#include <linux/ceph/ceph_debug.h>

#include <linux/err.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/vmalloc.h>

#include <linux/ceph/messenger.h>
#include <linux/ceph/msgpool.h>

static void *msgpool_alloc(gfp_t gfp_mask, void *arg)
{
	struct ceph_msgpool *pool = arg;
	struct ceph_msg *msg;

	msg = ceph_msg_new(pool->type, pool->front_len, gfp_mask, true);
	if (!msg) {
		dout("msgpool_alloc %s failed\n", pool->name);
	} else {
		dout("msgpool_alloc %s %p\n", pool->name, msg);
		msg->pool = pool;
	}
	return msg;
}

static void msgpool_free(void *element, void *arg)
{
	struct ceph_msgpool *pool = arg;
	struct ceph_msg *msg = element;

	dout("msgpool_release %s %p\n", pool->name, msg);
	msg->pool = NULL;
	ceph_msg_put(msg);
}

int ceph_msgpool_init(struct ceph_msgpool *pool, int type,
		      int front_len, int size, bool blocking, const char *name)
{
	dout("msgpool %s init\n", name);
	pool->type = type;
	pool->front_len = front_len;
	pool->pool = mempool_create(size, msgpool_alloc, msgpool_free, pool);
	if (!pool->pool)
		return -ENOMEM;
	pool->name = name;
	return 0;
}

void ceph_msgpool_destroy(struct ceph_msgpool *pool)
{
	dout("msgpool %s destroy\n", pool->name);
	mempool_destroy(pool->pool);
}

struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool,
				  int front_len)
{
	struct ceph_msg *msg;

	if (front_len > pool->front_len) {
		dout("msgpool_get %s need front %d, pool size is %d\n",
		       pool->name, front_len, pool->front_len);
		WARN_ON(1);

		/* try to alloc a fresh message */
		return ceph_msg_new(pool->type, front_len, GFP_NOFS, false);
	}

	msg = mempool_alloc(pool->pool, GFP_NOFS);
	dout("msgpool_get %s %p\n", pool->name, msg);
	return msg;
}

void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg)
{
	dout("msgpool_put %s %p\n", pool->name, msg);

	/* reset msg front_len; user may have changed it */
	msg->front.iov_len = pool->front_len;
	msg->hdr.front_len = cpu_to_le32(pool->front_len);

	kref_init(&msg->kref);  /* retake single ref */
	mempool_free(msg, pool->pool);
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=89d82452d1fd283bb1e313bc7a1f7c324362cf02&amp;showmsg=1'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?id=89d82452d1fd283bb1e313bc7a1f7c324362cf02&amp;showmsg=1'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/dsa?id=89d82452d1fd283bb1e313bc7a1f7c324362cf02&amp;showmsg=1'>dsa</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/dsa/Makefile?id=89d82452d1fd283bb1e313bc7a1f7c324362cf02&amp;showmsg=1'>Makefile</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/dsa/Makefile?id=89d82452d1fd283bb1e313bc7a1f7c324362cf02'>Collapse</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr class='logheader'><td><span title='2017-02-06 16:53:29 -0500'>2017-02-06</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/net/dsa/Makefile?id=f515f192ab4f45bb695146b82432d63d98775787'>net: dsa: add switch notifier</a></td><td>Vivien Didelot</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+1</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
Add a notifier block per DSA switch, registered against a notifier head
in the switch fabric they belong to.

This infrastructure will allow to propagate fabric-wide events such as
port bridging, VLAN configuration, etc. If a DSA switch driver cares
about cross-chip configuration, such events can be caught.

Signed-off-by: Vivien Didelot &lt;vivien.didelot@savoirfairelinux.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;


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