From: Eelco Chaudron <echaudro@redhat.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: "Xia, Chenbo" <chenbo.xia@intel.com>,
Thomas Monjalon <thomas@monjalon.net>,
david.marchand@redhat.com, dev@dpdk.org
Subject: Re: [PATCH v3 4/4] vhost: add device op to offload the interrupt kick
Date: Wed, 31 May 2023 13:21:45 +0200 [thread overview]
Message-ID: <C54606A6-EE26-4786-AD4A-4771FF7F254F@redhat.com> (raw)
In-Reply-To: <11c40eca-5847-dfb4-470d-7da86fe7e51e@redhat.com>
On 31 May 2023, at 11:29, Maxime Coquelin wrote:
> On 5/31/23 08:19, Xia, Chenbo wrote:
>>> -----Original Message-----
>>> From: Maxime Coquelin <maxime.coquelin@redhat.com>
>>> Sent: Tuesday, May 30, 2023 11:17 PM
>>> To: Thomas Monjalon <thomas@monjalon.net>; Eelco Chaudron
>>> <echaudro@redhat.com>; Xia, Chenbo <chenbo.xia@intel.com>;
>>> david.marchand@redhat.com
>>> Cc: dev@dpdk.org
>>> Subject: Re: [PATCH v3 4/4] vhost: add device op to offload the interrupt
>>> kick
>>>
>>>
>>>
>>> On 5/30/23 15:16, Thomas Monjalon wrote:
>>>> 30/05/2023 15:02, Maxime Coquelin:
>>>>>
>>>>> On 5/17/23 11:09, Eelco Chaudron wrote:
>>>>>> This patch adds an operation callback which gets called every time the
>>>>>> library wants to call eventfd_write(). This eventfd_write() call could
>>>>>> result in a system call, which could potentially block the PMD thread.
>>>>>>
>>>>>> The callback function can decide whether it's ok to handle the
>>>>>> eventfd_write() now or have the newly introduced function,
>>>>>> rte_vhost_notify_guest(), called at a later time.
>>>>>>
>>>>>> This can be used by 3rd party applications, like OVS, to avoid system
>>>>>> calls being called as part of the PMD threads.
>>>>>>
>>>>>> Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
>>>>>> ---
>>>>>> lib/vhost/meson.build | 2 ++
>>>>>> lib/vhost/rte_vhost.h | 23 +++++++++++++++++-
>>>>>> lib/vhost/socket.c | 63
>>> ++++++++++++++++++++++++++++++++++++++++++++++---
>>>>>> lib/vhost/version.map | 9 +++++++
>>>>>> lib/vhost/vhost.c | 38 ++++++++++++++++++++++++++++++
>>>>>> lib/vhost/vhost.h | 58 ++++++++++++++++++++++++++++++++------
>>> -------
>>>>>> 6 files changed, 171 insertions(+), 22 deletions(-)
>>>>>>
>>>>>
>>>>>
>>>>> The patch looks good to me, but that's the first time we use function
>>>>> versioning in Vhost library, so I'd like another pair of eyes to be
>>> sure
>>>>> I don't miss anything.
>>>>>
>>>>> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>>>>>
>>>>> Thomas, do we need to mention it somewhere in the release note?
>>>>
>>>> If compatibility is kept, I think we don't need to mention it.
>>>>
>>>>
>>>
>>> Thanks Thomas for the information.
>>>
>>> Maxime
>>
>> About release note, except the versioning, there is also one new API introduced
>> in this patch, so we still need to mention this in release note
>
> Right, good catch.
> Eelco, let me know what you would put, I'll add it while applying (No
> need for a new revision).
Thanks guys! What about the following release note addition:
* **Added callback API support for interrupt handling in the vhost library.**
A new callback, guest_notify, is introduced that can be used to handle the interrupt kick outside of the datapath fast path. In addition, a new API, rte_vhost_notify_guest(), is added to raise the interrupt outside of the past path.
Please change if you see fit.
Thanks,
Eelco
> Thanks,
> Maxime
>
>> Thanks,
>> Chenbo
next prev parent reply other threads:[~2023-05-31 11:21 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-17 9:08 [PATCH v3 0/4] " Eelco Chaudron
2023-05-17 9:08 ` [PATCH v3 1/4] vhost: change vhost_virtqueue access lock to a read/write one Eelco Chaudron
2023-05-17 17:33 ` Maxime Coquelin
2023-05-18 14:46 ` Eelco Chaudron
2023-05-31 6:37 ` Xia, Chenbo
2023-05-31 9:27 ` Maxime Coquelin
2023-05-31 11:13 ` Eelco Chaudron
2023-06-01 1:45 ` Xia, Chenbo
2023-05-17 9:08 ` [PATCH v3 2/4] vhost: make the guest_notifications statistic counter atomic Eelco Chaudron
2023-05-30 12:52 ` Maxime Coquelin
2023-05-31 7:03 ` Xia, Chenbo
2023-05-17 9:09 ` [PATCH v3 3/4] vhost: fix invalid call FD handling Eelco Chaudron
2023-05-30 12:54 ` Maxime Coquelin
2023-05-31 6:12 ` Xia, Chenbo
2023-05-31 9:30 ` Maxime Coquelin
2023-05-17 9:09 ` [PATCH v3 4/4] vhost: add device op to offload the interrupt kick Eelco Chaudron
2023-05-30 13:02 ` Maxime Coquelin
2023-05-30 13:16 ` Thomas Monjalon
2023-05-30 15:16 ` Maxime Coquelin
2023-05-31 6:19 ` Xia, Chenbo
2023-05-31 9:29 ` Maxime Coquelin
2023-05-31 11:21 ` Eelco Chaudron [this message]
2023-06-01 2:18 ` Xia, Chenbo
2023-06-01 8:15 ` Eelco Chaudron
2023-06-01 8:29 ` Maxime Coquelin
2023-06-01 8:49 ` Eelco Chaudron
2023-06-01 8:53 ` Maxime Coquelin
2023-05-31 11:49 ` David Marchand
2023-05-31 12:01 ` David Marchand
2023-05-31 12:48 ` Maxime Coquelin
2023-05-31 13:13 ` Eelco Chaudron
2023-05-31 14:12 ` David Marchand
2023-05-31 14:18 ` Maxime Coquelin
2023-06-01 20:00 ` [PATCH v3 0/4] " Maxime Coquelin
2023-06-02 6:20 ` Eelco Chaudron
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