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Message-ID: <bad68533-dc5e-7728-2e42-287fa91426d8@amd.com>
Date: Fri, 16 Dec 2022 18:20:36 +0530
From: Gautam Dawar <gdawar@....com>
To: Jason Wang <jasowang@...hat.com>,
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 02/11] sfc: implement MCDI interface for vDPA
operations
On 12/14/22 12:13, Jason Wang wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
>
>
> On Wed, Dec 7, 2022 at 10:56 PM Gautam Dawar <gautam.dawar@....com> wrote:
>> Implement functions to perform vDPA operations like creating and
>> removing virtqueues, getting doorbell register offset etc. using
>> the MCDI interface with FW.
>>
>> Signed-off-by: Gautam Dawar <gautam.dawar@....com>
>> ---
>> drivers/net/ethernet/sfc/Kconfig | 8 +
>> drivers/net/ethernet/sfc/Makefile | 1 +
>> drivers/net/ethernet/sfc/ef100_vdpa.h | 32 +++
>> drivers/net/ethernet/sfc/mcdi.h | 4 +
>> drivers/net/ethernet/sfc/mcdi_vdpa.c | 268 ++++++++++++++++++++++++++
>> drivers/net/ethernet/sfc/mcdi_vdpa.h | 84 ++++++++
>> 6 files changed, 397 insertions(+)
>> create mode 100644 drivers/net/ethernet/sfc/ef100_vdpa.h
>> create mode 100644 drivers/net/ethernet/sfc/mcdi_vdpa.c
>> create mode 100644 drivers/net/ethernet/sfc/mcdi_vdpa.h
>>
>> diff --git a/drivers/net/ethernet/sfc/Kconfig b/drivers/net/ethernet/sfc/Kconfig
>> index 0950e6b0508f..1fa626c87d36 100644
>> --- a/drivers/net/ethernet/sfc/Kconfig
>> +++ b/drivers/net/ethernet/sfc/Kconfig
>> @@ -63,6 +63,14 @@ config SFC_MCDI_LOGGING
>> Driver-Interface) commands and responses, allowing debugging of
>> driver/firmware interaction. The tracing is actually enabled by
>> a sysfs file 'mcdi_logging' under the PCI device.
>> +config SFC_VDPA
>> + bool "Solarflare EF100-family VDPA support"
>> + depends on SFC && VDPA && SFC_SRIOV
>> + default y
>> + help
>> + This enables support for the virtio data path acceleration (vDPA).
>> + vDPA device's datapath complies with the virtio specification,
>> + but control path is vendor specific.
>>
>> source "drivers/net/ethernet/sfc/falcon/Kconfig"
>> source "drivers/net/ethernet/sfc/siena/Kconfig"
>> diff --git a/drivers/net/ethernet/sfc/Makefile b/drivers/net/ethernet/sfc/Makefile
>> index 712a48d00069..059a0944e89a 100644
>> --- a/drivers/net/ethernet/sfc/Makefile
>> +++ b/drivers/net/ethernet/sfc/Makefile
>> @@ -11,6 +11,7 @@ sfc-$(CONFIG_SFC_MTD) += mtd.o
>> sfc-$(CONFIG_SFC_SRIOV) += sriov.o ef10_sriov.o ef100_sriov.o ef100_rep.o \
>> mae.o tc.o tc_bindings.o tc_counters.o
>>
>> +sfc-$(CONFIG_SFC_VDPA) += mcdi_vdpa.o
>> obj-$(CONFIG_SFC) += sfc.o
>>
>> obj-$(CONFIG_SFC_FALCON) += falcon/
>> diff --git a/drivers/net/ethernet/sfc/ef100_vdpa.h b/drivers/net/ethernet/sfc/ef100_vdpa.h
>> new file mode 100644
>> index 000000000000..f6564448d0c7
>> --- /dev/null
>> +++ b/drivers/net/ethernet/sfc/ef100_vdpa.h
>> @@ -0,0 +1,32 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/* Driver for Xilinx network controllers and boards
>> + * Copyright (C) 2020-2022, Xilinx, Inc.
>> + * Copyright (C) 2022, Advanced Micro Devices, Inc.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License version 2 as published
>> + * by the Free Software Foundation, incorporated herein by reference.
>> + */
>> +
>> +#ifndef __EF100_VDPA_H__
>> +#define __EF100_VDPA_H__
>> +
>> +#include <linux/vdpa.h>
>> +#include <uapi/linux/virtio_net.h>
>> +#include "net_driver.h"
>> +#include "ef100_nic.h"
>> +
>> +#if defined(CONFIG_SFC_VDPA)
>> +
>> +enum ef100_vdpa_device_type {
>> + EF100_VDPA_DEVICE_TYPE_NET,
>> +};
>> +
>> +enum ef100_vdpa_vq_type {
>> + EF100_VDPA_VQ_TYPE_NET_RXQ,
>> + EF100_VDPA_VQ_TYPE_NET_TXQ,
>> + EF100_VDPA_VQ_NTYPES
>> +};
>> +
>> +#endif /* CONFIG_SFC_VDPA */
>> +#endif /* __EF100_VDPA_H__ */
>> diff --git a/drivers/net/ethernet/sfc/mcdi.h b/drivers/net/ethernet/sfc/mcdi.h
>> index 7e35fec9da35..db4ca4975ada 100644
>> --- a/drivers/net/ethernet/sfc/mcdi.h
>> +++ b/drivers/net/ethernet/sfc/mcdi.h
>> @@ -214,6 +214,10 @@ void efx_mcdi_sensor_event(struct efx_nic *efx, efx_qword_t *ev);
>> #define _MCDI_STRUCT_DWORD(_buf, _field) \
>> ((_buf) + (_MCDI_CHECK_ALIGN(_field ## _OFST, 4) >> 2))
>>
>> +#define MCDI_SET_BYTE(_buf, _field, _value) do { \
>> + BUILD_BUG_ON(MC_CMD_ ## _field ## _LEN != 1); \
>> + *(u8 *)MCDI_PTR(_buf, _field) = _value; \
>> + } while (0)
>> #define MCDI_STRUCT_SET_BYTE(_buf, _field, _value) do { \
>> BUILD_BUG_ON(_field ## _LEN != 1); \
>> *(u8 *)MCDI_STRUCT_PTR(_buf, _field) = _value; \
>> diff --git a/drivers/net/ethernet/sfc/mcdi_vdpa.c b/drivers/net/ethernet/sfc/mcdi_vdpa.c
>> new file mode 100644
>> index 000000000000..35f822170049
>> --- /dev/null
>> +++ b/drivers/net/ethernet/sfc/mcdi_vdpa.c
>> @@ -0,0 +1,268 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/* Driver for Xilinx network controllers and boards
>> + * Copyright (C) 2020-2022, Xilinx, Inc.
>> + * Copyright (C) 2022, Advanced Micro Devices, Inc.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License version 2 as published
>> + * by the Free Software Foundation, incorporated herein by reference.
>> + */
>> +
>> +#include <linux/vdpa.h>
>> +#include "ef100_vdpa.h"
>> +#include "efx.h"
>> +#include "nic.h"
>> +#include "mcdi_vdpa.h"
>> +#include "mcdi_pcol.h"
>> +
>> +/* The value of target_vf in virtio MC commands like
>> + * virtqueue create, delete and get doorbell offset should
>> + * contain the VF index when the calling function is a PF
>> + * and VF_NULL (0xFFFF) otherwise. As the vDPA driver invokes
>> + * MC commands in context of the VF, it uses VF_NULL.
>> + */
>> +#define MC_CMD_VIRTIO_TARGET_VF_NULL 0xFFFF
>> +
>> +struct efx_vring_ctx *efx_vdpa_vring_init(struct efx_nic *efx, u32 vi,
>> + enum ef100_vdpa_vq_type vring_type)
>> +{
>> + struct efx_vring_ctx *vring_ctx;
>> + u32 queue_cmd;
>> +
>> + vring_ctx = kzalloc(sizeof(*vring_ctx), GFP_KERNEL);
>> + if (!vring_ctx)
>> + return ERR_PTR(-ENOMEM);
>> +
>> + switch (vring_type) {
>> + case EF100_VDPA_VQ_TYPE_NET_RXQ:
>> + queue_cmd = MC_CMD_VIRTIO_INIT_QUEUE_REQ_NET_RXQ;
>> + break;
>> + case EF100_VDPA_VQ_TYPE_NET_TXQ:
>> + queue_cmd = MC_CMD_VIRTIO_INIT_QUEUE_REQ_NET_TXQ;
>> + break;
>> + default:
>> + pci_err(efx->pci_dev,
>> + "%s: Invalid Queue type %u\n", __func__, vring_type);
>> + kfree(vring_ctx);
>> + return ERR_PTR(-ENOMEM);
>> + }
>> +
>> + vring_ctx->efx = efx;
>> + vring_ctx->vf_index = MC_CMD_VIRTIO_TARGET_VF_NULL;
>> + vring_ctx->vi_index = vi;
>> + vring_ctx->mcdi_vring_type = queue_cmd;
>> + return vring_ctx;
>> +}
>> +
>> +void efx_vdpa_vring_fini(struct efx_vring_ctx *vring_ctx)
>> +{
>> + kfree(vring_ctx);
>> +}
>> +
>> +int efx_vdpa_get_features(struct efx_nic *efx,
>> + enum ef100_vdpa_device_type type,
>> + u64 *features)
>> +{
>> + MCDI_DECLARE_BUF(outbuf, MC_CMD_VIRTIO_GET_FEATURES_OUT_LEN);
>> + MCDI_DECLARE_BUF(inbuf, MC_CMD_VIRTIO_GET_FEATURES_IN_LEN);
>> + u32 high_val, low_val;
>> + ssize_t outlen;
>> + u32 dev_type;
>> + int rc;
>> +
>> + if (!efx) {
>> + pci_err(efx->pci_dev, "%s: Invalid NIC pointer\n", __func__);
>> + return -EINVAL;
>> + }
>> + switch (type) {
>> + case EF100_VDPA_DEVICE_TYPE_NET:
>> + dev_type = MC_CMD_VIRTIO_GET_FEATURES_IN_NET;
>> + break;
>> + default:
>> + pci_err(efx->pci_dev,
>> + "%s: Device type %d not supported\n", __func__, type);
>> + return -EINVAL;
>> + }
>> + MCDI_SET_DWORD(inbuf, VIRTIO_GET_FEATURES_IN_DEVICE_ID, dev_type);
>> + rc = efx_mcdi_rpc(efx, MC_CMD_VIRTIO_GET_FEATURES, inbuf, sizeof(inbuf),
>> + outbuf, sizeof(outbuf), &outlen);
>> + if (rc)
>> + return rc;
>> + if (outlen < MC_CMD_VIRTIO_GET_FEATURES_OUT_LEN)
>> + return -EIO;
>> + low_val = MCDI_DWORD(outbuf, VIRTIO_GET_FEATURES_OUT_FEATURES_LO);
>> + high_val = MCDI_DWORD(outbuf, VIRTIO_GET_FEATURES_OUT_FEATURES_HI);
>> + *features = ((u64)high_val << 32) | low_val;
>> + return 0;
>> +}
>> +
>> +int efx_vdpa_verify_features(struct efx_nic *efx,
>> + enum ef100_vdpa_device_type type, u64 features)
>> +{
>> + MCDI_DECLARE_BUF(inbuf, MC_CMD_VIRTIO_TEST_FEATURES_IN_LEN);
>> + u32 dev_type;
>> + int rc;
>> +
>> + BUILD_BUG_ON(MC_CMD_VIRTIO_TEST_FEATURES_OUT_LEN != 0);
>> + switch (type) {
>> + case EF100_VDPA_DEVICE_TYPE_NET:
>> + dev_type = MC_CMD_VIRTIO_GET_FEATURES_IN_NET;
>> + break;
>> + default:
>> + pci_err(efx->pci_dev,
>> + "%s: Device type %d not supported\n", __func__, type);
>> + return -EINVAL;
>> + }
>> + MCDI_SET_DWORD(inbuf, VIRTIO_TEST_FEATURES_IN_DEVICE_ID, dev_type);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_TEST_FEATURES_IN_FEATURES_LO, features);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_TEST_FEATURES_IN_FEATURES_HI,
>> + features >> 32);
>> + rc = efx_mcdi_rpc(efx, MC_CMD_VIRTIO_TEST_FEATURES, inbuf,
>> + sizeof(inbuf), NULL, 0, NULL);
>> + return rc;
>> +}
>> +
>> +int efx_vdpa_vring_create(struct efx_vring_ctx *vring_ctx,
>> + struct efx_vring_cfg *vring_cfg,
>> + struct efx_vring_dyn_cfg *vring_dyn_cfg)
>> +{
>> + MCDI_DECLARE_BUF(inbuf, MC_CMD_VIRTIO_INIT_QUEUE_REQ_LEN);
>> + struct efx_nic *efx = vring_ctx->efx;
>> + int rc;
>> +
>> + BUILD_BUG_ON(MC_CMD_VIRTIO_INIT_QUEUE_RESP_LEN != 0);
>> +
>> + MCDI_SET_BYTE(inbuf, VIRTIO_INIT_QUEUE_REQ_QUEUE_TYPE,
>> + vring_ctx->mcdi_vring_type);
>> + MCDI_SET_WORD(inbuf, VIRTIO_INIT_QUEUE_REQ_TARGET_VF,
>> + vring_ctx->vf_index);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_INSTANCE,
>> + vring_ctx->vi_index);
>> +
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_SIZE, vring_cfg->size);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_DESC_TBL_ADDR_LO,
>> + vring_cfg->desc);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_DESC_TBL_ADDR_HI,
>> + vring_cfg->desc >> 32);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_AVAIL_RING_ADDR_LO,
>> + vring_cfg->avail);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_AVAIL_RING_ADDR_HI,
>> + vring_cfg->avail >> 32);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_USED_RING_ADDR_LO,
>> + vring_cfg->used);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_USED_RING_ADDR_HI,
>> + vring_cfg->used >> 32);
>> + MCDI_SET_WORD(inbuf, VIRTIO_INIT_QUEUE_REQ_MSIX_VECTOR,
>> + vring_cfg->msix_vector);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_FEATURES_LO,
>> + vring_cfg->features);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_FEATURES_HI,
>> + vring_cfg->features >> 32);
>> +
>> + if (vring_dyn_cfg) {
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_INITIAL_PIDX,
>> + vring_dyn_cfg->avail_idx);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_INITIAL_CIDX,
>> + vring_dyn_cfg->used_idx);
>> + }
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_MPORT_SELECTOR,
>> + MAE_MPORT_SELECTOR_ASSIGNED);
>> +
>> + rc = efx_mcdi_rpc(efx, MC_CMD_VIRTIO_INIT_QUEUE, inbuf, sizeof(inbuf),
>> + NULL, 0, NULL);
> It looks to me the mcdi_buffer belongs to the VF (allocated by the
> calling of ef100_probe_vf()), I wonder how it is isolated from the DMA
> that is initiated by userspace(guest)?
>
> Thanks
Yes, I just responded to this concern on a similar comment in patch 9/11.
>
>
>> + return rc;
>> +}
>> +
>> +int efx_vdpa_vring_destroy(struct efx_vring_ctx *vring_ctx,
>> + struct efx_vring_dyn_cfg *vring_dyn_cfg)
>> +{
>> + MCDI_DECLARE_BUF(outbuf, MC_CMD_VIRTIO_FINI_QUEUE_RESP_LEN);
>> + MCDI_DECLARE_BUF(inbuf, MC_CMD_VIRTIO_FINI_QUEUE_REQ_LEN);
>> + struct efx_nic *efx = vring_ctx->efx;
>> + ssize_t outlen;
>> + int rc;
>> +
>> + MCDI_SET_BYTE(inbuf, VIRTIO_FINI_QUEUE_REQ_QUEUE_TYPE,
>> + vring_ctx->mcdi_vring_type);
>> + MCDI_SET_WORD(inbuf, VIRTIO_INIT_QUEUE_REQ_TARGET_VF,
>> + vring_ctx->vf_index);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_INIT_QUEUE_REQ_INSTANCE,
>> + vring_ctx->vi_index);
>> + rc = efx_mcdi_rpc(efx, MC_CMD_VIRTIO_FINI_QUEUE, inbuf, sizeof(inbuf),
>> + outbuf, sizeof(outbuf), &outlen);
>> +
>> + if (rc)
>> + return rc;
>> +
>> + if (outlen < MC_CMD_VIRTIO_FINI_QUEUE_RESP_LEN)
>> + return -EIO;
>> +
>> + if (vring_dyn_cfg) {
>> + vring_dyn_cfg->avail_idx = MCDI_DWORD(outbuf,
>> + VIRTIO_FINI_QUEUE_RESP_FINAL_PIDX);
>> + vring_dyn_cfg->used_idx = MCDI_DWORD(outbuf,
>> + VIRTIO_FINI_QUEUE_RESP_FINAL_CIDX);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +int efx_vdpa_get_doorbell_offset(struct efx_vring_ctx *vring_ctx,
>> + u32 *offset)
>> +{
>> + MCDI_DECLARE_BUF(outbuf, MC_CMD_VIRTIO_GET_NET_DOORBELL_OFFSET_RESP_LEN);
>> + MCDI_DECLARE_BUF(inbuf, MC_CMD_VIRTIO_GET_DOORBELL_OFFSET_REQ_LEN);
>> + struct efx_nic *efx = vring_ctx->efx;
>> + ssize_t outlen;
>> + int rc;
>> +
>> + if (vring_ctx->mcdi_vring_type != MC_CMD_VIRTIO_INIT_QUEUE_REQ_NET_RXQ &&
>> + vring_ctx->mcdi_vring_type != MC_CMD_VIRTIO_INIT_QUEUE_REQ_NET_TXQ) {
>> + pci_err(efx->pci_dev,
>> + "%s: Invalid Queue type %u\n",
>> + __func__, vring_ctx->mcdi_vring_type);
>> + return -EINVAL;
>> + }
>> +
>> + MCDI_SET_BYTE(inbuf, VIRTIO_GET_DOORBELL_OFFSET_REQ_DEVICE_ID,
>> + MC_CMD_VIRTIO_GET_FEATURES_IN_NET);
>> + MCDI_SET_WORD(inbuf, VIRTIO_GET_DOORBELL_OFFSET_REQ_TARGET_VF,
>> + vring_ctx->vf_index);
>> + MCDI_SET_DWORD(inbuf, VIRTIO_GET_DOORBELL_OFFSET_REQ_INSTANCE,
>> + vring_ctx->vi_index);
>> +
>> + rc = efx_mcdi_rpc(efx, MC_CMD_VIRTIO_GET_DOORBELL_OFFSET, inbuf,
>> + sizeof(inbuf), outbuf, sizeof(outbuf), &outlen);
>> + if (rc)
>> + return rc;
>> +
>> + if (outlen < MC_CMD_VIRTIO_GET_NET_DOORBELL_OFFSET_RESP_LEN)
>> + return -EIO;
>> + if (vring_ctx->mcdi_vring_type == MC_CMD_VIRTIO_INIT_QUEUE_REQ_NET_RXQ)
>> + *offset = MCDI_DWORD(outbuf,
>> + VIRTIO_GET_NET_DOORBELL_OFFSET_RESP_RX_DBL_OFFSET);
>> + else
>> + *offset = MCDI_DWORD(outbuf,
>> + VIRTIO_GET_NET_DOORBELL_OFFSET_RESP_TX_DBL_OFFSET);
>> +
>> + return 0;
>> +}
>> +
>> +int efx_vdpa_get_mtu(struct efx_nic *efx, u16 *mtu)
>> +{
>> + MCDI_DECLARE_BUF(outbuf, MC_CMD_SET_MAC_V2_OUT_LEN);
>> + MCDI_DECLARE_BUF(inbuf, MC_CMD_SET_MAC_EXT_IN_LEN);
>> + ssize_t outlen;
>> + int rc;
>> +
>> + MCDI_SET_DWORD(inbuf, SET_MAC_EXT_IN_CONTROL, 0);
>> + rc = efx_mcdi_rpc(efx, MC_CMD_SET_MAC, inbuf, sizeof(inbuf),
>> + outbuf, sizeof(outbuf), &outlen);
>> + if (rc)
>> + return rc;
>> + if (outlen < MC_CMD_SET_MAC_V2_OUT_LEN)
>> + return -EIO;
>> +
>> + *mtu = MCDI_DWORD(outbuf, SET_MAC_V2_OUT_MTU);
>> + return 0;
>> +}
>> diff --git a/drivers/net/ethernet/sfc/mcdi_vdpa.h b/drivers/net/ethernet/sfc/mcdi_vdpa.h
>> new file mode 100644
>> index 000000000000..2a0f7c647c44
>> --- /dev/null
>> +++ b/drivers/net/ethernet/sfc/mcdi_vdpa.h
>> @@ -0,0 +1,84 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/* Driver for Xilinx network controllers and boards
>> + * Copyright (C) 2020-2022, Xilinx, Inc.
>> + * Copyright (C) 2022, Advanced Micro Devices, Inc.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License version 2 as published
>> + * by the Free Software Foundation, incorporated herein by reference.
>> + */
>> +
>> +#ifndef EFX_MCDI_VDPA_H
>> +#define EFX_MCDI_VDPA_H
>> +
>> +#if defined(CONFIG_SFC_VDPA)
>> +#include "mcdi.h"
>> +
>> +/**
>> + * struct efx_vring_ctx: The vring context
>> + *
>> + * @efx: pointer of the VF's efx_nic object
>> + * @vf_index: VF index of the vDPA VF
>> + * @vi_index: vi index to be used for queue creation
>> + * @mcdi_vring_type: corresponding MCDI vring type
>> + */
>> +struct efx_vring_ctx {
>> + struct efx_nic *efx;
>> + u32 vf_index;
>> + u32 vi_index;
>> + u32 mcdi_vring_type;
>> +};
>> +
>> +/**
>> + * struct efx_vring_cfg: Configuration for vring creation
>> + *
>> + * @desc: Descriptor area address of the vring
>> + * @avail: Available area address of the vring
>> + * @used: Device area address of the vring
>> + * @size: Queue size, in entries. Must be a power of two
>> + * @msix_vector: msix vector address for the queue
>> + * @features: negotiated feature bits
>> + */
>> +struct efx_vring_cfg {
>> + u64 desc;
>> + u64 avail;
>> + u64 used;
>> + u32 size;
>> + u16 msix_vector;
>> + u64 features;
>> +};
>> +
>> +/**
>> + * struct efx_vring_dyn_cfg - dynamic vring configuration
>> + *
>> + * @avail_idx: last available index of the vring
>> + * @used_idx: last used index of the vring
>> + */
>> +struct efx_vring_dyn_cfg {
>> + u32 avail_idx;
>> + u32 used_idx;
>> +};
>> +
>> +int efx_vdpa_get_features(struct efx_nic *efx, enum ef100_vdpa_device_type type,
>> + u64 *featuresp);
>> +
>> +int efx_vdpa_verify_features(struct efx_nic *efx,
>> + enum ef100_vdpa_device_type type, u64 features);
>> +
>> +struct efx_vring_ctx *efx_vdpa_vring_init(struct efx_nic *efx, u32 vi,
>> + enum ef100_vdpa_vq_type vring_type);
>> +
>> +void efx_vdpa_vring_fini(struct efx_vring_ctx *vring_ctx);
>> +
>> +int efx_vdpa_vring_create(struct efx_vring_ctx *vring_ctx,
>> + struct efx_vring_cfg *vring_cfg,
>> + struct efx_vring_dyn_cfg *vring_dyn_cfg);
>> +
>> +int efx_vdpa_vring_destroy(struct efx_vring_ctx *vring_ctx,
>> + struct efx_vring_dyn_cfg *vring_dyn_cfg);
>> +
>> +int efx_vdpa_get_doorbell_offset(struct efx_vring_ctx *vring_ctx,
>> + u32 *offsetp);
>> +int efx_vdpa_get_mtu(struct efx_nic *efx, u16 *mtu);
>> +#endif
>> +#endif
>> --
>> 2.30.1
>>
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