Commit 335776bd authored by Andy Grover's avatar Andy Grover Committed by David S. Miller
Browse files

RDS: Track transports via an array, not a list 



Now that transports can be loaded in arbitrary order,
it is important for rds_trans_get_preferred() to look
for them in a particular order, instead of walking the list
until it finds a transport that works for a given address.
Now, each transport registers for a specific transport slot,
and these are ordered so that preferred transports come first,
and then if they are not loaded, other transports are queried.

Signed-off-by: default avatarAndy Grover <andy.grover@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 40d86609

net/rds/ib.c

+1 −0
Original line number Diff line number Diff line
@@ -282,6 +282,7 @@ struct rds_transport rds_ib_transport = { 
	.flush_mrs		= rds_ib_flush_mrs,

	.t_owner		= THIS_MODULE,

	.t_name			= "infiniband",

	.t_type			= RDS_TRANS_IB

};



int __init rds_ib_init(void)

net/rds/iw.c

+1 −0
Original line number Diff line number Diff line
@@ -284,6 +284,7 @@ struct rds_transport rds_iw_transport = { 
	.flush_mrs		= rds_iw_flush_mrs,

	.t_owner		= THIS_MODULE,

	.t_name			= "iwarp",

	.t_type			= RDS_TRANS_IWARP,

	.t_prefer_loopback	= 1,

};

net/rds/rds.h

+6 −0
Original line number Diff line number Diff line
@@ -311,11 +311,17 @@ struct rds_notifier { 
 * 		   flag and header.

 */



#define RDS_TRANS_IB	0

#define RDS_TRANS_IWARP	1

#define RDS_TRANS_TCP	2

#define RDS_TRANS_COUNT	3



struct rds_transport {

	char			t_name[TRANSNAMSIZ];

	struct list_head	t_item;

	struct module		*t_owner;

	unsigned int		t_prefer_loopback:1;

	unsigned int		t_type;



	int (*laddr_check)(__be32 addr);

	int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);

net/rds/tcp.c

+1 −0
Original line number Diff line number Diff line
@@ -271,6 +271,7 @@ struct rds_transport rds_tcp_transport = { 
	.exit			= rds_tcp_exit,

	.t_owner		= THIS_MODULE,

	.t_name			= "tcp",

	.t_type			= RDS_TRANS_TCP,

	.t_prefer_loopback	= 1,

};

net/rds/transport.c

+19 −10
Original line number Diff line number Diff line
@@ -37,7 +37,7 @@ 
#include "rds.h"

#include "loop.h"



static LIST_HEAD(rds_transports);

static struct rds_transport *transports[RDS_TRANS_COUNT];

static DECLARE_RWSEM(rds_trans_sem);



int rds_trans_register(struct rds_transport *trans)
@@ -46,8 +46,13 @@ int rds_trans_register(struct rds_transport *trans) 


	down_write(&rds_trans_sem);



	list_add_tail(&trans->t_item, &rds_transports);

	if (transports[trans->t_type])

		printk(KERN_ERR "RDS Transport type %d already registered\n",

			trans->t_type);

	else {

		transports[trans->t_type] = trans;

		printk(KERN_INFO "Registered RDS/%s transport\n", trans->t_name);

	}



	up_write(&rds_trans_sem);
@@ -59,7 +64,7 @@ void rds_trans_unregister(struct rds_transport *trans) 
{

	down_write(&rds_trans_sem);



	list_del_init(&trans->t_item);

	transports[trans->t_type] = NULL;

	printk(KERN_INFO "Unregistered RDS/%s transport\n", trans->t_name);



	up_write(&rds_trans_sem);
@@ -68,16 +73,17 @@ EXPORT_SYMBOL_GPL(rds_trans_unregister); 


struct rds_transport *rds_trans_get_preferred(__be32 addr)

{

	struct rds_transport *trans;

	struct rds_transport *ret = NULL;

	int i;



	if (IN_LOOPBACK(ntohl(addr)))

		return &rds_loop_transport;



	down_read(&rds_trans_sem);

	list_for_each_entry(trans, &rds_transports, t_item) {

		if (trans->laddr_check(addr) == 0) {

			ret = trans;

	for (i = 0; i < RDS_TRANS_COUNT; i++)

	{

		if (transports[i] && (transports[i]->laddr_check(addr) == 0)) {

			ret = transports[i];

			break;

		}

	}
@@ -99,12 +105,15 @@ unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 
	struct rds_transport *trans;

	unsigned int total = 0;

	unsigned int part;

	int i;



	rds_info_iter_unmap(iter);

	down_read(&rds_trans_sem);



	list_for_each_entry(trans, &rds_transports, t_item) {

		if (trans->stats_info_copy == NULL)

	for (i = 0; i < RDS_TRANS_COUNT; i++)

	{

		trans = transports[i];

		if (!trans || !trans->stats_info_copy)

			continue;



		part = trans->stats_info_copy(iter, avail);

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