This is a note to let you know that I've just added the patch titled
IB/iser: Prevent invalidating wrong MR
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ib-iser-prevent-invalidating-wrong-mr.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7e9a61eb72b12f18a30802641ddc6a01e03f4f7f
Author: Sergey Gorenko <sergeygo@xxxxxxxxxx>
Date: Tue Dec 19 09:23:11 2023 +0200
IB/iser: Prevent invalidating wrong MR
[ Upstream commit 2f1888281e67205bd80d3e8f54dbd519a9653f26 ]
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: b76a439982f8 ("IB/iser: Use IB_WR_REG_MR_INTEGRITY for PI handover")
Link: https://lore.kernel.org/r/20231219072311.40989-1-sergeygo@xxxxxxxxxx
Acked-by: Max Gurtovoy <mgurtovoy@xxxxxxxxxx>
Signed-off-by: Sergey Gorenko <sergeygo@xxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h
index dee8c97ff056..d967d5532459 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.h
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.h
@@ -317,12 +317,10 @@ struct iser_device {
*
* @mr: memory region
* @sig_mr: signature memory region
- * @mr_valid: is mr valid indicator
*/
struct iser_reg_resources {
struct ib_mr *mr;
struct ib_mr *sig_mr;
- u8 mr_valid:1;
};
/**
diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c
index 7b83f48f60c5..8ec470c519e8 100644
--- a/drivers/infiniband/ulp/iser/iser_initiator.c
+++ b/drivers/infiniband/ulp/iser/iser_initiator.c
@@ -580,7 +580,10 @@ static inline int iser_inv_desc(struct iser_fr_desc *desc, u32 rkey)
return -EINVAL;
}
- desc->rsc.mr_valid = 0;
+ if (desc->sig_protected)
+ desc->rsc.sig_mr->need_inval = false;
+ else
+ desc->rsc.mr->need_inval = false;
return 0;
}
diff --git a/drivers/infiniband/ulp/iser/iser_memory.c b/drivers/infiniband/ulp/iser/iser_memory.c
index 29ae2c6a250a..6efcb79c8efe 100644
--- a/drivers/infiniband/ulp/iser/iser_memory.c
+++ b/drivers/infiniband/ulp/iser/iser_memory.c
@@ -264,7 +264,7 @@ static int iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask);
- if (rsc->mr_valid)
+ if (rsc->sig_mr->need_inval)
iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
@@ -288,7 +288,7 @@ static int iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
wr->access = IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_WRITE;
- rsc->mr_valid = 1;
+ rsc->sig_mr->need_inval = true;
sig_reg->sge.lkey = mr->lkey;
sig_reg->rkey = mr->rkey;
@@ -313,7 +313,7 @@ static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
struct ib_reg_wr *wr = &tx_desc->reg_wr;
int n;
- if (rsc->mr_valid)
+ if (rsc->mr->need_inval)
iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
@@ -336,7 +336,7 @@ static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
IB_ACCESS_REMOTE_WRITE |
IB_ACCESS_REMOTE_READ;
- rsc->mr_valid = 1;
+ rsc->mr->need_inval = true;
reg->sge.lkey = mr->lkey;
reg->rkey = mr->rkey;
diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c
index a00ca117303a..057e69164e6d 100644
--- a/drivers/infiniband/ulp/iser/iser_verbs.c
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -135,7 +135,6 @@ iser_create_fastreg_desc(struct iser_device *device,
goto err_alloc_mr_integrity;
}
}
- desc->rsc.mr_valid = 0;
return desc;
