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 */
98