RDMA/rxe: Convert tasklet args to queue pairs

Originally is was thought that the tasklet machinery in rxe_task.c would
be used in other applications but that has not happened for years. This
patch replaces the 'void *arg' by struct 'rxe_qp *qp' in the parameters to
the tasklet calls. This change will have no affect on performance but may
make the code a little clearer.

Link: https://lore.kernel.org/r/20230304174533.11296-2-rpearsonhpe@gmail.com
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/sw/rxe/rxe_comp.c

@@ -575,9 +575,8 @@ static void free_pkt(struct rxe_pkt_info *pkt)
 	ib_device_put(dev);
 }
 
-int rxe_completer(void *arg)
+int rxe_completer(struct rxe_qp *qp)
 {
-	struct rxe_qp *qp = (struct rxe_qp *)arg;
 	struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 	struct rxe_send_wqe *wqe = NULL;
 	struct sk_buff *skb = NULL;

drivers/infiniband/sw/rxe/rxe_loc.h

@@ -170,9 +170,9 @@ void rxe_srq_cleanup(struct rxe_pool_elem *elem);
 
 void rxe_dealloc(struct ib_device *ib_dev);
 
-int rxe_completer(void *arg);
-int rxe_requester(void *arg);
-int rxe_responder(void *arg);
+int rxe_completer(struct rxe_qp *qp);
+int rxe_requester(struct rxe_qp *qp);
+int rxe_responder(struct rxe_qp *qp);
 
 /* rxe_icrc.c */
 int rxe_icrc_init(struct rxe_dev *rxe);

drivers/infiniband/sw/rxe/rxe_req.c

@@ -635,9 +635,8 @@ static int rxe_do_local_ops(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
 	return 0;
 }
 
-int rxe_requester(void *arg)
+int rxe_requester(struct rxe_qp *qp)
 {
-	struct rxe_qp *qp = (struct rxe_qp *)arg;
 	struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 	struct rxe_pkt_info pkt;
 	struct sk_buff *skb;

drivers/infiniband/sw/rxe/rxe_resp.c

@@ -1443,9 +1443,8 @@ static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
 		queue_advance_consumer(q, q->type);
 }
 
-int rxe_responder(void *arg)
+int rxe_responder(struct rxe_qp *qp)
 {
-	struct rxe_qp *qp = (struct rxe_qp *)arg;
 	struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 	enum resp_states state;
 	struct rxe_pkt_info *pkt = NULL;

drivers/infiniband/sw/rxe/rxe_task.c

@@ -11,7 +11,7 @@ int __rxe_do_task(struct rxe_task *task)
 {
 	int ret;
 
-	while ((ret = task->func(task->arg)) == 0)
+	while ((ret = task->func(task->qp)) == 0)
 		;
 
 	task->ret = ret;
@@ -29,7 +29,7 @@ static void do_task(struct tasklet_struct *t)
 	int cont;
 	int ret;
 	struct rxe_task *task = from_tasklet(task, t, tasklet);
-	struct rxe_qp *qp = (struct rxe_qp *)task->arg;
+	struct rxe_qp *qp = (struct rxe_qp *)task->qp;
 	unsigned int iterations = RXE_MAX_ITERATIONS;
 
 	spin_lock_bh(&task->lock);
@@ -54,7 +54,7 @@ static void do_task(struct tasklet_struct *t)
 
 	do {
 		cont = 0;
-		ret = task->func(task->arg);
+		ret = task->func(task->qp);
 
 		spin_lock_bh(&task->lock);
 		switch (task->state) {
@@ -91,9 +91,10 @@ static void do_task(struct tasklet_struct *t)
 	task->ret = ret;
 }
 
-int rxe_init_task(struct rxe_task *task, void *arg, int (*func)(void *))
+int rxe_init_task(struct rxe_task *task, struct rxe_qp *qp,
+		  int (*func)(struct rxe_qp *))
 {
-	task->arg	= arg;
+	task->qp	= qp;
 	task->func	= func;
 	task->destroyed	= false;
 

drivers/infiniband/sw/rxe/rxe_task.h

@@ -22,18 +22,19 @@ struct rxe_task {
 	struct tasklet_struct	tasklet;
 	int			state;
 	spinlock_t		lock;
-	void			*arg;
-	int			(*func)(void *arg);
+	struct rxe_qp		*qp;
+	int			(*func)(struct rxe_qp *qp);
 	int			ret;
 	bool			destroyed;
 };
 
 /*
  * init rxe_task structure
- *	arg  => parameter to pass to fcn
+ *	qp  => parameter to pass to func
  *	func => function to call until it returns != 0
  */
-int rxe_init_task(struct rxe_task *task, void *arg, int (*func)(void *));
+int rxe_init_task(struct rxe_task *task, struct rxe_qp *qp,
+		  int (*func)(struct rxe_qp *));
 
 /* cleanup task */
 void rxe_cleanup_task(struct rxe_task *task);