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Date: Thu, 23 Mar 2023 13:09:26 +0800
From: Jason Wang <jasowang@...hat.com>
To: Shannon Nelson <shannon.nelson@....com>
Cc: mst@...hat.com, virtualization@...ts.linux-foundation.org,
brett.creeley@....com, davem@...emloft.net, netdev@...r.kernel.org,
kuba@...nel.org, drivers@...sando.io
Subject: Re: [PATCH v3 virtio 3/8] pds_vdpa: get vdpa management info
On Thu, Mar 23, 2023 at 3:11 AM Shannon Nelson <shannon.nelson@....com> wrote:
>
> Find the vDPA management information from the DSC in order to
> advertise it to the vdpa subsystem.
>
> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
Acked-by: Jason Wang <jasowang@...hat.com>
Thanks
> ---
> drivers/vdpa/pds/Makefile | 3 +-
> drivers/vdpa/pds/aux_drv.c | 17 ++++++
> drivers/vdpa/pds/aux_drv.h | 7 +++
> drivers/vdpa/pds/debugfs.c | 2 +
> drivers/vdpa/pds/vdpa_dev.c | 114 +++++++++++++++++++++++++++++++++++
> drivers/vdpa/pds/vdpa_dev.h | 15 +++++
> include/linux/pds/pds_vdpa.h | 90 +++++++++++++++++++++++++++
> 7 files changed, 247 insertions(+), 1 deletion(-)
> create mode 100644 drivers/vdpa/pds/vdpa_dev.c
> create mode 100644 drivers/vdpa/pds/vdpa_dev.h
>
> diff --git a/drivers/vdpa/pds/Makefile b/drivers/vdpa/pds/Makefile
> index a9cd2f450ae1..13b50394ec64 100644
> --- a/drivers/vdpa/pds/Makefile
> +++ b/drivers/vdpa/pds/Makefile
> @@ -3,6 +3,7 @@
>
> obj-$(CONFIG_PDS_VDPA) := pds_vdpa.o
>
> -pds_vdpa-y := aux_drv.o
> +pds_vdpa-y := aux_drv.o \
> + vdpa_dev.o
>
> pds_vdpa-$(CONFIG_DEBUG_FS) += debugfs.o
> diff --git a/drivers/vdpa/pds/aux_drv.c b/drivers/vdpa/pds/aux_drv.c
> index 39c03f067b77..881acd869a9d 100644
> --- a/drivers/vdpa/pds/aux_drv.c
> +++ b/drivers/vdpa/pds/aux_drv.c
> @@ -3,6 +3,7 @@
>
> #include <linux/auxiliary_bus.h>
> #include <linux/pci.h>
> +#include <linux/vdpa.h>
>
> #include <linux/pds/pds_common.h>
> #include <linux/pds/pds_core_if.h>
> @@ -12,6 +13,7 @@
>
> #include "aux_drv.h"
> #include "debugfs.h"
> +#include "vdpa_dev.h"
>
> static const struct auxiliary_device_id pds_vdpa_id_table[] = {
> { .name = PDS_VDPA_DEV_NAME, },
> @@ -25,15 +27,28 @@ static int pds_vdpa_probe(struct auxiliary_device *aux_dev,
> struct pds_auxiliary_dev *padev =
> container_of(aux_dev, struct pds_auxiliary_dev, aux_dev);
> struct pds_vdpa_aux *vdpa_aux;
> + int err;
>
> vdpa_aux = kzalloc(sizeof(*vdpa_aux), GFP_KERNEL);
> if (!vdpa_aux)
> return -ENOMEM;
>
> vdpa_aux->padev = padev;
> + vdpa_aux->vf_id = pci_iov_vf_id(padev->vf_pdev);
> auxiliary_set_drvdata(aux_dev, vdpa_aux);
>
> + /* Get device ident info and set up the vdpa_mgmt_dev */
> + err = pds_vdpa_get_mgmt_info(vdpa_aux);
> + if (err)
> + goto err_free_mem;
> +
> return 0;
> +
> +err_free_mem:
> + kfree(vdpa_aux);
> + auxiliary_set_drvdata(aux_dev, NULL);
> +
> + return err;
> }
>
> static void pds_vdpa_remove(struct auxiliary_device *aux_dev)
> @@ -41,6 +56,8 @@ static void pds_vdpa_remove(struct auxiliary_device *aux_dev)
> struct pds_vdpa_aux *vdpa_aux = auxiliary_get_drvdata(aux_dev);
> struct device *dev = &aux_dev->dev;
>
> + pci_free_irq_vectors(vdpa_aux->padev->vf_pdev);
> +
> kfree(vdpa_aux);
> auxiliary_set_drvdata(aux_dev, NULL);
>
> diff --git a/drivers/vdpa/pds/aux_drv.h b/drivers/vdpa/pds/aux_drv.h
> index 14e465944dfd..94ba7abcaa43 100644
> --- a/drivers/vdpa/pds/aux_drv.h
> +++ b/drivers/vdpa/pds/aux_drv.h
> @@ -10,6 +10,13 @@
> struct pds_vdpa_aux {
> struct pds_auxiliary_dev *padev;
>
> + struct vdpa_mgmt_dev vdpa_mdev;
> +
> + struct pds_vdpa_ident ident;
> +
> + int vf_id;
> struct dentry *dentry;
> +
> + int nintrs;
> };
> #endif /* _AUX_DRV_H_ */
> diff --git a/drivers/vdpa/pds/debugfs.c b/drivers/vdpa/pds/debugfs.c
> index 12e844f96ccc..f4275fe667c3 100644
> --- a/drivers/vdpa/pds/debugfs.c
> +++ b/drivers/vdpa/pds/debugfs.c
> @@ -2,10 +2,12 @@
> /* Copyright(c) 2023 Advanced Micro Devices, Inc */
>
> #include <linux/pci.h>
> +#include <linux/vdpa.h>
>
> #include <linux/pds/pds_common.h>
> #include <linux/pds/pds_core_if.h>
> #include <linux/pds/pds_adminq.h>
> +#include <linux/pds/pds_vdpa.h>
> #include <linux/pds/pds_auxbus.h>
>
> #include "aux_drv.h"
> diff --git a/drivers/vdpa/pds/vdpa_dev.c b/drivers/vdpa/pds/vdpa_dev.c
> new file mode 100644
> index 000000000000..6345b3fa2440
> --- /dev/null
> +++ b/drivers/vdpa/pds/vdpa_dev.c
> @@ -0,0 +1,114 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc */
> +
> +#include <linux/pci.h>
> +#include <linux/vdpa.h>
> +#include <uapi/linux/vdpa.h>
> +
> +#include <linux/pds/pds_common.h>
> +#include <linux/pds/pds_core_if.h>
> +#include <linux/pds/pds_adminq.h>
> +#include <linux/pds/pds_auxbus.h>
> +#include <linux/pds/pds_vdpa.h>
> +
> +#include "vdpa_dev.h"
> +#include "aux_drv.h"
> +
> +static struct virtio_device_id pds_vdpa_id_table[] = {
> + {VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID},
> + {0},
> +};
> +
> +static int pds_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
> + const struct vdpa_dev_set_config *add_config)
> +{
> + return -EOPNOTSUPP;
> +}
> +
> +static void pds_vdpa_dev_del(struct vdpa_mgmt_dev *mdev,
> + struct vdpa_device *vdpa_dev)
> +{
> +}
> +
> +static const struct vdpa_mgmtdev_ops pds_vdpa_mgmt_dev_ops = {
> + .dev_add = pds_vdpa_dev_add,
> + .dev_del = pds_vdpa_dev_del
> +};
> +
> +int pds_vdpa_get_mgmt_info(struct pds_vdpa_aux *vdpa_aux)
> +{
> + struct pds_vdpa_ident_cmd ident_cmd = {
> + .opcode = PDS_VDPA_CMD_IDENT,
> + .vf_id = cpu_to_le16(vdpa_aux->vf_id),
> + };
> + struct pds_vdpa_comp ident_comp = {0};
> + struct vdpa_mgmt_dev *mgmt;
> + struct device *pf_dev;
> + struct pci_dev *pdev;
> + dma_addr_t ident_pa;
> + struct device *dev;
> + u16 max_vqs;
> + int err;
> +
> + dev = &vdpa_aux->padev->aux_dev.dev;
> + pdev = vdpa_aux->padev->vf_pdev;
> + mgmt = &vdpa_aux->vdpa_mdev;
> +
> + /* Get resource info through the PF's adminq. It is a block of info,
> + * so we need to map some memory for PF to make available to the
> + * firmware for writing the data.
> + */
> + pf_dev = &vdpa_aux->padev->pf_pdev->dev;
> + ident_pa = dma_map_single(pf_dev, &vdpa_aux->ident,
> + sizeof(vdpa_aux->ident), DMA_FROM_DEVICE);
> + if (dma_mapping_error(pf_dev, ident_pa)) {
> + dev_err(dev, "Failed to map ident space\n");
> + return -ENOMEM;
> + }
> +
> + ident_cmd.ident_pa = cpu_to_le64(ident_pa);
> + ident_cmd.len = cpu_to_le32(sizeof(vdpa_aux->ident));
> + err = vdpa_aux->padev->ops->adminq_cmd(vdpa_aux->padev,
> + (union pds_core_adminq_cmd *)&ident_cmd,
> + sizeof(ident_cmd),
> + (union pds_core_adminq_comp *)&ident_comp,
> + 0);
> + dma_unmap_single(pf_dev, ident_pa,
> + sizeof(vdpa_aux->ident), DMA_FROM_DEVICE);
> + if (err) {
> + dev_err(dev, "Failed to ident hw, status %d: %pe\n",
> + ident_comp.status, ERR_PTR(err));
> + return err;
> + }
> +
> + max_vqs = le16_to_cpu(vdpa_aux->ident.max_vqs);
> + mgmt->max_supported_vqs = min_t(u16, PDS_VDPA_MAX_QUEUES, max_vqs);
> + if (max_vqs > PDS_VDPA_MAX_QUEUES)
> + dev_info(dev, "FYI - Device supports more vqs (%d) than driver (%d)\n",
> + max_vqs, PDS_VDPA_MAX_QUEUES);
> +
> + mgmt->ops = &pds_vdpa_mgmt_dev_ops;
> + mgmt->id_table = pds_vdpa_id_table;
> + mgmt->device = dev;
> + mgmt->supported_features = le64_to_cpu(vdpa_aux->ident.hw_features);
> + mgmt->config_attr_mask = BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR);
> + mgmt->config_attr_mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP);
> +
> + /* Set up interrupts now that we know how many we might want
> + * each gets one, than add another for a control queue if supported
> + */
> + vdpa_aux->nintrs = mgmt->max_supported_vqs;
> + if (mgmt->supported_features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ))
> + vdpa_aux->nintrs++;
> +
> + err = pci_alloc_irq_vectors(pdev, vdpa_aux->nintrs, vdpa_aux->nintrs,
> + PCI_IRQ_MSIX);
> + if (err < 0) {
> + dev_err(dev, "Couldn't get %d msix vectors: %pe\n",
> + vdpa_aux->nintrs, ERR_PTR(err));
> + return err;
> + }
> + vdpa_aux->nintrs = err;
> +
> + return 0;
> +}
> diff --git a/drivers/vdpa/pds/vdpa_dev.h b/drivers/vdpa/pds/vdpa_dev.h
> new file mode 100644
> index 000000000000..97fab833a0aa
> --- /dev/null
> +++ b/drivers/vdpa/pds/vdpa_dev.h
> @@ -0,0 +1,15 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/* Copyright(c) 2023 Advanced Micro Devices, Inc */
> +
> +#ifndef _VDPA_DEV_H_
> +#define _VDPA_DEV_H_
> +
> +#define PDS_VDPA_MAX_QUEUES 65
> +
> +struct pds_vdpa_device {
> + struct vdpa_device vdpa_dev;
> + struct pds_vdpa_aux *vdpa_aux;
> +};
> +
> +int pds_vdpa_get_mgmt_info(struct pds_vdpa_aux *vdpa_aux);
> +#endif /* _VDPA_DEV_H_ */
> diff --git a/include/linux/pds/pds_vdpa.h b/include/linux/pds/pds_vdpa.h
> index d3414536985d..c1d6a3fe2d61 100644
> --- a/include/linux/pds/pds_vdpa.h
> +++ b/include/linux/pds/pds_vdpa.h
> @@ -7,4 +7,94 @@
> #define PDS_DEV_TYPE_VDPA_STR "vDPA"
> #define PDS_VDPA_DEV_NAME PDS_CORE_DRV_NAME "." PDS_DEV_TYPE_VDPA_STR
>
> +/*
> + * enum pds_vdpa_cmd_opcode - vDPA Device commands
> + */
> +enum pds_vdpa_cmd_opcode {
> + PDS_VDPA_CMD_INIT = 48,
> + PDS_VDPA_CMD_IDENT = 49,
> + PDS_VDPA_CMD_RESET = 51,
> + PDS_VDPA_CMD_VQ_RESET = 52,
> + PDS_VDPA_CMD_VQ_INIT = 53,
> + PDS_VDPA_CMD_STATUS_UPDATE = 54,
> + PDS_VDPA_CMD_SET_FEATURES = 55,
> + PDS_VDPA_CMD_SET_ATTR = 56,
> + PDS_VDPA_CMD_VQ_SET_STATE = 57,
> + PDS_VDPA_CMD_VQ_GET_STATE = 58,
> +};
> +
> +/**
> + * struct pds_vdpa_cmd - generic command
> + * @opcode: Opcode
> + * @vdpa_index: Index for vdpa subdevice
> + * @vf_id: VF id
> + */
> +struct pds_vdpa_cmd {
> + u8 opcode;
> + u8 vdpa_index;
> + __le16 vf_id;
> +};
> +
> +/**
> + * struct pds_vdpa_comp - generic command completion
> + * @status: Status of the command (enum pds_core_status_code)
> + * @rsvd: Word boundary padding
> + * @color: Color bit
> + */
> +struct pds_vdpa_comp {
> + u8 status;
> + u8 rsvd[14];
> + u8 color;
> +};
> +
> +/**
> + * struct pds_vdpa_init_cmd - INIT command
> + * @opcode: Opcode PDS_VDPA_CMD_INIT
> + * @vdpa_index: Index for vdpa subdevice
> + * @vf_id: VF id
> + * @len: length of config info DMA space
> + * @config_pa: address for DMA of virtio config struct
> + */
> +struct pds_vdpa_init_cmd {
> + u8 opcode;
> + u8 vdpa_index;
> + __le16 vf_id;
> +};
> +
> +/**
> + * struct pds_vdpa_ident - vDPA identification data
> + * @hw_features: vDPA features supported by device
> + * @max_vqs: max queues available (2 queues for a single queuepair)
> + * @max_qlen: log(2) of maximum number of descriptors
> + * @min_qlen: log(2) of minimum number of descriptors
> + *
> + * This struct is used in a DMA block that is set up for the PDS_VDPA_CMD_IDENT
> + * transaction. Set up the DMA block and send the address in the IDENT cmd
> + * data, the DSC will write the ident information, then we can remove the DMA
> + * block after reading the answer. If the completion status is 0, then there
> + * is valid information, else there was an error and the data should be invalid.
> + */
> +struct pds_vdpa_ident {
> + __le64 hw_features;
> + __le16 max_vqs;
> + __le16 max_qlen;
> + __le16 min_qlen;
> +};
> +
> +/**
> + * struct pds_vdpa_ident_cmd - IDENT command
> + * @opcode: Opcode PDS_VDPA_CMD_IDENT
> + * @rsvd: Word boundary padding
> + * @vf_id: VF id
> + * @len: length of ident info DMA space
> + * @ident_pa: address for DMA of ident info (struct pds_vdpa_ident)
> + * only used for this transaction, then forgotten by DSC
> + */
> +struct pds_vdpa_ident_cmd {
> + u8 opcode;
> + u8 rsvd;
> + __le16 vf_id;
> + __le32 len;
> + __le64 ident_pa;
> +};
> #endif /* _PDS_VDPA_H_ */
> --
> 2.17.1
>
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