From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 21F47A2EFC for ; Wed, 18 Sep 2019 15:11:39 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id DBC381C2DB; Wed, 18 Sep 2019 15:11:38 +0200 (CEST) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id AB7E51C2DA for ; Wed, 18 Sep 2019 15:11:37 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 136753061424; Wed, 18 Sep 2019 13:11:37 +0000 (UTC) Received: from [10.36.112.23] (ovpn-112-23.ams2.redhat.com [10.36.112.23]) by smtp.corp.redhat.com (Postfix) with ESMTPS id EA6B85D6A5; Wed, 18 Sep 2019 13:11:32 +0000 (UTC) To: Eelco Chaudron , tiwei.bie@intel.com, zhihong.wang@intel.com Cc: dev@dpdk.org References: <25d9aeb9ba061b45d394081cc0cc7a347f7dfb2e.1567003335.git.echaudro@redhat.com> From: Maxime Coquelin Openpgp: preference=signencrypt Autocrypt: addr=maxime.coquelin@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <25d9aeb9ba061b45d394081cc0cc7a347f7dfb2e.1567003335.git.echaudro@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Wed, 18 Sep 2019 13:11:37 +0000 (UTC) Subject: Re: [dpdk-dev] [PATCH] vhost: add device opr when notification to guest is sent X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 8/28/19 4:49 PM, Eelco Chaudron wrote: > This patch adds an operation callback which gets called every time > the library is waking up the guest trough an eventfd_write() call. > > This can be used by 3rd party application, like OVS, to track the > number of times interrupts where generated. This might be of > interest to find out system-call were called in the fast path. > > Signed-off-by: Eelco Chaudron > --- > lib/librte_vhost/rte_vhost.h | 10 +++++++++- > lib/librte_vhost/vhost.h | 15 ++++++++++++--- > 2 files changed, 21 insertions(+), 4 deletions(-) > > diff --git a/lib/librte_vhost/rte_vhost.h b/lib/librte_vhost/rte_vhost.h > index 7fb1729..878e339 100644 > --- a/lib/librte_vhost/rte_vhost.h > +++ b/lib/librte_vhost/rte_vhost.h > @@ -172,7 +172,15 @@ struct vhost_device_ops { > int (*new_connection)(int vid); > void (*destroy_connection)(int vid); > > - void *reserved[2]; /**< Reserved for future extension */ > + /** > + * This callback gets called each time a guest gets notified > + * about waiting packets. This is the interrupt handling trough > + * the eventfd_write(callfd), which can be used for counting these > + * "slow" syscalls. > + */ > + void (*guest_notified)(int vid); > + > + void *reserved[1]; /**< Reserved for future extension */ > }; > > /** > diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h > index 884befa..5131a97 100644 > --- a/lib/librte_vhost/vhost.h > +++ b/lib/librte_vhost/vhost.h > @@ -543,13 +543,19 @@ void *vhost_alloc_copy_ind_table(struct virtio_net *dev, > > if ((vhost_need_event(vhost_used_event(vq), new, old) && > (vq->callfd >= 0)) || > - unlikely(!signalled_used_valid)) > + unlikely(!signalled_used_valid)) { > eventfd_write(vq->callfd, (eventfd_t) 1); > + if (dev->notify_ops->guest_notified) > + dev->notify_ops->guest_notified(dev->vid); > + } > } else { > /* Kick the guest if necessary. */ > if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT) > - && (vq->callfd >= 0)) > + && (vq->callfd >= 0)) { > eventfd_write(vq->callfd, (eventfd_t)1); > + if (dev->notify_ops->guest_notified) > + dev->notify_ops->guest_notified(dev->vid); > + } > } > } > > @@ -600,8 +606,11 @@ void *vhost_alloc_copy_ind_table(struct virtio_net *dev, > if (vhost_need_event(off, new, old)) > kick = true; > kick: > - if (kick) > + if (kick) { > eventfd_write(vq->callfd, (eventfd_t)1); > + if (dev->notify_ops->guest_notified) > + dev->notify_ops->guest_notified(dev->vid); > + } > } > > static __rte_always_inline void > Applied to dpdk-next-virtio/master. Thanks, Maxime