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 }; 24 25 /** 26 * struct sdma_txreq - the sdma_txreq structure (one per packet) 27 * @list: for use by user and by queuing for wait 28 * 29 * This is the representation of a packet which consists of some 30 * number of fragments. Storage is provided to within the structure. 31 * for all fragments. 32 * 33 * The storage for the descriptors are automatically extended as needed 34 * when the currently allocation is exceeded. 35 * 36 * The user (Verbs or PSM) may overload this structure with fields 37 * specific to their use by putting this struct first in their struct. 38 * The method of allocation of the overloaded structure is user dependent 39 * 40 * The list is the only public field in the structure. 41 * 42 */ 43 44 #define SDMA_TXREQ_S_OK 0 45 #define SDMA_TXREQ_S_SENDERROR 1 46 #define SDMA_TXREQ_S_ABORTED 2 47 #define SDMA_TXREQ_S_SHUTDOWN 3 48 49 /* flags bits */ 50 #define SDMA_TXREQ_F_URGENT 0x0001 51 #define SDMA_TXREQ_F_AHG_COPY 0x0002 52 #define SDMA_TXREQ_F_USE_AHG 0x0004 53 #define SDMA_TXREQ_F_VIP 0x0010 54 55 struct sdma_txreq; 56 typedef void (*callback_t)(struct sdma_txreq *, int); 57 58 struct iowait; 59 struct sdma_txreq { 60 struct list_head list; 61 /* private: */ 62 struct sdma_desc *descp; 63 /* private: */ 64 void *coalesce_buf; 65 /* private: */ 66 struct iowait *wait; 67 /* private: */ 68 callback_t complete; 69 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER 70 u64 sn; 71 #endif 72 /* private: - used in coalesce/pad processing */ 73 u16 packet_len; 74 /* private: - down-counted to trigger last */ 75 u16 tlen; 76 /* private: */ 77 u16 num_desc; 78 /* private: */ 79 u16 desc_limit; 80 /* private: */ 81 u16 next_descq_idx; 82 /* private: */ 83 u16 coalesce_idx; 84 /* private: flags */ 85 u16 flags; 86 /* private: */ 87 struct sdma_desc descs[NUM_DESC]; 88 }; 89 90 static inline int sdma_txreq_built(struct sdma_txreq *tx) 91 { 92 return tx->num_desc; 93 } 94 95 #endif /* HFI1_SDMA_TXREQ_H */ 96