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RDMA/rxe: Remove tasklet call from rxe_cq.c

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Remove the tasklet call in rxe_cq.c and also the is_dying in the
cq struct. There is no reason for the rxe driver to defer the call
to the cq completion handler by scheduling a tasklet. rxe_cq_post()
is not called in a hard irq context.

The rxe driver currently is incorrect because the tasklet call is
made without protecting the cq pointer with a reference from having
the underlying memory freed before the deferred routine is called.
Executing the comp_handler inline fixes this problem.

Fixes: 8700e3e7c4 ("Soft RoCE driver")
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Link: https://lore.kernel.org/r/20230327215643.10410-1-rpearsonhpe@gmail.com
Acked-by: Zhu Yanjun <zyjzyj2000@gmail.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Bob Pearson 2023-03-27 16:56:44 -05:00 committed by Leon Romanovsky
parent cba968e33e
commit 78b26a3353
3 changed files with 3 additions and 33 deletions
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32
drivers/infiniband/sw/rxe/rxe_cq.c
View file

@ -39,21 +39,6 @@ int rxe_cq_chk_attr(struct rxe_dev *rxe, struct rxe_cq *cq,
return -EINVAL;
}
static void rxe_send_complete(struct tasklet_struct *t)
{
struct rxe_cq *cq = from_tasklet(cq, t, comp_task);
unsigned long flags;
spin_lock_irqsave(&cq->cq_lock, flags);
if (cq->is_dying) {
spin_unlock_irqrestore(&cq->cq_lock, flags);
return;
}
spin_unlock_irqrestore(&cq->cq_lock, flags);
cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
}
int rxe_cq_from_init(struct rxe_dev *rxe, struct rxe_cq *cq, int cqe,
int comp_vector, struct ib_udata *udata,
struct rxe_create_cq_resp __user *uresp)
@ -79,10 +64,6 @@ int rxe_cq_from_init(struct rxe_dev *rxe, struct rxe_cq *cq, int cqe,
cq->is_user = uresp;
cq->is_dying = false;
tasklet_setup(&cq->comp_task, rxe_send_complete);
spin_lock_init(&cq->cq_lock);
cq->ibcq.cqe = cqe;
return 0;
@ -103,6 +84,7 @@ int rxe_cq_resize_queue(struct rxe_cq *cq, int cqe,
return err;
}
/* caller holds reference to cq */
int rxe_cq_post(struct rxe_cq *cq, struct rxe_cqe *cqe, int solicited)
{
struct ib_event ev;
@ -136,21 +118,13 @@ int rxe_cq_post(struct rxe_cq *cq, struct rxe_cqe *cqe, int solicited)
if ((cq->notify == IB_CQ_NEXT_COMP) ||
(cq->notify == IB_CQ_SOLICITED && solicited)) {
cq->notify = 0;
tasklet_schedule(&cq->comp_task);
cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
}
return 0;
}
void rxe_cq_disable(struct rxe_cq *cq)
{
unsigned long flags;
spin_lock_irqsave(&cq->cq_lock, flags);
cq->is_dying = true;
spin_unlock_irqrestore(&cq->cq_lock, flags);
}
void rxe_cq_cleanup(struct rxe_pool_elem *elem)
{
struct rxe_cq *cq = container_of(elem, typeof(*cq), elem);

2
drivers/infiniband/sw/rxe/rxe_verbs.c
View file

@ -1178,8 +1178,6 @@ static int rxe_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
goto err_out;
}
rxe_cq_disable(cq);
err = rxe_cleanup(cq);
if (err)
rxe_err_cq(cq, "cleanup failed, err = %d", err);

2
drivers/infiniband/sw/rxe/rxe_verbs.h
View file

@ -63,9 +63,7 @@ struct rxe_cq {
struct rxe_queue *queue;
spinlock_t cq_lock;
u8 notify;
bool is_dying;
bool is_user;
struct tasklet_struct comp_task;
atomic_t num_wq;
};