netdev - Re: [PATCH rdma-next v1 12/12] IB/mlx5: Add DEVX support for CQ events

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Date:   Mon, 24 Jun 2019 20:03:07 +0300
From:   Yishai Hadas <yishaih@....mellanox.co.il>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     Leon Romanovsky <leon@...nel.org>,
        Doug Ledford <dledford@...hat.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Yishai Hadas <yishaih@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH rdma-next v1 12/12] IB/mlx5: Add DEVX support for CQ
 events

On 6/24/2019 3:04 PM, Jason Gunthorpe wrote:
> On Tue, Jun 18, 2019 at 08:15:40PM +0300, Leon Romanovsky wrote:
>> From: Yishai Hadas <yishaih@...lanox.com>
>>
>> Add DEVX support for CQ events by creating and destroying the CQ via
>> mlx5_core and set an handler to manage its completions.
>>
>> Signed-off-by: Yishai Hadas <yishaih@...lanox.com>
>> Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
>>   drivers/infiniband/hw/mlx5/devx.c | 40 +++++++++++++++++++++++++++++++
>>   1 file changed, 40 insertions(+)
>>
>> diff --git a/drivers/infiniband/hw/mlx5/devx.c b/drivers/infiniband/hw/mlx5/devx.c
>> index 49fdce95d6d9..91ccd58ebc05 100644
>> +++ b/drivers/infiniband/hw/mlx5/devx.c
>> @@ -19,9 +19,12 @@
>>   #define UVERBS_MODULE_NAME mlx5_ib
>>   #include <rdma/uverbs_named_ioctl.h>
>>   
>> +static void dispatch_event_fd(struct list_head *fd_list, const void *data);
>> +
>>   enum devx_obj_flags {
>>   	DEVX_OBJ_FLAGS_INDIRECT_MKEY = 1 << 0,
>>   	DEVX_OBJ_FLAGS_DCT = 1 << 1,
>> +	DEVX_OBJ_FLAGS_CQ = 1 << 2,
>>   };
>>   
>>   struct devx_async_data {
>> @@ -94,6 +97,7 @@ struct devx_async_event_file {
>>   #define MLX5_MAX_DESTROY_INBOX_SIZE_DW MLX5_ST_SZ_DW(delete_fte_in)
>>   struct devx_obj {
>>   	struct mlx5_core_dev	*mdev;
>> +	struct mlx5_ib_dev	*ib_dev;
> 
> This seems strange, why would we need to store the core_dev and the ib_dev
> in a struct when ibdev->mdev == core_dev?
> 

We need to add the ib_dev as we can't access it from the core_dev.
Most of this patch we can probably go and drop the mdev and access it 
from ib_dev, I preferred to not handle that in this patch.