Re: [PATCH for-next 0/2] Small optimization for ib_map_mr_sg() and ib_map_mr_sg_pi()

From: Leon Romanovsky
Date: Wed Nov 06 2024 - 07:08:30 EST


On Tue, Nov 05, 2024 at 08:08:39PM +0800, Junxian Huang wrote:
> ib_map_mr_sg() and ib_map_mr_sg_pi() allow ULPs to specify NULL as
> the sg_offset/data_sg_offset/meta_sg_offset arguments. Drivers who
> need to derefernce these arguments have to add NULL pointer checks
> to avoid crashing the kernel.
>
> This can be optimized by adding dummy sg_offset pointer to these
> two APIs. When the sg_offset arguments are NULL, pass the pointer
> of dummy to drivers. Drivers can always get a valid pointer, so no
> need to add NULL pointer checks.
>
> Junxian Huang (2):
> RDMA/core: Add dummy sg_offset pointer for ib_map_mr_sg() and
> ib_map_mr_sg_pi()
> RDMA: Delete NULL pointer checks for sg_offset in .map_mr_sg ops
>
> drivers/infiniband/core/verbs.c | 12 +++++++++---
> drivers/infiniband/hw/mlx5/mr.c | 18 ++++++------------
> drivers/infiniband/sw/rdmavt/trace_mr.h | 2 +-
> 3 files changed, 16 insertions(+), 16 deletions(-)

So what does this change give us?
We have same functionality, same number of lines, same everything ...

Thanks

>
> --
> 2.33.0
>
>