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[79.17.248.175]) by smtp.gmail.com with ESMTPSA id t184sm3757163wmt.13.2020.12.04.07.20.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Dec 2020 07:20:46 -0800 (PST) Date: Fri, 4 Dec 2020 16:20:43 +0100 From: Stefano Garzarella To: Jason Wang Cc: mst@redhat.com, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, shahafs@mellanox.com Subject: Re: [PATCH V2 19/19] vdpa: introduce virtio pci driver Message-ID: <20201204152043.ewqlwviaf33wwiyx@steredhat> References: <20201204040353.21679-1-jasowang@redhat.com> <20201204040353.21679-20-jasowang@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20201204040353.21679-20-jasowang@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 04, 2020 at 12:03:53PM +0800, Jason Wang wrote: >This patch introduce a vDPA driver for virtio-pci device. It bridges >the virtio-pci control command to the vDPA bus. This will be used for >features prototyping and testing. > >Note that get/restore virtqueue state is not supported which needs >extension on the virtio specification. > >Signed-off-by: Jason Wang >--- > drivers/vdpa/Kconfig | 6 + > drivers/vdpa/Makefile | 1 + > drivers/vdpa/virtio_pci/Makefile | 2 + > drivers/vdpa/virtio_pci/vp_vdpa.c | 455 ++++++++++++++++++++++++++++++ > 4 files changed, 464 insertions(+) > create mode 100644 drivers/vdpa/virtio_pci/Makefile > create mode 100644 drivers/vdpa/virtio_pci/vp_vdpa.c > >diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig >index 358f6048dd3c..18cad14f533e 100644 >--- a/drivers/vdpa/Kconfig >+++ b/drivers/vdpa/Kconfig >@@ -48,4 +48,10 @@ config MLX5_VDPA_NET > be executed by the hardware. It also supports a variety of stateless > offloads depending on the actual device used and firmware version. > >+config VP_VDPA >+ tristate "Virtio PCI bridge vDPA driver" >+ depends on PCI_MSI && VIRTIO_PCI_MODERN >+ help >+ This kernel module that bridges virtio PCI device to vDPA bus. ^ Without 'that' maybe sound better, but I'm not a native speaker :-) >+ > endif # VDPA >diff --git a/drivers/vdpa/Makefile b/drivers/vdpa/Makefile >index d160e9b63a66..67fe7f3d6943 100644 >--- a/drivers/vdpa/Makefile >+++ b/drivers/vdpa/Makefile >@@ -3,3 +3,4 @@ obj-$(CONFIG_VDPA) += vdpa.o > obj-$(CONFIG_VDPA_SIM) += vdpa_sim/ > obj-$(CONFIG_IFCVF) += ifcvf/ > obj-$(CONFIG_MLX5_VDPA) += mlx5/ >+obj-$(CONFIG_VP_VDPA) += virtio_pci/ >diff --git a/drivers/vdpa/virtio_pci/Makefile b/drivers/vdpa/virtio_pci/Makefile >new file mode 100644 >index 000000000000..231088d3af7d >--- /dev/null >+++ b/drivers/vdpa/virtio_pci/Makefile >@@ -0,0 +1,2 @@ >+# SPDX-License-Identifier: GPL-2.0 >+obj-$(CONFIG_VP_VDPA) += vp_vdpa.o >diff --git a/drivers/vdpa/virtio_pci/vp_vdpa.c b/drivers/vdpa/virtio_pci/vp_vdpa.c >new file mode 100644 >index 000000000000..fa0321e77fb3 >--- /dev/null >+++ b/drivers/vdpa/virtio_pci/vp_vdpa.c >@@ -0,0 +1,455 @@ >+// SPDX-License-Identifier: GPL-2.0-only >+/* >+ * vDPA bridge driver for modern virtio-pci device >+ * >+ * Copyright (c) 2020, Red Hat Inc. All rights reserved. >+ * Author: Jason Wang >+ * >+ * Based on virtio_pci_modern.c. >+ */ >+ >+#include >+#include >+#include >+#include >+#include >+#include >+#include >+#include >+#include >+ >+#define VP_VDPA_QUEUE_MAX 256 >+#define VP_VDPA_DRIVER_NAME "vp_vdpa" >+ >+struct vp_vring { >+ void __iomem *notify; >+ char msix_name[256]; Can we use a macro for the msix_name size, since we use 256 in multiple places? >+ struct vdpa_callback cb; >+ int irq; >+}; >+ >+struct vp_vdpa { >+ struct vdpa_device vdpa; >+ struct virtio_pci_modern_device mdev; >+ struct vp_vring *vring; >+ struct vdpa_callback cb; ^ It is not relevant, but 'config_cb' is maybe clearer to read. The rest looks good. Thanks, Stefano >+ char msix_name[256]; >+ int config_irq; >+ int queues; >+ int vectors; >+}; >+ >+static struct vp_vdpa *vdpa_to_vp(struct vdpa_device *vdpa) >+{ >+ return container_of(vdpa, struct vp_vdpa, vdpa); >+} >+ >+static struct virtio_pci_modern_device *vdpa_to_mdev(struct vdpa_device *vdpa) >+{ >+ struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa); >+ >+ return &vp_vdpa->mdev; >+} >+ >+static u64 vp_vdpa_get_features(struct vdpa_device *vdpa) >+{ >+ struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa); >+ >+ return vp_modern_get_features(mdev); >+} >+ >+static int vp_vdpa_set_features(struct vdpa_device *vdpa, u64 features) >+{ >+ struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa); >+ >+ vp_modern_set_features(mdev, features); >+ >+ return 0; >+} >+ >+static u8 vp_vdpa_get_status(struct vdpa_device *vdpa) >+{ >+ struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa); >+ >+ return vp_modern_get_status(mdev); >+} >+ >+static void vp_vdpa_free_irq(struct vp_vdpa *vp_vdpa) >+{ >+ struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev; >+ struct pci_dev *pdev = mdev->pci_dev; >+ int i; >+ >+ for (i = 0; i < vp_vdpa->queues; i++) { >+ if (vp_vdpa->vring[i].irq != VIRTIO_MSI_NO_VECTOR) { >+ vp_modern_queue_vector(mdev, i, VIRTIO_MSI_NO_VECTOR); >+ devm_free_irq(&pdev->dev, vp_vdpa->vring[i].irq, >+ &vp_vdpa->vring[i]); >+ vp_vdpa->vring[i].irq = VIRTIO_MSI_NO_VECTOR; >+ } >+ } >+ >+ if (vp_vdpa->config_irq != VIRTIO_MSI_NO_VECTOR) { >+ vp_modern_config_vector(mdev, VIRTIO_MSI_NO_VECTOR); >+ devm_free_irq(&pdev->dev, vp_vdpa->config_irq, vp_vdpa); >+ vp_vdpa->config_irq = VIRTIO_MSI_NO_VECTOR; >+ } >+ >+ if (vp_vdpa->vectors) { >+ pci_free_irq_vectors(pdev); >+ vp_vdpa->vectors = 0; >+ } >+} >+ >+static irqreturn_t vp_vdpa_vq_handler(int irq, void *arg) >+{ >+ struct vp_vring *vring = arg; >+ >+ if (vring->cb.callback) >+ return vring->cb.callback(vring->cb.private); >+ >+ return IRQ_HANDLED; >+} >+ >+static irqreturn_t vp_vdpa_config_handler(int irq, void *arg) >+{ >+ struct vp_vdpa *vp_vdpa = arg; >+ >+ if (vp_vdpa->cb.callback) >+ return vp_vdpa->cb.callback(vp_vdpa->cb.private); >+ >+ return IRQ_HANDLED; >+} >+ >+static int vp_vdpa_request_irq(struct vp_vdpa *vp_vdpa) >+{ >+ struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev; >+ struct pci_dev *pdev = mdev->pci_dev; >+ int i, ret, irq; >+ int queues = vp_vdpa->queues; >+ int vectors = queues + 1; >+ >+ ret = pci_alloc_irq_vectors(pdev, vectors, vectors, PCI_IRQ_MSIX); >+ if (ret != vectors) { >+ dev_err(&pdev->dev, >+ "vp_vdpa: fail to allocate irq vectors want %d but %d\n", >+ vectors, ret); >+ return ret; >+ } >+ >+ vp_vdpa->vectors = vectors; >+ >+ for (i = 0; i < queues; i++) { >+ snprintf(vp_vdpa->vring[i].msix_name, 256, >+ "vp-vdpa[%s]-%d\n", pci_name(pdev), i); >+ irq = pci_irq_vector(pdev, i); >+ ret = devm_request_irq(&pdev->dev, irq, >+ vp_vdpa_vq_handler, >+ 0, vp_vdpa->vring[i].msix_name, >+ &vp_vdpa->vring[i]); >+ if (ret) { >+ dev_err(&pdev->dev, >+ "vp_vdpa: fail to request irq for vq %d\n", i); >+ goto err; >+ } >+ vp_modern_queue_vector(mdev, i, i); >+ vp_vdpa->vring[i].irq = irq; >+ } >+ >+ snprintf(vp_vdpa->msix_name, 256, "vp-vdpa[%s]-config\n", >+ pci_name(pdev)); >+ irq = pci_irq_vector(pdev, queues); >+ ret = devm_request_irq(&pdev->dev, irq, vp_vdpa_config_handler, 0, >+ vp_vdpa->msix_name, vp_vdpa); >+ if (ret) { >+ dev_err(&pdev->dev, >+ "vp_vdpa: fail to request irq for vq %d\n", i); >+ goto err; >+ } >+ vp_modern_config_vector(mdev, queues); >+ vp_vdpa->config_irq = irq; >+ >+ return 0; >+err: >+ vp_vdpa_free_irq(vp_vdpa); >+ return ret; >+} >+ >+static void vp_vdpa_set_status(struct vdpa_device *vdpa, u8 status) >+{ >+ struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa); >+ struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev; >+ u8 s = vp_vdpa_get_status(vdpa); >+ >+ if (status & VIRTIO_CONFIG_S_DRIVER_OK && >+ !(s & VIRTIO_CONFIG_S_DRIVER_OK)) { >+ vp_vdpa_request_irq(vp_vdpa); >+ } >+ >+ vp_modern_set_status(mdev, status); >+ >+ if (!(status & VIRTIO_CONFIG_S_DRIVER_OK) && >+ (s & VIRTIO_CONFIG_S_DRIVER_OK)) >+ vp_vdpa_free_irq(vp_vdpa); >+} >+ >+static u16 vp_vdpa_get_vq_num_max(struct vdpa_device *vdpa) >+{ >+ return VP_VDPA_QUEUE_MAX; >+} >+ >+static int vp_vdpa_get_vq_state(struct vdpa_device *vdpa, u16 qid, >+ struct vdpa_vq_state *state) >+{ >+ /* Note that this is not supported by virtio specification, so >+ * we return -EOPNOTSUPP here. This means we can't support live >+ * migration, vhost device start/stop. >+ */ >+ return -EOPNOTSUPP; >+} >+ >+static int vp_vdpa_set_vq_state(struct vdpa_device *vdpa, u16 qid, >+ const struct vdpa_vq_state *state) >+{ >+ /* Note that this is not supported by virtio specification, so >+ * we return -ENOPOTSUPP here. This means we can't support live >+ * migration, vhost device start/stop. >+ */ >+ return -EOPNOTSUPP; >+} >+ >+static void vp_vdpa_set_vq_cb(struct vdpa_device *vdpa, u16 qid, >+ struct vdpa_callback *cb) >+{ >+ struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa); >+ >+ vp_vdpa->vring[qid].cb = *cb; >+} >+ >+static void vp_vdpa_set_vq_ready(struct vdpa_device *vdpa, >+ u16 qid, bool ready) >+{ >+ struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa); >+ >+ vp_modern_set_queue_enable(mdev, qid, ready); >+} >+ >+static bool vp_vdpa_get_vq_ready(struct vdpa_device *vdpa, u16 qid) >+{ >+ struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa); >+ >+ return vp_modern_get_queue_enable(mdev, qid); >+} >+ >+static void vp_vdpa_set_vq_num(struct vdpa_device *vdpa, u16 qid, >+ u32 num) >+{ >+ struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa); >+ >+ vp_modern_set_queue_size(mdev, qid, num); >+} >+ >+static int vp_vdpa_set_vq_address(struct vdpa_device *vdpa, u16 qid, >+ u64 desc_area, u64 driver_area, >+ u64 device_area) >+{ >+ struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa); >+ >+ vp_modern_queue_address(mdev, qid, desc_area, >+ driver_area, device_area); >+ >+ return 0; >+} >+ >+static void vp_vdpa_kick_vq(struct vdpa_device *vdpa, u16 qid) >+{ >+ struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa); >+ >+ vp_iowrite16(qid, vp_vdpa->vring[qid].notify); >+} >+ >+static u32 vp_vdpa_get_generation(struct vdpa_device *vdpa) >+{ >+ struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa); >+ >+ return vp_modern_generation(mdev); >+} >+ >+static u32 vp_vdpa_get_device_id(struct vdpa_device *vdpa) >+{ >+ struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa); >+ >+ return mdev->id.device; >+} >+ >+static u32 vp_vdpa_get_vendor_id(struct vdpa_device *vdpa) >+{ >+ struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa); >+ >+ return mdev->id.vendor; >+} >+ >+static u32 vp_vdpa_get_vq_align(struct vdpa_device *vdpa) >+{ >+ return PAGE_SIZE; >+} >+ >+static void vp_vdpa_get_config(struct vdpa_device *vdpa, >+ unsigned int offset, >+ void *buf, unsigned int len) >+{ >+ struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa); >+ struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev; >+ u8 old, new; >+ u8 *p; >+ int i; >+ >+ do { >+ old = vp_ioread8(&mdev->common->config_generation); >+ p = buf; >+ for (i = 0; i < len; i++) >+ *p++ = vp_ioread8(mdev->device + offset + i); >+ >+ new = vp_ioread8(&mdev->common->config_generation); >+ } while (old != new); >+} >+ >+static void vp_vdpa_set_config(struct vdpa_device *vdpa, >+ unsigned int offset, const void *buf, >+ unsigned int len) >+{ >+ struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa); >+ struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev; >+ const u8 *p = buf; >+ int i; >+ >+ for (i = 0; i < len; i++) >+ vp_iowrite8(*p++, mdev->device + offset + i); >+} >+ >+static void vp_vdpa_set_config_cb(struct vdpa_device *vdpa, >+ struct vdpa_callback *cb) >+{ >+ struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa); >+ >+ vp_vdpa->cb = *cb; >+} >+ >+static const struct vdpa_config_ops vp_vdpa_ops = { >+ .get_features = vp_vdpa_get_features, >+ .set_features = vp_vdpa_set_features, >+ .get_status = vp_vdpa_get_status, >+ .set_status = vp_vdpa_set_status, >+ .get_vq_num_max = vp_vdpa_get_vq_num_max, >+ .get_vq_state = vp_vdpa_get_vq_state, >+ .set_vq_state = vp_vdpa_set_vq_state, >+ .set_vq_cb = vp_vdpa_set_vq_cb, >+ .set_vq_ready = vp_vdpa_set_vq_ready, >+ .get_vq_ready = vp_vdpa_get_vq_ready, >+ .set_vq_num = vp_vdpa_set_vq_num, >+ .set_vq_address = vp_vdpa_set_vq_address, >+ .kick_vq = vp_vdpa_kick_vq, >+ .get_generation = vp_vdpa_get_generation, >+ .get_device_id = vp_vdpa_get_device_id, >+ .get_vendor_id = vp_vdpa_get_vendor_id, >+ .get_vq_align = vp_vdpa_get_vq_align, >+ .get_config = vp_vdpa_get_config, >+ .set_config = vp_vdpa_set_config, >+ .set_config_cb = vp_vdpa_set_config_cb, >+}; >+ >+static void vp_vdpa_free_irq_vectors(void *data) >+{ >+ pci_free_irq_vectors(data); >+} >+ >+static int vp_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id >*id) >+{ >+ struct virtio_pci_modern_device *mdev; >+ struct device *dev = &pdev->dev; >+ struct vp_vdpa *vp_vdpa; >+ u16 notify_off; >+ int ret, i; >+ >+ ret = pcim_enable_device(pdev); >+ if (ret) >+ return ret; >+ >+ vp_vdpa = vdpa_alloc_device(struct vp_vdpa, vdpa, >+ dev, &vp_vdpa_ops); >+ if (vp_vdpa == NULL) { >+ dev_err(dev, "vp_vdpa: Failed to allocate vDPA structure\n"); >+ return -ENOMEM; >+ } >+ >+ mdev = &vp_vdpa->mdev; >+ mdev->pci_dev = pdev; >+ >+ if (vp_modern_probe(mdev)) { >+ dev_err(&pdev->dev, "Failed to probe modern PCI device\n"); >+ goto err; >+ } >+ >+ pci_set_master(pdev); >+ pci_set_drvdata(pdev, vp_vdpa); >+ >+ vp_vdpa->vdpa.dma_dev = &pdev->dev; >+ vp_vdpa->queues = vp_modern_get_num_queues(mdev); >+ >+ ret = devm_add_action_or_reset(dev, vp_vdpa_free_irq_vectors, pdev); >+ if (ret) { >+ dev_err(&pdev->dev, >+ "Failed for adding devres for freeing irq vectors\n"); >+ goto err; >+ } >+ >+ vp_vdpa->vring = devm_kcalloc(&pdev->dev, vp_vdpa->queues, >+ sizeof(*vp_vdpa->vring), >+ GFP_KERNEL); >+ if (!vp_vdpa->vring) { >+ dev_err(&pdev->dev, "Fail to allocate virtqueues\n"); >+ goto err; >+ } >+ >+ for (i = 0; i < vp_vdpa->queues; i++) { >+ notify_off = vp_modern_get_queue_notify_off(mdev, i); >+ vp_vdpa->vring[i].irq = VIRTIO_MSI_NO_VECTOR; >+ vp_vdpa->vring[i].notify = mdev->notify_base + >+ notify_off * mdev->notify_offset_multiplier; >+ } >+ vp_vdpa->config_irq = VIRTIO_MSI_NO_VECTOR; >+ >+ ret = vdpa_register_device(&vp_vdpa->vdpa, vp_vdpa->queues); >+ if (ret) { >+ dev_err(&pdev->dev, "Failed to register to vdpa bus\n"); >+ goto err; >+ } >+ >+ return 0; >+ >+err: >+ put_device(&vp_vdpa->vdpa.dev); >+ return ret; >+} >+ >+static void vp_vdpa_remove(struct pci_dev *pdev) >+{ >+ struct vp_vdpa *vp_vdpa = pci_get_drvdata(pdev); >+ >+ vdpa_unregister_device(&vp_vdpa->vdpa); >+ vp_modern_remove(&vp_vdpa->mdev); >+} >+ >+static struct pci_driver vp_vdpa_driver = { >+ .name = "vp-vdpa", >+ .id_table = NULL, /* only dynamic ids */ >+ .probe = vp_vdpa_probe, >+ .remove = vp_vdpa_remove, >+}; >+ >+module_pci_driver(vp_vdpa_driver); >+ >+MODULE_AUTHOR("Jason Wang "); >+MODULE_DESCRIPTION("vp-vdpa"); >+MODULE_LICENSE("GPL"); >+MODULE_VERSION("1"); >-- >2.25.1 > >_______________________________________________ >Virtualization mailing list >Virtualization@lists.linux-foundation.org >https://lists.linuxfoundation.org/mailman/listinfo/virtualization >