98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
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/*
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* Copyright(c) 2016 Intel Corporation.
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*/
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#ifndef HFI1_SDMA_TXREQ_H
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#define HFI1_SDMA_TXREQ_H
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/* increased for AHG */
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#define NUM_DESC 6
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/*
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* struct sdma_desc - canonical fragment descriptor
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*
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* This is the descriptor carried in the tx request
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* corresponding to each fragment.
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*
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*/
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struct sdma_desc {
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/* private: don't use directly */
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u64 qw[2];
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void *pinning_ctx;
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/* Release reference to @pinning_ctx. May be called in interrupt context. Must not sleep. */
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void (*ctx_put)(void *ctx);
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};
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/**
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* struct sdma_txreq - the sdma_txreq structure (one per packet)
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* @list: for use by user and by queuing for wait
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*
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* This is the representation of a packet which consists of some
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* number of fragments. Storage is provided to within the structure.
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* for all fragments.
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*
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* The storage for the descriptors are automatically extended as needed
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* when the currently allocation is exceeded.
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*
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* The user (Verbs or PSM) may overload this structure with fields
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* specific to their use by putting this struct first in their struct.
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* The method of allocation of the overloaded structure is user dependent
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*
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* The list is the only public field in the structure.
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*
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*/
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#define SDMA_TXREQ_S_OK 0
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#define SDMA_TXREQ_S_SENDERROR 1
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#define SDMA_TXREQ_S_ABORTED 2
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#define SDMA_TXREQ_S_SHUTDOWN 3
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/* flags bits */
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#define SDMA_TXREQ_F_URGENT 0x0001
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#define SDMA_TXREQ_F_AHG_COPY 0x0002
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#define SDMA_TXREQ_F_USE_AHG 0x0004
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#define SDMA_TXREQ_F_VIP 0x0010
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struct sdma_txreq;
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typedef void (*callback_t)(struct sdma_txreq *, int);
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struct iowait;
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struct sdma_txreq {
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struct list_head list;
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/* private: */
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struct sdma_desc *descp;
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/* private: */
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void *coalesce_buf;
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/* private: */
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struct iowait *wait;
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/* private: */
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callback_t complete;
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#ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
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u64 sn;
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#endif
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/* private: - used in coalesce/pad processing */
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u16 packet_len;
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/* private: - down-counted to trigger last */
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u16 tlen;
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/* private: */
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u16 num_desc;
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/* private: */
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u16 desc_limit;
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/* private: */
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u16 next_descq_idx;
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/* private: */
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u16 coalesce_idx;
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/* private: flags */
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u16 flags;
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/* private: */
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struct sdma_desc descs[NUM_DESC];
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};
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static inline int sdma_txreq_built(struct sdma_txreq *tx)
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{
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return tx->num_desc;
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}
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#endif /* HFI1_SDMA_TXREQ_H */
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