| Message ID | 20231219072311.40989-1-sergeygo@nvidia.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Jason Gunthorpe |
| Headers | show |
| Series | IB/iser: Prevent invalidating wrong MR | expand |
On Tue, Dec 19, 2023 at 09:23:11AM +0200, Sergey Gorenko wrote: > 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") > Acked-by: Max Gurtovoy <mgurtovoy@nvidia.com> > Signed-off-by: Sergey Gorenko <sergeygo@nvidia.com> > --- > drivers/infiniband/ulp/iser/iscsi_iser.h | 2 -- > drivers/infiniband/ulp/iser/iser_initiator.c | 5 ++++- > drivers/infiniband/ulp/iser/iser_memory.c | 8 ++++---- > drivers/infiniband/ulp/iser/iser_verbs.c | 1 - > 4 files changed, 8 insertions(+), 8 deletions(-) Applied to for-next, thanks Jason
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 39ea73f69016..f5f090dc4f1e 100644 --- a/drivers/infiniband/ulp/iser/iser_initiator.c +++ b/drivers/infiniband/ulp/iser/iser_initiator.c @@ -581,7 +581,10 @@ 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 95b8eebf7e04..6801b70dc9e0 100644 --- a/drivers/infiniband/ulp/iser/iser_verbs.c +++ b/drivers/infiniband/ulp/iser/iser_verbs.c @@ -129,7 +129,6 @@ iser_create_fastreg_desc(struct iser_device *device, goto err_alloc_mr_integrity; } } - desc->rsc.mr_valid = 0; return desc;
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") Acked-by: Max Gurtovoy <mgurtovoy@nvidia.com> Signed-off-by: Sergey Gorenko <sergeygo@nvidia.com> --- drivers/infiniband/ulp/iser/iscsi_iser.h | 2 -- drivers/infiniband/ulp/iser/iser_initiator.c | 5 ++++- drivers/infiniband/ulp/iser/iser_memory.c | 8 ++++---- drivers/infiniband/ulp/iser/iser_verbs.c | 1 - 4 files changed, 8 insertions(+), 8 deletions(-)