1495 lines
38 KiB
C
1495 lines
38 KiB
C
/*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2012 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* BSD LICENSE
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*
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* Copyright(c) 2012 Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copy
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Intel PCIe NTB Linux driver
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*
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* Contact Information:
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* Jon Mason <jon.mason@intel.com>
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*/
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#include <linux/debugfs.h>
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#include <linux/delay.h>
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#include <linux/dma-mapping.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/ntb.h>
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#include "ntb_hw.h"
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#define NTB_TRANSPORT_VERSION 3
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static unsigned int transport_mtu = 0x401E;
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module_param(transport_mtu, uint, 0644);
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MODULE_PARM_DESC(transport_mtu, "Maximum size of NTB transport packets");
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static unsigned char max_num_clients = 2;
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module_param(max_num_clients, byte, 0644);
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MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients");
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struct ntb_queue_entry {
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/* ntb_queue list reference */
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struct list_head entry;
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/* pointers to data to be transfered */
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void *cb_data;
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void *buf;
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unsigned int len;
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unsigned int flags;
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};
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struct ntb_rx_info {
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unsigned int entry;
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};
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struct ntb_transport_qp {
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struct ntb_transport *transport;
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struct ntb_device *ndev;
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void *cb_data;
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bool client_ready;
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bool qp_link;
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u8 qp_num; /* Only 64 QP's are allowed. 0-63 */
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struct ntb_rx_info __iomem *rx_info;
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struct ntb_rx_info *remote_rx_info;
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void (*tx_handler) (struct ntb_transport_qp *qp, void *qp_data,
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void *data, int len);
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struct list_head tx_free_q;
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spinlock_t ntb_tx_free_q_lock;
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void __iomem *tx_mw;
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unsigned int tx_index;
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unsigned int tx_max_entry;
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unsigned int tx_max_frame;
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void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data,
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void *data, int len);
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struct tasklet_struct rx_work;
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struct list_head rx_pend_q;
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struct list_head rx_free_q;
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spinlock_t ntb_rx_pend_q_lock;
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spinlock_t ntb_rx_free_q_lock;
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void *rx_buff;
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unsigned int rx_index;
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unsigned int rx_max_entry;
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unsigned int rx_max_frame;
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void (*event_handler) (void *data, int status);
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struct delayed_work link_work;
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struct work_struct link_cleanup;
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struct dentry *debugfs_dir;
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struct dentry *debugfs_stats;
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/* Stats */
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u64 rx_bytes;
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u64 rx_pkts;
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u64 rx_ring_empty;
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u64 rx_err_no_buf;
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u64 rx_err_oflow;
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u64 rx_err_ver;
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u64 tx_bytes;
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u64 tx_pkts;
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u64 tx_ring_full;
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};
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struct ntb_transport_mw {
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size_t size;
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void *virt_addr;
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dma_addr_t dma_addr;
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};
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struct ntb_transport_client_dev {
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struct list_head entry;
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struct device dev;
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};
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struct ntb_transport {
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struct list_head entry;
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struct list_head client_devs;
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struct ntb_device *ndev;
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struct ntb_transport_mw mw[NTB_NUM_MW];
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struct ntb_transport_qp *qps;
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unsigned int max_qps;
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unsigned long qp_bitmap;
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bool transport_link;
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struct delayed_work link_work;
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struct work_struct link_cleanup;
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struct dentry *debugfs_dir;
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};
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enum {
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DESC_DONE_FLAG = 1 << 0,
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LINK_DOWN_FLAG = 1 << 1,
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};
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struct ntb_payload_header {
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unsigned int ver;
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unsigned int len;
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unsigned int flags;
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};
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enum {
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VERSION = 0,
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QP_LINKS,
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NUM_QPS,
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NUM_MWS,
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MW0_SZ_HIGH,
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MW0_SZ_LOW,
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MW1_SZ_HIGH,
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MW1_SZ_LOW,
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MAX_SPAD,
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};
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#define QP_TO_MW(qp) ((qp) % NTB_NUM_MW)
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#define NTB_QP_DEF_NUM_ENTRIES 100
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#define NTB_LINK_DOWN_TIMEOUT 10
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static int ntb_match_bus(struct device *dev, struct device_driver *drv)
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{
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return !strncmp(dev_name(dev), drv->name, strlen(drv->name));
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}
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static int ntb_client_probe(struct device *dev)
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{
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const struct ntb_client *drv = container_of(dev->driver,
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struct ntb_client, driver);
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struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev);
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int rc = -EINVAL;
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get_device(dev);
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if (drv && drv->probe)
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rc = drv->probe(pdev);
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if (rc)
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put_device(dev);
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return rc;
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}
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static int ntb_client_remove(struct device *dev)
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{
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const struct ntb_client *drv = container_of(dev->driver,
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struct ntb_client, driver);
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struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev);
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if (drv && drv->remove)
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drv->remove(pdev);
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put_device(dev);
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return 0;
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}
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static struct bus_type ntb_bus_type = {
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.name = "ntb_bus",
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.match = ntb_match_bus,
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.probe = ntb_client_probe,
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.remove = ntb_client_remove,
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};
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static LIST_HEAD(ntb_transport_list);
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static int ntb_bus_init(struct ntb_transport *nt)
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{
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if (list_empty(&ntb_transport_list)) {
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int rc = bus_register(&ntb_bus_type);
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if (rc)
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return rc;
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}
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list_add(&nt->entry, &ntb_transport_list);
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return 0;
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}
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static void ntb_bus_remove(struct ntb_transport *nt)
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{
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struct ntb_transport_client_dev *client_dev, *cd;
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list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) {
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dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n",
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dev_name(&client_dev->dev));
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list_del(&client_dev->entry);
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device_unregister(&client_dev->dev);
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}
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list_del(&nt->entry);
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if (list_empty(&ntb_transport_list))
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bus_unregister(&ntb_bus_type);
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}
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static void ntb_client_release(struct device *dev)
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{
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struct ntb_transport_client_dev *client_dev;
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client_dev = container_of(dev, struct ntb_transport_client_dev, dev);
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kfree(client_dev);
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}
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/**
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* ntb_unregister_client_dev - Unregister NTB client device
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* @device_name: Name of NTB client device
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*
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* Unregister an NTB client device with the NTB transport layer
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*/
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void ntb_unregister_client_dev(char *device_name)
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{
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struct ntb_transport_client_dev *client, *cd;
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struct ntb_transport *nt;
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list_for_each_entry(nt, &ntb_transport_list, entry)
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list_for_each_entry_safe(client, cd, &nt->client_devs, entry)
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if (!strncmp(dev_name(&client->dev), device_name,
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strlen(device_name))) {
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list_del(&client->entry);
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device_unregister(&client->dev);
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}
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}
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EXPORT_SYMBOL_GPL(ntb_unregister_client_dev);
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/**
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* ntb_register_client_dev - Register NTB client device
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* @device_name: Name of NTB client device
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*
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* Register an NTB client device with the NTB transport layer
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*/
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int ntb_register_client_dev(char *device_name)
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{
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struct ntb_transport_client_dev *client_dev;
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struct ntb_transport *nt;
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int rc, i = 0;
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if (list_empty(&ntb_transport_list))
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return -ENODEV;
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list_for_each_entry(nt, &ntb_transport_list, entry) {
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struct device *dev;
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client_dev = kzalloc(sizeof(struct ntb_transport_client_dev),
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GFP_KERNEL);
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if (!client_dev) {
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rc = -ENOMEM;
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goto err;
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}
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dev = &client_dev->dev;
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/* setup and register client devices */
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dev_set_name(dev, "%s%d", device_name, i);
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dev->bus = &ntb_bus_type;
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dev->release = ntb_client_release;
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dev->parent = &ntb_query_pdev(nt->ndev)->dev;
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rc = device_register(dev);
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if (rc) {
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kfree(client_dev);
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goto err;
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}
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list_add_tail(&client_dev->entry, &nt->client_devs);
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i++;
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}
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return 0;
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err:
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ntb_unregister_client_dev(device_name);
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return rc;
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}
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EXPORT_SYMBOL_GPL(ntb_register_client_dev);
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/**
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* ntb_register_client - Register NTB client driver
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* @drv: NTB client driver to be registered
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*
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* Register an NTB client driver with the NTB transport layer
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*
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* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
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*/
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int ntb_register_client(struct ntb_client *drv)
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{
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drv->driver.bus = &ntb_bus_type;
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if (list_empty(&ntb_transport_list))
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return -ENODEV;
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return driver_register(&drv->driver);
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}
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EXPORT_SYMBOL_GPL(ntb_register_client);
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/**
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* ntb_unregister_client - Unregister NTB client driver
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* @drv: NTB client driver to be unregistered
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*
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* Unregister an NTB client driver with the NTB transport layer
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*
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* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
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*/
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void ntb_unregister_client(struct ntb_client *drv)
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{
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driver_unregister(&drv->driver);
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}
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EXPORT_SYMBOL_GPL(ntb_unregister_client);
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static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
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loff_t *offp)
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{
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struct ntb_transport_qp *qp;
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char *buf;
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ssize_t ret, out_offset, out_count;
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out_count = 600;
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buf = kmalloc(out_count, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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qp = filp->private_data;
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out_offset = 0;
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"NTB QP stats\n");
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"rx_bytes - \t%llu\n", qp->rx_bytes);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"rx_pkts - \t%llu\n", qp->rx_pkts);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"rx_ring_empty - %llu\n", qp->rx_ring_empty);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"rx_err_no_buf - %llu\n", qp->rx_err_no_buf);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"rx_err_oflow - \t%llu\n", qp->rx_err_oflow);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"rx_err_ver - \t%llu\n", qp->rx_err_ver);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"rx_buff - \t%p\n", qp->rx_buff);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"rx_index - \t%u\n", qp->rx_index);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"rx_max_entry - \t%u\n", qp->rx_max_entry);
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|
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"tx_bytes - \t%llu\n", qp->tx_bytes);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"tx_pkts - \t%llu\n", qp->tx_pkts);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"tx_ring_full - \t%llu\n", qp->tx_ring_full);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"tx_mw - \t%p\n", qp->tx_mw);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"tx_index - \t%u\n", qp->tx_index);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"tx_max_entry - \t%u\n", qp->tx_max_entry);
|
|
|
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"\nQP Link %s\n", (qp->qp_link == NTB_LINK_UP) ?
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"Up" : "Down");
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if (out_offset > out_count)
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out_offset = out_count;
|
|
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ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
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kfree(buf);
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return ret;
|
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}
|
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|
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static const struct file_operations ntb_qp_debugfs_stats = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = debugfs_read,
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};
|
|
|
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static void ntb_list_add(spinlock_t *lock, struct list_head *entry,
|
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struct list_head *list)
|
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{
|
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unsigned long flags;
|
|
|
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spin_lock_irqsave(lock, flags);
|
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list_add_tail(entry, list);
|
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spin_unlock_irqrestore(lock, flags);
|
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}
|
|
|
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static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock,
|
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struct list_head *list)
|
|
{
|
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struct ntb_queue_entry *entry;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(lock, flags);
|
|
if (list_empty(list)) {
|
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entry = NULL;
|
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goto out;
|
|
}
|
|
entry = list_first_entry(list, struct ntb_queue_entry, entry);
|
|
list_del(&entry->entry);
|
|
out:
|
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spin_unlock_irqrestore(lock, flags);
|
|
|
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return entry;
|
|
}
|
|
|
|
static void ntb_transport_setup_qp_mw(struct ntb_transport *nt,
|
|
unsigned int qp_num)
|
|
{
|
|
struct ntb_transport_qp *qp = &nt->qps[qp_num];
|
|
unsigned int rx_size, num_qps_mw;
|
|
u8 mw_num = QP_TO_MW(qp_num);
|
|
unsigned int i;
|
|
|
|
WARN_ON(nt->mw[mw_num].virt_addr == NULL);
|
|
|
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if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW)
|
|
num_qps_mw = nt->max_qps / NTB_NUM_MW + 1;
|
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else
|
|
num_qps_mw = nt->max_qps / NTB_NUM_MW;
|
|
|
|
rx_size = (unsigned int) nt->mw[mw_num].size / num_qps_mw;
|
|
qp->remote_rx_info = nt->mw[mw_num].virt_addr +
|
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(qp_num / NTB_NUM_MW * rx_size);
|
|
rx_size -= sizeof(struct ntb_rx_info);
|
|
|
|
qp->rx_buff = qp->remote_rx_info + 1;
|
|
/* Due to housekeeping, there must be atleast 2 buffs */
|
|
qp->rx_max_frame = min(transport_mtu, rx_size / 2);
|
|
qp->rx_max_entry = rx_size / qp->rx_max_frame;
|
|
qp->rx_index = 0;
|
|
|
|
qp->remote_rx_info->entry = qp->rx_max_entry - 1;
|
|
|
|
/* setup the hdr offsets with 0's */
|
|
for (i = 0; i < qp->rx_max_entry; i++) {
|
|
void *offset = qp->rx_buff + qp->rx_max_frame * (i + 1) -
|
|
sizeof(struct ntb_payload_header);
|
|
memset(offset, 0, sizeof(struct ntb_payload_header));
|
|
}
|
|
|
|
qp->rx_pkts = 0;
|
|
qp->tx_pkts = 0;
|
|
qp->tx_index = 0;
|
|
}
|
|
|
|
static void ntb_free_mw(struct ntb_transport *nt, int num_mw)
|
|
{
|
|
struct ntb_transport_mw *mw = &nt->mw[num_mw];
|
|
struct pci_dev *pdev = ntb_query_pdev(nt->ndev);
|
|
|
|
if (!mw->virt_addr)
|
|
return;
|
|
|
|
dma_free_coherent(&pdev->dev, mw->size, mw->virt_addr, mw->dma_addr);
|
|
mw->virt_addr = NULL;
|
|
}
|
|
|
|
static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size)
|
|
{
|
|
struct ntb_transport_mw *mw = &nt->mw[num_mw];
|
|
struct pci_dev *pdev = ntb_query_pdev(nt->ndev);
|
|
|
|
/* No need to re-setup */
|
|
if (mw->size == ALIGN(size, 4096))
|
|
return 0;
|
|
|
|
if (mw->size != 0)
|
|
ntb_free_mw(nt, num_mw);
|
|
|
|
/* Alloc memory for receiving data. Must be 4k aligned */
|
|
mw->size = ALIGN(size, 4096);
|
|
|
|
mw->virt_addr = dma_alloc_coherent(&pdev->dev, mw->size, &mw->dma_addr,
|
|
GFP_KERNEL);
|
|
if (!mw->virt_addr) {
|
|
mw->size = 0;
|
|
dev_err(&pdev->dev, "Unable to allocate MW buffer of size %d\n",
|
|
(int) mw->size);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Notify HW the memory location of the receive buffer */
|
|
ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ntb_qp_link_cleanup(struct work_struct *work)
|
|
{
|
|
struct ntb_transport_qp *qp = container_of(work,
|
|
struct ntb_transport_qp,
|
|
link_cleanup);
|
|
struct ntb_transport *nt = qp->transport;
|
|
struct pci_dev *pdev = ntb_query_pdev(nt->ndev);
|
|
|
|
if (qp->qp_link == NTB_LINK_DOWN) {
|
|
cancel_delayed_work_sync(&qp->link_work);
|
|
return;
|
|
}
|
|
|
|
if (qp->event_handler)
|
|
qp->event_handler(qp->cb_data, NTB_LINK_DOWN);
|
|
|
|
dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num);
|
|
qp->qp_link = NTB_LINK_DOWN;
|
|
|
|
if (nt->transport_link == NTB_LINK_UP)
|
|
schedule_delayed_work(&qp->link_work,
|
|
msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT));
|
|
}
|
|
|
|
static void ntb_qp_link_down(struct ntb_transport_qp *qp)
|
|
{
|
|
schedule_work(&qp->link_cleanup);
|
|
}
|
|
|
|
static void ntb_transport_link_cleanup(struct work_struct *work)
|
|
{
|
|
struct ntb_transport *nt = container_of(work, struct ntb_transport,
|
|
link_cleanup);
|
|
int i;
|
|
|
|
if (nt->transport_link == NTB_LINK_DOWN)
|
|
cancel_delayed_work_sync(&nt->link_work);
|
|
else
|
|
nt->transport_link = NTB_LINK_DOWN;
|
|
|
|
/* Pass along the info to any clients */
|
|
for (i = 0; i < nt->max_qps; i++)
|
|
if (!test_bit(i, &nt->qp_bitmap))
|
|
ntb_qp_link_down(&nt->qps[i]);
|
|
|
|
/* The scratchpad registers keep the values if the remote side
|
|
* goes down, blast them now to give them a sane value the next
|
|
* time they are accessed
|
|
*/
|
|
for (i = 0; i < MAX_SPAD; i++)
|
|
ntb_write_local_spad(nt->ndev, i, 0);
|
|
}
|
|
|
|
static void ntb_transport_event_callback(void *data, enum ntb_hw_event event)
|
|
{
|
|
struct ntb_transport *nt = data;
|
|
|
|
switch (event) {
|
|
case NTB_EVENT_HW_LINK_UP:
|
|
schedule_delayed_work(&nt->link_work, 0);
|
|
break;
|
|
case NTB_EVENT_HW_LINK_DOWN:
|
|
schedule_work(&nt->link_cleanup);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
static void ntb_transport_link_work(struct work_struct *work)
|
|
{
|
|
struct ntb_transport *nt = container_of(work, struct ntb_transport,
|
|
link_work.work);
|
|
struct ntb_device *ndev = nt->ndev;
|
|
struct pci_dev *pdev = ntb_query_pdev(ndev);
|
|
u32 val;
|
|
int rc, i;
|
|
|
|
/* send the local info, in the opposite order of the way we read it */
|
|
for (i = 0; i < NTB_NUM_MW; i++) {
|
|
rc = ntb_write_remote_spad(ndev, MW0_SZ_HIGH + (i * 2),
|
|
ntb_get_mw_size(ndev, i) >> 32);
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Error writing %u to remote spad %d\n",
|
|
(u32)(ntb_get_mw_size(ndev, i) >> 32),
|
|
MW0_SZ_HIGH + (i * 2));
|
|
goto out;
|
|
}
|
|
|
|
rc = ntb_write_remote_spad(ndev, MW0_SZ_LOW + (i * 2),
|
|
(u32) ntb_get_mw_size(ndev, i));
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Error writing %u to remote spad %d\n",
|
|
(u32) ntb_get_mw_size(ndev, i),
|
|
MW0_SZ_LOW + (i * 2));
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
rc = ntb_write_remote_spad(ndev, NUM_MWS, NTB_NUM_MW);
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Error writing %x to remote spad %d\n",
|
|
NTB_NUM_MW, NUM_MWS);
|
|
goto out;
|
|
}
|
|
|
|
rc = ntb_write_remote_spad(ndev, NUM_QPS, nt->max_qps);
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Error writing %x to remote spad %d\n",
|
|
nt->max_qps, NUM_QPS);
|
|
goto out;
|
|
}
|
|
|
|
rc = ntb_write_remote_spad(ndev, VERSION, NTB_TRANSPORT_VERSION);
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Error writing %x to remote spad %d\n",
|
|
NTB_TRANSPORT_VERSION, VERSION);
|
|
goto out;
|
|
}
|
|
|
|
/* Query the remote side for its info */
|
|
rc = ntb_read_remote_spad(ndev, VERSION, &val);
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Error reading remote spad %d\n", VERSION);
|
|
goto out;
|
|
}
|
|
|
|
if (val != NTB_TRANSPORT_VERSION)
|
|
goto out;
|
|
dev_dbg(&pdev->dev, "Remote version = %d\n", val);
|
|
|
|
rc = ntb_read_remote_spad(ndev, NUM_QPS, &val);
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_QPS);
|
|
goto out;
|
|
}
|
|
|
|
if (val != nt->max_qps)
|
|
goto out;
|
|
dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val);
|
|
|
|
rc = ntb_read_remote_spad(ndev, NUM_MWS, &val);
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Error reading remote spad %d\n", NUM_MWS);
|
|
goto out;
|
|
}
|
|
|
|
if (val != NTB_NUM_MW)
|
|
goto out;
|
|
dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val);
|
|
|
|
for (i = 0; i < NTB_NUM_MW; i++) {
|
|
u64 val64;
|
|
|
|
rc = ntb_read_remote_spad(ndev, MW0_SZ_HIGH + (i * 2), &val);
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Error reading remote spad %d\n",
|
|
MW0_SZ_HIGH + (i * 2));
|
|
goto out1;
|
|
}
|
|
|
|
val64 = (u64) val << 32;
|
|
|
|
rc = ntb_read_remote_spad(ndev, MW0_SZ_LOW + (i * 2), &val);
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Error reading remote spad %d\n",
|
|
MW0_SZ_LOW + (i * 2));
|
|
goto out1;
|
|
}
|
|
|
|
val64 |= val;
|
|
|
|
dev_dbg(&pdev->dev, "Remote MW%d size = %llu\n", i, val64);
|
|
|
|
rc = ntb_set_mw(nt, i, val64);
|
|
if (rc)
|
|
goto out1;
|
|
}
|
|
|
|
nt->transport_link = NTB_LINK_UP;
|
|
|
|
for (i = 0; i < nt->max_qps; i++) {
|
|
struct ntb_transport_qp *qp = &nt->qps[i];
|
|
|
|
ntb_transport_setup_qp_mw(nt, i);
|
|
|
|
if (qp->client_ready == NTB_LINK_UP)
|
|
schedule_delayed_work(&qp->link_work, 0);
|
|
}
|
|
|
|
return;
|
|
|
|
out1:
|
|
for (i = 0; i < NTB_NUM_MW; i++)
|
|
ntb_free_mw(nt, i);
|
|
out:
|
|
if (ntb_hw_link_status(ndev))
|
|
schedule_delayed_work(&nt->link_work,
|
|
msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT));
|
|
}
|
|
|
|
static void ntb_qp_link_work(struct work_struct *work)
|
|
{
|
|
struct ntb_transport_qp *qp = container_of(work,
|
|
struct ntb_transport_qp,
|
|
link_work.work);
|
|
struct pci_dev *pdev = ntb_query_pdev(qp->ndev);
|
|
struct ntb_transport *nt = qp->transport;
|
|
int rc, val;
|
|
|
|
WARN_ON(nt->transport_link != NTB_LINK_UP);
|
|
|
|
rc = ntb_read_local_spad(nt->ndev, QP_LINKS, &val);
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS);
|
|
return;
|
|
}
|
|
|
|
rc = ntb_write_remote_spad(nt->ndev, QP_LINKS, val | 1 << qp->qp_num);
|
|
if (rc)
|
|
dev_err(&pdev->dev, "Error writing %x to remote spad %d\n",
|
|
val | 1 << qp->qp_num, QP_LINKS);
|
|
|
|
/* query remote spad for qp ready bits */
|
|
rc = ntb_read_remote_spad(nt->ndev, QP_LINKS, &val);
|
|
if (rc)
|
|
dev_err(&pdev->dev, "Error reading remote spad %d\n", QP_LINKS);
|
|
|
|
dev_dbg(&pdev->dev, "Remote QP link status = %x\n", val);
|
|
|
|
/* See if the remote side is up */
|
|
if (1 << qp->qp_num & val) {
|
|
qp->qp_link = NTB_LINK_UP;
|
|
|
|
dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num);
|
|
if (qp->event_handler)
|
|
qp->event_handler(qp->cb_data, NTB_LINK_UP);
|
|
} else if (nt->transport_link == NTB_LINK_UP)
|
|
schedule_delayed_work(&qp->link_work,
|
|
msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT));
|
|
}
|
|
|
|
static void ntb_transport_init_queue(struct ntb_transport *nt,
|
|
unsigned int qp_num)
|
|
{
|
|
struct ntb_transport_qp *qp;
|
|
unsigned int num_qps_mw, tx_size;
|
|
u8 mw_num = QP_TO_MW(qp_num);
|
|
|
|
qp = &nt->qps[qp_num];
|
|
qp->qp_num = qp_num;
|
|
qp->transport = nt;
|
|
qp->ndev = nt->ndev;
|
|
qp->qp_link = NTB_LINK_DOWN;
|
|
qp->client_ready = NTB_LINK_DOWN;
|
|
qp->event_handler = NULL;
|
|
|
|
if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW)
|
|
num_qps_mw = nt->max_qps / NTB_NUM_MW + 1;
|
|
else
|
|
num_qps_mw = nt->max_qps / NTB_NUM_MW;
|
|
|
|
tx_size = (unsigned int) ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw;
|
|
qp->rx_info = ntb_get_mw_vbase(nt->ndev, mw_num) +
|
|
(qp_num / NTB_NUM_MW * tx_size);
|
|
tx_size -= sizeof(struct ntb_rx_info);
|
|
|
|
qp->tx_mw = qp->rx_info + 1;
|
|
/* Due to housekeeping, there must be atleast 2 buffs */
|
|
qp->tx_max_frame = min(transport_mtu, tx_size / 2);
|
|
qp->tx_max_entry = tx_size / qp->tx_max_frame;
|
|
|
|
if (nt->debugfs_dir) {
|
|
char debugfs_name[4];
|
|
|
|
snprintf(debugfs_name, 4, "qp%d", qp_num);
|
|
qp->debugfs_dir = debugfs_create_dir(debugfs_name,
|
|
nt->debugfs_dir);
|
|
|
|
qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR,
|
|
qp->debugfs_dir, qp,
|
|
&ntb_qp_debugfs_stats);
|
|
}
|
|
|
|
INIT_DELAYED_WORK(&qp->link_work, ntb_qp_link_work);
|
|
INIT_WORK(&qp->link_cleanup, ntb_qp_link_cleanup);
|
|
|
|
spin_lock_init(&qp->ntb_rx_pend_q_lock);
|
|
spin_lock_init(&qp->ntb_rx_free_q_lock);
|
|
spin_lock_init(&qp->ntb_tx_free_q_lock);
|
|
|
|
INIT_LIST_HEAD(&qp->rx_pend_q);
|
|
INIT_LIST_HEAD(&qp->rx_free_q);
|
|
INIT_LIST_HEAD(&qp->tx_free_q);
|
|
}
|
|
|
|
int ntb_transport_init(struct pci_dev *pdev)
|
|
{
|
|
struct ntb_transport *nt;
|
|
int rc, i;
|
|
|
|
nt = kzalloc(sizeof(struct ntb_transport), GFP_KERNEL);
|
|
if (!nt)
|
|
return -ENOMEM;
|
|
|
|
if (debugfs_initialized())
|
|
nt->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
|
|
else
|
|
nt->debugfs_dir = NULL;
|
|
|
|
nt->ndev = ntb_register_transport(pdev, nt);
|
|
if (!nt->ndev) {
|
|
rc = -EIO;
|
|
goto err;
|
|
}
|
|
|
|
nt->max_qps = min(nt->ndev->max_cbs, max_num_clients);
|
|
|
|
nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp),
|
|
GFP_KERNEL);
|
|
if (!nt->qps) {
|
|
rc = -ENOMEM;
|
|
goto err1;
|
|
}
|
|
|
|
nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1;
|
|
|
|
for (i = 0; i < nt->max_qps; i++)
|
|
ntb_transport_init_queue(nt, i);
|
|
|
|
INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work);
|
|
INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup);
|
|
|
|
rc = ntb_register_event_callback(nt->ndev,
|
|
ntb_transport_event_callback);
|
|
if (rc)
|
|
goto err2;
|
|
|
|
INIT_LIST_HEAD(&nt->client_devs);
|
|
rc = ntb_bus_init(nt);
|
|
if (rc)
|
|
goto err3;
|
|
|
|
if (ntb_hw_link_status(nt->ndev))
|
|
schedule_delayed_work(&nt->link_work, 0);
|
|
|
|
return 0;
|
|
|
|
err3:
|
|
ntb_unregister_event_callback(nt->ndev);
|
|
err2:
|
|
kfree(nt->qps);
|
|
err1:
|
|
ntb_unregister_transport(nt->ndev);
|
|
err:
|
|
debugfs_remove_recursive(nt->debugfs_dir);
|
|
kfree(nt);
|
|
return rc;
|
|
}
|
|
|
|
void ntb_transport_free(void *transport)
|
|
{
|
|
struct ntb_transport *nt = transport;
|
|
struct pci_dev *pdev;
|
|
int i;
|
|
|
|
nt->transport_link = NTB_LINK_DOWN;
|
|
|
|
/* verify that all the qp's are freed */
|
|
for (i = 0; i < nt->max_qps; i++)
|
|
if (!test_bit(i, &nt->qp_bitmap))
|
|
ntb_transport_free_queue(&nt->qps[i]);
|
|
|
|
ntb_bus_remove(nt);
|
|
|
|
cancel_delayed_work_sync(&nt->link_work);
|
|
|
|
debugfs_remove_recursive(nt->debugfs_dir);
|
|
|
|
ntb_unregister_event_callback(nt->ndev);
|
|
|
|
pdev = ntb_query_pdev(nt->ndev);
|
|
|
|
for (i = 0; i < NTB_NUM_MW; i++)
|
|
ntb_free_mw(nt, i);
|
|
|
|
kfree(nt->qps);
|
|
ntb_unregister_transport(nt->ndev);
|
|
kfree(nt);
|
|
}
|
|
|
|
static void ntb_rx_copy_task(struct ntb_transport_qp *qp,
|
|
struct ntb_queue_entry *entry, void *offset)
|
|
{
|
|
void *cb_data = entry->cb_data;
|
|
unsigned int len = entry->len;
|
|
|
|
memcpy(entry->buf, offset, entry->len);
|
|
|
|
ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q);
|
|
|
|
if (qp->rx_handler && qp->client_ready == NTB_LINK_UP)
|
|
qp->rx_handler(qp, qp->cb_data, cb_data, len);
|
|
}
|
|
|
|
static int ntb_process_rxc(struct ntb_transport_qp *qp)
|
|
{
|
|
struct ntb_payload_header *hdr;
|
|
struct ntb_queue_entry *entry;
|
|
void *offset;
|
|
|
|
offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index;
|
|
hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header);
|
|
|
|
entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q);
|
|
if (!entry) {
|
|
dev_dbg(&ntb_query_pdev(qp->ndev)->dev,
|
|
"no buffer - HDR ver %u, len %d, flags %x\n",
|
|
hdr->ver, hdr->len, hdr->flags);
|
|
qp->rx_err_no_buf++;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (!(hdr->flags & DESC_DONE_FLAG)) {
|
|
ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry,
|
|
&qp->rx_pend_q);
|
|
qp->rx_ring_empty++;
|
|
return -EAGAIN;
|
|
}
|
|
|
|
if (hdr->ver != (u32) qp->rx_pkts) {
|
|
dev_dbg(&ntb_query_pdev(qp->ndev)->dev,
|
|
"qp %d: version mismatch, expected %llu - got %u\n",
|
|
qp->qp_num, qp->rx_pkts, hdr->ver);
|
|
ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry,
|
|
&qp->rx_pend_q);
|
|
qp->rx_err_ver++;
|
|
return -EIO;
|
|
}
|
|
|
|
if (hdr->flags & LINK_DOWN_FLAG) {
|
|
ntb_qp_link_down(qp);
|
|
|
|
ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry,
|
|
&qp->rx_pend_q);
|
|
goto out;
|
|
}
|
|
|
|
dev_dbg(&ntb_query_pdev(qp->ndev)->dev,
|
|
"rx offset %u, ver %u - %d payload received, buf size %d\n",
|
|
qp->rx_index, hdr->ver, hdr->len, entry->len);
|
|
|
|
if (hdr->len <= entry->len) {
|
|
entry->len = hdr->len;
|
|
ntb_rx_copy_task(qp, entry, offset);
|
|
} else {
|
|
ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry,
|
|
&qp->rx_pend_q);
|
|
|
|
qp->rx_err_oflow++;
|
|
dev_dbg(&ntb_query_pdev(qp->ndev)->dev,
|
|
"RX overflow! Wanted %d got %d\n",
|
|
hdr->len, entry->len);
|
|
}
|
|
|
|
qp->rx_bytes += hdr->len;
|
|
qp->rx_pkts++;
|
|
|
|
out:
|
|
/* Ensure that the data is fully copied out before clearing the flag */
|
|
wmb();
|
|
hdr->flags = 0;
|
|
iowrite32(qp->rx_index, &qp->rx_info->entry);
|
|
|
|
qp->rx_index++;
|
|
qp->rx_index %= qp->rx_max_entry;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ntb_transport_rx(unsigned long data)
|
|
{
|
|
struct ntb_transport_qp *qp = (struct ntb_transport_qp *)data;
|
|
int rc, i;
|
|
|
|
/* Limit the number of packets processed in a single interrupt to
|
|
* provide fairness to others
|
|
*/
|
|
for (i = 0; i < qp->rx_max_entry; i++) {
|
|
rc = ntb_process_rxc(qp);
|
|
if (rc)
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void ntb_transport_rxc_db(void *data, int db_num)
|
|
{
|
|
struct ntb_transport_qp *qp = data;
|
|
|
|
dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n",
|
|
__func__, db_num);
|
|
|
|
tasklet_schedule(&qp->rx_work);
|
|
}
|
|
|
|
static void ntb_tx_copy_task(struct ntb_transport_qp *qp,
|
|
struct ntb_queue_entry *entry,
|
|
void __iomem *offset)
|
|
{
|
|
struct ntb_payload_header __iomem *hdr;
|
|
|
|
memcpy_toio(offset, entry->buf, entry->len);
|
|
|
|
hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header);
|
|
iowrite32(entry->len, &hdr->len);
|
|
iowrite32((u32) qp->tx_pkts, &hdr->ver);
|
|
|
|
/* Ensure that the data is fully copied out before setting the flag */
|
|
wmb();
|
|
iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags);
|
|
|
|
ntb_ring_sdb(qp->ndev, qp->qp_num);
|
|
|
|
/* The entry length can only be zero if the packet is intended to be a
|
|
* "link down" or similar. Since no payload is being sent in these
|
|
* cases, there is nothing to add to the completion queue.
|
|
*/
|
|
if (entry->len > 0) {
|
|
qp->tx_bytes += entry->len;
|
|
|
|
if (qp->tx_handler)
|
|
qp->tx_handler(qp, qp->cb_data, entry->cb_data,
|
|
entry->len);
|
|
}
|
|
|
|
ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, &qp->tx_free_q);
|
|
}
|
|
|
|
static int ntb_process_tx(struct ntb_transport_qp *qp,
|
|
struct ntb_queue_entry *entry)
|
|
{
|
|
void __iomem *offset;
|
|
|
|
offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index;
|
|
|
|
dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%lld - offset %p, tx %u, entry len %d flags %x buff %p\n",
|
|
qp->tx_pkts, offset, qp->tx_index, entry->len, entry->flags,
|
|
entry->buf);
|
|
if (qp->tx_index == qp->remote_rx_info->entry) {
|
|
qp->tx_ring_full++;
|
|
return -EAGAIN;
|
|
}
|
|
|
|
if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) {
|
|
if (qp->tx_handler)
|
|
qp->tx_handler(qp->cb_data, qp, NULL, -EIO);
|
|
|
|
ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry,
|
|
&qp->tx_free_q);
|
|
return 0;
|
|
}
|
|
|
|
ntb_tx_copy_task(qp, entry, offset);
|
|
|
|
qp->tx_index++;
|
|
qp->tx_index %= qp->tx_max_entry;
|
|
|
|
qp->tx_pkts++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ntb_send_link_down(struct ntb_transport_qp *qp)
|
|
{
|
|
struct pci_dev *pdev = ntb_query_pdev(qp->ndev);
|
|
struct ntb_queue_entry *entry;
|
|
int i, rc;
|
|
|
|
if (qp->qp_link == NTB_LINK_DOWN)
|
|
return;
|
|
|
|
qp->qp_link = NTB_LINK_DOWN;
|
|
dev_info(&pdev->dev, "qp %d: Link Down\n", qp->qp_num);
|
|
|
|
for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) {
|
|
entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
|
|
if (entry)
|
|
break;
|
|
msleep(100);
|
|
}
|
|
|
|
if (!entry)
|
|
return;
|
|
|
|
entry->cb_data = NULL;
|
|
entry->buf = NULL;
|
|
entry->len = 0;
|
|
entry->flags = LINK_DOWN_FLAG;
|
|
|
|
rc = ntb_process_tx(qp, entry);
|
|
if (rc)
|
|
dev_err(&pdev->dev, "ntb: QP%d unable to send linkdown msg\n",
|
|
qp->qp_num);
|
|
}
|
|
|
|
/**
|
|
* ntb_transport_create_queue - Create a new NTB transport layer queue
|
|
* @rx_handler: receive callback function
|
|
* @tx_handler: transmit callback function
|
|
* @event_handler: event callback function
|
|
*
|
|
* Create a new NTB transport layer queue and provide the queue with a callback
|
|
* routine for both transmit and receive. The receive callback routine will be
|
|
* used to pass up data when the transport has received it on the queue. The
|
|
* transmit callback routine will be called when the transport has completed the
|
|
* transmission of the data on the queue and the data is ready to be freed.
|
|
*
|
|
* RETURNS: pointer to newly created ntb_queue, NULL on error.
|
|
*/
|
|
struct ntb_transport_qp *
|
|
ntb_transport_create_queue(void *data, struct pci_dev *pdev,
|
|
const struct ntb_queue_handlers *handlers)
|
|
{
|
|
struct ntb_queue_entry *entry;
|
|
struct ntb_transport_qp *qp;
|
|
struct ntb_transport *nt;
|
|
unsigned int free_queue;
|
|
int rc, i;
|
|
|
|
nt = ntb_find_transport(pdev);
|
|
if (!nt)
|
|
goto err;
|
|
|
|
free_queue = ffs(nt->qp_bitmap);
|
|
if (!free_queue)
|
|
goto err;
|
|
|
|
/* decrement free_queue to make it zero based */
|
|
free_queue--;
|
|
|
|
clear_bit(free_queue, &nt->qp_bitmap);
|
|
|
|
qp = &nt->qps[free_queue];
|
|
qp->cb_data = data;
|
|
qp->rx_handler = handlers->rx_handler;
|
|
qp->tx_handler = handlers->tx_handler;
|
|
qp->event_handler = handlers->event_handler;
|
|
|
|
for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
|
|
entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC);
|
|
if (!entry)
|
|
goto err1;
|
|
|
|
ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry,
|
|
&qp->rx_free_q);
|
|
}
|
|
|
|
for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
|
|
entry = kzalloc(sizeof(struct ntb_queue_entry), GFP_ATOMIC);
|
|
if (!entry)
|
|
goto err2;
|
|
|
|
ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry,
|
|
&qp->tx_free_q);
|
|
}
|
|
|
|
tasklet_init(&qp->rx_work, ntb_transport_rx, (unsigned long) qp);
|
|
|
|
rc = ntb_register_db_callback(qp->ndev, free_queue, qp,
|
|
ntb_transport_rxc_db);
|
|
if (rc)
|
|
goto err3;
|
|
|
|
dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num);
|
|
|
|
return qp;
|
|
|
|
err3:
|
|
tasklet_disable(&qp->rx_work);
|
|
err2:
|
|
while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q)))
|
|
kfree(entry);
|
|
err1:
|
|
while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q)))
|
|
kfree(entry);
|
|
set_bit(free_queue, &nt->qp_bitmap);
|
|
err:
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ntb_transport_create_queue);
|
|
|
|
/**
|
|
* ntb_transport_free_queue - Frees NTB transport queue
|
|
* @qp: NTB queue to be freed
|
|
*
|
|
* Frees NTB transport queue
|
|
*/
|
|
void ntb_transport_free_queue(struct ntb_transport_qp *qp)
|
|
{
|
|
struct pci_dev *pdev;
|
|
struct ntb_queue_entry *entry;
|
|
|
|
if (!qp)
|
|
return;
|
|
|
|
pdev = ntb_query_pdev(qp->ndev);
|
|
|
|
cancel_delayed_work_sync(&qp->link_work);
|
|
|
|
ntb_unregister_db_callback(qp->ndev, qp->qp_num);
|
|
tasklet_disable(&qp->rx_work);
|
|
|
|
while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q)))
|
|
kfree(entry);
|
|
|
|
while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) {
|
|
dev_warn(&pdev->dev, "Freeing item from a non-empty queue\n");
|
|
kfree(entry);
|
|
}
|
|
|
|
while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q)))
|
|
kfree(entry);
|
|
|
|
set_bit(qp->qp_num, &qp->transport->qp_bitmap);
|
|
|
|
dev_info(&pdev->dev, "NTB Transport QP %d freed\n", qp->qp_num);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ntb_transport_free_queue);
|
|
|
|
/**
|
|
* ntb_transport_rx_remove - Dequeues enqueued rx packet
|
|
* @qp: NTB queue to be freed
|
|
* @len: pointer to variable to write enqueued buffers length
|
|
*
|
|
* Dequeues unused buffers from receive queue. Should only be used during
|
|
* shutdown of qp.
|
|
*
|
|
* RETURNS: NULL error value on error, or void* for success.
|
|
*/
|
|
void *ntb_transport_rx_remove(struct ntb_transport_qp *qp, unsigned int *len)
|
|
{
|
|
struct ntb_queue_entry *entry;
|
|
void *buf;
|
|
|
|
if (!qp || qp->client_ready == NTB_LINK_UP)
|
|
return NULL;
|
|
|
|
entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q);
|
|
if (!entry)
|
|
return NULL;
|
|
|
|
buf = entry->cb_data;
|
|
*len = entry->len;
|
|
|
|
ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q);
|
|
|
|
return buf;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ntb_transport_rx_remove);
|
|
|
|
/**
|
|
* ntb_transport_rx_enqueue - Enqueue a new NTB queue entry
|
|
* @qp: NTB transport layer queue the entry is to be enqueued on
|
|
* @cb: per buffer pointer for callback function to use
|
|
* @data: pointer to data buffer that incoming packets will be copied into
|
|
* @len: length of the data buffer
|
|
*
|
|
* Enqueue a new receive buffer onto the transport queue into which a NTB
|
|
* payload can be received into.
|
|
*
|
|
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
|
|
*/
|
|
int ntb_transport_rx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
|
|
unsigned int len)
|
|
{
|
|
struct ntb_queue_entry *entry;
|
|
|
|
if (!qp)
|
|
return -EINVAL;
|
|
|
|
entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q);
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
|
|
entry->cb_data = cb;
|
|
entry->buf = data;
|
|
entry->len = len;
|
|
|
|
ntb_list_add(&qp->ntb_rx_pend_q_lock, &entry->entry, &qp->rx_pend_q);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ntb_transport_rx_enqueue);
|
|
|
|
/**
|
|
* ntb_transport_tx_enqueue - Enqueue a new NTB queue entry
|
|
* @qp: NTB transport layer queue the entry is to be enqueued on
|
|
* @cb: per buffer pointer for callback function to use
|
|
* @data: pointer to data buffer that will be sent
|
|
* @len: length of the data buffer
|
|
*
|
|
* Enqueue a new transmit buffer onto the transport queue from which a NTB
|
|
* payload will be transmitted. This assumes that a lock is behing held to
|
|
* serialize access to the qp.
|
|
*
|
|
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
|
|
*/
|
|
int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
|
|
unsigned int len)
|
|
{
|
|
struct ntb_queue_entry *entry;
|
|
int rc;
|
|
|
|
if (!qp || qp->qp_link != NTB_LINK_UP || !len)
|
|
return -EINVAL;
|
|
|
|
entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
|
|
entry->cb_data = cb;
|
|
entry->buf = data;
|
|
entry->len = len;
|
|
entry->flags = 0;
|
|
|
|
rc = ntb_process_tx(qp, entry);
|
|
if (rc)
|
|
ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry,
|
|
&qp->tx_free_q);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ntb_transport_tx_enqueue);
|
|
|
|
/**
|
|
* ntb_transport_link_up - Notify NTB transport of client readiness to use queue
|
|
* @qp: NTB transport layer queue to be enabled
|
|
*
|
|
* Notify NTB transport layer of client readiness to use queue
|
|
*/
|
|
void ntb_transport_link_up(struct ntb_transport_qp *qp)
|
|
{
|
|
if (!qp)
|
|
return;
|
|
|
|
qp->client_ready = NTB_LINK_UP;
|
|
|
|
if (qp->transport->transport_link == NTB_LINK_UP)
|
|
schedule_delayed_work(&qp->link_work, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ntb_transport_link_up);
|
|
|
|
/**
|
|
* ntb_transport_link_down - Notify NTB transport to no longer enqueue data
|
|
* @qp: NTB transport layer queue to be disabled
|
|
*
|
|
* Notify NTB transport layer of client's desire to no longer receive data on
|
|
* transport queue specified. It is the client's responsibility to ensure all
|
|
* entries on queue are purged or otherwise handled appropraitely.
|
|
*/
|
|
void ntb_transport_link_down(struct ntb_transport_qp *qp)
|
|
{
|
|
struct pci_dev *pdev;
|
|
int rc, val;
|
|
|
|
if (!qp)
|
|
return;
|
|
|
|
pdev = ntb_query_pdev(qp->ndev);
|
|
qp->client_ready = NTB_LINK_DOWN;
|
|
|
|
rc = ntb_read_local_spad(qp->ndev, QP_LINKS, &val);
|
|
if (rc) {
|
|
dev_err(&pdev->dev, "Error reading spad %d\n", QP_LINKS);
|
|
return;
|
|
}
|
|
|
|
rc = ntb_write_remote_spad(qp->ndev, QP_LINKS,
|
|
val & ~(1 << qp->qp_num));
|
|
if (rc)
|
|
dev_err(&pdev->dev, "Error writing %x to remote spad %d\n",
|
|
val & ~(1 << qp->qp_num), QP_LINKS);
|
|
|
|
if (qp->qp_link == NTB_LINK_UP)
|
|
ntb_send_link_down(qp);
|
|
else
|
|
cancel_delayed_work_sync(&qp->link_work);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ntb_transport_link_down);
|
|
|
|
/**
|
|
* ntb_transport_link_query - Query transport link state
|
|
* @qp: NTB transport layer queue to be queried
|
|
*
|
|
* Query connectivity to the remote system of the NTB transport queue
|
|
*
|
|
* RETURNS: true for link up or false for link down
|
|
*/
|
|
bool ntb_transport_link_query(struct ntb_transport_qp *qp)
|
|
{
|
|
if (!qp)
|
|
return false;
|
|
|
|
return qp->qp_link == NTB_LINK_UP;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ntb_transport_link_query);
|
|
|
|
/**
|
|
* ntb_transport_qp_num - Query the qp number
|
|
* @qp: NTB transport layer queue to be queried
|
|
*
|
|
* Query qp number of the NTB transport queue
|
|
*
|
|
* RETURNS: a zero based number specifying the qp number
|
|
*/
|
|
unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp)
|
|
{
|
|
if (!qp)
|
|
return 0;
|
|
|
|
return qp->qp_num;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ntb_transport_qp_num);
|
|
|
|
/**
|
|
* ntb_transport_max_size - Query the max payload size of a qp
|
|
* @qp: NTB transport layer queue to be queried
|
|
*
|
|
* Query the maximum payload size permissible on the given qp
|
|
*
|
|
* RETURNS: the max payload size of a qp
|
|
*/
|
|
unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp)
|
|
{
|
|
if (!qp)
|
|
return 0;
|
|
|
|
return qp->tx_max_frame - sizeof(struct ntb_payload_header);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ntb_transport_max_size);
|