path: root/drivers/infiniband/ulp/ipoib/ipoib_cm.c

/*
 * Copyright (c) 2006 Mellanox Technologies. All rights reserved
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id$
 */

#include <rdma/ib_cm.h>
#include <rdma/ib_cache.h>
#include <net/dst.h>
#include <net/icmp.h>
#include <linux/icmpv6.h>

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
static int data_debug_level;

module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
MODULE_PARM_DESC(cm_data_debug_level,
		 "Enable data path debug tracing for connected mode if > 0");
#endif

#include "ipoib.h"

#define IPOIB_CM_IETF_ID 0x1000000000000000ULL

#define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
#define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
#define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
#define IPOIB_CM_RX_UPDATE_MASK (0x3)

struct ipoib_cm_id {
	struct ib_cm_id *id;
	int flags;
	u32 remote_qpn;
	u32 remote_mtu;
};

static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
			       struct ib_cm_event *event);

static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
				  u64 mapping[IPOIB_CM_RX_SG])
{
	int i;

	ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);

	for (i = 0; i < frags; ++i)
		ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
}

static int ipoib_cm_post_receive(struct net_device *dev, int id)
{
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	struct ib_recv_wr *bad_wr;
	int i, ret;

	priv->cm.rx_wr.wr_id = id | IPOIB_CM_OP_SRQ;

	for (i = 0; i < IPOIB_CM_RX_SG; ++i)
		priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];

	ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
	if (unlikely(ret)) {
		ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
		ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
				      priv->cm.srq_ring[id].mapping);
		dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
		priv->cm.srq_ring[id].skb = NULL;
	}

	return ret;