linux/net/smc/smc_wr.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Shared Memory Communications over RDMA (SMC-R) and RoCE
 *
 * Work Requests exploiting Infiniband API
 *
 * Copyright IBM Corp. 2016
 *
 * Author(s):  Steffen Maier <[email protected]>
 */

#ifndef SMC_WR_H
#define SMC_WR_H

#include <linux/atomic.h>
#include <rdma/ib_verbs.h>
#include <asm/div64.h>

#include "smc.h"
#include "smc_core.h"

#define SMC_WR_BUF_CNT …

#define SMC_WR_TX_WAIT_FREE_SLOT_TIME …

#define SMC_WR_TX_SIZE …

#define SMC_WR_TX_PEND_PRIV_SIZE …

struct smc_wr_tx_pend_priv { … };

smc_wr_tx_handler;

smc_wr_tx_filter;

smc_wr_tx_dismisser;

struct smc_wr_rx_handler { … };

/* Only used by RDMA write WRs.
 * All other WRs (CDC/LLC) use smc_wr_tx_send handling WR_ID implicitly
 */
static inline long smc_wr_tx_get_next_wr_id(struct smc_link *link)
{ … }

static inline void smc_wr_tx_set_wr_id(atomic_long_t *wr_tx_id, long val)
{ … }

static inline bool smc_wr_tx_link_hold(struct smc_link *link)
{ … }

static inline void smc_wr_tx_link_put(struct smc_link *link)
{ … }

static inline void smc_wr_drain_cq(struct smc_link *lnk)
{ … }

static inline void smc_wr_wakeup_tx_wait(struct smc_link *lnk)
{ … }

static inline void smc_wr_wakeup_reg_wait(struct smc_link *lnk)
{ … }

/* post a new receive work request to fill a completed old work request entry */
static inline int smc_wr_rx_post(struct smc_link *link)
{ … }

int smc_wr_create_link(struct smc_link *lnk);
int smc_wr_alloc_link_mem(struct smc_link *lnk);
int smc_wr_alloc_lgr_mem(struct smc_link_group *lgr);
void smc_wr_free_link(struct smc_link *lnk);
void smc_wr_free_link_mem(struct smc_link *lnk);
void smc_wr_free_lgr_mem(struct smc_link_group *lgr);
void smc_wr_remember_qp_attr(struct smc_link *lnk);
void smc_wr_remove_dev(struct smc_ib_device *smcibdev);
void smc_wr_add_dev(struct smc_ib_device *smcibdev);

int smc_wr_tx_get_free_slot(struct smc_link *link, smc_wr_tx_handler handler,
			    struct smc_wr_buf **wr_buf,
			    struct smc_rdma_wr **wrs,
			    struct smc_wr_tx_pend_priv **wr_pend_priv);
int smc_wr_tx_get_v2_slot(struct smc_link *link,
			  smc_wr_tx_handler handler,
			  struct smc_wr_v2_buf **wr_buf,
			  struct smc_wr_tx_pend_priv **wr_pend_priv);
int smc_wr_tx_put_slot(struct smc_link *link,
		       struct smc_wr_tx_pend_priv *wr_pend_priv);
int smc_wr_tx_send(struct smc_link *link,
		   struct smc_wr_tx_pend_priv *wr_pend_priv);
int smc_wr_tx_v2_send(struct smc_link *link,
		      struct smc_wr_tx_pend_priv *priv, int len);
int smc_wr_tx_send_wait(struct smc_link *link, struct smc_wr_tx_pend_priv *priv,
			unsigned long timeout);
void smc_wr_tx_cq_handler(struct ib_cq *ib_cq, void *cq_context);
void smc_wr_tx_wait_no_pending_sends(struct smc_link *link);

int smc_wr_rx_register_handler(struct smc_wr_rx_handler *handler);
int smc_wr_rx_post_init(struct smc_link *link);
void smc_wr_rx_cq_handler(struct ib_cq *ib_cq, void *cq_context);
int smc_wr_reg_send(struct smc_link *link, struct ib_mr *mr);

#endif /* SMC_WR_H */