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