[ovs-dev] [PATCH dpdk-latest v4] build: Add support for DPDK meson build.

[Richardson, Bruce]

<snip>

> > > Hi Ilya
> > > I tested the patch
> > > https://patchwork.ozlabs.org/project/openvswitch/patch/1607977825-
> 30877-1-
> > > git-send-email-ian.stokes at intel.com/
> > > As I said if we update the pkg-conf to new version. and we config the
> > > ovs --with-dpdk=static, ovs works fine.
> > > but if we build ovs --with-dpdk=shared, ovs doesn't work, there is
> error
> > > log:
> > > 2020-12-14T20:15:07.940Z|00018|dpdk|INFO|EAL ARGS: ovs-vswitchd -a
> > >
> 0000:82:00.0,dv_flow_en=1,dv_esw_en=1,l3_vxlan_en=1,dv_xmeta_en=2,represen
> > > tor=[0-6]
> > > -c 0xe --huge-dir /dev/hugepages --socket-mem 1024,1024 --socket-limit
> > > 1024,1024.
> > > 2020-12-14T20:15:07.946Z|00019|dpdk|INFO|EAL: Detected 56 lcore(s)
> > > 2020-12-14T20:15:07.946Z|00020|dpdk|INFO|EAL: Detected 2 NUMA nodes
> > > 2020-12-14T20:15:07.946Z|00021|dpdk|ERR|EAL: failed to parse device
> > > "0000:82:00.0"
> > > 2020-12-14T20:15:07.946Z|00022|dpdk|ERR|EAL: Unable to parse device
> > >
> '0000:82:00.0,dv_flow_en=1,dv_esw_en=1,l3_vxlan_en=1,dv_xmeta_en=2,represe
> > > ntor=[0-6]'
> > > 2020-12-14T20:15:07.946Z|00023|dpdk|EMER|Unable to initialize DPDK: No
> > > such device
> > >
> > > because pci bus was not registered.
> > >
> > > In dpdk:
> > > eal_plugins_init
> > > rte_pci_scan
> > > eal_option_device_parse -- no pci bus
> > >
> > >
> >
> > Is DPDK installed systemwide so that the drivers - including pci bus
> > driver - can be picked up automatically on init? If not, you may well
> > need to pass the path to the drivers via the "-d" flag on startup.
> Hi
> I build ovs, shown as below:
> 
> export DPDK_TARGET=x86_64-native-linuxapp-gcc
> meson -Dprefix=/root/local/dpdk-next-net -Dmax_ethports=256
> -Dbuildtype=debug
> -Ddisable_drivers=event/*,net/tap,net/nfb,net/mlx4,crypto/*
> $DPDK_TARGET
> ninja -C $DPDK_TARGET install
> ldconfig
> 
> export LD_LIBRARY_PATH=/root/local/dpdk-next-net/lib64:$LD_LIBRARY_PATH
> export PKG_CONFIG_PATH=/root/local/dpdk-next-
> net/lib64/pkgconfig/:$PKG_CONFIG_PATH
> ./configure --enable-Werror --prefix=/root/local/openvswitch-2.14
> --disable-ssl --disable-libcapng --with-dpdk=shared 'CFLAGS=-g -O0
> -Wno-deprecated-declarations'
> make && make install
> 
> One question if we export  LD_LIBRARY_PATH, we also use "-d" flag ?
> 
> > Regards,
> > /Bruce

In the case above, I think the drivers should all be loaded automatically
from "/root/local/dpdk-next-net/lib64/dpdk/pmds-21.0/". The RTE_EAL_PMD_PATH
should point to that location.

To verify, can you check the "rte_build_config.h" file in your DPDK build,
and confirm that the path given there for RTE_EAL_PMD_PATH corresponds to
the path where the actual driver .so files are installed?

/Bruce