1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /*
3 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
4 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
5 */
6 #include <linux/vmalloc.h>
7 #include "rxe.h"
8 #include "rxe_loc.h"
9 #include "rxe_queue.h"
10
rxe_cq_chk_attr(struct rxe_dev * rxe,struct rxe_cq * cq,int cqe,int comp_vector)11 int rxe_cq_chk_attr(struct rxe_dev *rxe, struct rxe_cq *cq,
12 int cqe, int comp_vector)
13 {
14 int count;
15
16 if (cqe <= 0) {
17 pr_warn("cqe(%d) <= 0\n", cqe);
18 goto err1;
19 }
20
21 if (cqe > rxe->attr.max_cqe) {
22 pr_debug("cqe(%d) > max_cqe(%d)\n",
23 cqe, rxe->attr.max_cqe);
24 goto err1;
25 }
26
27 if (cq) {
28 count = queue_count(cq->queue, QUEUE_TYPE_TO_CLIENT);
29 if (cqe < count) {
30 pr_debug("cqe(%d) < current # elements in queue (%d)",
31 cqe, count);
32 goto err1;
33 }
34 }
35
36 return 0;
37
38 err1:
39 return -EINVAL;
40 }
41
rxe_send_complete(struct tasklet_struct * t)42 static void rxe_send_complete(struct tasklet_struct *t)
43 {
44 struct rxe_cq *cq = from_tasklet(cq, t, comp_task);
45 unsigned long flags;
46
47 spin_lock_irqsave(&cq->cq_lock, flags);
48 if (cq->is_dying) {
49 spin_unlock_irqrestore(&cq->cq_lock, flags);
50 return;
51 }
52 spin_unlock_irqrestore(&cq->cq_lock, flags);
53
54 cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
55 }
56
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)57 int rxe_cq_from_init(struct rxe_dev *rxe, struct rxe_cq *cq, int cqe,
58 int comp_vector, struct ib_udata *udata,
59 struct rxe_create_cq_resp __user *uresp)
60 {
61 int err;
62 enum queue_type type;
63
64 type = QUEUE_TYPE_TO_CLIENT;
65 cq->queue = rxe_queue_init(rxe, &cqe,
66 sizeof(struct rxe_cqe), type);
67 if (!cq->queue) {
68 pr_warn("unable to create cq\n");
69 return -ENOMEM;
70 }
71
72 err = do_mmap_info(rxe, uresp ? &uresp->mi : NULL, udata,
73 cq->queue->buf, cq->queue->buf_size, &cq->queue->ip);
74 if (err) {
75 vfree(cq->queue->buf);
76 kfree(cq->queue);
77 return err;
78 }
79
80 cq->is_user = uresp;
81
82 cq->is_dying = false;
83
84 tasklet_setup(&cq->comp_task, rxe_send_complete);
85
86 spin_lock_init(&cq->cq_lock);
87 cq->ibcq.cqe = cqe;
88 return 0;
89 }
90
rxe_cq_resize_queue(struct rxe_cq * cq,int cqe,struct rxe_resize_cq_resp __user * uresp,struct ib_udata * udata)91 int rxe_cq_resize_queue(struct rxe_cq *cq, int cqe,
92 struct rxe_resize_cq_resp __user *uresp,
93 struct ib_udata *udata)
94 {
95 int err;
96
97 err = rxe_queue_resize(cq->queue, (unsigned int *)&cqe,
98 sizeof(struct rxe_cqe), udata,
99 uresp ? &uresp->mi : NULL, NULL, &cq->cq_lock);
100 if (!err)
101 cq->ibcq.cqe = cqe;
102
103 return err;
104 }
105
rxe_cq_post(struct rxe_cq * cq,struct rxe_cqe * cqe,int solicited)106 int rxe_cq_post(struct rxe_cq *cq, struct rxe_cqe *cqe, int solicited)
107 {
108 struct ib_event ev;
109 int full;
110 void *addr;
111 unsigned long flags;
112
113 spin_lock_irqsave(&cq->cq_lock, flags);
114
115 full = queue_full(cq->queue, QUEUE_TYPE_TO_CLIENT);
116 if (unlikely(full)) {
117 spin_unlock_irqrestore(&cq->cq_lock, flags);
118 if (cq->ibcq.event_handler) {
119 ev.device = cq->ibcq.device;
120 ev.element.cq = &cq->ibcq;
121 ev.event = IB_EVENT_CQ_ERR;
122 cq->ibcq.event_handler(&ev, cq->ibcq.cq_context);
123 }
124
125 return -EBUSY;
126 }
127
128 addr = queue_producer_addr(cq->queue, QUEUE_TYPE_TO_CLIENT);
129 memcpy(addr, cqe, sizeof(*cqe));
130
131 queue_advance_producer(cq->queue, QUEUE_TYPE_TO_CLIENT);
132
133 spin_unlock_irqrestore(&cq->cq_lock, flags);
134
135 if ((cq->notify == IB_CQ_NEXT_COMP) ||
136 (cq->notify == IB_CQ_SOLICITED && solicited)) {
137 cq->notify = 0;
138 tasklet_schedule(&cq->comp_task);
139 }
140
141 return 0;
142 }
143
rxe_cq_disable(struct rxe_cq * cq)144 void rxe_cq_disable(struct rxe_cq *cq)
145 {
146 unsigned long flags;
147
148 spin_lock_irqsave(&cq->cq_lock, flags);
149 cq->is_dying = true;
150 spin_unlock_irqrestore(&cq->cq_lock, flags);
151 }
152
rxe_cq_cleanup(struct rxe_pool_elem * elem)153 void rxe_cq_cleanup(struct rxe_pool_elem *elem)
154 {
155 struct rxe_cq *cq = container_of(elem, typeof(*cq), elem);
156
157 if (cq->queue)
158 rxe_queue_cleanup(cq->queue);
159 }
160