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Date: Wed, 14 Dec 2022 14:45:00 +0800
From: Jason Wang <jasowang@...hat.com>
To: Gautam Dawar <gautam.dawar@....com>
Cc: linux-net-drivers@....com, netdev@...r.kernel.org,
eperezma@...hat.com, tanuj.kamde@....com, Koushik.Dutta@....com,
harpreet.anand@....com, Edward Cree <ecree.xilinx@...il.com>,
Martin Habets <habetsm.xilinx@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 06/11] sfc: implement vdpa vring config operations
On Wed, Dec 7, 2022 at 10:56 PM Gautam Dawar <gautam.dawar@....com> wrote:
>
> This patch implements the vDPA config operations related to
> virtqueues or vrings. These include setting vring address,
> getting vq state, operations to enable/disable a vq etc.
> The resources required for vring operations eg. VI, interrupts etc.
> are also allocated.
>
> Signed-off-by: Gautam Dawar <gautam.dawar@....com>
> ---
> drivers/net/ethernet/sfc/ef100_vdpa.c | 58 ++-
> drivers/net/ethernet/sfc/ef100_vdpa.h | 55 +++
> drivers/net/ethernet/sfc/ef100_vdpa_ops.c | 449 +++++++++++++++++++++-
> 3 files changed, 560 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/sfc/ef100_vdpa.c b/drivers/net/ethernet/sfc/ef100_vdpa.c
> index ff4bb61e598e..41eb7aef6798 100644
> --- a/drivers/net/ethernet/sfc/ef100_vdpa.c
> +++ b/drivers/net/ethernet/sfc/ef100_vdpa.c
> @@ -15,6 +15,7 @@
> #include "ef100_vdpa.h"
> #include "mcdi_vdpa.h"
> #include "mcdi_filters.h"
> +#include "mcdi_functions.h"
> #include "ef100_netdev.h"
>
> static struct virtio_device_id ef100_vdpa_id_table[] = {
> @@ -48,6 +49,24 @@ int ef100_vdpa_init(struct efx_probe_data *probe_data)
> return rc;
> }
>
> +static int vdpa_allocate_vis(struct efx_nic *efx, unsigned int *allocated_vis)
> +{
> + /* The first VI is reserved for MCDI
> + * 1 VI each for rx + tx ring
> + */
> + unsigned int max_vis = 1 + EF100_VDPA_MAX_QUEUES_PAIRS;
> + unsigned int min_vis = 1 + 1;
> + int rc;
> +
> + rc = efx_mcdi_alloc_vis(efx, min_vis, max_vis,
> + NULL, allocated_vis);
> + if (!rc)
> + return rc;
> + if (*allocated_vis < min_vis)
> + return -ENOSPC;
> + return 0;
> +}
> +
> static void ef100_vdpa_delete(struct efx_nic *efx)
> {
> if (efx->vdpa_nic) {
> @@ -55,6 +74,7 @@ static void ef100_vdpa_delete(struct efx_nic *efx)
> put_device(&efx->vdpa_nic->vdpa_dev.dev);
> efx->vdpa_nic = NULL;
> }
> + efx_mcdi_free_vis(efx);
> }
>
> void ef100_vdpa_fini(struct efx_probe_data *probe_data)
> @@ -106,10 +126,20 @@ static struct ef100_vdpa_nic *ef100_vdpa_create(struct efx_nic *efx,
> {
> struct ef100_nic_data *nic_data = efx->nic_data;
> struct ef100_vdpa_nic *vdpa_nic;
> + unsigned int allocated_vis;
> struct device *dev;
> int rc;
> + u8 i;
>
> nic_data->vdpa_class = dev_type;
> + rc = vdpa_allocate_vis(efx, &allocated_vis);
> + if (rc) {
> + pci_err(efx->pci_dev,
> + "%s Alloc VIs failed for vf:%u error:%d\n",
> + __func__, nic_data->vf_index, rc);
> + return ERR_PTR(rc);
> + }
> +
> vdpa_nic = vdpa_alloc_device(struct ef100_vdpa_nic,
> vdpa_dev, &efx->pci_dev->dev,
> &ef100_vdpa_config_ops,
> @@ -120,7 +150,8 @@ static struct ef100_vdpa_nic *ef100_vdpa_create(struct efx_nic *efx,
> "vDPA device allocation failed for vf: %u\n",
> nic_data->vf_index);
> nic_data->vdpa_class = EF100_VDPA_CLASS_NONE;
> - return ERR_PTR(-ENOMEM);
> + rc = -ENOMEM;
> + goto err_alloc_vis_free;
> }
>
> mutex_init(&vdpa_nic->lock);
> @@ -129,6 +160,7 @@ static struct ef100_vdpa_nic *ef100_vdpa_create(struct efx_nic *efx,
> vdpa_nic->vdpa_dev.dma_dev = &efx->pci_dev->dev;
> vdpa_nic->vdpa_dev.mdev = efx->mgmt_dev;
> vdpa_nic->efx = efx;
> + vdpa_nic->max_queue_pairs = allocated_vis - 1;
> vdpa_nic->pf_index = nic_data->pf_index;
> vdpa_nic->vf_index = nic_data->vf_index;
> vdpa_nic->vdpa_state = EF100_VDPA_STATE_INITIALIZED;
> @@ -136,6 +168,27 @@ static struct ef100_vdpa_nic *ef100_vdpa_create(struct efx_nic *efx,
> ether_addr_copy(vdpa_nic->mac_address, mac);
> vdpa_nic->mac_configured = true;
>
> + for (i = 0; i < (2 * vdpa_nic->max_queue_pairs); i++)
> + vdpa_nic->vring[i].irq = -EINVAL;
> +
> + rc = ef100_vdpa_irq_vectors_alloc(efx->pci_dev,
> + vdpa_nic->max_queue_pairs * 2);
> + if (rc < 0) {
> + pci_err(efx->pci_dev,
> + "vDPA IRQ alloc failed for vf: %u err:%d\n",
> + nic_data->vf_index, rc);
> + goto err_put_device;
> + }
Is it possible to move irq allocation/free to set_status()? This is
what other vDPA drivers did and it helped to save resources.
> +
> + rc = devm_add_action_or_reset(&efx->pci_dev->dev,
> + ef100_vdpa_irq_vectors_free,
> + efx->pci_dev);
> + if (rc) {
> + pci_err(efx->pci_dev,
> + "Failed adding devres for freeing irq vectors\n");
> + goto err_put_device;
> + }
> +
> rc = get_net_config(vdpa_nic);
> if (rc)
> goto err_put_device;
> @@ -147,6 +200,9 @@ static struct ef100_vdpa_nic *ef100_vdpa_create(struct efx_nic *efx,
> err_put_device:
> /* put_device invokes ef100_vdpa_free */
> put_device(&vdpa_nic->vdpa_dev.dev);
> +
> +err_alloc_vis_free:
> + efx_mcdi_free_vis(efx);
> return ERR_PTR(rc);
> }
>
> diff --git a/drivers/net/ethernet/sfc/ef100_vdpa.h b/drivers/net/ethernet/sfc/ef100_vdpa.h
> index be7650c3166a..3cc33daa0431 100644
> --- a/drivers/net/ethernet/sfc/ef100_vdpa.h
> +++ b/drivers/net/ethernet/sfc/ef100_vdpa.h
> @@ -33,6 +33,20 @@
> /* Alignment requirement of the Virtqueue */
> #define EF100_VDPA_VQ_ALIGN 4096
>
> +/* Vring configuration definitions */
> +#define EF100_VRING_ADDRESS_CONFIGURED 0x1
> +#define EF100_VRING_SIZE_CONFIGURED 0x10
> +#define EF100_VRING_READY_CONFIGURED 0x100
> +#define EF100_VRING_CONFIGURED (EF100_VRING_ADDRESS_CONFIGURED | \
> + EF100_VRING_SIZE_CONFIGURED | \
> + EF100_VRING_READY_CONFIGURED)
> +
> +/* Maximum size of msix name */
> +#define EF100_VDPA_MAX_MSIX_NAME_SIZE 256
> +
> +/* Default high IOVA for MCDI buffer */
> +#define EF100_VDPA_IOVA_BASE_ADDR 0x20000000000
> +
> /**
> * enum ef100_vdpa_nic_state - possible states for a vDPA NIC
> *
> @@ -58,6 +72,43 @@ enum ef100_vdpa_vq_type {
> EF100_VDPA_VQ_NTYPES
> };
>
> +/**
> + * struct ef100_vdpa_vring_info - vDPA vring data structure
> + *
> + * @desc: Descriptor area address of the vring
> + * @avail: Available area address of the vring
> + * @used: Device area address of the vring
> + * @size: Number of entries in the vring
> + * @vring_state: bit map to track vring configuration
> + * @vring_created: set to true when vring is created.
I wonder if we can merge vring_created into one bit of the vring_state.
> + * @last_avail_idx: last available index of the vring
> + * @last_used_idx: last used index of the vring
> + * @doorbell_offset: doorbell offset
> + * @doorbell_offset_valid: true if @doorbell_offset is updated
> + * @vring_type: type of vring created
> + * @vring_ctx: vring context information
> + * @msix_name: device name for vring irq handler
> + * @irq: irq number for vring irq handler
> + * @cb: callback for vring interrupts
> + */
> +struct ef100_vdpa_vring_info {
> + dma_addr_t desc;
> + dma_addr_t avail;
> + dma_addr_t used;
> + u32 size;
> + u16 vring_state;
> + bool vring_created;
> + u32 last_avail_idx;
> + u32 last_used_idx;
> + u32 doorbell_offset;
> + bool doorbell_offset_valid;
> + enum ef100_vdpa_vq_type vring_type;
> + struct efx_vring_ctx *vring_ctx;
> + char msix_name[EF100_VDPA_MAX_MSIX_NAME_SIZE];
> + u32 irq;
> + struct vdpa_callback cb;
> +};
> +
> /**
> * struct ef100_vdpa_nic - vDPA NIC data structure
> *
> @@ -71,6 +122,7 @@ enum ef100_vdpa_vq_type {
> * @features: negotiated feature bits
> * @max_queue_pairs: maximum number of queue pairs supported
> * @net_config: virtio_net_config data
> + * @vring: vring information of the vDPA device.
> * @mac_address: mac address of interface associated with this vdpa device
> * @mac_configured: true after MAC address is configured
> * @cfg_cb: callback for config change
> @@ -87,6 +139,7 @@ struct ef100_vdpa_nic {
> u64 features;
> u32 max_queue_pairs;
> struct virtio_net_config net_config;
> + struct ef100_vdpa_vring_info vring[EF100_VDPA_MAX_QUEUES_PAIRS * 2];
> u8 *mac_address;
> bool mac_configured;
> struct vdpa_callback cfg_cb;
> @@ -96,6 +149,8 @@ int ef100_vdpa_init(struct efx_probe_data *probe_data);
> void ef100_vdpa_fini(struct efx_probe_data *probe_data);
> int ef100_vdpa_register_mgmtdev(struct efx_nic *efx);
> void ef100_vdpa_unregister_mgmtdev(struct efx_nic *efx);
> +int ef100_vdpa_irq_vectors_alloc(struct pci_dev *pci_dev, u16 nvqs);
> +void ef100_vdpa_irq_vectors_free(void *data);
>
> static inline bool efx_vdpa_is_little_endian(struct ef100_vdpa_nic *vdpa_nic)
> {
> diff --git a/drivers/net/ethernet/sfc/ef100_vdpa_ops.c b/drivers/net/ethernet/sfc/ef100_vdpa_ops.c
> index 87899baa1c52..b7efd3e0c901 100644
> --- a/drivers/net/ethernet/sfc/ef100_vdpa_ops.c
> +++ b/drivers/net/ethernet/sfc/ef100_vdpa_ops.c
> @@ -10,13 +10,441 @@
>
> #include <linux/vdpa.h>
> #include "ef100_vdpa.h"
> +#include "io.h"
> #include "mcdi_vdpa.h"
>
> +/* Get the queue's function-local index of the associated VI
> + * virtqueue number queue 0 is reserved for MCDI
> + */
> +#define EFX_GET_VI_INDEX(vq_num) (((vq_num) / 2) + 1)
> +
> static struct ef100_vdpa_nic *get_vdpa_nic(struct vdpa_device *vdev)
> {
> return container_of(vdev, struct ef100_vdpa_nic, vdpa_dev);
> }
>
> +static irqreturn_t vring_intr_handler(int irq, void *arg)
> +{
> + struct ef100_vdpa_vring_info *vring = arg;
> +
> + if (vring->cb.callback)
> + return vring->cb.callback(vring->cb.private);
> +
> + return IRQ_NONE;
> +}
> +
> +int ef100_vdpa_irq_vectors_alloc(struct pci_dev *pci_dev, u16 nvqs)
> +{
> + int rc;
> +
> + rc = pci_alloc_irq_vectors(pci_dev, nvqs, nvqs, PCI_IRQ_MSIX);
> + if (rc < 0)
> + pci_err(pci_dev,
> + "Failed to alloc %d IRQ vectors, err:%d\n", nvqs, rc);
> + return rc;
> +}
> +
> +void ef100_vdpa_irq_vectors_free(void *data)
> +{
> + pci_free_irq_vectors(data);
> +}
> +
> +static int irq_vring_init(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
> +{
> + struct ef100_vdpa_vring_info *vring = &vdpa_nic->vring[idx];
> + struct pci_dev *pci_dev = vdpa_nic->efx->pci_dev;
> + int irq;
> + int rc;
> +
> + snprintf(vring->msix_name, 256, "x_vdpa[%s]-%d\n",
> + pci_name(pci_dev), idx);
> + irq = pci_irq_vector(pci_dev, idx);
> + rc = devm_request_irq(&pci_dev->dev, irq, vring_intr_handler, 0,
> + vring->msix_name, vring);
> + if (rc)
> + pci_err(pci_dev,
> + "devm_request_irq failed for vring %d, rc %d\n",
> + idx, rc);
> + else
> + vring->irq = irq;
> +
> + return rc;
> +}
> +
> +static void irq_vring_fini(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
> +{
> + struct ef100_vdpa_vring_info *vring = &vdpa_nic->vring[idx];
> + struct pci_dev *pci_dev = vdpa_nic->efx->pci_dev;
> +
> + devm_free_irq(&pci_dev->dev, vring->irq, vring);
> + vring->irq = -EINVAL;
> +}
> +
> +static bool can_create_vring(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
> +{
> + if (vdpa_nic->vring[idx].vring_state == EF100_VRING_CONFIGURED &&
> + vdpa_nic->status & VIRTIO_CONFIG_S_DRIVER_OK &&
> + !vdpa_nic->vring[idx].vring_created)
> + return true;
> +
> + return false;
> +}
> +
> +static int create_vring_ctx(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
> +{
> + struct efx_vring_ctx *vring_ctx;
> + u32 vi_index;
> +
> + if (idx % 2) /* Even VQ for RX and odd for TX */
> + vdpa_nic->vring[idx].vring_type = EF100_VDPA_VQ_TYPE_NET_TXQ;
> + else
> + vdpa_nic->vring[idx].vring_type = EF100_VDPA_VQ_TYPE_NET_RXQ;
> + vi_index = EFX_GET_VI_INDEX(idx);
> + vdpa_nic->vring[idx].vring_type);
> + if (IS_ERR(vring_ctx))
> + return PTR_ERR(vring_ctx);
> +
> + vdpa_nic->vring[idx].vring_ctx = vring_ctx;
> + return 0;
> +}
> +
> +static void delete_vring_ctx(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
> +{
> + efx_vdpa_vring_fini(vdpa_nic->vring[idx].vring_ctx);
> + vdpa_nic->vring[idx].vring_ctx = NULL;
> +}
> +
> +static int delete_vring(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
> +{
> + struct efx_vring_dyn_cfg vring_dyn_cfg;
> + int rc;
> +
> + rc = efx_vdpa_vring_destroy(vdpa_nic->vring[idx].vring_ctx,
> + &vring_dyn_cfg);
> + if (rc)
> + dev_err(&vdpa_nic->vdpa_dev.dev,
> + "%s: delete vring failed index:%u, err:%d\n",
> + __func__, idx, rc);
> + vdpa_nic->vring[idx].last_avail_idx = vring_dyn_cfg.avail_idx;
> + vdpa_nic->vring[idx].last_used_idx = vring_dyn_cfg.used_idx;
> + vdpa_nic->vring[idx].vring_created = false;
> +
> + irq_vring_fini(vdpa_nic, idx);
> +
> + if (vdpa_nic->vring[idx].vring_ctx)
> + delete_vring_ctx(vdpa_nic, idx);
> +
> + return rc;
> +}
> +
> +static int create_vring(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
> +{
> + struct efx_vring_dyn_cfg vring_dyn_cfg;
> + struct efx_vring_ctx *vring_ctx;
> + struct efx_vring_cfg vring_cfg;
> + u32 offset;
> + int rc;
> +
> + if (!vdpa_nic->vring[idx].vring_ctx) {
> + rc = create_vring_ctx(vdpa_nic, idx);
> + if (rc) {
> + dev_err(&vdpa_nic->vdpa_dev.dev,
> + "%s: create_vring_ctx failed idx:%u, err:%d\n",
> + __func__, idx, rc);
> + return rc;
> + }
> + }
> + vring_ctx = vdpa_nic->vring[idx].vring_ctx;
> +
> + rc = irq_vring_init(vdpa_nic, idx);
> + if (rc) {
> + dev_err(&vdpa_nic->vdpa_dev.dev,
> + "%s: irq_vring_init failed. index:%u, err:%d\n",
> + __func__, idx, rc);
> + goto err_irq_vring_init;
> + }
> + vring_cfg.desc = vdpa_nic->vring[idx].desc;
> + vring_cfg.avail = vdpa_nic->vring[idx].avail;
> + vring_cfg.used = vdpa_nic->vring[idx].used;
> + vring_cfg.size = vdpa_nic->vring[idx].size;
> + vring_cfg.features = vdpa_nic->features;
> + vring_cfg.msix_vector = idx;
> + vring_dyn_cfg.avail_idx = vdpa_nic->vring[idx].last_avail_idx;
> + vring_dyn_cfg.used_idx = vdpa_nic->vring[idx].last_used_idx;
> +
> + rc = efx_vdpa_vring_create(vring_ctx, &vring_cfg, &vring_dyn_cfg);
> + if (rc) {
> + dev_err(&vdpa_nic->vdpa_dev.dev,
> + "%s: vring_create failed index:%u, err:%d\n",
> + __func__, idx, rc);
> + goto err_vring_create;
> + }
> + vdpa_nic->vring[idx].vring_created = true;
> + if (!vdpa_nic->vring[idx].doorbell_offset_valid) {
> + rc = efx_vdpa_get_doorbell_offset(vring_ctx, &offset);
> + if (rc) {
> + dev_err(&vdpa_nic->vdpa_dev.dev,
> + "%s: get offset failed, index:%u err:%d\n",
> + __func__, idx, rc);
> + goto err_get_doorbell_offset;
> + }
> + vdpa_nic->vring[idx].doorbell_offset = offset;
> + vdpa_nic->vring[idx].doorbell_offset_valid = true;
> + }
> +
> + return 0;
> +
> +err_get_doorbell_offset:
> + efx_vdpa_vring_destroy(vdpa_nic->vring[idx].vring_ctx,
> + &vring_dyn_cfg);
> + vdpa_nic->vring[idx].vring_created = false;
> +err_vring_create:
> + irq_vring_fini(vdpa_nic, idx);
> +err_irq_vring_init:
> + delete_vring_ctx(vdpa_nic, idx);
> +
> + return rc;
> +}
> +
> +static void reset_vring(struct ef100_vdpa_nic *vdpa_nic, u16 idx)
> +{
> + if (vdpa_nic->vring[idx].vring_created)
> + delete_vring(vdpa_nic, idx);
> +
> + memset((void *)&vdpa_nic->vring[idx], 0,
> + sizeof(vdpa_nic->vring[idx]));
> + vdpa_nic->vring[idx].vring_type = EF100_VDPA_VQ_NTYPES;
> +}
> +
> +static bool is_qid_invalid(struct ef100_vdpa_nic *vdpa_nic, u16 idx,
> + const char *caller)
> +{
> + if (unlikely(idx >= (vdpa_nic->max_queue_pairs * 2))) {
> + dev_err(&vdpa_nic->vdpa_dev.dev,
> + "%s: Invalid qid %u\n", caller, idx);
> + return true;
> + }
> + return false;
> +}
> +
> +static int ef100_vdpa_set_vq_address(struct vdpa_device *vdev,
> + u16 idx, u64 desc_area, u64 driver_area,
> + u64 device_area)
> +{
> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
> +
> + if (is_qid_invalid(vdpa_nic, idx, __func__))
> + return -EINVAL;
> +
> + mutex_lock(&vdpa_nic->lock);
> + vdpa_nic->vring[idx].desc = desc_area;
> + vdpa_nic->vring[idx].avail = driver_area;
> + vdpa_nic->vring[idx].used = device_area;
> + vdpa_nic->vring[idx].vring_state |= EF100_VRING_ADDRESS_CONFIGURED;
Does this mean the NIC is unable to handle the case where the
virtqueue is mis-configured?
> + mutex_unlock(&vdpa_nic->lock);
> + return 0;
> +}
> +
> +static void ef100_vdpa_set_vq_num(struct vdpa_device *vdev, u16 idx, u32 num)
> +{
> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
> +
> + if (is_qid_invalid(vdpa_nic, idx, __func__))
> + return;
> +
> + if (!is_power_of_2(num)) {
> + dev_err(&vdev->dev, "%s: Index:%u size:%u not power of 2\n",
> + __func__, idx, num);
> + return;
> + }
> + if (num > EF100_VDPA_VQ_NUM_MAX_SIZE) {
> + dev_err(&vdev->dev, "%s: Index:%u size:%u more than max:%u\n",
> + __func__, idx, num, EF100_VDPA_VQ_NUM_MAX_SIZE);
> + return;
> + }
> + mutex_lock(&vdpa_nic->lock);
> + vdpa_nic->vring[idx].size = num;
> + vdpa_nic->vring[idx].vring_state |= EF100_VRING_SIZE_CONFIGURED;
> + mutex_unlock(&vdpa_nic->lock);
> +}
> +
> +static void ef100_vdpa_kick_vq(struct vdpa_device *vdev, u16 idx)
> +{
> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
> + u32 idx_val;
> +
> + if (is_qid_invalid(vdpa_nic, idx, __func__))
> + return;
> +
> + if (!vdpa_nic->vring[idx].vring_created) {
> + dev_err(&vdev->dev, "%s: Invalid vring%u\n", __func__, idx);
> + return;
> + }
This seems guest/user space trigger-able, if yes, let's avoid this warning.
> +
> + idx_val = idx;
> + _efx_writed(vdpa_nic->efx, cpu_to_le32(idx_val),
> + vdpa_nic->vring[idx].doorbell_offset);
> +}
> +
> +static void ef100_vdpa_set_vq_cb(struct vdpa_device *vdev, u16 idx,
> + struct vdpa_callback *cb)
> +{
> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
> +
> + if (is_qid_invalid(vdpa_nic, idx, __func__))
> + return;
> +
> + if (cb)
> + vdpa_nic->vring[idx].cb = *cb;
> +}
> +
> +static void ef100_vdpa_set_vq_ready(struct vdpa_device *vdev, u16 idx,
> + bool ready)
> +{
> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
> +
> + if (is_qid_invalid(vdpa_nic, idx, __func__))
> + return;
> +
> + mutex_lock(&vdpa_nic->lock);
> + if (ready) {
> + vdpa_nic->vring[idx].vring_state |=
> + EF100_VRING_READY_CONFIGURED;
> + if (vdpa_nic->vdpa_state == EF100_VDPA_STATE_STARTED &&
> + can_create_vring(vdpa_nic, idx)) {
If this is the only caller of can_create_vring(), let's move the check
of vdpa_state into the can_create_vring().
> + if (create_vring(vdpa_nic, idx))
> + /* Rollback ready configuration
> + * So that the above layer driver
> + * can make another attempt to set ready
> + */
> + vdpa_nic->vring[idx].vring_state &=
> + ~EF100_VRING_READY_CONFIGURED;
> + }
> + } else {
> + vdpa_nic->vring[idx].vring_state &=
> + ~EF100_VRING_READY_CONFIGURED;
> + if (vdpa_nic->vring[idx].vring_created)
> + delete_vring(vdpa_nic, idx);
> + }
> + mutex_unlock(&vdpa_nic->lock);
> +}
> +
> +static bool ef100_vdpa_get_vq_ready(struct vdpa_device *vdev, u16 idx)
> +{
> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
> + bool ready;
> +
> + if (is_qid_invalid(vdpa_nic, idx, __func__))
> + return false;
> +
> + mutex_lock(&vdpa_nic->lock);
> + ready = vdpa_nic->vring[idx].vring_state & EF100_VRING_READY_CONFIGURED;
> + mutex_unlock(&vdpa_nic->lock);
> + return ready;
> +}
> +
> +static int ef100_vdpa_set_vq_state(struct vdpa_device *vdev, u16 idx,
> + const struct vdpa_vq_state *state)
> +{
> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
> +
> + if (is_qid_invalid(vdpa_nic, idx, __func__))
> + return -EINVAL;
> +
> + mutex_lock(&vdpa_nic->lock);
> + vdpa_nic->vring[idx].last_avail_idx = state->split.avail_index;
Should we update last_used_idx here as well?
> + mutex_unlock(&vdpa_nic->lock);
> + return 0;
> +}
> +
> +static int ef100_vdpa_get_vq_state(struct vdpa_device *vdev,
> + u16 idx, struct vdpa_vq_state *state)
> +{
> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
> +
> + if (is_qid_invalid(vdpa_nic, idx, __func__))
> + return -EINVAL;
> +
> + mutex_lock(&vdpa_nic->lock);
> + state->split.avail_index = (u16)vdpa_nic->vring[idx].last_avail_idx;
> + mutex_unlock(&vdpa_nic->lock);
> +
> + return 0;
> +}
> +
> +static struct vdpa_notification_area
> + ef100_vdpa_get_vq_notification(struct vdpa_device *vdev,
> + u16 idx)
> +{
> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
> + struct vdpa_notification_area notify_area = {0, 0};
> + struct efx_vring_ctx *vring_ctx;
> + struct efx_nic *efx;
> + u32 offset;
> + int rc;
> +
> + if (is_qid_invalid(vdpa_nic, idx, __func__))
> + goto end;
> +
> + mutex_lock(&vdpa_nic->lock);
> + vring_ctx = vdpa_nic->vring[idx].vring_ctx;
> + if (!vring_ctx) {
> + rc = create_vring_ctx(vdpa_nic, idx);
Interesting, in set_vq_ready() we call can_create_vring() before
create_vring(). The code here implies usespace can bypass that check,
is this intended?
> + if (rc) {
> + dev_err(&vdpa_nic->vdpa_dev.dev,
> + "%s: vring ctx failed index:%u, err:%d\n",
> + __func__, idx, rc);
> + goto err_create_vring_ctx;
> + }
> + vring_ctx = vdpa_nic->vring[idx].vring_ctx;
> + }
> + if (!vdpa_nic->vring[idx].doorbell_offset_valid) {
I wonder if it's better to do this in the dev_add() since it is not
expected to be changed.
> + rc = efx_vdpa_get_doorbell_offset(vring_ctx, &offset);
> + if (rc) {
> + dev_err(&vdpa_nic->vdpa_dev.dev,
> + "%s: get_doorbell failed idx:%u, err:%d\n",
> + __func__, idx, rc);
> + goto err_get_doorbell_off;
> + }
> + vdpa_nic->vring[idx].doorbell_offset = offset;
> + vdpa_nic->vring[idx].doorbell_offset_valid = true;
> + }
> +
> + efx = vdpa_nic->efx;
> + notify_area.addr = (uintptr_t)(efx->membase_phys +
> + vdpa_nic->vring[idx].doorbell_offset);
> + /* VDPA doorbells are at a stride of VI/2
> + * One VI stride is shared by both rx & tx doorbells
> + */
> + notify_area.size = efx->vi_stride / 2;
Note that, if each area does not occupy a page, it means it can't be
mapped into userspace.
> +
> + mutex_unlock(&vdpa_nic->lock);
> + return notify_area;
> +
> +err_get_doorbell_off:
> + delete_vring_ctx(vdpa_nic, idx);
> +err_create_vring_ctx:
> + mutex_unlock(&vdpa_nic->lock);
> +end:
> + return notify_area;
> +}
> +
> +static int ef100_get_vq_irq(struct vdpa_device *vdev, u16 idx)
> +{
> + struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
> + u32 irq;
> +
> + if (is_qid_invalid(vdpa_nic, idx, __func__))
It might be easier to use a macro to implement is_qid_invalid() then
we don't need to __func__ trick.
Thanks
> + return -EINVAL;
> +
> + mutex_lock(&vdpa_nic->lock);
> + irq = vdpa_nic->vring[idx].irq;
> + mutex_unlock(&vdpa_nic->lock);
> +
> + return irq;
> +}
> +
> static u32 ef100_vdpa_get_vq_align(struct vdpa_device *vdev)
> {
> return EF100_VDPA_VQ_ALIGN;
> @@ -98,6 +526,8 @@ static void ef100_vdpa_set_config_cb(struct vdpa_device *vdev,
>
> if (cb)
> vdpa_nic->cfg_cb = *cb;
> + else
> + memset(&vdpa_nic->cfg_cb, 0, sizeof(vdpa_nic->cfg_cb));
> }
>
> static u16 ef100_vdpa_get_vq_num_max(struct vdpa_device *vdev)
> @@ -155,11 +585,28 @@ static void ef100_vdpa_set_config(struct vdpa_device *vdev, unsigned int offset,
> static void ef100_vdpa_free(struct vdpa_device *vdev)
> {
> struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
> + int i;
>
> - mutex_destroy(&vdpa_nic->lock);
> + if (vdpa_nic) {
> + for (i = 0; i < (vdpa_nic->max_queue_pairs * 2); i++)
> + reset_vring(vdpa_nic, i);
> + ef100_vdpa_irq_vectors_free(vdpa_nic->efx->pci_dev);
> + mutex_destroy(&vdpa_nic->lock);
> + vdpa_nic->efx->vdpa_nic = NULL;
> + }
> }
>
> const struct vdpa_config_ops ef100_vdpa_config_ops = {
> + .set_vq_address = ef100_vdpa_set_vq_address,
> + .set_vq_num = ef100_vdpa_set_vq_num,
> + .kick_vq = ef100_vdpa_kick_vq,
> + .set_vq_cb = ef100_vdpa_set_vq_cb,
> + .set_vq_ready = ef100_vdpa_set_vq_ready,
> + .get_vq_ready = ef100_vdpa_get_vq_ready,
> + .set_vq_state = ef100_vdpa_set_vq_state,
> + .get_vq_state = ef100_vdpa_get_vq_state,
> + .get_vq_notification = ef100_vdpa_get_vq_notification,
> + .get_vq_irq = ef100_get_vq_irq,
> .get_vq_align = ef100_vdpa_get_vq_align,
> .get_device_features = ef100_vdpa_get_device_features,
> .set_driver_features = ef100_vdpa_set_driver_features,
> --
> 2.30.1
>
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