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Release 4.11 net/smc/smc_cdc.h

Directory: net/smc
/*
 * Shared Memory Communications over RDMA (SMC-R) and RoCE
 *
 * Connection Data Control (CDC)
 *
 * Copyright IBM Corp. 2016
 *
 * Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
 */

#ifndef SMC_CDC_H

#define SMC_CDC_H

#include <linux/kernel.h> /* max_t */
#include <linux/atomic.h>
#include <linux/in.h>
#include <linux/compiler.h>

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


#define	SMC_CDC_MSG_TYPE		0xFE

/* in network byte order */

union smc_cdc_cursor {		/* SMC cursor */
	struct {
		
__be16	reserved;
		
__be16	wrap;
		
__be32	count;
	};
#ifdef KERNEL_HAS_ATOMIC64
	
atomic64_t	acurs;		/* for atomic processing */
#else
	
u64		acurs;		/* for atomic processing */
#endif
} __aligned(8);

/* in network byte order */

struct smc_cdc_msg {
	
struct smc_wr_rx_hdr		common; /* .type = 0xFE */
	
u8				len;	/* 44 */
	
__be16				seqno;
	
__be32				token;
	
union smc_cdc_cursor		prod;
	
union smc_cdc_cursor		cons;	/* piggy backed "ack" */
	
struct smc_cdc_producer_flags	prod_flags;
	
struct smc_cdc_conn_state_flags	conn_state_flags;
	
u8				reserved[18];
} __aligned(8);


static inline bool smc_cdc_rxed_any_close(struct smc_connection *conn) { return conn->local_rx_ctrl.conn_state_flags.peer_conn_abort || conn->local_rx_ctrl.conn_state_flags.peer_conn_closed; }

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static inline bool smc_cdc_rxed_any_close_or_senddone( struct smc_connection *conn) { return smc_cdc_rxed_any_close(conn) || conn->local_rx_ctrl.conn_state_flags.peer_done_writing; }

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static inline void smc_curs_add(int size, union smc_host_cursor *curs, int value) { curs->count += value; if (curs->count >= size) { curs->wrap++; curs->count -= size; } }

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/* SMC cursors are 8 bytes long and require atomic reading and writing */
static inline u64 smc_curs_read(union smc_host_cursor *curs, struct smc_connection *conn) { #ifndef KERNEL_HAS_ATOMIC64 unsigned long flags; u64 ret; spin_lock_irqsave(&conn->acurs_lock, flags); ret = curs->acurs; spin_unlock_irqrestore(&conn->acurs_lock, flags); return ret; #else return atomic64_read(&curs->acurs); #endif }

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static inline u64 smc_curs_read_net(union smc_cdc_cursor *curs, struct smc_connection *conn) { #ifndef KERNEL_HAS_ATOMIC64 unsigned long flags; u64 ret; spin_lock_irqsave(&conn->acurs_lock, flags); ret = curs->acurs; spin_unlock_irqrestore(&conn->acurs_lock, flags); return ret; #else return atomic64_read(&curs->acurs); #endif }

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static inline void smc_curs_write(union smc_host_cursor *curs, u64 val, struct smc_connection *conn) { #ifndef KERNEL_HAS_ATOMIC64 unsigned long flags; spin_lock_irqsave(&conn->acurs_lock, flags); curs->acurs = val; spin_unlock_irqrestore(&conn->acurs_lock, flags); #else atomic64_set(&curs->acurs, val); #endif }

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static inline void smc_curs_write_net(union smc_cdc_cursor *curs, u64 val, struct smc_connection *conn) { #ifndef KERNEL_HAS_ATOMIC64 unsigned long flags; spin_lock_irqsave(&conn->acurs_lock, flags); curs->acurs = val; spin_unlock_irqrestore(&conn->acurs_lock, flags); #else atomic64_set(&curs->acurs, val); #endif }

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/* calculate cursor difference between old and new, where old <= new */
static inline int smc_curs_diff(unsigned int size, union smc_host_cursor *old, union smc_host_cursor *new) { if (old->wrap != new->wrap) return max_t(int, 0, ((size - old->count) + new->count)); return max_t(int, 0, (new->count - old->count)); }

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static inline void smc_host_cursor_to_cdc(union smc_cdc_cursor *peer, union smc_host_cursor *local, struct smc_connection *conn) { union smc_host_cursor temp; smc_curs_write(&temp, smc_curs_read(local, conn), conn); peer->count = htonl(temp.count); peer->wrap = htons(temp.wrap); /* peer->reserved = htons(0); must be ensured by caller */ }

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static inline void smc_host_msg_to_cdc(struct smc_cdc_msg *peer, struct smc_host_cdc_msg *local, struct smc_connection *conn) { peer->common.type = local->common.type; peer->len = local->len; peer->seqno = htons(local->seqno); peer->token = htonl(local->token); smc_host_cursor_to_cdc(&peer->prod, &local->prod, conn); smc_host_cursor_to_cdc(&peer->cons, &local->cons, conn); peer->prod_flags = local->prod_flags; peer->conn_state_flags = local->conn_state_flags; }

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static inline void smc_cdc_cursor_to_host(union smc_host_cursor *local, union smc_cdc_cursor *peer, struct smc_connection *conn) { union smc_host_cursor temp, old; union smc_cdc_cursor net; smc_curs_write(&old, smc_curs_read(local, conn), conn); smc_curs_write_net(&net, smc_curs_read_net(peer, conn), conn); temp.count = ntohl(net.count); temp.wrap = ntohs(net.wrap); if ((old.wrap > temp.wrap) && temp.wrap) return; if ((old.wrap == temp.wrap) && (old.count > temp.count)) return; smc_curs_write(local, smc_curs_read(&temp, conn), conn); }

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static inline void smc_cdc_msg_to_host(struct smc_host_cdc_msg *local, struct smc_cdc_msg *peer, struct smc_connection *conn) { local->common.type = peer->common.type; local->len = peer->len; local->seqno = ntohs(peer->seqno); local->token = ntohl(peer->token); smc_cdc_cursor_to_host(&local->prod, &peer->prod, conn); smc_cdc_cursor_to_host(&local->cons, &peer->cons, conn); local->prod_flags = peer->prod_flags; local->conn_state_flags = peer->conn_state_flags; }

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struct smc_cdc_tx_pend; int smc_cdc_get_free_slot(struct smc_link *link, struct smc_wr_buf **wr_buf, struct smc_cdc_tx_pend **pend); void smc_cdc_tx_dismiss_slots(struct smc_connection *conn); int smc_cdc_msg_send(struct smc_connection *conn, struct smc_wr_buf *wr_buf, struct smc_cdc_tx_pend *pend); int smc_cdc_get_slot_and_msg_send(struct smc_connection *conn); bool smc_cdc_tx_has_pending(struct smc_connection *conn); int smc_cdc_init(void) __init; #endif /* SMC_CDC_H */

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Directory: net/smc
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