1 /*
2  * Copyright(c) 2016 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,
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40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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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_SDMA_TXREQ_H
49 #define HFI1_SDMA_TXREQ_H
50 
51 /* increased for AHG */
52 #define NUM_DESC 6
53 
54 /*
55  * struct sdma_desc - canonical fragment descriptor
56  *
57  * This is the descriptor carried in the tx request
58  * corresponding to each fragment.
59  *
60  */
61 struct sdma_desc {
62 	/* private:  don't use directly */
63 	u64 qw[2];
64 };
65 
66 /**
67  * struct sdma_txreq - the sdma_txreq structure (one per packet)
68  * @list: for use by user and by queuing for wait
69  *
70  * This is the representation of a packet which consists of some
71  * number of fragments.   Storage is provided to within the structure.
72  * for all fragments.
73  *
74  * The storage for the descriptors are automatically extended as needed
75  * when the currently allocation is exceeded.
76  *
77  * The user (Verbs or PSM) may overload this structure with fields
78  * specific to their use by putting this struct first in their struct.
79  * The method of allocation of the overloaded structure is user dependent
80  *
81  * The list is the only public field in the structure.
82  *
83  */
84 
85 #define SDMA_TXREQ_S_OK        0
86 #define SDMA_TXREQ_S_SENDERROR 1
87 #define SDMA_TXREQ_S_ABORTED   2
88 #define SDMA_TXREQ_S_SHUTDOWN  3
89 
90 /* flags bits */
91 #define SDMA_TXREQ_F_URGENT       0x0001
92 #define SDMA_TXREQ_F_AHG_COPY     0x0002
93 #define SDMA_TXREQ_F_USE_AHG      0x0004
94 
95 struct sdma_txreq;
96 typedef void (*callback_t)(struct sdma_txreq *, int);
97 
98 struct iowait;
99 struct sdma_txreq {
100 	struct list_head list;
101 	/* private: */
102 	struct sdma_desc *descp;
103 	/* private: */
104 	void *coalesce_buf;
105 	/* private: */
106 	struct iowait *wait;
107 	/* private: */
108 	callback_t                  complete;
109 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
110 	u64 sn;
111 #endif
112 	/* private: - used in coalesce/pad processing */
113 	u16                         packet_len;
114 	/* private: - down-counted to trigger last */
115 	u16                         tlen;
116 	/* private: */
117 	u16                         num_desc;
118 	/* private: */
119 	u16                         desc_limit;
120 	/* private: */
121 	u16                         next_descq_idx;
122 	/* private: */
123 	u16 coalesce_idx;
124 	/* private: flags */
125 	u16                         flags;
126 	/* private: */
127 	struct sdma_desc descs[NUM_DESC];
128 };
129 
130 static inline int sdma_txreq_built(struct sdma_txreq *tx)
131 {
132 	return tx->num_desc;
133 }
134 
135 #endif                          /* HFI1_SDMA_TXREQ_H */
136