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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_H7#define HFI1_SDMA_TXREQ_H8 9/* increased for AHG */10#define NUM_DESC 611 12/*13 * struct sdma_desc - canonical fragment descriptor14 *15 * This is the descriptor carried in the tx request16 * corresponding to each fragment.17 *18 */19struct 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 wait30 *31 * This is the representation of a packet which consists of some32 * 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 needed36 * when the currently allocation is exceeded.37 *38 * The user (Verbs or PSM) may overload this structure with fields39 * specific to their use by putting this struct first in their struct.40 * The method of allocation of the overloaded structure is user dependent41 *42 * The list is the only public field in the structure.43 *44 */45 46#define SDMA_TXREQ_S_OK 047#define SDMA_TXREQ_S_SENDERROR 148#define SDMA_TXREQ_S_ABORTED 249#define SDMA_TXREQ_S_SHUTDOWN 350 51/* flags bits */52#define SDMA_TXREQ_F_URGENT 0x000153#define SDMA_TXREQ_F_AHG_COPY 0x000254#define SDMA_TXREQ_F_USE_AHG 0x000455#define SDMA_TXREQ_F_VIP 0x001056 57struct sdma_txreq;58typedef void (*callback_t)(struct sdma_txreq *, int);59 60struct iowait;61struct 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_ORDER72 u64 sn;73#endif74 /* 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 92static inline int sdma_txreq_built(struct sdma_txreq *tx)93{94 return tx->num_desc;95}96 97#endif /* HFI1_SDMA_TXREQ_H */98