From: Markus Armbruster <armbru@redhat.com>
To: Andrew Melnichenko <andrew@daynix.com>
Cc: "Daniel P. Berrangé" <berrange@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
"Jason Wang" <jasowang@redhat.com>,
qemu-devel@nongnu.org,
"Yuri Benditovich" <yuri.benditovich@daynix.com>,
"Yan Vugenfirer" <yan@daynix.com>,
"Eric Blake" <eblake@redhat.com>
Subject: Re: [PATCH 5/5] qmp: Added qemu-ebpf-rss-path command.
Date: Tue, 24 Aug 2021 08:41:34 +0200 [thread overview]
Message-ID: <877dgbpco1.fsf@dusky.pond.sub.org> (raw)
In-Reply-To: <CABcq3pE3vAh=Cs=VjjkioooEbbPjgNEtCEZGwtoxaCn0OCRQkg@mail.gmail.com> (Andrew Melnichenko's message of "Tue, 10 Aug 2021 14:58:41 +0300")
Andrew Melnichenko <andrew@daynix.com> writes:
> Hi,
>
>> The helper may or may not be installed at the path compiled into QEMU.
>>
> Yes, so the helper will not be called - QEMU will try to initiate eBPF RSS
> or use "in-qemu" RSS.
My point is: the proposed command's mission is to help the management
application run the right helper. However, its advice is *unreliable*.
It may point to the wrong helper, or to nothing at all. The right
helper may still exist elsewhere.
I suspect you're trying to address the problem at the wrong level.
Similar versioning issues exist with other helpers. We've been doing
fine without QEMU providing unreliable advice on where they might sit in
the file system. What makes this one different?
>> What happens when you use the wrong helper?
>>
> UB - in most cases, eBPF program will work with wrong configurations.
> That's why the stamp was added.
>
> query-helper-paths checks the stamp only for RSS helper.
I have no idea what you're talking about :)
My best guess is that you're trying to tell me that attempting to work
with the wrong helper will fail cleanly due to some stamp check. That
would be nice.
next prev parent reply other threads:[~2021-08-24 6:43 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-13 15:37 [PATCH 0/5] ebpf: Added ebpf helper for libvirtd Andrew Melnychenko
2021-07-13 15:37 ` [PATCH 1/5] ebpf: Added eBPF initialization by fds and map update Andrew Melnychenko
2021-08-20 3:34 ` Jason Wang
2021-08-25 18:13 ` Andrew Melnichenko
2021-07-13 15:37 ` [PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
2021-08-20 3:36 ` Jason Wang
2021-08-25 18:18 ` Andrew Melnichenko
2021-07-13 15:37 ` [PATCH 3/5] qmp: Added the helper stamp check Andrew Melnychenko
2021-07-13 15:37 ` [PATCH 4/5] ebpf_rss_helper: Added helper for eBPF RSS Andrew Melnychenko
2021-08-20 3:40 ` Jason Wang
2021-08-25 18:24 ` Andrew Melnichenko
2021-09-01 6:37 ` Jason Wang
2021-08-30 17:07 ` Yuri Benditovich
2021-09-01 6:42 ` Jason Wang
2021-09-06 15:50 ` Andrew Melnichenko
2021-09-07 3:22 ` Jason Wang
2021-09-07 10:40 ` Yuri Benditovich
2021-09-08 3:45 ` Jason Wang
2021-09-09 0:00 ` Yuri Benditovich
2021-09-09 1:16 ` Jason Wang
2021-09-09 23:43 ` Yuri Benditovich
2021-09-10 1:37 ` Jason Wang
2021-07-13 15:37 ` [PATCH 5/5] qmp: Added qemu-ebpf-rss-path command Andrew Melnychenko
2021-08-07 12:54 ` Markus Armbruster
2021-08-10 11:58 ` Andrew Melnichenko
2021-08-24 6:41 ` Markus Armbruster [this message]
2021-08-25 18:45 ` Andrew Melnichenko
2021-08-26 4:53 ` Markus Armbruster
2021-08-29 20:13 ` Yuri Benditovich
2021-08-30 6:10 ` Markus Armbruster
2021-08-30 7:51 ` Yuri Benditovich
2021-08-30 8:13 ` Markus Armbruster
2021-08-30 16:56 ` Yuri Benditovich
2021-08-31 15:00 ` Markus Armbruster
2021-08-31 19:37 ` Andrew Melnichenko
2021-09-01 7:16 ` Markus Armbruster
[not found] ` <CABcq3pGzs=RqLCuu70KyWt7W6T=qEhihK6v=iHJyfuGqiN_Q+A@mail.gmail.com>
[not found] ` <CAOEp5Oc_uUn2nJq+B+SK-iQSo5udyUTirWHS5=8N0JxerRaz7A@mail.gmail.com>
2021-09-09 10:35 ` Andrew Melnichenko
2021-09-02 16:06 ` Markus Armbruster
2021-07-22 8:37 ` [PATCH 0/5] ebpf: Added ebpf helper for libvirtd Andrew Melnichenko
2021-08-16 11:57 ` Yuri Benditovich
2021-08-17 5:49 ` Jason Wang
2021-08-20 3:43 ` Jason Wang
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