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Date: Tue, 15 Aug 2023 16:11:36 -0700
From: Si-Wei Liu <si-wei.liu@...cle.com>
To: Dragos Tatulea <dtatulea@...dia.com>,
"jasowang@...hat.com" <jasowang@...hat.com>
Cc: "virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
"mst@...hat.com" <mst@...hat.com>, Gal Pressman <gal@...dia.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"eperezma@...hat.com" <eperezma@...hat.com>,
"xuanzhuo@...ux.alibaba.com" <xuanzhuo@...ux.alibaba.com>
Subject: Re: [PATCH RFC 2/4] vdpa/mlx5: implement .reset_map driver op
On 8/15/2023 1:26 AM, Dragos Tatulea wrote:
> On Mon, 2023-08-14 at 18:43 -0700, Si-Wei Liu wrote:
>> This patch is based on top of the "vdpa/mlx5: Fixes
>> for ASID handling" series [1].
>>
>> [1] vdpa/mlx5: Fixes for ASID handling
>> https://lore.kernel.org/virtualization/20230802171231.11001-1-dtatulea@nvidia.com/
>>
>> Signed-off-by: Si-Wei Liu <si-wei.liu@...cle.com>
>> ---
>> drivers/vdpa/mlx5/core/mlx5_vdpa.h | 1 +
>> drivers/vdpa/mlx5/core/mr.c | 72 +++++++++++++++++++++----------------
>> -
>> drivers/vdpa/mlx5/net/mlx5_vnet.c | 18 +++++++---
>> 3 files changed, 54 insertions(+), 37 deletions(-)
>>
>> diff --git a/drivers/vdpa/mlx5/core/mlx5_vdpa.h
>> b/drivers/vdpa/mlx5/core/mlx5_vdpa.h
>> index b53420e..5c9a25a 100644
>> --- a/drivers/vdpa/mlx5/core/mlx5_vdpa.h
>> +++ b/drivers/vdpa/mlx5/core/mlx5_vdpa.h
>> @@ -123,6 +123,7 @@ int mlx5_vdpa_create_mr(struct mlx5_vdpa_dev *mvdev,
>> struct vhost_iotlb *iotlb,
>> unsigned int asid);
>> void mlx5_vdpa_destroy_mr(struct mlx5_vdpa_dev *mvdev);
>> void mlx5_vdpa_destroy_mr_asid(struct mlx5_vdpa_dev *mvdev, unsigned int
>> asid);
>> +int mlx5_vdpa_reset_mr(struct mlx5_vdpa_dev *mvdev, unsigned int asid);
>>
>> #define mlx5_vdpa_warn(__dev, format,
>> ...) \
>> dev_warn((__dev)->mdev->device, "%s:%d:(pid %d) warning: " format,
>> __func__, __LINE__, \
>> diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
>> index 5a1971fc..c8d64fc 100644
>> --- a/drivers/vdpa/mlx5/core/mr.c
>> +++ b/drivers/vdpa/mlx5/core/mr.c
>> @@ -489,21 +489,15 @@ static void destroy_user_mr(struct mlx5_vdpa_dev *mvdev,
>> struct mlx5_vdpa_mr *mr
>> }
>> }
>>
>> -static void _mlx5_vdpa_destroy_cvq_mr(struct mlx5_vdpa_dev *mvdev, unsigned
>> int asid)
>> +static void _mlx5_vdpa_destroy_cvq_mr(struct mlx5_vdpa_dev *mvdev)
>> {
>> - if (mvdev->group2asid[MLX5_VDPA_CVQ_GROUP] != asid)
>> - return;
>> -
>> prune_iotlb(mvdev);
>> }
>>
>> -static void _mlx5_vdpa_destroy_dvq_mr(struct mlx5_vdpa_dev *mvdev, unsigned
>> int asid)
>> +static void _mlx5_vdpa_destroy_dvq_mr(struct mlx5_vdpa_dev *mvdev)
>> {
>> struct mlx5_vdpa_mr *mr = &mvdev->mr;
>>
>> - if (mvdev->group2asid[MLX5_VDPA_DATAVQ_GROUP] != asid)
>> - return;
>> -
>> if (!mr->initialized)
>> return;
>>
>> @@ -521,8 +515,10 @@ void mlx5_vdpa_destroy_mr_asid(struct mlx5_vdpa_dev
>> *mvdev, unsigned int asid)
>>
>> mutex_lock(&mr->mkey_mtx);
>>
>> - _mlx5_vdpa_destroy_dvq_mr(mvdev, asid);
>> - _mlx5_vdpa_destroy_cvq_mr(mvdev, asid);
>> + if (mvdev->group2asid[MLX5_VDPA_DATAVQ_GROUP] == asid)
>> + _mlx5_vdpa_destroy_dvq_mr(mvdev);
>> + if (mvdev->group2asid[MLX5_VDPA_CVQ_GROUP] == asid)
>> + _mlx5_vdpa_destroy_cvq_mr(mvdev);
>>
>> mutex_unlock(&mr->mkey_mtx);
>> }
>> @@ -534,25 +530,17 @@ void mlx5_vdpa_destroy_mr(struct mlx5_vdpa_dev *mvdev)
>> }
>>
>> static int _mlx5_vdpa_create_cvq_mr(struct mlx5_vdpa_dev *mvdev,
>> - struct vhost_iotlb *iotlb,
>> - unsigned int asid)
>> + struct vhost_iotlb *iotlb)
>> {
>> - if (mvdev->group2asid[MLX5_VDPA_CVQ_GROUP] != asid)
>> - return 0;
>> -
>> return dup_iotlb(mvdev, iotlb);
>> }
>>
>> static int _mlx5_vdpa_create_dvq_mr(struct mlx5_vdpa_dev *mvdev,
>> - struct vhost_iotlb *iotlb,
>> - unsigned int asid)
>> + struct vhost_iotlb *iotlb)
>> {
>> struct mlx5_vdpa_mr *mr = &mvdev->mr;
>> int err;
>>
>> - if (mvdev->group2asid[MLX5_VDPA_DATAVQ_GROUP] != asid)
>> - return 0;
>> -
>> if (mr->initialized)
>> return 0;
>>
>> @@ -574,20 +562,18 @@ static int _mlx5_vdpa_create_mr(struct mlx5_vdpa_dev
>> *mvdev,
>> {
>> int err;
>>
>> - err = _mlx5_vdpa_create_dvq_mr(mvdev, iotlb, asid);
>> - if (err)
>> - return err;
>> -
>> - err = _mlx5_vdpa_create_cvq_mr(mvdev, iotlb, asid);
>> - if (err)
>> - goto out_err;
>> + if (mvdev->group2asid[MLX5_VDPA_DATAVQ_GROUP] == asid) {
>> + err = _mlx5_vdpa_create_dvq_mr(mvdev, iotlb, asid);
>> + if (err)
>> + return err;
>> + }
>> + if (mvdev->group2asid[MLX5_VDPA_CVQ_GROUP] == asid) {
>> + err = _mlx5_vdpa_create_cvq_mr(mvdev, iotlb);
>> + if (err)
>> + return err;
> I think you still need the goto here, when CVQ and DVQ fall in same asid and
> there's a CVQ mr creation error, you are left stuck with the DVQ mr.
Yes, you are right, I will fix this in v2. Thank you for spotting this!
-Siwei
>
>> + }
>>
>> return 0;
>> -
>> -out_err:
>> - _mlx5_vdpa_destroy_dvq_mr(mvdev, asid);
>> -
>> - return err;
>> }
>>
>> int mlx5_vdpa_create_mr(struct mlx5_vdpa_dev *mvdev, struct vhost_iotlb
>> *iotlb,
>> @@ -601,6 +587,28 @@ int mlx5_vdpa_create_mr(struct mlx5_vdpa_dev *mvdev,
>> struct vhost_iotlb *iotlb,
>> return err;
>> }
>>
>> +int mlx5_vdpa_reset_mr(struct mlx5_vdpa_dev *mvdev, unsigned int asid)
>> +{
>> + struct mlx5_vdpa_mr *mr = &mvdev->mr;
>> + int err = 0;
>> +
>> + if (asid != 0)
>> + return 0;
>> +
>> + mutex_lock(&mr->mkey_mtx);
>> + if (!mr->user_mr)
>> + goto out;
>> + _mlx5_vdpa_destroy_dvq_mr(mvdev);
>> + if (MLX5_CAP_GEN(mvdev->mdev, umem_uid_0)) {
>> + err = _mlx5_vdpa_create_dvq_mr(mvdev, NULL, 0);
>> + if (err)
>> + mlx5_vdpa_warn(mvdev, "create DMA MR failed\n");
>> + }
>> +out:
>> + mutex_unlock(&mr->mkey_mtx);
>> + return err;
>> +}
>> +
>> int mlx5_vdpa_handle_set_map(struct mlx5_vdpa_dev *mvdev, struct vhost_iotlb
>> *iotlb,
>> bool *change_map, unsigned int asid)
>> {
>> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c
>> b/drivers/vdpa/mlx5/net/mlx5_vnet.c
>> index 61c10ba..399a690 100644
>> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
>> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
>> @@ -2816,7 +2816,6 @@ static int mlx5_vdpa_reset(struct vdpa_device *vdev)
>> unregister_link_notifier(ndev);
>> teardown_driver(ndev);
>> clear_vqs_ready(ndev);
>> - mlx5_vdpa_destroy_mr(&ndev->mvdev);
>> ndev->mvdev.status = 0;
>> ndev->mvdev.suspended = false;
>> ndev->cur_num_vqs = 0;
>> @@ -2827,10 +2826,6 @@ static int mlx5_vdpa_reset(struct vdpa_device *vdev)
>> init_group_to_asid_map(mvdev);
>> ++mvdev->generation;
>>
>> - if (MLX5_CAP_GEN(mvdev->mdev, umem_uid_0)) {
>> - if (mlx5_vdpa_create_mr(mvdev, NULL, 0))
>> - mlx5_vdpa_warn(mvdev, "create MR failed\n");
>> - }
>> up_write(&ndev->reslock);
>>
>> return 0;
>> @@ -2895,6 +2890,18 @@ static int mlx5_vdpa_set_map(struct vdpa_device *vdev,
>> unsigned int asid,
>> return err;
>> }
>>
>> +static int mlx5_vdpa_reset_map(struct vdpa_device *vdev, unsigned int asid)
>> +{
>> + struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
>> + struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
>> + int err;
>> +
>> + down_write(&ndev->reslock);
>> + err = mlx5_vdpa_reset_mr(mvdev, asid);
>> + up_write(&ndev->reslock);
>> + return err;
>> +}
>> +
>> static struct device *mlx5_get_vq_dma_dev(struct vdpa_device *vdev, u16 idx)
>> {
>> struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
>> @@ -3154,6 +3161,7 @@ static int mlx5_set_group_asid(struct vdpa_device *vdev,
>> u32 group,
>> .set_config = mlx5_vdpa_set_config,
>> .get_generation = mlx5_vdpa_get_generation,
>> .set_map = mlx5_vdpa_set_map,
>> + .reset_map = mlx5_vdpa_reset_map,
>> .set_group_asid = mlx5_set_group_asid,
>> .get_vq_dma_dev = mlx5_get_vq_dma_dev,
>> .free = mlx5_vdpa_free,
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