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RDMA/core: Add protection for shared CQs used by ULPs

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A pre-step for adding shared CQs. Add the infrastructure to prevent shared
CQ users from altering the CQ configurations. For now all cqs are marked
as private (non-shared). The core driver should use the new force
functions to perform resize/destroy/moderation changes that are not
allowed for users of shared CQs.

Link: https://lore.kernel.org/r/1590568495-101621-2-git-send-email-yaminf@mellanox.com
Signed-off-by: Yamin Friedman <yaminf@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Yamin Friedman 2020-05-27 11:34:52 +03:00 committed by Jason Gunthorpe
parent 0b8e125e21
commit 3446cbd2d5
2 changed files with 13 additions and 1 deletions
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9
drivers/infiniband/core/verbs.c
View File

@ -2005,6 +2005,9 @@ EXPORT_SYMBOL(__ib_create_cq);
int rdma_set_cq_moderation(struct ib_cq *cq, u16 cq_count, u16 cq_period)
{
if (cq->shared)
return -EOPNOTSUPP;
return cq->device->ops.modify_cq ?
cq->device->ops.modify_cq(cq, cq_count,
cq_period) : -EOPNOTSUPP;
@ -2013,6 +2016,9 @@ EXPORT_SYMBOL(rdma_set_cq_moderation);
int ib_destroy_cq_user(struct ib_cq *cq, struct ib_udata *udata)
{
if (WARN_ON_ONCE(cq->shared))
return -EOPNOTSUPP;
if (atomic_read(&cq->usecnt))
return -EBUSY;
@ -2025,6 +2031,9 @@ EXPORT_SYMBOL(ib_destroy_cq_user);
int ib_resize_cq(struct ib_cq *cq, int cqe)
{
if (cq->shared)
return -EOPNOTSUPP;
return cq->device->ops.resize_cq ?
cq->device->ops.resize_cq(cq, cqe, NULL) : -EOPNOTSUPP;
}

5
include/rdma/ib_verbs.h
View File

@ -1613,7 +1613,8 @@ struct ib_cq {
/* updated only by trace points */
ktime_t timestamp;
bool interrupt;
u8 interrupt:1;
u8 shared:1;
/*
* Implementation details of the RDMA core, don't use in drivers:
@ -3909,6 +3910,8 @@ static inline struct ib_cq *ib_alloc_cq_any(struct ib_device *dev,
* ib_free_cq_user - Free kernel/user CQ
* @cq: The CQ to free
* @udata: Valid user data or NULL for kernel objects
*
* NOTE: This function shouldn't be called on shared CQs.
*/
void ib_free_cq_user(struct ib_cq *cq, struct ib_udata *udata);