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
hfi1_put_txreq(struct verbs_txreq * tx)13 void 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
__get_txreq(struct hfi1_ibdev * dev,struct rvt_qp * qp)51 struct 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 }
75 out:
76 write_sequnlock(&dev->txwait_lock);
77 return tx;
78 }
79
verbs_txreq_init(struct hfi1_ibdev * dev)80 int 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
verbs_txreq_exit(struct hfi1_ibdev * dev)95 void verbs_txreq_exit(struct hfi1_ibdev *dev)
96 {
97 kmem_cache_destroy(dev->verbs_txreq_cache);
98 dev->verbs_txreq_cache = NULL;
99 }
100