1 /*
2  * This file is part of the Chelsio T6 Ethernet driver for Linux.
3  *
4  * Copyright (c) 2017-2018 Chelsio Communications, Inc. All rights reserved.
5  *
6  * This software is available to you under a choice of one of two
7  * licenses.  You may choose to be licensed under the terms of the GNU
8  * General Public License (GPL) Version 2, available from the file
9  * COPYING in the main directory of this source tree, or the
10  * OpenIB.org BSD license below:
11  *
12  *     Redistribution and use in source and binary forms, with or
13  *     without modification, are permitted provided that the following
14  *     conditions are met:
15  *
16  *      - Redistributions of source code must retain the above
17  *        copyright notice, this list of conditions and the following
18  *        disclaimer.
19  *
20  *      - Redistributions in binary form must reproduce the above
21  *        copyright notice, this list of conditions and the following
22  *        disclaimer in the documentation and/or other materials
23  *        provided with the distribution.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32  * SOFTWARE.
33  */
34 
35 #include "cxgb4.h"
36 #include "t4_msg.h"
37 #include "srq.h"
38 
39 struct srq_data *t4_init_srq(int srq_size)
40 {
41 	struct srq_data *s;
42 
43 	s = kvzalloc(sizeof(*s), GFP_KERNEL);
44 	if (!s)
45 		return NULL;
46 
47 	s->srq_size = srq_size;
48 	init_completion(&s->comp);
49 	mutex_init(&s->lock);
50 
51 	return s;
52 }
53 
54 /* cxgb4_get_srq_entry: read the SRQ table entry
55  * @dev: Pointer to the net_device
56  * @idx: Index to the srq
57  * @entryp: pointer to the srq entry
58  *
59  * Sends CPL_SRQ_TABLE_REQ message for the given index.
60  * Contents will be returned in CPL_SRQ_TABLE_RPL message.
61  *
62  * Returns zero if the read is successful, else a error
63  * number will be returned. Caller should not use the srq
64  * entry if the return value is non-zero.
65  *
66  *
67  */
68 int cxgb4_get_srq_entry(struct net_device *dev,
69 			int srq_idx, struct srq_entry *entryp)
70 {
71 	struct cpl_srq_table_req *req;
72 	struct adapter *adap;
73 	struct sk_buff *skb;
74 	struct srq_data *s;
75 	int rc = -ENODEV;
76 
77 	adap = netdev2adap(dev);
78 	s = adap->srq;
79 
80 	if (!(adap->flags & CXGB4_FULL_INIT_DONE) || !s)
81 		goto out;
82 
83 	skb = alloc_skb(sizeof(*req), GFP_KERNEL);
84 	if (!skb)
85 		return -ENOMEM;
86 	req = (struct cpl_srq_table_req *)
87 		__skb_put_zero(skb, sizeof(*req));
88 	INIT_TP_WR(req, 0);
89 	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SRQ_TABLE_REQ,
90 					      TID_TID_V(srq_idx) |
91 				TID_QID_V(adap->sge.fw_evtq.abs_id)));
92 	req->idx = srq_idx;
93 
94 	mutex_lock(&s->lock);
95 
96 	s->entryp = entryp;
97 	t4_mgmt_tx(adap, skb);
98 
99 	rc = wait_for_completion_timeout(&s->comp, SRQ_WAIT_TO);
100 	if (rc)
101 		rc = 0;
102 	else /* !rc means we timed out */
103 		rc = -ETIMEDOUT;
104 
105 	WARN_ON_ONCE(entryp->idx != srq_idx);
106 	mutex_unlock(&s->lock);
107 out:
108 	return rc;
109 }
110 EXPORT_SYMBOL(cxgb4_get_srq_entry);
111 
112 void do_srq_table_rpl(struct adapter *adap,
113 		      const struct cpl_srq_table_rpl *rpl)
114 {
115 	unsigned int idx = TID_TID_G(GET_TID(rpl));
116 	struct srq_data *s = adap->srq;
117 	struct srq_entry *e;
118 
119 	if (unlikely(rpl->status != CPL_CONTAINS_READ_RPL)) {
120 		dev_err(adap->pdev_dev,
121 			"Unexpected SRQ_TABLE_RPL status %u for entry %u\n",
122 				rpl->status, idx);
123 		goto out;
124 	}
125 
126 	/* Store the read entry */
127 	e = s->entryp;
128 	e->valid = 1;
129 	e->idx = idx;
130 	e->pdid = SRQT_PDID_G(be64_to_cpu(rpl->rsvd_pdid));
131 	e->qlen = SRQT_QLEN_G(be32_to_cpu(rpl->qlen_qbase));
132 	e->qbase = SRQT_QBASE_G(be32_to_cpu(rpl->qlen_qbase));
133 	e->cur_msn = be16_to_cpu(rpl->cur_msn);
134 	e->max_msn = be16_to_cpu(rpl->max_msn);
135 out:
136 	complete(&s->comp);
137 }
138