netdev - Re: [PATCH mlx5-next 1/5] RDMA/mlx5: Replace struct mlx5_core

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Date:   Thu, 29 Jul 2021 12:28:03 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Aharon Landau <aharonl@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jason Wang <jasowang@...hat.com>, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>,
        netdev@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>,
        Shay Drory <shayd@...dia.com>,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH mlx5-next 1/5] RDMA/mlx5: Replace struct mlx5_core_mkey
 by u32 key

On Tue, Jun 22, 2021 at 03:08:19PM +0300, Leon Romanovsky wrote:

> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mr.c b/drivers/net/ethernet/mellanox/mlx5/core/mr.c
> index 50af84e76fb6..7a76b5eb1c1a 100644
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/mr.c
> @@ -35,13 +35,11 @@
>  #include <linux/mlx5/driver.h>
>  #include "mlx5_core.h"
>  
> -int mlx5_core_create_mkey(struct mlx5_core_dev *dev,
> -			  struct mlx5_core_mkey *mkey,
> -			  u32 *in, int inlen)
> +int mlx5_core_create_mkey(struct mlx5_core_dev *dev, u32 *mkey, u32 *in,
> +			  int inlen)
>  {
>  	u32 lout[MLX5_ST_SZ_DW(create_mkey_out)] = {};
>  	u32 mkey_index;
> -	void *mkc;
>  	int err;
>  
>  	MLX5_SET(create_mkey_in, in, opcode, MLX5_CMD_OP_CREATE_MKEY);
> @@ -50,38 +48,32 @@ int mlx5_core_create_mkey(struct mlx5_core_dev *dev,
>  	if (err)
>  		return err;
>  
> -	mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
>  	mkey_index = MLX5_GET(create_mkey_out, lout, mkey_index);
> -	mkey->iova = MLX5_GET64(mkc, mkc, start_addr);
> -	mkey->size = MLX5_GET64(mkc, mkc, len);
> -	mkey->key |= mlx5_idx_to_mkey(mkey_index);
> -	mkey->pd = MLX5_GET(mkc, mkc, pd);
> -	init_waitqueue_head(&mkey->wait);
> +	*mkey |= mlx5_idx_to_mkey(mkey_index);


This conflicts with 0232fc2ddcf4 ("net/mlx5: Reset mkey index on creation")

Please resend/rebase. I think it should be fixed like

	mkey_index = MLX5_GET(create_mkey_out, lout, mkey_index);
	*mkey = (u32)mlx5_mkey_variant(mkey->key) | mlx5_idx_to_mkey(mkey_index);

	mlx5_core_dbg(dev, "out 0x%x, mkey 0x%x\n", mkey_index,	*mkey);
?

(though I will look at the rest of the series today, so don't rush on
this)

Jason