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 }