linux/drivers/infiniband
Sergey Gorenko 2d8f9e4e1d IB/iser: Prevent invalidating wrong MR
[ Upstream commit 2f1888281e ]

The iser_reg_resources structure has two pointers to MR but only one
mr_valid field. The implementation assumes that we use only *sig_mr when
pi_enable is true. Otherwise, we use only *mr. However, it is only
sometimes correct. Read commands without protection information occur even
when pi_enble is true. For example, the following SCSI commands have a
Data-In buffer but never have protection information: READ CAPACITY (16),
INQUIRY, MODE SENSE(6), MAINTENANCE IN. So, we use
*sig_mr for some SCSI commands and *mr for the other SCSI commands.

In most cases, it works fine because the remote invalidation is applied.
However, there are two cases when the remote invalidation is not
applicable.
 1. Small write commands when all data is sent as an immediate.
 2. The target does not support the remote invalidation feature.

The lazy invalidation is used if the remote invalidation is impossible.
Since, at the lazy invalidation, we always invalidate the MR we want to
use, the wrong MR may be invalidated.

To fix the issue, we need a field per MR that indicates the MR needs
invalidation. Since the ib_mr structure already has such a field, let's
use ib_mr.need_inval instead of iser_reg_resources.mr_valid.

Fixes: b76a439982 ("IB/iser: Use IB_WR_REG_MR_INTEGRITY for PI handover")
Link: https://lore.kernel.org/r/20231219072311.40989-1-sergeygo@nvidia.com
Acked-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Sergey Gorenko <sergeygo@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-01-25 15:35:40 -08:00
..
core RDMA/core: Fix umem iterator when PAGE_SIZE is greater then HCA pgsz 2023-12-13 18:45:16 +01:00
hw RDMA/hns: Fix memory leak in free_mr_init() 2024-01-25 15:35:34 -08:00
sw RDMA/siw: Fix connection failure handling 2023-09-11 14:53:23 +03:00
ulp IB/iser: Prevent invalidating wrong MR 2024-01-25 15:35:40 -08:00
Kconfig RDMA: Disable IB HW for UML 2022-12-04 15:22:03 +02:00
Makefile