From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752621AbeE3MlM (ORCPT ); Wed, 30 May 2018 08:41:12 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:33338 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751447AbeE3MlL (ORCPT ); Wed, 30 May 2018 08:41:11 -0400 Date: Wed, 30 May 2018 15:41:09 +0300 From: "Michael S. Tsirkin" To: Tiwei Bie Cc: bhelgaas@google.com, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, virtio-dev@lists.oasis-open.org, linux-pci@vger.kernel.org, dan.daly@intel.com, mark.d.rustad@intel.com, alexander.h.duyck@intel.com, cunming.liang@intel.com, zhihong.wang@intel.com Subject: Re: [PATCH] virtio_pci: support enabling VFs Message-ID: <20180530152534-mutt-send-email-mst@kernel.org> References: <20180530085521.26583-1-tiwei.bie@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180530085521.26583-1-tiwei.bie@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 30, 2018 at 04:55:21PM +0800, Tiwei Bie wrote: > There is a new feature bit allocated in virtio spec to > support SR-IOV (Single Root I/O Virtualization): > > https://github.com/oasis-tcs/virtio-spec/issues/11 > > This patch enables the support for this feature bit in > virtio driver. > > Signed-off-by: Tiwei Bie Acked-by: Michael S. Tsirkin > --- > This patch depends on below proposal: > https://lists.oasis-open.org/archives/virtio-dev/201805/msg00154.html > > This patch depends on below patch: > https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?h=pci/virtualization&id=8effc395c2097e258fcedfc02ed4a66d45fb4238 > > drivers/virtio/virtio_pci_common.c | 20 ++++++++++++++++++++ > drivers/virtio/virtio_pci_modern.c | 14 ++++++++++++++ > include/uapi/linux/virtio_config.h | 7 ++++++- > 3 files changed, 40 insertions(+), 1 deletion(-) > > diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c > index 48d4d1cf1cb6..023da80a7a3e 100644 > --- a/drivers/virtio/virtio_pci_common.c > +++ b/drivers/virtio/virtio_pci_common.c > @@ -588,6 +588,25 @@ static void virtio_pci_remove(struct pci_dev *pci_dev) > put_device(dev); > } > > +static int virtio_pci_sriov_configure(struct pci_dev *pci_dev, int num_vfs) > +{ > + struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); > + struct virtio_device *vdev = &vp_dev->vdev; > + int (*sriov_configure)(struct pci_dev *pci_dev, int num_vfs); > + > + if (!(vdev->config->get_status(vdev) & VIRTIO_CONFIG_S_DRIVER_OK)) > + return -EBUSY; > + > + if (!__virtio_test_bit(vdev, VIRTIO_F_SR_IOV)) > + return -EINVAL; > + > + sriov_configure = pci_sriov_configure_simple; > + if (sriov_configure == NULL) > + return -ENOENT; > + > + return sriov_configure(pci_dev, num_vfs); > +} > + > static struct pci_driver virtio_pci_driver = { > .name = "virtio-pci", > .id_table = virtio_pci_id_table, > @@ -596,6 +615,7 @@ static struct pci_driver virtio_pci_driver = { > #ifdef CONFIG_PM_SLEEP > .driver.pm = &virtio_pci_pm_ops, > #endif > + .sriov_configure = virtio_pci_sriov_configure, > }; > > module_pci_driver(virtio_pci_driver); > diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c > index 2555d80f6eec..07571daccfec 100644 > --- a/drivers/virtio/virtio_pci_modern.c > +++ b/drivers/virtio/virtio_pci_modern.c > @@ -153,14 +153,28 @@ static u64 vp_get_features(struct virtio_device *vdev) > return features; > } > > +static void vp_transport_features(struct virtio_device *vdev, u64 features) > +{ > + struct virtio_pci_device *vp_dev = to_vp_device(vdev); > + struct pci_dev *pci_dev = vp_dev->pci_dev; > + > + if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) && > + pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV)) > + __virtio_set_bit(vdev, VIRTIO_F_SR_IOV); > +} > + > /* virtio config->finalize_features() implementation */ > static int vp_finalize_features(struct virtio_device *vdev) > { > struct virtio_pci_device *vp_dev = to_vp_device(vdev); > + u64 features = vdev->features; > > /* Give virtio_ring a chance to accept features. */ > vring_transport_features(vdev); > > + /* Give virtio_pci a chance to accept features. */ > + vp_transport_features(vdev, features); > + > if (!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { > dev_err(&vdev->dev, "virtio: device uses modern interface " > "but does not have VIRTIO_F_VERSION_1\n"); > diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h > index 308e2096291f..b7c1f4e7d59e 100644 > --- a/include/uapi/linux/virtio_config.h > +++ b/include/uapi/linux/virtio_config.h > @@ -49,7 +49,7 @@ > * transport being used (eg. virtio_ring), the rest are per-device feature > * bits. */ > #define VIRTIO_TRANSPORT_F_START 28 > -#define VIRTIO_TRANSPORT_F_END 34 > +#define VIRTIO_TRANSPORT_F_END 38 > > #ifndef VIRTIO_CONFIG_NO_LEGACY > /* Do we get callbacks when the ring is completely used, even if we've > @@ -71,4 +71,9 @@ > * this is for compatibility with legacy systems. > */ > #define VIRTIO_F_IOMMU_PLATFORM 33 > + > +/* > + * Does the device support Single Root I/O Virtualization? > + */ > +#define VIRTIO_F_SR_IOV 37 > #endif /* _UAPI_LINUX_VIRTIO_CONFIG_H */ > -- > 2.17.0 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: virtio-dev-return-4202-cohuck=redhat.com@lists.oasis-open.org Sender: List-Post: List-Help: List-Unsubscribe: List-Subscribe: Received: from lists.oasis-open.org (oasis-open.org [66.179.20.138]) by lists.oasis-open.org (Postfix) with ESMTP id C93BA5819120 for ; Wed, 30 May 2018 05:41:21 -0700 (PDT) Date: Wed, 30 May 2018 15:41:09 +0300 From: "Michael S. Tsirkin" Message-ID: <20180530152534-mutt-send-email-mst@kernel.org> References: <20180530085521.26583-1-tiwei.bie@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180530085521.26583-1-tiwei.bie@intel.com> Subject: [virtio-dev] Re: [PATCH] virtio_pci: support enabling VFs To: Tiwei Bie Cc: bhelgaas@google.com, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, virtio-dev@lists.oasis-open.org, linux-pci@vger.kernel.org, dan.daly@intel.com, mark.d.rustad@intel.com, alexander.h.duyck@intel.com, cunming.liang@intel.com, zhihong.wang@intel.com List-ID: On Wed, May 30, 2018 at 04:55:21PM +0800, Tiwei Bie wrote: > There is a new feature bit allocated in virtio spec to > support SR-IOV (Single Root I/O Virtualization): > > https://github.com/oasis-tcs/virtio-spec/issues/11 > > This patch enables the support for this feature bit in > virtio driver. > > Signed-off-by: Tiwei Bie Acked-by: Michael S. Tsirkin > --- > This patch depends on below proposal: > https://lists.oasis-open.org/archives/virtio-dev/201805/msg00154.html > > This patch depends on below patch: > https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?h=pci/virtualization&id=8effc395c2097e258fcedfc02ed4a66d45fb4238 > > drivers/virtio/virtio_pci_common.c | 20 ++++++++++++++++++++ > drivers/virtio/virtio_pci_modern.c | 14 ++++++++++++++ > include/uapi/linux/virtio_config.h | 7 ++++++- > 3 files changed, 40 insertions(+), 1 deletion(-) > > diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c > index 48d4d1cf1cb6..023da80a7a3e 100644 > --- a/drivers/virtio/virtio_pci_common.c > +++ b/drivers/virtio/virtio_pci_common.c > @@ -588,6 +588,25 @@ static void virtio_pci_remove(struct pci_dev *pci_dev) > put_device(dev); > } > > +static int virtio_pci_sriov_configure(struct pci_dev *pci_dev, int num_vfs) > +{ > + struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev); > + struct virtio_device *vdev = &vp_dev->vdev; > + int (*sriov_configure)(struct pci_dev *pci_dev, int num_vfs); > + > + if (!(vdev->config->get_status(vdev) & VIRTIO_CONFIG_S_DRIVER_OK)) > + return -EBUSY; > + > + if (!__virtio_test_bit(vdev, VIRTIO_F_SR_IOV)) > + return -EINVAL; > + > + sriov_configure = pci_sriov_configure_simple; > + if (sriov_configure == NULL) > + return -ENOENT; > + > + return sriov_configure(pci_dev, num_vfs); > +} > + > static struct pci_driver virtio_pci_driver = { > .name = "virtio-pci", > .id_table = virtio_pci_id_table, > @@ -596,6 +615,7 @@ static struct pci_driver virtio_pci_driver = { > #ifdef CONFIG_PM_SLEEP > .driver.pm = &virtio_pci_pm_ops, > #endif > + .sriov_configure = virtio_pci_sriov_configure, > }; > > module_pci_driver(virtio_pci_driver); > diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c > index 2555d80f6eec..07571daccfec 100644 > --- a/drivers/virtio/virtio_pci_modern.c > +++ b/drivers/virtio/virtio_pci_modern.c > @@ -153,14 +153,28 @@ static u64 vp_get_features(struct virtio_device *vdev) > return features; > } > > +static void vp_transport_features(struct virtio_device *vdev, u64 features) > +{ > + struct virtio_pci_device *vp_dev = to_vp_device(vdev); > + struct pci_dev *pci_dev = vp_dev->pci_dev; > + > + if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) && > + pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV)) > + __virtio_set_bit(vdev, VIRTIO_F_SR_IOV); > +} > + > /* virtio config->finalize_features() implementation */ > static int vp_finalize_features(struct virtio_device *vdev) > { > struct virtio_pci_device *vp_dev = to_vp_device(vdev); > + u64 features = vdev->features; > > /* Give virtio_ring a chance to accept features. */ > vring_transport_features(vdev); > > + /* Give virtio_pci a chance to accept features. */ > + vp_transport_features(vdev, features); > + > if (!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { > dev_err(&vdev->dev, "virtio: device uses modern interface " > "but does not have VIRTIO_F_VERSION_1\n"); > diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h > index 308e2096291f..b7c1f4e7d59e 100644 > --- a/include/uapi/linux/virtio_config.h > +++ b/include/uapi/linux/virtio_config.h > @@ -49,7 +49,7 @@ > * transport being used (eg. virtio_ring), the rest are per-device feature > * bits. */ > #define VIRTIO_TRANSPORT_F_START 28 > -#define VIRTIO_TRANSPORT_F_END 34 > +#define VIRTIO_TRANSPORT_F_END 38 > > #ifndef VIRTIO_CONFIG_NO_LEGACY > /* Do we get callbacks when the ring is completely used, even if we've > @@ -71,4 +71,9 @@ > * this is for compatibility with legacy systems. > */ > #define VIRTIO_F_IOMMU_PLATFORM 33 > + > +/* > + * Does the device support Single Root I/O Virtualization? > + */ > +#define VIRTIO_F_SR_IOV 37 > #endif /* _UAPI_LINUX_VIRTIO_CONFIG_H */ > -- > 2.17.0 --------------------------------------------------------------------- To unsubscribe, e-mail: virtio-dev-unsubscribe@lists.oasis-open.org For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org