From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 4E97B42C01; Thu, 1 Jun 2023 10:53:09 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id DAF2B406B3; Thu, 1 Jun 2023 10:53:08 +0200 (CEST) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by mails.dpdk.org (Postfix) with ESMTP id 3EE72406A2 for ; Thu, 1 Jun 2023 10:53:07 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1685609586; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lw4AYhc4RV88UG9uscx+DC06QjjWomK7Yer5D0uAokc=; b=OXG2jkyvAW3iv8n/tUgs57Yz3mq/Qliz32Oc2w16mrkUva8vfC0K4DzT6dvBM5el93UFJl ytGeEfaKfxrwiN/jniWrcDWD1gfJN7zjxRYYXh5/4pzO7EKijfipyfHmEdA25gtXo4JaDY lIzKlUMlBZ2i54NPcmOvS4sF5FbH/1w= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-557-9AlJnSLJOY-fs2zUvf9aiw-1; Thu, 01 Jun 2023 04:53:03 -0400 X-MC-Unique: 9AlJnSLJOY-fs2zUvf9aiw-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 4EB9C29DD98B; Thu, 1 Jun 2023 08:53:03 +0000 (UTC) Received: from [10.39.208.25] (unknown [10.39.208.25]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D43A040CF8EA; Thu, 1 Jun 2023 08:53:01 +0000 (UTC) Message-ID: <9da1b0b3-d790-976e-37cd-4f07aff588f3@redhat.com> Date: Thu, 1 Jun 2023 10:53:00 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [PATCH v3 4/4] vhost: add device op to offload the interrupt kick To: Eelco Chaudron Cc: "Xia, Chenbo" , Thomas Monjalon , david.marchand@redhat.com, dev@dpdk.org References: <168431450017.558450.16680518469610688737.stgit@ebuild.local> <168431455219.558450.14986601389394385835.stgit@ebuild.local> <49ec9930-66b8-fc95-72ad-5cb012ed8635@redhat.com> <16690234.Ash8RoxBsO@thomas> <7f1be920-0318-ae7f-4c2e-cc08b2083f7c@redhat.com> <11c40eca-5847-dfb4-470d-7da86fe7e51e@redhat.com> <16467869-9918-2526-1435-acf4615f9ba3@redhat.com> <59B251C3-BC62-43E2-916D-45708431D179@redhat.com> From: Maxime Coquelin In-Reply-To: <59B251C3-BC62-43E2-916D-45708431D179@redhat.com> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org On 6/1/23 10:49, Eelco Chaudron wrote: > > > On 1 Jun 2023, at 10:29, Maxime Coquelin wrote: > >> On 6/1/23 10:15, Eelco Chaudron wrote: >>> >>> >>> On 1 Jun 2023, at 4:18, Xia, Chenbo wrote: >>> >>>>> -----Original Message----- >>>>> From: Maxime Coquelin >>>>> Sent: Wednesday, May 31, 2023 5:29 PM >>>>> To: Xia, Chenbo ; Thomas Monjalon >>>>> ; Eelco Chaudron ; >>>>> david.marchand@redhat.com >>>>> Cc: dev@dpdk.org >>>>> Subject: Re: [PATCH v3 4/4] vhost: add device op to offload the interrupt >>>>> kick >>>>> >>>>> >>>>> >>>>> On 5/31/23 08:19, Xia, Chenbo wrote: >>>>>>> -----Original Message----- >>>>>>> From: Maxime Coquelin >>>>>>> Sent: Tuesday, May 30, 2023 11:17 PM >>>>>>> To: Thomas Monjalon ; Eelco Chaudron >>>>>>> ; Xia, Chenbo ; >>>>>>> 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 >>>>>>>>>> --- >>>>>>>>>> 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 >>>>>>>>> >>>>>>>>> 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). >>>> >>>> Btw, the vhost_lib.rst also needs a new item.. >>> >>> What about the following? >>> >>> diff --git a/doc/guides/prog_guide/vhost_lib.rst b/doc/guides/prog_guide/vhost_lib.rst >>> index e8bb8c9b7b..0f964d7a4a 100644 >>> --- a/doc/guides/prog_guide/vhost_lib.rst >>> +++ b/doc/guides/prog_guide/vhost_lib.rst >>> @@ -334,6 +334,11 @@ The following is an overview of some key Vhost API functions: >>> Clean DMA vChannel finished to use. After this function is called, >>> the specified DMA vChannel should no longer be used by the Vhost library. >>> >>> +* ``rte_vhost_notify_guest(int vid, uint16_t queue_id)`` >>> + >>> + Inject the offloaded interrupt received by the 'guest_notify' callback, >>> + into the vhost device's queue. >>> + >>> Vhost-user Implementations >>> -------------------------- >>> >>> Maxime do you want to add it, or do you want a new rev? >> >> That's fine, I just added it now :) Can you check the next-virtio main >> branch and confirm all is OK for your series? >> >> https://git.dpdk.org/next/dpdk-next-virtio/log/ >> > > One small spelling issue, the rest looks good: > > +* **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. > > Last sentence spells ‘past path’ instead of ‘fast path’. I edited the line but it didn't caught my eye! Fixing it now. Thanks, Maxime > >> Thanks, >> Maxime >> >>> >>>> Thanks, >>>> Chenbo >>>> >>>>> >>>>> Thanks, >>>>> Maxime >>>>> >>>>>> Thanks, >>>>>> Chenbo >>> >