netdev *netdev, int qid,
+ struct dp_packet_batch *batch,
+ bool concurrent_txq)
+{
+ struct netdev_linux *dev;
+ int ret;
+
+ if (concurrent_txq) {
+ dev = netdev_linux_cast(netdev);
+ qid = qid % netdev_n_txq(netdev);
+
+ ovs_spin_lock(&dev->tx_locks[qid]);
+ ret = __netdev_afxdp_batch_send(netdev, qid, batch);
+ ovs_spin_unlock(&dev->tx_locks[qid]);
+ } else {
+ ret = __netdev_afxdp_batch_send(netdev, qid, batch);
+ }
+
+ return ret;
+}
+
+int
+netdev_afxdp_rxq_construct(struct netdev_rxq *rxq_ OVS_UNUSED)
+{
+ /* Done at reconfigure. */
+ return 0;
+}
+
+void
+netdev_afxdp_rxq_destruct(struct netdev_rxq *rxq_ OVS_UNUSED)
+{
+ /* Nothing. */
+}
+
+void
+netdev_afxdp_destruct(struct netdev *netdev)
+{
+ static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
+ struct netdev_linux *dev = netdev_linux_cast(netdev);
+
+ if (ovsthread_once_start(&once)) {
+ fatal_signal_add_hook(netdev_afxdp_sweep_unused_pools,
+ NULL, NULL, true);
+ ovsthread_once_done(&once);
+ }
+
+ /* Note: tc is by-passed when using drv-mode, but when using
+ * skb-mode, we might need to clean up tc. */
+
+ xsk_destroy_all(netdev);
+ ovs_mutex_destroy(&dev->mutex);
+}
+
+int
+netdev_afxdp_get_stats(const struct netdev *netdev,
+ struct netdev_stats *stats)
+{
+ struct netdev_linux *dev = netdev_linux_cast(netdev);
+ struct xsk_socket_info *xsk_info;
+ struct netdev_stats dev_stats;
+ int error, i;
+
+ ovs_mutex_lock(&dev->mutex);
+
+ error = get_stats_via_netlink(netdev, &dev_stats);
+ if (error) {
+ VLOG_WARN_RL(&rl, "%s: Error getting AF_XDP statistics.",
+ netdev_get_name(netdev));
+ } else {
+ /* Use kernel netdev's packet and byte counts. */
+ stats->rx_packets = dev_stats.rx_packets;
+ stats->rx_bytes = dev_stats.rx_bytes;
+ stats->tx_packets = dev_stats.tx_packets;
+ stats->tx_bytes = dev_stats.tx_bytes;
+
+ stats->rx_errors += dev_stats.rx_errors;
+ stats->tx_errors += dev_stats.tx_errors;
+ stats->rx_dropped += dev_stats.rx_dropped;
+ stats->tx_dropped += dev_stats.tx_dropped;
+ stats->multicast += dev_stats.multicast;
+ stats->collisions += dev_stats.collisions;
+ stats->rx_length_errors += dev_stats.rx_length_errors;
+ stats->rx_over_errors += dev_stats.rx_over_errors;
+ stats->rx_crc_errors += dev_stats.rx_crc_errors;
+ stats->rx_frame_errors += dev_stats.rx_frame_errors;
+ stats->rx_fifo_errors += dev_stats.rx_fifo_errors;
+ stats->rx_missed_errors += dev_stats.rx_missed_errors;
+ stats->tx_aborted_errors += dev_stats.tx_aborted_errors;
+ stats->tx_carrier_errors += dev_stats.tx_carrier_errors;
+ stats->tx_fifo_errors += dev_stats.tx_fifo_errors;
+ stats->tx_heartbeat_errors += dev_stats.tx_heartbeat_errors;
+ stats->tx_window_errors += dev_stats.tx_window_errors;
+
+ /* Account the dropped in each xsk. */
+ for (i = 0; i < netdev_n_rxq(netdev); i++) {
+ xsk_info = dev->xsks[i];
+ if (xsk_info) {
+ uint64_t tx_dropped;
+
+ atomic_read_relaxed(&xsk_info->tx_dropped, &tx_dropped);
+ stats->tx_dropped += tx_dropped;
+ }
+ }
+ }
+ ovs_mutex_unlock(&dev->mutex);
+
+ return error;
+}
new file mode 100644
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2018, 2019 Nicira, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef NETDEV_AFXDP_H
+#define NETDEV_AFXDP_H 1
+
+#include <config.h>
+
+#ifdef HAVE_AF_XDP
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/* These functions are Linux AF_XDP specific, so they should be used directly
+ * only by Linux-specific code. */
+
+struct netdev;
+struct xsk_socket_info;
+struct xdp_umem;
+struct dp_packet_batch;
+struct smap;
+struct dp_packet;
+struct netdev_rxq;
+struct netdev_stats;
+
+int netdev_afxdp_rxq_construct(struct netdev_rxq *rxq_);
+void netdev_afxdp_rxq_destruct(struct netdev_rxq *rxq_);
+void netdev_afxdp_destruct(struct netdev *netdev_);
+
+int netdev_afxdp_rxq_recv(struct netdev_rxq *rxq_,
+ struct dp_packet_batch *batch,
+ int *qfill);
+int netdev_afxdp_batch_send(struct netdev *netdev_, int qid,
+ struct dp_packet_batch *batch,
+ bool concurrent_txq);
+int netdev_afxdp_set_config(struct netdev *netdev, const struct smap *args,
+ char **errp);
+int netdev_afxdp_get_config(const struct netdev *netdev, struct smap *args);
+int netdev_afxdp_get_numa_id(const struct netdev *netdev);
+int netdev_afxdp_get_stats(const struct netdev *netdev_,
+ struct netdev_stats *stats);
+
+void free_afxdp_buf(struct dp_packet *p);
+int netdev_afxdp_reconfigure(struct netdev *netdev);
+void signal_remove_xdp(struct netdev *netdev);
+
+#else /* !HAVE_AF_XDP */
+
+#include "openvswitch/compiler.h"
+
+struct dp_packet;
+
+static inline void
+free_afxdp_buf(struct dp_packet *p OVS_UNUSED)
+{
+ /* Nothing. */
+}
+
+#endif /* HAVE_AF_XDP */
+#endif /* netdev-afxdp.h */
new file mode 100644
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2019 Nicira, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef NETDEV_LINUX_PRIVATE_H
+#define NETDEV_LINUX_PRIVATE_H 1
+
+#include <config.h>
+
+#include <linux/filter.h>
+#include <linux/gen_stats.h>
+#include <linux/if_ether.h>
+#include <linux/if_tun.h>
+#include <linux/types.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "netdev-afxdp.h"
+#include "netdev-afxdp-pool.h"
+#include "netdev-provider.h"
+#include "netdev-vport.h"
+#include "openvswitch/thread.h"
+#include "ovs-atomic.h"
+#include "timer.h"
+
+struct netdev;
+
+struct netdev_rxq_linux {
+ struct netdev_rxq up;
+ bool is_tap;
+ int fd;
+};
+
+void netdev_linux_run(const struct netdev_class *);
+
+int get_stats_via_netlink(const struct netdev *netdev_,
+ struct netdev_stats *stats);
+
+struct netdev_linux {
+ struct netdev up;
+
+ /* Protects all members below. */
+ struct ovs_mutex mutex;
+
+ unsigned int cache_valid;
+
+ bool miimon; /* Link status of last poll. */
+ long long int miimon_interval; /* Miimon Poll rate. Disabled if <= 0. */
+ struct timer miimon_timer;
+
+ int netnsid; /* Network namespace ID. */
+ /* The following are figured out "on demand" only. They are only valid
+ * when the corresponding VALID_* bit in 'cache_valid' is set. */
+ int ifindex;
+ struct eth_addr etheraddr;
+ int mtu;
+ unsigned int ifi_flags;
+ long long int carrier_resets;
+ uint32_t kbits_rate; /* Policing data. */
+ uint32_t kbits_burst;
+ int vport_stats_error; /* Cached error code from vport_get_stats().
+ 0 or an errno value. */
+ int netdev_mtu_error; /* Cached error code from SIOCGIFMTU
+ * or SIOCSIFMTU.
+ */
+ int ether_addr_error; /* Cached error code from set/get etheraddr. */
+ int netdev_policing_error; /* Cached error code from set policing. */
+ int get_features_error; /* Cached error code from ETHTOOL_GSET. */
+ int get_ifindex_error; /* Cached error code from SIOCGIFINDEX. */
+
+ enum netdev_features current; /* Cached from ETHTOOL_GSET. */
+ enum netdev_features advertised; /* Cached from ETHTOOL_GSET. */
+ enum netdev_features supported; /* Cached from ETHTOOL_GSET. */
+
+ struct ethtool_drvinfo drvinfo; /* Cached from ETHTOOL_GDRVINFO. */
+ struct tc *tc;
+
+ /* For devices of class netdev_tap_class only. */
+ int tap_fd;
+ bool present; /* If the device is present in the namespace */
+ uint64_t tx_dropped; /* tap device can drop if the iface is down */
+
+ /* LAG information. */
+ bool is_lag_master; /* True if the netdev is a LAG master. */
+
+#ifdef HAVE_AF_XDP
+ /* AF_XDP information. */
+ struct xsk_socket_info **xsks;
+ int requested_n_rxq;
+ int xdpmode; /* AF_XDP running mode: driver or skb. */
+ int requested_xdpmode;
+ struct ovs_spin *tx_locks; /* spin lock array for TX queues. */
+#endif
+};
+
+static bool
+is_netdev_linux_class(const struct netdev_class *netdev_class)
+{
+ return netdev_class->run == netdev_linux_run;
+}
+
+static struct netdev_linux *
+netdev_linux_cast(const struct netdev *netdev)
+{
+ ovs_assert(is_netdev_linux_class(netdev_get_class(netdev)));
+
+ return CONTAINER_OF(netdev, struct netdev_linux, up);
+}
+
+static struct netdev_rxq_linux *
+netdev_rxq_linux_cast(const struct netdev_rxq *rx)
+{
+ ovs_assert(is_netdev_linux_class(netdev_get_class(rx->netdev)));
+
+ return CONTAINER_OF(rx, struct netdev_rxq_linux, up);
+}
+
+#endif /* netdev-linux-private.h */
@@ -17,6 +17,7 @@
#include <config.h>
#include "netdev-linux.h"
+#include "netdev-linux-private.h"
#include <errno.h>
#include <fcntl.h>
@@ -54,6 +55,7 @@
#include "fatal-signal.h"
#include "hash.h"
#include "openvswitch/hmap.h"
+#include "netdev-afxdp.h"
#include "netdev-provider.h"
#include "netdev-vport.h"
#include "netlink-notifier.h"
@@ -486,57 +488,6 @@ static int tc_calc_cell_log(unsigned int mtu);
static void tc_fill_rate(struct tc_ratespec *rate, uint64_t bps, int mtu);
static int tc_calc_buffer(unsigned int Bps, int mtu, uint64_t burst_bytes);
-struct netdev_linux {
- struct netdev up;
-
- /* Protects all members below. */
- struct ovs_mutex mutex;
-
- unsigned int cache_valid;
-
- bool miimon; /* Link status of last poll. */
- long long int miimon_interval; /* Miimon Poll rate. Disabled if <= 0. */
- struct timer miimon_timer;
-
- int netnsid; /* Network namespace ID. */
- /* The following are figured out "on demand" only. They are only valid
- * when the corresponding VALID_* bit in 'cache_valid' is set. */
- int ifindex;
- struct eth_addr etheraddr;
- int mtu;
- unsigned int ifi_flags;
- long long int carrier_resets;
- uint32_t kbits_rate; /* Policing data. */
- uint32_t kbits_burst;
- int vport_stats_error; /* Cached error code from vport_get_stats().
- 0 or an errno value. */
- int netdev_mtu_error; /* Cached error code from SIOCGIFMTU or SIOCSIFMTU. */
- int ether_addr_error; /* Cached error code from set/get etheraddr. */
- int netdev_policing_error; /* Cached error code from set policing. */
- int get_features_error; /* Cached error code from ETHTOOL_GSET. */
- int get_ifindex_error; /* Cached error code from SIOCGIFINDEX. */
-
- enum netdev_features current; /* Cached from ETHTOOL_GSET. */
- enum netdev_features advertised; /* Cached from ETHTOOL_GSET. */
- enum netdev_features supported; /* Cached from ETHTOOL_GSET. */
-
- struct ethtool_drvinfo drvinfo; /* Cached from ETHTOOL_GDRVINFO. */
- struct tc *tc;
-
- /* For devices of class netdev_tap_class only. */
- int tap_fd;
- bool present; /* If the device is present in the namespace */
- uint64_t tx_dropped; /* tap device can drop if the iface is down */
-
- /* LAG information. */
- bool is_lag_master; /* True if the netdev is a LAG master. */
-};
-
-struct netdev_rxq_linux {
- struct netdev_rxq up;
- bool is_tap;
- int fd;
-};
/* This is set pretty low because we probably won't learn anything from the
* additional log messages. */
@@ -550,8 +501,6 @@ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
* changes in the device miimon status, so we can use atomic_count. */
static atomic_count miimon_cnt = ATOMIC_COUNT_INIT(0);
-static void netdev_linux_run(const struct netdev_class *);
-
static int netdev_linux_do_ethtool(const char *name, struct ethtool_cmd *,
int cmd, const char *cmd_name);
static int get_flags(const struct netdev *, unsigned int *flags);
@@ -565,7 +514,6 @@ static int do_set_addr(struct netdev *netdev,
struct in_addr addr);
static int get_etheraddr(const char *netdev_name, struct eth_addr *ea);
static int set_etheraddr(const char *netdev_name, const struct eth_addr);
-static int get_stats_via_netlink(const struct netdev *, struct netdev_stats *);
static int af_packet_sock(void);
static bool netdev_linux_miimon_enabled(void);
static void netdev_linux_miimon_run(void);
@@ -573,31 +521,10 @@ static void netdev_linux_miimon_wait(void);
static int netdev_linux_get_mtu__(struct netdev_linux *netdev, int *mtup);
static bool
-is_netdev_linux_class(const struct netdev_class *netdev_class)
-{
- return netdev_class->run == netdev_linux_run;
-}
-
-static bool
is_tap_netdev(const struct netdev *netdev)
{
return netdev_get_class(netdev) == &netdev_tap_class;
}
-
-static struct netdev_linux *
-netdev_linux_cast(const struct netdev *netdev)
-{
- ovs_assert(is_netdev_linux_class(netdev_get_class(netdev)));
-
- return CONTAINER_OF(netdev, struct netdev_linux, up);
-}
-
-static struct netdev_rxq_linux *
-netdev_rxq_linux_cast(const struct netdev_rxq *rx)
-{
- ovs_assert(is_netdev_linux_class(netdev_get_class(rx->netdev)));
- return CONTAINER_OF(rx, struct netdev_rxq_linux, up);
-}
static int
netdev_linux_netnsid_update__(struct netdev_linux *netdev)
@@ -773,7 +700,7 @@ netdev_linux_update_lag(struct rtnetlink_change *change)
}
}
-static void
+void
netdev_linux_run(const struct netdev_class *netdev_class OVS_UNUSED)
{
struct nl_sock *sock;
@@ -3278,9 +3205,7 @@ exit:
.run = netdev_linux_run, \
.wait = netdev_linux_wait, \
.alloc = netdev_linux_alloc, \
- .destruct = netdev_linux_destruct, \
.dealloc = netdev_linux_dealloc, \
- .send = netdev_linux_send, \
.send_wait = netdev_linux_send_wait, \
.set_etheraddr = netdev_linux_set_etheraddr, \
.get_etheraddr = netdev_linux_get_etheraddr, \
@@ -3311,39 +3236,74 @@ exit:
.arp_lookup = netdev_linux_arp_lookup, \
.update_flags = netdev_linux_update_flags, \
.rxq_alloc = netdev_linux_rxq_alloc, \
- .rxq_construct = netdev_linux_rxq_construct, \
- .rxq_destruct = netdev_linux_rxq_destruct, \
.rxq_dealloc = netdev_linux_rxq_dealloc, \
- .rxq_recv = netdev_linux_rxq_recv, \
.rxq_wait = netdev_linux_rxq_wait, \
.rxq_drain = netdev_linux_rxq_drain
const struct netdev_class netdev_linux_class = {
NETDEV_LINUX_CLASS_COMMON,
.type = "system",
+ .is_pmd = false,
.construct = netdev_linux_construct,
+ .destruct = netdev_linux_destruct,
.get_stats = netdev_linux_get_stats,
.get_features = netdev_linux_get_features,
.get_status = netdev_linux_get_status,
- .get_block_id = netdev_linux_get_block_id
+ .get_block_id = netdev_linux_get_block_id,
+ .send = netdev_linux_send,
+ .rxq_construct = netdev_linux_rxq_construct,
+ .rxq_destruct = netdev_linux_rxq_destruct,
+ .rxq_recv = netdev_linux_rxq_recv,
};
const struct netdev_class netdev_tap_class = {
NETDEV_LINUX_CLASS_COMMON,
.type = "tap",
+ .is_pmd = false,
.construct = netdev_linux_construct_tap,
+ .destruct = netdev_linux_destruct,
.get_stats = netdev_tap_get_stats,
.get_features = netdev_linux_get_features,
.get_status = netdev_linux_get_status,
+ .send = netdev_linux_send,
+ .rxq_construct = netdev_linux_rxq_construct,
+ .rxq_destruct = netdev_linux_rxq_destruct,
+ .rxq_recv = netdev_linux_rxq_recv,
};
const struct netdev_class netdev_internal_class = {
NETDEV_LINUX_CLASS_COMMON,
.type = "internal",
+ .is_pmd = false,
.construct = netdev_linux_construct,
+ .destruct = netdev_linux_destruct,
.get_stats = netdev_internal_get_stats,
.get_status = netdev_internal_get_status,
+ .send = netdev_linux_send,
+ .rxq_construct = netdev_linux_rxq_construct,
+ .rxq_destruct = netdev_linux_rxq_destruct,
+ .rxq_recv = netdev_linux_rxq_recv,
};
+
+#ifdef HAVE_AF_XDP
+const struct netdev_class netdev_afxdp_class = {
+ NETDEV_LINUX_CLASS_COMMON,
+ .type = "afxdp",
+ .is_pmd = true,
+ .construct = netdev_linux_construct,
+ .destruct = netdev_afxdp_destruct,
+ .get_stats = netdev_afxdp_get_stats,
+ .get_status = netdev_linux_get_status,
+ .set_config = netdev_afxdp_set_config,
+ .get_config = netdev_afxdp_get_config,
+ .reconfigure = netdev_afxdp_reconfigure,
+ .get_numa_id = netdev_afxdp_get_numa_id,
+ .send = netdev_afxdp_batch_send,
+ .rxq_construct = netdev_afxdp_rxq_construct,
+ .rxq_destruct = netdev_afxdp_rxq_destruct,
+ .rxq_recv = netdev_afxdp_rxq_recv,
+};
+#endif
#define CODEL_N_QUEUES 0x0000
@@ -5915,7 +5875,7 @@ netdev_stats_from_rtnl_link_stats64(struct netdev_stats *dst,
dst->tx_window_errors = src->tx_window_errors;
}
-static int
+int
get_stats_via_netlink(const struct netdev *netdev_, struct netdev_stats *stats)
{
struct ofpbuf request;
@@ -832,6 +832,9 @@ extern const struct netdev_class netdev_linux_class;
extern const struct netdev_class netdev_internal_class;
extern const struct netdev_class netdev_tap_class;
+#ifdef HAVE_AF_XDP
+extern const struct netdev_class netdev_afxdp_class;
+#endif
#ifdef __cplusplus
}
#endif
@@ -103,6 +103,9 @@ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
static void restore_all_flags(void *aux OVS_UNUSED);
void update_device_args(struct netdev *, const struct shash *args);
+#ifdef HAVE_AF_XDP
+void signal_remove_xdp(struct netdev *netdev);
+#endif
int
netdev_n_txq(const struct netdev *netdev)
@@ -147,6 +150,9 @@ netdev_initialize(void)
netdev_vport_tunnel_register();
netdev_register_flow_api_provider(&netdev_offload_tc);
+#ifdef HAVE_AF_XDP
+ netdev_register_provider(&netdev_afxdp_class);
+#endif
#endif
#if defined(__FreeBSD__) || defined(__NetBSD__)
netdev_register_provider(&netdev_tap_class);
@@ -2021,6 +2027,11 @@ restore_all_flags(void *aux OVS_UNUSED)
saved_flags & ~saved_values,
&old_flags);
}
+#ifdef HAVE_AF_XDP
+ if (netdev->netdev_class == &netdev_afxdp_class) {
+ signal_remove_xdp(netdev);
+ }
+#endif
}
}
@@ -214,20 +214,19 @@ x2nrealloc(void *p, size_t *n, size_t s)
return xrealloc(p, *n * s);
}
-/* Allocates and returns 'size' bytes of memory aligned to a cache line and in
- * dedicated cache lines. That is, the memory block returned will not share a
- * cache line with other data, avoiding "false sharing".
+/* Allocates and returns 'size' bytes of memory aligned to 'alignment' bytes.
+ * 'alignment' must be a power of two and a multiple of sizeof(void *).
*
- * Use free_cacheline() to free the returned memory block. */
+ * Use free_size_align() to free the returned memory block. */
void *
-xmalloc_cacheline(size_t size)
+xmalloc_size_align(size_t size, size_t alignment)
{
#ifdef HAVE_POSIX_MEMALIGN
void *p;
int error;
COVERAGE_INC(util_xalloc);
- error = posix_memalign(&p, CACHE_LINE_SIZE, size ? size : 1);
+ error = posix_memalign(&p, alignment, size ? size : 1);
if (error != 0) {
out_of_memory();
}
@@ -235,16 +234,16 @@ xmalloc_cacheline(size_t size)
#else
/* Allocate room for:
*
- * - Header padding: Up to CACHE_LINE_SIZE - 1 bytes, to allow the
- * pointer to be aligned exactly sizeof(void *) bytes before the
- * beginning of a cache line.
+ * - Header padding: Up to alignment - 1 bytes, to allow the
+ * pointer 'q' to be aligned exactly sizeof(void *) bytes before the
+ * beginning of the alignment.
*
* - Pointer: A pointer to the start of the header padding, to allow us
* to free() the block later.
*
* - User data: 'size' bytes.
*
- * - Trailer padding: Enough to bring the user data up to a cache line
+ * - Trailer padding: Enough to bring the user data up to a alignment
* multiple.
*
* +---------------+---------+------------------------+---------+
@@ -255,18 +254,56 @@ xmalloc_cacheline(size_t size)
* p q r
*
*/
- void *p = xmalloc((CACHE_LINE_SIZE - 1)
- + sizeof(void *)
- + ROUND_UP(size, CACHE_LINE_SIZE));
- bool runt = PAD_SIZE((uintptr_t) p, CACHE_LINE_SIZE) < sizeof(void *);
- void *r = (void *) ROUND_UP((uintptr_t) p + (runt ? CACHE_LINE_SIZE : 0),
- CACHE_LINE_SIZE);
- void **q = (void **) r - 1;
+ void *p, *r, **q;
+ bool runt;
+
+ COVERAGE_INC(util_xalloc);
+ if (!IS_POW2(alignment) || (alignment % sizeof(void *) != 0)) {
+ ovs_abort(0, "Invalid alignment");
+ }
+
+ p = xmalloc((alignment - 1)
+ + sizeof(void *)
+ + ROUND_UP(size, alignment));
+
+ runt = PAD_SIZE((uintptr_t) p, alignment) < sizeof(void *);
+ /* When the padding size < sizeof(void*), we don't have enough room for
+ * pointer 'q'. As a reuslt, need to move 'r' to the next alignment.
+ * So ROUND_UP when xmalloc above, and ROUND_UP again when calculate 'r'
+ * below.
+ */
+ r = (void *) ROUND_UP((uintptr_t) p + (runt ? alignment : 0), alignment);
+ q = (void **) r - 1;
*q = p;
+
return r;
#endif
}
+void
+free_size_align(void *p)
+{
+#ifdef HAVE_POSIX_MEMALIGN
+ free(p);
+#else
+ if (p) {
+ void **q = (void **) p - 1;
+ free(*q);
+ }
+#endif
+}
+
+/* Allocates and returns 'size' bytes of memory aligned to a cache line and in
+ * dedicated cache lines. That is, the memory block returned will not share a
+ * cache line with other data, avoiding "false sharing".
+ *
+ * Use free_cacheline() to free the returned memory block. */
+void *
+xmalloc_cacheline(size_t size)
+{
+ return xmalloc_size_align(size, CACHE_LINE_SIZE);
+}
+
/* Like xmalloc_cacheline() but clears the allocated memory to all zero
* bytes. */
void *
@@ -282,14 +319,19 @@ xzalloc_cacheline(size_t size)
void
free_cacheline(void *p)
{
-#ifdef HAVE_POSIX_MEMALIGN
- free(p);
-#else
- if (p) {
- void **q = (void **) p - 1;
- free(*q);
- }
-#endif
+ free_size_align(p);
+}
+
+void *
+xmalloc_pagealign(size_t size)
+{
+ return xmalloc_size_align(size, get_page_size());
+}
+
+void
+free_pagealign(void *p)
+{
+ free_size_align(p);
}
char *
@@ -169,6 +169,11 @@ void ovs_strzcpy(char *dst, const char *src, size_t size);
int string_ends_with(const char *str, const char *suffix);
+void *xmalloc_pagealign(size_t) MALLOC_LIKE;
+void free_pagealign(void *);
+void *xmalloc_size_align(size_t, size_t) MALLOC_LIKE;
+void free_size_align(void *);
+
/* The C standards say that neither the 'dst' nor 'src' argument to
* memcpy() may be null, even if 'n' is zero. This wrapper tolerates
* the null case. */
@@ -13,6 +13,9 @@
/ovsdb-cluster-testsuite.dir/
/ovsdb-cluster-testsuite.log
/pki/
+/system-afxdp-testsuite
+/system-afxdp-testsuite.dir/
+/system-afxdp-testsuite.log
/system-dpdk-testsuite
/system-dpdk-testsuite.dir/
/system-dpdk-testsuite.log
@@ -4,12 +4,14 @@ EXTRA_DIST += \
$(SYSTEM_TESTSUITE_AT) \
$(SYSTEM_KMOD_TESTSUITE_AT) \
$(SYSTEM_USERSPACE_TESTSUITE_AT) \
+ $(SYSTEM_AFXDP_TESTSUITE_AT) \
$(SYSTEM_OFFLOADS_TESTSUITE_AT) \
$(SYSTEM_DPDK_TESTSUITE_AT) \
$(OVSDB_CLUSTER_TESTSUITE_AT) \
$(TESTSUITE) \
$(SYSTEM_KMOD_TESTSUITE) \
$(SYSTEM_USERSPACE_TESTSUITE) \
+ $(SYSTEM_AFXDP_TESTSUITE) \
$(SYSTEM_OFFLOADS_TESTSUITE) \
$(SYSTEM_DPDK_TESTSUITE) \
$(OVSDB_CLUSTER_TESTSUITE) \
@@ -160,6 +162,11 @@ SYSTEM_USERSPACE_TESTSUITE_AT = \
tests/system-userspace-macros.at \
tests/system-userspace-packet-type-aware.at
+SYSTEM_AFXDP_TESTSUITE_AT = \
+ tests/system-userspace-macros.at \
+ tests/system-afxdp-testsuite.at \
+ tests/system-afxdp-macros.at
+
SYSTEM_TESTSUITE_AT = \
tests/system-common-macros.at \
tests/system-ovn.at \
@@ -184,6 +191,7 @@ TESTSUITE = $(srcdir)/tests/testsuite
TESTSUITE_PATCH = $(srcdir)/tests/testsuite.patch
SYSTEM_KMOD_TESTSUITE = $(srcdir)/tests/system-kmod-testsuite
SYSTEM_USERSPACE_TESTSUITE = $(srcdir)/tests/system-userspace-testsuite
+SYSTEM_AFXDP_TESTSUITE = $(srcdir)/tests/system-afxdp-testsuite
SYSTEM_OFFLOADS_TESTSUITE = $(srcdir)/tests/system-offloads-testsuite
SYSTEM_DPDK_TESTSUITE = $(srcdir)/tests/system-dpdk-testsuite
OVSDB_CLUSTER_TESTSUITE = $(srcdir)/tests/ovsdb-cluster-testsuite
@@ -317,6 +325,10 @@ check-system-userspace: all
set $(SHELL) '$(SYSTEM_USERSPACE_TESTSUITE)' -C tests AUTOTEST_PATH='$(AUTOTEST_PATH)'; \
"$$@" $(TESTSUITEFLAGS) -j1 || (test X'$(RECHECK)' = Xyes && "$$@" --recheck)
+check-afxdp: all
+ set $(SHELL) '$(SYSTEM_AFXDP_TESTSUITE)' -C tests AUTOTEST_PATH='$(AUTOTEST_PATH)' $(TESTSUITEFLAGS) -j1; \
+ "$$@" || (test X'$(RECHECK)' = Xyes && "$$@" --recheck)
+
check-offloads: all
set $(SHELL) '$(SYSTEM_OFFLOADS_TESTSUITE)' -C tests AUTOTEST_PATH='$(AUTOTEST_PATH)'; \
"$$@" $(TESTSUITEFLAGS) -j1 || (test X'$(RECHECK)' = Xyes && "$$@" --recheck)
@@ -354,6 +366,10 @@ $(SYSTEM_USERSPACE_TESTSUITE): package.m4 $(SYSTEM_TESTSUITE_AT) $(SYSTEM_USERSP
$(AM_V_GEN)$(AUTOTEST) -I '$(srcdir)' -o $@.tmp $@.at
$(AM_V_at)mv $@.tmp $@
+$(SYSTEM_AFXDP_TESTSUITE): package.m4 $(SYSTEM_TESTSUITE_AT) $(SYSTEM_AFXDP_TESTSUITE_AT) $(COMMON_MACROS_AT)
+ $(AM_V_GEN)$(AUTOTEST) -I '$(srcdir)' -o $@.tmp $@.at
+ $(AM_V_at)mv $@.tmp $@
+
$(SYSTEM_OFFLOADS_TESTSUITE): package.m4 $(SYSTEM_TESTSUITE_AT) $(SYSTEM_OFFLOADS_TESTSUITE_AT) $(COMMON_MACROS_AT)
$(AM_V_GEN)$(AUTOTEST) -I '$(srcdir)' -o $@.tmp $@.at
$(AM_V_at)mv $@.tmp $@
new file mode 100644
@@ -0,0 +1,39 @@
+# Add port to ovs bridge by using afxdp mode.
+# This will use generic XDP support in the veth driver.
+m4_define([ADD_VETH],
+ [ AT_CHECK([ip link add $1 type veth peer name ovs-$1 || return 77])
+ CONFIGURE_VETH_OFFLOADS([$1])
+ AT_CHECK([ip link set $1 netns $2])
+ AT_CHECK([ip link set dev ovs-$1 up])
+ AT_CHECK([ovs-vsctl add-port $3 ovs-$1 -- \
+ set interface ovs-$1 external-ids:iface-id="$1" type="afxdp"])
+ NS_CHECK_EXEC([$2], [ip addr add $4 dev $1 $7])
+ NS_CHECK_EXEC([$2], [ip link set dev $1 up])
+ if test -n "$5"; then
+ NS_CHECK_EXEC([$2], [ip link set dev $1 address $5])
+ fi
+ if test -n "$6"; then
+ NS_CHECK_EXEC([$2], [ip route add default via $6])
+ fi
+ on_exit 'ip link del ovs-$1'
+ ]
+)
+
+m4_define([OVS_CHECK_8021AD],
+ [AT_SKIP_IF([:])])
+
+# CONFIGURE_VETH_OFFLOADS([VETH])
+#
+# Disable TX offloads and VLAN offloads for veths used in AF_XDP.
+m4_define([CONFIGURE_VETH_OFFLOADS],
+ [AT_CHECK([ethtool -K $1 tx off], [0], [ignore], [ignore])
+ AT_CHECK([ethtool -K $1 txvlan off], [0], [ignore], [ignore])
+ ]
+)
+
+# OVS_START_L7([namespace], [protocol])
+#
+# AF_XDP doesn't work with TCP over virtual interfaces for now.
+#
+m4_define([OVS_START_L7],
+ [AT_SKIP_IF([:])])
new file mode 100644
@@ -0,0 +1,26 @@
+AT_INIT
+
+AT_COPYRIGHT([Copyright (c) 2018, 2019 Nicira, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at:
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.])
+
+m4_ifdef([AT_COLOR_TESTS], [AT_COLOR_TESTS])
+
+m4_include([tests/ovs-macros.at])
+m4_include([tests/ovsdb-macros.at])
+m4_include([tests/ofproto-macros.at])
+m4_include([tests/system-common-macros.at])
+m4_include([tests/system-userspace-macros.at])
+m4_include([tests/system-afxdp-macros.at])
+
+m4_include([tests/system-traffic.at])
@@ -71,6 +71,7 @@ AT_CLEANUP
AT_SETUP([datapath - ping between two ports on cvlan])
OVS_TRAFFIC_VSWITCHD_START()
+OVS_CHECK_8021AD()
AT_CHECK([ovs-ofctl add-flow br0 "actions=normal"])
@@ -161,6 +162,7 @@ AT_CLEANUP
AT_SETUP([datapath - ping6 between two ports on cvlan])
OVS_TRAFFIC_VSWITCHD_START()
+OVS_CHECK_8021AD()
AT_CHECK([ovs-ofctl add-flow br0 "actions=normal"])
@@ -3107,6 +3107,21 @@ ovs-vsctl add-port br0 p0 -- set Interface p0 type=patch options:peer=p1 \
</p>
</column>
+ <column name="other_config" key="xdpmode"
+ type='{"type": "string",
+ "enum": ["set", ["skb", "drv"]]}'>
+ <p>
+ Specifies the operational mode of the XDP program.
+ If "drv", the XDP program is loaded into the device driver with
+ zero-copy RX and TX enabled. This mode requires device driver with
+ AF_XDP support and has the best performance.
+ If "skb", the XDP program is using generic XDP mode in kernel with
+ extra data copying between userspace and kernel. No device driver
+ support is needed. Note that this is afxdp netdev type only.
+ Defaults to "skb" mode.
+ </p>
+ </column>
+
<column name="options" key="vhost-server-path"
type='{"type": "string"}'>
<p>
The patch introduces experimental AF_XDP support for OVS netdev. AF_XDP, the Address Family of the eXpress Data Path, is a new Linux socket type built upon the eBPF and XDP technology. It is aims to have comparable performance to DPDK but cooperate better with existing kernel's networking stack. An AF_XDP socket receives and sends packets from an eBPF/XDP program attached to the netdev, by-passing a couple of Linux kernel's subsystems As a result, AF_XDP socket shows much better performance than AF_PACKET For more details about AF_XDP, please see linux kernel's Documentation/networking/af_xdp.rst. Note that by default, this feature is not compiled in. Signed-off-by: William Tu <u9012063@gmail.com> --- v15: * address review feedback from Ilya https://patchwork.ozlabs.org/patch/1125476/ * skip TCP related test cases * reclaim all CONS_NUM_DESC at complete tx * add retries to kick_tx * increase memory pool size * remove redundant xdp flag and bind flag * remove unused rx_dropped var * make tx_dropped counter atomic * refactor dp_packet_init_afxdp using dp_packet_init__ * rebase to ovs master, test with latest bpf-next kernel commit b14a260e33ddb4 Ilya's kernel patches are required commit 455302d1c9ae ("xdp: fix hang while unregistering device bound to xdp socket") commit 162c820ed896 ("xdp: hold device for umem regardless of zero-copy mode") Possible issues: * still lots of afxdp_cq_skip (ovs-appctl coverage/show) afxdp_cq_skip 44325273.6/sec 34362312.683/sec 572705.2114/sec total: 2106010377 * TODO: 'make check-afxdp' still not all pass IP fragmentation expiry test not fix yet, need to implement deferral memory free, s.t like dpdk_mp_sweep. Currently hit some missing umem descs when reclaiming. NSH test case still failed (not due to afxdp) v16: * address feedbacks from Ilya * add deferral memory free * add afxdp testsuites files to gitignore v17: * address feedbacks from Ilya and Ben https://patchwork.ozlabs.org/patch/1131547/ * ovs_spin_lock: add pthread_spin_lock checks, fix typo * update NEWS * add pthread_spin_lock check at OVS_CHECK_LINUX_AF_XDP * fix bug in xmalloc_size_align * rename xdpsock to netdev-afxdp-pool * remove struct umem_elem, use void * * fix style and comments * fix afxdp.rst * rebase to OVS master, tested on kernel 5.2.0-rc6 Note: I still leave the last_tsc in pmd_perf_stats the same as v16 v18: * address feedbacks from Ilya and Ben https://patchwork.ozlabs.org/patch/1133416/ * update document about tcp and reconfiguration * fix leak in tx spin locks * refactor __umem_pool alloc and assert * refactor macro and defines used in netdev-afxdp[-pool] * refactor the xpool->array to remove using type casting * add empty netdev_afxdp_rxq_destruct to avoid closing afxdp socket --- Documentation/automake.mk | 1 + Documentation/index.rst | 1 + Documentation/intro/install/afxdp.rst | 432 ++++++++++++++ Documentation/intro/install/index.rst | 1 + NEWS | 1 + acinclude.m4 | 35 ++ configure.ac | 1 + lib/automake.mk | 10 + lib/dp-packet.c | 23 + lib/dp-packet.h | 18 +- lib/dpif-netdev-perf.h | 24 + lib/netdev-afxdp-pool.c | 167 ++++++ lib/netdev-afxdp-pool.h | 58 ++ lib/netdev-afxdp.c | 1041 +++++++++++++++++++++++++++++++++ lib/netdev-afxdp.h | 73 +++ lib/netdev-linux-private.h | 132 +++++ lib/netdev-linux.c | 126 ++-- lib/netdev-provider.h | 3 + lib/netdev.c | 11 + lib/util.c | 92 ++- lib/util.h | 5 + tests/.gitignore | 3 + tests/automake.mk | 16 + tests/system-afxdp-macros.at | 39 ++ tests/system-afxdp-testsuite.at | 26 + tests/system-traffic.at | 2 + vswitchd/vswitch.xml | 15 + 27 files changed, 2247 insertions(+), 109 deletions(-) create mode 100644 Documentation/intro/install/afxdp.rst create mode 100644 lib/netdev-afxdp-pool.c create mode 100644 lib/netdev-afxdp-pool.h create mode 100644 lib/netdev-afxdp.c create mode 100644 lib/netdev-afxdp.h create mode 100644 lib/netdev-linux-private.h create mode 100644 tests/system-afxdp-macros.at create mode 100644 tests/system-afxdp-testsuite.at