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Message-ID: <5f9d33ec-145c-7c41-989a-1d80af3ea19d@oracle.com>
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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