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

/*
 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2004, 2005 Voltaire, Inc. 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.
 */

#include <linux/delay.h>
#include <linux/dma-mapping.h>

#include <rdma/ib_cache.h>
#include <linux/ip.h>
#include <linux/tcp.h>

#include "ipoib.h"

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
static int data_debug_level;

module_param(data_debug_level, int, 0644);
MODULE_PARM_DESC(data_debug_level,
		 "Enable data path debug tracing if > 0");
#endif

static DEFINE_MUTEX(pkey_mutex);

struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
				 struct ib_pd *pd, struct ib_ah_attr *attr)
{
	struct ipoib_ah *ah;

	ah = kmalloc(sizeof *ah, GFP_KERNEL);
	if (!ah)
		return NULL;

	ah->dev       = dev;
	ah->last_send = 0;
	kref_init(&ah->ref);

	ah->ah = ib_create_ah(pd, attr);
	if (IS_ERR(ah->ah)) {
		kfree(ah);
		ah = NULL;
	} else
		ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);

	return ah;
}

void ipoib_free_ah(struct kref *kref)
{
	struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
	struct ipoib_dev_priv *priv = netdev_priv(ah->dev);

	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	list_add_tail(&ah->list, &priv->dead_ahs);
	spin_unlock_irqrestore(&priv->lock, flags);
}

static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
				  u64 mapping[IPOIB_UD_RX_SG])
{
	if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
		ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE,
				    DMA_FROM_DEVICE);
		ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE,
				  DMA_FROM_DEVICE);
	} else
		ib_dma_unmap_single(priv->ca, mapping[0],
				    IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
				    DMA_FROM_DEVICE);
}

static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv,
				   struct sk_buff *skb,
				   unsigned int length)
{
	if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
		skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
		unsigned int size;
		/*
		 * There is only two buffers needed for max_payload = 4K,
		 * first buf size is IPOIB_UD_HEAD_SIZE
		 */
		skb->tail += IPOIB_UD_HEAD_SIZE;
		skb->len  += length;

		size = length - IPOIB_UD_HEAD_SIZE;

		frag->size     = size;
		skb->data_len += size;
		skb->truesize += size;
	} else
		skb_put(skb, length);

}

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

	priv->rx_wr.wr_id   = id | IPOIB_OP_RECV;
	priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
	priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];


	ret = ib_post_recv(priv->