1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright(c) 2016 - 2018 Intel Corporation.
4 */
5
6#include "hfi.h"
7#include "verbs_txreq.h"
8#include "qp.h"
9#include "trace.h"
10
11#define TXREQ_LEN 24
12
13void hfi1_put_txreq(struct verbs_txreq *tx)
14{
15	struct hfi1_ibdev *dev;
16	struct rvt_qp *qp;
17	unsigned long flags;
18	unsigned int seq;
19	struct hfi1_qp_priv *priv;
20
21	qp = tx->qp;
22	dev = to_idev(qp->ibqp.device);
23
24	if (tx->mr)
25		rvt_put_mr(tx->mr);
26
27	sdma_txclean(dd_from_dev(dev), &tx->txreq);
28
29	/* Free verbs_txreq and return to slab cache */
30	kmem_cache_free(dev->verbs_txreq_cache, tx);
31
32	do {
33		seq = read_seqbegin(&dev->txwait_lock);
34		if (!list_empty(&dev->txwait)) {
35			struct iowait *wait;
36
37			write_seqlock_irqsave(&dev->txwait_lock, flags);
38			wait = list_first_entry(&dev->txwait, struct iowait,
39						list);
40			qp = iowait_to_qp(wait);
41			priv = qp->priv;
42			list_del_init(&priv->s_iowait.list);
43			/* refcount held until actual wake up */
44			write_sequnlock_irqrestore(&dev->txwait_lock, flags);
45			hfi1_qp_wakeup(qp, RVT_S_WAIT_TX);
46			break;
47		}
48	} while (read_seqretry(&dev->txwait_lock, seq));
49}
50
51struct verbs_txreq *__get_txreq(struct hfi1_ibdev *dev,
52				struct rvt_qp *qp)
53	__must_hold(&qp->s_lock)
54{
55	struct verbs_txreq *tx = NULL;
56
57	write_seqlock(&dev->txwait_lock);
58	if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
59		struct hfi1_qp_priv *priv;
60
61		tx = kmem_cache_alloc(dev->verbs_txreq_cache, VERBS_TXREQ_GFP);
62		if (tx)
63			goto out;
64		priv = qp->priv;
65		if (list_empty(&priv->s_iowait.list)) {
66			dev->n_txwait++;
67			qp->s_flags |= RVT_S_WAIT_TX;
68			list_add_tail(&priv->s_iowait.list, &dev->txwait);
69			priv->s_iowait.lock = &dev->txwait_lock;
70			trace_hfi1_qpsleep(qp, RVT_S_WAIT_TX);
71			rvt_get_qp(qp);
72		}
73		qp->s_flags &= ~RVT_S_BUSY;
74	}
75out:
76	write_sequnlock(&dev->txwait_lock);
77	return tx;
78}
79
80int verbs_txreq_init(struct hfi1_ibdev *dev)
81{
82	char buf[TXREQ_LEN];
83	struct hfi1_devdata *dd = dd_from_dev(dev);
84
85	snprintf(buf, sizeof(buf), "hfi1_%u_vtxreq_cache", dd->unit);
86	dev->verbs_txreq_cache = kmem_cache_create(buf,
87						   sizeof(struct verbs_txreq),
88						   0, SLAB_HWCACHE_ALIGN,
89						   NULL);
90	if (!dev->verbs_txreq_cache)
91		return -ENOMEM;
92	return 0;
93}
94
95void verbs_txreq_exit(struct hfi1_ibdev *dev)
96{
97	kmem_cache_destroy(dev->verbs_txreq_cache);
98	dev->verbs_txreq_cache = NULL;
99}
100