1 /*
2  * Copyright(c) 2016 - 2018 Intel Corporation.
3  *
4  * This file is provided under a dual BSD/GPLv2 license.  When using or
5  * redistributing this file, you may do so under either license.
6  *
7  * GPL LICENSE SUMMARY
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of version 2 of the GNU General Public License as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
18  * BSD LICENSE
19  *
20  * Redistribution and use in source and binary forms, with or without
21  * modification, are permitted provided that the following conditions
22  * are met:
23  *
24  *  - Redistributions of source code must retain the above copyright
25  *    notice, this list of conditions and the following disclaimer.
26  *  - Redistributions in binary form must reproduce the above copyright
27  *    notice, this list of conditions and the following disclaimer in
28  *    the documentation and/or other materials provided with the
29  *    distribution.
30  *  - Neither the name of Intel Corporation nor the names of its
31  *    contributors may be used to endorse or promote products derived
32  *    from this software without specific prior written permission.
33  *
34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45  *
46  */
47 
48 #ifndef HFI1_VERBS_TXREQ_H
49 #define HFI1_VERBS_TXREQ_H
50 
51 #include <linux/types.h>
52 #include <linux/slab.h>
53 
54 #include "verbs.h"
55 #include "sdma_txreq.h"
56 #include "iowait.h"
57 
58 struct verbs_txreq {
59 	struct hfi1_sdma_header	phdr;
60 	struct sdma_txreq       txreq;
61 	struct rvt_qp           *qp;
62 	struct rvt_swqe         *wqe;
63 	struct rvt_mregion	*mr;
64 	struct rvt_sge_state    *ss;
65 	struct sdma_engine     *sde;
66 	struct send_context     *psc;
67 	u16                     hdr_dwords;
68 	u16			s_cur_size;
69 };
70 
71 struct hfi1_ibdev;
72 struct verbs_txreq *__get_txreq(struct hfi1_ibdev *dev,
73 				struct rvt_qp *qp);
74 
75 #define VERBS_TXREQ_GFP (GFP_ATOMIC | __GFP_NOWARN)
76 static inline struct verbs_txreq *get_txreq(struct hfi1_ibdev *dev,
77 					    struct rvt_qp *qp)
78 	__must_hold(&qp->slock)
79 {
80 	struct verbs_txreq *tx;
81 	struct hfi1_qp_priv *priv = qp->priv;
82 
83 	tx = kmem_cache_alloc(dev->verbs_txreq_cache, VERBS_TXREQ_GFP);
84 	if (unlikely(!tx)) {
85 		/* call slow path to get the lock */
86 		tx = __get_txreq(dev, qp);
87 		if (!tx)
88 			return tx;
89 	}
90 	tx->qp = qp;
91 	tx->mr = NULL;
92 	tx->sde = priv->s_sde;
93 	tx->psc = priv->s_sendcontext;
94 	/* so that we can test if the sdma descriptors are there */
95 	tx->txreq.num_desc = 0;
96 	/* Set the header type */
97 	tx->phdr.hdr.hdr_type = priv->hdr_type;
98 	tx->txreq.flags = 0;
99 	return tx;
100 }
101 
102 static inline struct verbs_txreq *get_waiting_verbs_txreq(struct iowait_work *w)
103 {
104 	struct sdma_txreq *stx;
105 
106 	stx = iowait_get_txhead(w);
107 	if (stx)
108 		return container_of(stx, struct verbs_txreq, txreq);
109 	return NULL;
110 }
111 
112 static inline bool verbs_txreq_queued(struct iowait_work *w)
113 {
114 	return iowait_packet_queued(w);
115 }
116 
117 void hfi1_put_txreq(struct verbs_txreq *tx);
118 int verbs_txreq_init(struct hfi1_ibdev *dev);
119 void verbs_txreq_exit(struct hfi1_ibdev *dev);
120 
121 #endif                         /* HFI1_VERBS_TXREQ_H */
122