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This commit introduces this logic using the >> IPC >>>>>>> APIs. >>>>>>> >>>>>>> Rx and Tx are disabled in the secondary process due to memory >> mapping >>>> of >>>>>>> the AF_XDP rings being assigned by the kernel in the primary process >>>> only. >>>>>>> However other operations including retrieval of stats are permitted. >>>>>>> >>>>>>> Signed-off-by: Ciara Loftus <ciara.loftus@intel.com> >>>>>>> >>>>>> >>>>>> Hi Ciara, >>>>>> >>>>>> When I tried to test the patch getting following error [1], it doesn't look >>>>>> related to this patch but can you help to fix the issue, thanks. >>>>>> >>>>>> [1] >>>>>> libxdp: Couldn't find a BPF file with name xsk_def_xdp_prog.o >>>>>> xsk_configure(): Failed to create xsk socket. >>>>>> eth_rx_queue_setup(): Failed to configure xdp socket >>>>>> Fail to configure port 2 rx queues >>>>>> EAL: Error - exiting with code: 1 >>>>> >>>>> >>>>> Hi Ferruh, >>>>> >>>>> This file should be generated when libxdp is compiled. >>>>> Mine is located @ /usr/local/lib/bpf/xsk_def_xdp_prog.o >>>>> Can you check if that file is there for you? It could be in >>>> /usr/local/lib64/bpf/ on your machine. >>>>> What kernel are you running on? >>>>> >>>> >>>> It is in: /usr/local/lib64/bpf/xsk_def_xdp_prog.o >>>> >>>> I had to compile libxdp from source because OS package version was old >>>> to work with af_xdp. >>>> Is something required to point location of this file to af_xdp PMD? >>>> >>>> I run kernel: >>>> 5.15.16-200.fc35.x86_64 >>> >>> I read through the libxdp code to figure out what happens when searching >> for the file: >>> https://github.com/xdp-project/xdp- >> tools/blob/v1.2.2/lib/libxdp/libxdp.c#L1055 >>> >>> secure_getenv(XDP_OBJECT_ENVVAR) is called which according to the >> README "defaults to /usr/lib/bpf (or /usr/lib64/bpf on systems using a split >> library path)". >>> If that fails, BPF_OBJECT_PATH will be searched, which points to >> /usr/lib/bpf >>> >>> I discovered that on my system the getenv() call fails, but the file is >> eventually found because luckily BPF_OBJECT_PATH points to the >> appropriate place for me (lib): >>> https://github.com/xdp-project/xdp-tools/blob/v1.2.2/lib/util/util.h#L24 >>> I suspect the same failure is happening for you, but since >> BPF_OBJECT_PATH points to lib and not lib64, the file is not found. >>> As a temporary measure can you create a symlink in /usr/local/lib/bpf/ to >> point to /usr/local/lib/bpf/xsk_def_xdp_prog.o >>> I will investigate the libxdp issue further. Maybe a change is needed in the >> library. If a change or setup recommendation is needed in DPDK I will create a >> patch. >>> >> >> >> I don't have XDP_OBJECT_ENVVAR or BPF_OBJECT_PATH environment >> variables set, >> if they should be we should document them. >> >> When I created '/usr/local/lib/bpf/' link, the BPF file found. >> This should be clarified/documented for users. > > Ok. Ideally we shouldn't have to create the symlink. I will look for a better solution and submit a patch. > The symlink might be a temporary solution if another solution is not found. > ack >> >> >> And still observing following two: >> >> 1) I don't know what following log means: >> Configuring Port 2 (socket 0) >> libbpf: elf: skipping unrecognized data section(7) .xdp_run_config >> libbpf: elf: skipping unrecognized data section(8) xdp_metadata >> libxdp: XDP flag not supported by libxdp. >> libbpf: elf: skipping unrecognized data section(8) xdp_metadata >> libbpf: elf: skipping unrecognized data section(8) xdp_metadata > > I reported this and a patch was submitted to libbpf to demote those logs: > https://www.spinics.net/lists/bpf/msg49140.html > It looks like the patch never made it. I'll chase it up. thanks > Anyway, the logs can be ignored as they are not errors. > Should we document this? >> >> 2) When I try to create two af_xdp interface, I only got one: >> "--vdev net_af_xdp,iface=enp24s0f1 --vdev net_af_xdp,iface=enp24s0f0" > > This is also expected as you haven't given each vdev a unique name. Try: > "--vdev net_af_xdp0,iface=enp24s0f1 --vdev net_af_xdp1,iface=enp24s0f0" > Yes of course :(, it works now, and I did verify the proc-info stats works. > Thank you for the testing. > > Ciara > >> >> >> Thanks, >> ferruh