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Release 4.11 net/smc/smc_wr.h

Directory: net/smc
/*
 * Shared Memory Communications over RDMA (SMC-R) and RoCE
 *
 * Work Requests exploiting Infiniband API
 *
 * Copyright IBM Corp. 2016
 *
 * Author(s):  Steffen Maier <maier@linux.vnet.ibm.com>
 */

#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_MAX_CQE 32768	
/* max. # of completion queue elements */

#define SMC_WR_BUF_CNT 16	
/* # of ctrl buffers per link */


#define SMC_WR_TX_WAIT_FREE_SLOT_TIME	(10 * HZ)

#define SMC_WR_TX_WAIT_PENDING_TIME	(5 * HZ)


#define SMC_WR_TX_SIZE 44 
/* actual size of wr_send data (<=SMC_WR_BUF_SIZE) */


#define SMC_WR_TX_PEND_PRIV_SIZE 32


struct smc_wr_tx_pend_priv {
	
u8			priv[SMC_WR_TX_PEND_PRIV_SIZE];
};


typedef void (*smc_wr_tx_handler)(struct smc_wr_tx_pend_priv *,
				  struct smc_link *,
				  enum ib_wc_status);


typedef bool (*smc_wr_tx_filter)(struct smc_wr_tx_pend_priv *,
				 unsigned long);


typedef void (*smc_wr_tx_dismisser)(struct smc_wr_tx_pend_priv *);


struct smc_wr_rx_handler {
	
struct hlist_node	list;	/* hash table collision resolution */
	
void			(*handler)(struct ib_wc *, void *);
	
u8			type;
};

/* 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) { return atomic_long_inc_return(&link->wr_tx_id); }

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

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/* 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) { struct ib_recv_wr *bad_recv_wr = NULL; int rc; u64 wr_id, temp_wr_id; u32 index; wr_id = ++link->wr_rx_id; /* tasklet context, thus not atomic */ temp_wr_id = wr_id; index = do_div(temp_wr_id, link->wr_rx_cnt); link->wr_rx_ibs[index].wr_id = wr_id; rc = ib_post_recv(link->roce_qp, &link->wr_rx_ibs[index], &bad_recv_wr); return rc; }

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int smc_wr_create_link(struct smc_link *lnk); int smc_wr_alloc_link_mem(struct smc_link *lnk); void smc_wr_free_link(struct smc_link *lnk); void smc_wr_free_link_mem(struct smc_link *lnk); 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_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); void smc_wr_tx_cq_handler(struct ib_cq *ib_cq, void *cq_context); bool smc_wr_tx_has_pending(struct smc_link *link, u8 wr_rx_hdr_type, smc_wr_tx_filter filter, unsigned long data); void smc_wr_tx_dismiss_slots(struct smc_link *lnk, u8 wr_rx_hdr_type, smc_wr_tx_filter filter, smc_wr_tx_dismisser dismisser, unsigned long data); 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); #endif /* SMC_WR_H */

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Directory: net/smc
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