[PATCH v9 16/24] vfio/mlx5: Rewrite create mkey flow to allow better code reuse

[Jason Gunthorpe]

On Wed, Apr 23, 2025 at 11:13:07AM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro at nvidia.com>
> 
> Change the creation of mkey to be performed in multiple steps:
> data allocation, DMA setup and actual call to HW to create that mkey.
> 
> In this new flow, the whole input to MKEY command is saved to eliminate
> the need to keep array of pointers for DMA addresses for receive list
> and in the future patches for send list too.
> 
> In addition to memory size reduce and elimination of unnecessary data
> movements to set MKEY input, the code is prepared for future reuse.
> 
> Tested-by: Jens Axboe <axboe at kernel.dk>
> Signed-off-by: Leon Romanovsky <leonro at nvidia.com>
> ---
>  drivers/vfio/pci/mlx5/cmd.c | 157 ++++++++++++++++++++----------------
>  drivers/vfio/pci/mlx5/cmd.h |   4 +-
>  2 files changed, 91 insertions(+), 70 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>

Jason