[linux-block.git] / 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 <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_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);
}

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

static inline void smc_wr_wakeup_tx_wait(struct smc_link *lnk)
{
	wake_up_all(&lnk->wr_tx_wait);
}

static inline void smc_wr_wakeup_reg_wait(struct smc_link *lnk)
{
	wake_up(&lnk->wr_reg_wait);
}

/* 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 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], NULL);
	return rc;
}

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_rdma_wr **wrs,
			    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_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_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_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 */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
f38ba179 UB	2	/*
	3	* Shared Memory Communications over RDMA (SMC-R) and RoCE
	4	*
	5	* Work Requests exploiting Infiniband API
	6	*
	7	* Copyright IBM Corp. 2016
	8	*
	9	* Author(s): Steffen Maier <maier@linux.vnet.ibm.com>
	10	*/
	11
	12	#ifndef SMC_WR_H
	13	#define SMC_WR_H
	14
	15	#include <linux/atomic.h>
	16	#include <rdma/ib_verbs.h>
	17	#include <asm/div64.h>
	18
	19	#include "smc.h"
	20	#include "smc_core.h"
	21
f38ba179 UB	22	#define SMC_WR_BUF_CNT 16 /* # of ctrl buffers per link */
	23
	24	#define SMC_WR_TX_WAIT_FREE_SLOT_TIME (10 * HZ)
	25	#define SMC_WR_TX_WAIT_PENDING_TIME (5 * HZ)
	26
	27	#define SMC_WR_TX_SIZE 44 /* actual size of wr_send data (<=SMC_WR_BUF_SIZE) */
	28
	29	#define SMC_WR_TX_PEND_PRIV_SIZE 32
	30
	31	struct smc_wr_tx_pend_priv {
	32	u8 priv[SMC_WR_TX_PEND_PRIV_SIZE];
	33	};
	34
	35	typedef void (smc_wr_tx_handler)(struct smc_wr_tx_pend_priv ,
	36	struct smc_link *,
	37	enum ib_wc_status);
	38
5f08318f UB	39	typedef bool (smc_wr_tx_filter)(struct smc_wr_tx_pend_priv ,
	40	unsigned long);
	41
	42	typedef void (smc_wr_tx_dismisser)(struct smc_wr_tx_pend_priv );
	43
f38ba179 UB	44	struct smc_wr_rx_handler {
	45	struct hlist_node list; /* hash table collision resolution */
	46	void (handler)(struct ib_wc , void *);
	47	u8 type;
	48	};
	49
	50	/* Only used by RDMA write WRs.
	51	* All other WRs (CDC/LLC) use smc_wr_tx_send handling WR_ID implicitly
	52	*/
	53	static inline long smc_wr_tx_get_next_wr_id(struct smc_link *link)
	54	{
	55	return atomic_long_inc_return(&link->wr_tx_id);
	56	}
	57
	58	static inline void smc_wr_tx_set_wr_id(atomic_long_t *wr_tx_id, long val)
	59	{
	60	atomic_long_set(wr_tx_id, val);
	61	}
	62
15e1b99a UB	63	static inline void smc_wr_wakeup_tx_wait(struct smc_link *lnk)
	64	{
	65	wake_up_all(&lnk->wr_tx_wait);
	66	}
	67
	68	static inline void smc_wr_wakeup_reg_wait(struct smc_link *lnk)
	69	{
	70	wake_up(&lnk->wr_reg_wait);
	71	}
	72
f38ba179 UB	73	/* post a new receive work request to fill a completed old work request entry */
	74	static inline int smc_wr_rx_post(struct smc_link *link)
	75	{
f38ba179 UB	76	int rc;
	77	u64 wr_id, temp_wr_id;
	78	u32 index;
	79
	80	wr_id = ++link->wr_rx_id; /* tasklet context, thus not atomic */
	81	temp_wr_id = wr_id;
	82	index = do_div(temp_wr_id, link->wr_rx_cnt);
	83	link->wr_rx_ibs[index].wr_id = wr_id;
2e3bbe46	84	rc = ib_post_recv(link->roce_qp, &link->wr_rx_ibs[index], NULL);
f38ba179 UB	85	return rc;
	86	}
	87
	88	int smc_wr_create_link(struct smc_link *lnk);
	89	int smc_wr_alloc_link_mem(struct smc_link *lnk);
	90	void smc_wr_free_link(struct smc_link *lnk);
	91	void smc_wr_free_link_mem(struct smc_link *lnk);
	92	void smc_wr_remember_qp_attr(struct smc_link *lnk);
	93	void smc_wr_remove_dev(struct smc_ib_device *smcibdev);
	94	void smc_wr_add_dev(struct smc_ib_device *smcibdev);
	95
	96	int smc_wr_tx_get_free_slot(struct smc_link *link, smc_wr_tx_handler handler,
	97	struct smc_wr_buf **wr_buf,
ad6f317f	98	struct smc_rdma_wr **wrs,
f38ba179 UB	99	struct smc_wr_tx_pend_priv **wr_pend_priv);
	100	int smc_wr_tx_put_slot(struct smc_link *link,
	101	struct smc_wr_tx_pend_priv *wr_pend_priv);
	102	int smc_wr_tx_send(struct smc_link *link,
	103	struct smc_wr_tx_pend_priv *wr_pend_priv);
09c61d24 KG	104	int smc_wr_tx_send_wait(struct smc_link link, struct smc_wr_tx_pend_priv priv,
09c61d24 KG	105	unsigned long timeout);
f38ba179	106	void smc_wr_tx_cq_handler(struct ib_cq ib_cq, void cq_context);
5f08318f UB	107	void smc_wr_tx_dismiss_slots(struct smc_link *lnk, u8 wr_rx_hdr_type,
	108	smc_wr_tx_filter filter,
	109	smc_wr_tx_dismisser dismisser,
	110	unsigned long data);
c9a5d243	111	int smc_wr_tx_wait_no_pending_sends(struct smc_link *link);
f38ba179 UB	112
	113	int smc_wr_rx_register_handler(struct smc_wr_rx_handler *handler);
	114	int smc_wr_rx_post_init(struct smc_link *link);
	115	void smc_wr_rx_cq_handler(struct ib_cq ib_cq, void cq_context);
652a1e41	116	int smc_wr_reg_send(struct smc_link link, struct ib_mr mr);
f38ba179 UB	117
f38ba179 UB	118	#endif /* SMC_WR_H */