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(size: sizeof(*s), GFP_KERNEL); |
44 | if (!s) |
45 | return NULL; |
46 | |
47 | s->srq_size = srq_size; |
48 | init_completion(x: &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(size: sizeof(*req), GFP_KERNEL); |
84 | if (!skb) |
85 | return -ENOMEM; |
86 | req = (struct cpl_srq_table_req *) |
87 | __skb_put_zero(skb, len: 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(x: &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(lock: &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 | |