path: root/drivers/infiniband/hw/nes/nes_mgt.c

/*
 * Copyright (c) 2006 - 2011 Intel-NE, 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/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/kthread.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <net/tcp.h>
#include "nes.h"
#include "nes_mgt.h"

atomic_t pau_qps_created;
atomic_t pau_qps_destroyed;

static void nes_replenish_mgt_rq(struct nes_vnic_mgt *mgtvnic)
{
	unsigned long flags;
	dma_addr_t bus_address;
	struct sk_buff *skb;
	struct nes_hw_nic_rq_wqe *nic_rqe;
	struct nes_hw_mgt *nesmgt;
	struct nes_device *nesdev;
	struct nes_rskb_cb *cb;
	u32 rx_wqes_posted = 0;

	nesmgt = &mgtvnic->mgt;
	nesdev = mgtvnic->nesvnic->nesdev;
	spin_lock_irqsave(&nesmgt->rq_lock, flags);
	if (nesmgt->replenishing_rq != 0) {
		if (((nesmgt->rq_size - 1) == atomic_read(&mgtvnic->rx_skbs_needed)) &&
		    (atomic_read(&mgtvnic->rx_skb_timer_running) == 0)) {
			atomic_set(&mgtvnic->rx_skb_timer_running, 1);
			spin_unlock_irqrestore(&nesmgt->rq_lock, flags);
			mgtvnic->rq_wqes_timer.expires = jiffies + (HZ / 2);      /* 1/2 second */
			add_timer(&mgtvnic->rq_wqes_timer);
		} else {
			spin_unlock_irqrestore(&nesmgt->rq_lock, flags);
		}
		return;
	}
	nesmgt->replenishing_rq = 1;
	spin_unlock_irqrestore(&nesmgt->rq_lock, flags);
	do {
		skb = dev_alloc_skb(mgtvnic->nesvnic->max_frame_size);
		if (skb) {
			skb->dev = mgtvnic->nesvnic->netdev;

			bus_address = pci_map_single(nesdev->pcidev,
						     skb->data, mgtvnic->nesvnic->max_frame_size, PCI_DMA_FROMDEVICE);
			cb = (struct nes_rskb_cb *)&skb->cb[0];
			cb->busaddr = bus_address;
			cb->maplen = mgtvnic->nesvnic->max_frame_size;

			nic_rqe = &nesmgt->rq_vbase[mgtvnic->mgt.rq_head];
			nic_rqe->wqe_words[NES_NIC_RQ_WQE_LENGTH_1_0_IDX] =
				cpu_to_le32(mgtvnic->nesvnic->max_frame_size);
			nic_rqe->wqe_words[NES_NIC_RQ_WQE_LENGTH_3_2_IDX] = 0;
			nic_rqe->wqe_words[NES_NIC_RQ_WQE_FRAG0_LOW_IDX] =
				cpu_to_le32((u32)bus_address);
			nic_rqe->wqe_words[NES_NIC_RQ_WQE_FRAG0_HIGH_IDX] =
				cpu_to_le32((u32)((u64)bus_address >> 32));
			nesmgt->rx_skb[nesmgt->rq_head] = skb;
			nesmgt->rq_head++;
			nesmgt->rq_head &= nesmgt->rq_size - 1;
			atomic_dec(&mgtvnic->rx_skbs_needed);
			barrier();
			if (++rx_wqes_posted == 255</