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[J-linux.git] / drivers / infiniband / hw / hfi1 / sdma_txreq.h
1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2 /*
3  * Copyright(c) 2016 Intel Corporation.
4  */
5
6 #ifndef HFI1_SDMA_TXREQ_H
7 #define HFI1_SDMA_TXREQ_H
8
9 /* increased for AHG */
10 #define NUM_DESC 6
11
12 /*
13  * struct sdma_desc - canonical fragment descriptor
14  *
15  * This is the descriptor carried in the tx request
16  * corresponding to each fragment.
17  *
18  */
19 struct sdma_desc {
20         /* private:  don't use directly */
21         u64 qw[2];
22         void *pinning_ctx;
23         /* Release reference to @pinning_ctx. May be called in interrupt context. Must not sleep. */
24         void (*ctx_put)(void *ctx);
25 };
26
27 /**
28  * struct sdma_txreq - the sdma_txreq structure (one per packet)
29  * @list: for use by user and by queuing for wait
30  *
31  * This is the representation of a packet which consists of some
32  * number of fragments.   Storage is provided to within the structure.
33  * for all fragments.
34  *
35  * The storage for the descriptors are automatically extended as needed
36  * when the currently allocation is exceeded.
37  *
38  * The user (Verbs or PSM) may overload this structure with fields
39  * specific to their use by putting this struct first in their struct.
40  * The method of allocation of the overloaded structure is user dependent
41  *
42  * The list is the only public field in the structure.
43  *
44  */
45
46 #define SDMA_TXREQ_S_OK        0
47 #define SDMA_TXREQ_S_SENDERROR 1
48 #define SDMA_TXREQ_S_ABORTED   2
49 #define SDMA_TXREQ_S_SHUTDOWN  3
50
51 /* flags bits */
52 #define SDMA_TXREQ_F_URGENT       0x0001
53 #define SDMA_TXREQ_F_AHG_COPY     0x0002
54 #define SDMA_TXREQ_F_USE_AHG      0x0004
55 #define SDMA_TXREQ_F_VIP          0x0010
56
57 struct sdma_txreq;
58 typedef void (*callback_t)(struct sdma_txreq *, int);
59
60 struct iowait;
61 struct sdma_txreq {
62         struct list_head list;
63         /* private: */
64         struct sdma_desc *descp;
65         /* private: */
66         void *coalesce_buf;
67         /* private: */
68         struct iowait *wait;
69         /* private: */
70         callback_t                  complete;
71 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
72         u64 sn;
73 #endif
74         /* private: - used in coalesce/pad processing */
75         u16                         packet_len;
76         /* private: - down-counted to trigger last */
77         u16                         tlen;
78         /* private: */
79         u16                         num_desc;
80         /* private: */
81         u16                         desc_limit;
82         /* private: */
83         u16                         next_descq_idx;
84         /* private: */
85         u16 coalesce_idx;
86         /* private: flags */
87         u16                         flags;
88         /* private: */
89         struct sdma_desc descs[NUM_DESC];
90 };
91
92 static inline int sdma_txreq_built(struct sdma_txreq *tx)
93 {
94         return tx->num_desc;
95 }
96
97 #endif                          /* HFI1_SDMA_TXREQ_H */
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