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From: "Loftus, Ciara" <ciara.loftus@intel.com>
To: "Yigit, Ferruh" <ferruh.yigit@intel.com>, "dev@dpdk.org" <dev@dpdk.org>
Cc: "stephen@networkplumber.org" <stephen@networkplumber.org>,
	"Burakov, Anatoly" <anatoly.burakov@intel.com>,
	"Singh, Aman Deep" <aman.deep.singh@intel.com>
Subject: RE: [PATCH v4] net/af_xdp: re-enable secondary process support
Date: Thu, 10 Feb 2022 17:47:21 +0000	[thread overview]
Message-ID: <PH0PR11MB4791786D25C6AB5E63E0A5888E2F9@PH0PR11MB4791.namprd11.prod.outlook.com> (raw)
In-Reply-To: <daeb5710-6541-6743-3ba0-66e201b3a5be@intel.com>

> Subject: Re: [PATCH v4] net/af_xdp: re-enable secondary process support
> 
> On 2/10/2022 3:40 PM, Loftus, Ciara wrote:
> >> Subject: Re: [PATCH v4] net/af_xdp: re-enable secondary process support
> >>
> >> On 2/9/2022 9:48 AM, Ciara Loftus wrote:
> >>> Secondary process support had been disabled for the AF_XDP PMD
> >> because
> >>> there was no logic in place to share the AF_XDP socket file descriptors
> >>> between the processes. 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.

Thanks,
Ciara

> 


  reply	other threads:[~2022-02-10 17:47 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-10 15:32 [RFC PATCH] net/af_xdp: reenable " Ciara Loftus
2021-12-11 21:49 ` Stephen Hemminger
2022-01-12  7:54 ` [PATCH] net/af_xdp: re-enable " Ciara Loftus
2022-02-04 12:54   ` [PATCH v2] " Ciara Loftus
2022-02-04 14:18     ` Ferruh Yigit
2022-02-07  7:49       ` Loftus, Ciara
2022-02-07 10:27         ` Ferruh Yigit
2022-02-07 11:39           ` Loftus, Ciara
2022-02-08 10:58             ` Ferruh Yigit
2022-02-08 13:48     ` [PATCH v3] " Ciara Loftus
2022-02-08 17:45       ` Stephen Hemminger
2022-02-08 18:00         ` Ferruh Yigit
2022-02-08 18:42           ` Stephen Hemminger
2022-02-08 18:56             ` Ferruh Yigit
2022-02-09  7:41               ` Loftus, Ciara
2022-02-09  9:48       ` [PATCH v4] " Ciara Loftus
2022-02-09 15:29         ` Stephen Hemminger
2022-02-11 13:32           ` Ferruh Yigit
2022-02-09 17:55         ` Ferruh Yigit
2022-02-10 15:08           ` Ferruh Yigit
2022-02-10 15:19         ` Ferruh Yigit
2022-02-10 15:40           ` Loftus, Ciara
2022-02-10 16:06             ` Ferruh Yigit
2022-02-10 17:47               ` Loftus, Ciara [this message]
2022-02-10 20:12                 ` Ferruh Yigit
2022-02-11  7:28                   ` Loftus, Ciara
2022-02-11  9:26                     ` Loftus, Ciara
2022-02-11 12:29                       ` Ferruh Yigit
2022-02-11 13:01                         ` Loftus, Ciara
2022-02-11 13:07                           ` Ferruh Yigit
2022-02-11 15:32                             ` Loftus, Ciara
2022-02-16 11:23                               ` Loftus, Ciara
2022-02-11 11:31                     ` Ferruh Yigit
2022-02-17 12:44         ` David Marchand
2022-02-17 12:47           ` Ferruh Yigit
2022-02-17 12:53             ` David Marchand

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