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ntb_transport.c
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ntb_transport.c
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/*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2012 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* BSD LICENSE
*
* Copyright(c) 2012 Intel Corporation. All rights reserved.
*
* 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 copy
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Intel PCIe NTB Linux driver
*
* Contact Information:
* Jon Mason <[email protected]>
*/
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/types.h>
#include "ntb_hw.h"
#define NTB_TRANSPORT_VERSION 3
static unsigned int transport_mtu = 0x401E;
module_param(transport_mtu, uint, 0644);
MODULE_PARM_DESC(transport_mtu, "Maximum size of NTB transport packets");
static unsigned char max_num_clients;
module_param(max_num_clients, byte, 0644);
MODULE_PARM_DESC(max_num_clients, "Maximum number of NTB transport clients");
static unsigned int copy_bytes = 1024;
module_param(copy_bytes, uint, 0644);
MODULE_PARM_DESC(copy_bytes, "Threshold under which NTB will use the CPU to copy instead of DMA");
struct ntb_queue_entry {
/* ntb_queue list reference */
struct list_head entry;
/* pointers to data to be transfered */
void *cb_data;
void *buf;
unsigned int len;
unsigned int flags;
struct ntb_transport_qp *qp;
union {
struct ntb_payload_header __iomem *tx_hdr;
struct ntb_payload_header *rx_hdr;
};
unsigned int index;
};
struct ntb_rx_info {
unsigned int entry;
};
struct ntb_transport_qp {
struct ntb_transport *transport;
struct ntb_device *ndev;
void *cb_data;
struct dma_chan *dma_chan;
bool client_ready;
bool qp_link;
u8 qp_num; /* Only 64 QP's are allowed. 0-63 */
struct ntb_rx_info __iomem *rx_info;
struct ntb_rx_info *remote_rx_info;
void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data,
void *data, int len);
struct list_head tx_free_q;
spinlock_t ntb_tx_free_q_lock;
void __iomem *tx_mw;
dma_addr_t tx_mw_phys;
unsigned int tx_index;
unsigned int tx_max_entry;
unsigned int tx_max_frame;
void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data,
void *data, int len);
struct list_head rx_pend_q;
struct list_head rx_free_q;
spinlock_t ntb_rx_pend_q_lock;
spinlock_t ntb_rx_free_q_lock;
void *rx_buff;
unsigned int rx_index;
unsigned int rx_max_entry;
unsigned int rx_max_frame;
dma_cookie_t last_cookie;
void (*event_handler)(void *data, int status);
struct delayed_work link_work;
struct work_struct link_cleanup;
struct dentry *debugfs_dir;
struct dentry *debugfs_stats;
/* Stats */
u64 rx_bytes;
u64 rx_pkts;
u64 rx_ring_empty;
u64 rx_err_no_buf;
u64 rx_err_oflow;
u64 rx_err_ver;
u64 rx_memcpy;
u64 rx_async;
u64 tx_bytes;
u64 tx_pkts;
u64 tx_ring_full;
u64 tx_err_no_buf;
u64 tx_memcpy;
u64 tx_async;
};
struct ntb_transport_mw {
size_t size;
void *virt_addr;
dma_addr_t dma_addr;
};
struct ntb_transport_client_dev {
struct list_head entry;
struct device dev;
};
struct ntb_transport {
struct list_head entry;
struct list_head client_devs;
struct ntb_device *ndev;
struct ntb_transport_mw *mw;
struct ntb_transport_qp *qps;
unsigned int max_qps;
unsigned long qp_bitmap;
bool transport_link;
struct delayed_work link_work;
struct work_struct link_cleanup;
};
enum {
DESC_DONE_FLAG = 1 << 0,
LINK_DOWN_FLAG = 1 << 1,
};
struct ntb_payload_header {
unsigned int ver;
unsigned int len;
unsigned int flags;
};
enum {
VERSION = 0,
QP_LINKS,
NUM_QPS,
NUM_MWS,
MW0_SZ_HIGH,
MW0_SZ_LOW,
MW1_SZ_HIGH,
MW1_SZ_LOW,
MAX_SPAD,
};
#define QP_TO_MW(ndev, qp) ((qp) % ntb_max_mw(ndev))
#define NTB_QP_DEF_NUM_ENTRIES 100
#define NTB_LINK_DOWN_TIMEOUT 10
static int ntb_match_bus(struct device *dev, struct device_driver *drv)
{
return !strncmp(dev_name(dev), drv->name, strlen(drv->name));
}
static int ntb_client_probe(struct device *dev)
{
const struct ntb_client *drv = container_of(dev->driver,
struct ntb_client, driver);
struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev);
int rc = -EINVAL;
get_device(dev);
if (drv && drv->probe)
rc = drv->probe(pdev);
if (rc)
put_device(dev);
return rc;
}
static int ntb_client_remove(struct device *dev)
{
const struct ntb_client *drv = container_of(dev->driver,
struct ntb_client, driver);
struct pci_dev *pdev = container_of(dev->parent, struct pci_dev, dev);
if (drv && drv->remove)
drv->remove(pdev);
put_device(dev);
return 0;
}
static struct bus_type ntb_bus_type = {
.name = "ntb_bus",
.match = ntb_match_bus,
.probe = ntb_client_probe,
.remove = ntb_client_remove,
};
static LIST_HEAD(ntb_transport_list);
static int ntb_bus_init(struct ntb_transport *nt)
{
if (list_empty(&ntb_transport_list)) {
int rc = bus_register(&ntb_bus_type);
if (rc)
return rc;
}
list_add(&nt->entry, &ntb_transport_list);
return 0;
}
static void ntb_bus_remove(struct ntb_transport *nt)
{
struct ntb_transport_client_dev *client_dev, *cd;
list_for_each_entry_safe(client_dev, cd, &nt->client_devs, entry) {
dev_err(client_dev->dev.parent, "%s still attached to bus, removing\n",
dev_name(&client_dev->dev));
list_del(&client_dev->entry);
device_unregister(&client_dev->dev);
}
list_del(&nt->entry);
if (list_empty(&ntb_transport_list))
bus_unregister(&ntb_bus_type);
}
static void ntb_client_release(struct device *dev)
{
struct ntb_transport_client_dev *client_dev;
client_dev = container_of(dev, struct ntb_transport_client_dev, dev);
kfree(client_dev);
}
/**
* ntb_unregister_client_dev - Unregister NTB client device
* @device_name: Name of NTB client device
*
* Unregister an NTB client device with the NTB transport layer
*/
void ntb_unregister_client_dev(char *device_name)
{
struct ntb_transport_client_dev *client, *cd;
struct ntb_transport *nt;
list_for_each_entry(nt, &ntb_transport_list, entry)
list_for_each_entry_safe(client, cd, &nt->client_devs, entry)
if (!strncmp(dev_name(&client->dev), device_name,
strlen(device_name))) {
list_del(&client->entry);
device_unregister(&client->dev);
}
}
EXPORT_SYMBOL_GPL(ntb_unregister_client_dev);
/**
* ntb_register_client_dev - Register NTB client device
* @device_name: Name of NTB client device
*
* Register an NTB client device with the NTB transport layer
*/
int ntb_register_client_dev(char *device_name)
{
struct ntb_transport_client_dev *client_dev;
struct ntb_transport *nt;
int rc, i = 0;
if (list_empty(&ntb_transport_list))
return -ENODEV;
list_for_each_entry(nt, &ntb_transport_list, entry) {
struct device *dev;
client_dev = kzalloc(sizeof(struct ntb_transport_client_dev),
GFP_KERNEL);
if (!client_dev) {
rc = -ENOMEM;
goto err;
}
dev = &client_dev->dev;
/* setup and register client devices */
dev_set_name(dev, "%s%d", device_name, i);
dev->bus = &ntb_bus_type;
dev->release = ntb_client_release;
dev->parent = &ntb_query_pdev(nt->ndev)->dev;
rc = device_register(dev);
if (rc) {
kfree(client_dev);
goto err;
}
list_add_tail(&client_dev->entry, &nt->client_devs);
i++;
}
return 0;
err:
ntb_unregister_client_dev(device_name);
return rc;
}
EXPORT_SYMBOL_GPL(ntb_register_client_dev);
/**
* ntb_register_client - Register NTB client driver
* @drv: NTB client driver to be registered
*
* Register an NTB client driver with the NTB transport layer
*
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
*/
int ntb_register_client(struct ntb_client *drv)
{
drv->driver.bus = &ntb_bus_type;
if (list_empty(&ntb_transport_list))
return -ENODEV;
return driver_register(&drv->driver);
}
EXPORT_SYMBOL_GPL(ntb_register_client);
/**
* ntb_unregister_client - Unregister NTB client driver
* @drv: NTB client driver to be unregistered
*
* Unregister an NTB client driver with the NTB transport layer
*
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
*/
void ntb_unregister_client(struct ntb_client *drv)
{
driver_unregister(&drv->driver);
}
EXPORT_SYMBOL_GPL(ntb_unregister_client);
static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
loff_t *offp)
{
struct ntb_transport_qp *qp;
char *buf;
ssize_t ret, out_offset, out_count;
out_count = 1000;
buf = kmalloc(out_count, GFP_KERNEL);
if (!buf)
return -ENOMEM;
qp = filp->private_data;
out_offset = 0;
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"NTB QP stats\n");
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_bytes - \t%llu\n", qp->rx_bytes);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_pkts - \t%llu\n", qp->rx_pkts);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_memcpy - \t%llu\n", qp->rx_memcpy);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_async - \t%llu\n", qp->rx_async);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_ring_empty - %llu\n", qp->rx_ring_empty);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_err_no_buf - %llu\n", qp->rx_err_no_buf);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_err_oflow - \t%llu\n", qp->rx_err_oflow);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_err_ver - \t%llu\n", qp->rx_err_ver);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_buff - \t%p\n", qp->rx_buff);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_index - \t%u\n", qp->rx_index);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"rx_max_entry - \t%u\n", qp->rx_max_entry);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_bytes - \t%llu\n", qp->tx_bytes);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_pkts - \t%llu\n", qp->tx_pkts);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_memcpy - \t%llu\n", qp->tx_memcpy);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_async - \t%llu\n", qp->tx_async);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_ring_full - \t%llu\n", qp->tx_ring_full);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_err_no_buf - %llu\n", qp->tx_err_no_buf);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_mw - \t%p\n", qp->tx_mw);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_index - \t%u\n", qp->tx_index);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_max_entry - \t%u\n", qp->tx_max_entry);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"\nQP Link %s\n", (qp->qp_link == NTB_LINK_UP) ?
"Up" : "Down");
if (out_offset > out_count)
out_offset = out_count;
ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
kfree(buf);
return ret;
}
static const struct file_operations ntb_qp_debugfs_stats = {
.owner = THIS_MODULE,
.open = simple_open,
.read = debugfs_read,
};
static void ntb_list_add(spinlock_t *lock, struct list_head *entry,
struct list_head *list)
{
unsigned long flags;
spin_lock_irqsave(lock, flags);
list_add_tail(entry, list);
spin_unlock_irqrestore(lock, flags);
}
static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock,
struct list_head *list)
{
struct ntb_queue_entry *entry;
unsigned long flags;
spin_lock_irqsave(lock, flags);
if (list_empty(list)) {
entry = NULL;
goto out;
}
entry = list_first_entry(list, struct ntb_queue_entry, entry);
list_del(&entry->entry);
out:
spin_unlock_irqrestore(lock, flags);
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, mw_max;
unsigned int i;
mw_max = ntb_max_mw(nt->ndev);
mw_num = QP_TO_MW(nt->ndev, qp_num);
WARN_ON(nt->mw[mw_num].virt_addr == NULL);
if (nt->max_qps % mw_max && mw_num + 1 < nt->max_qps / mw_max)
num_qps_mw = nt->max_qps / mw_max + 1;
else
num_qps_mw = nt->max_qps / mw_max;
rx_size = (unsigned int) nt->mw[mw_num].size / num_qps_mw;
qp->rx_buff = nt->mw[mw_num].virt_addr + qp_num / mw_max * rx_size;
rx_size -= sizeof(struct ntb_rx_info);
qp->remote_rx_info = qp->rx_buff + rx_size;
/* 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;
}
/*
* we must ensure that the memory address allocated is BAR size
* aligned in order for the XLAT register to take the value. This
* is a requirement of the hardware. It is recommended to setup CMA
* for BAR sizes equal or greater than 4MB.
*/
if (!IS_ALIGNED(mw->dma_addr, mw->size)) {
dev_err(&pdev->dev, "DMA memory %pad not aligned to BAR size\n",
&mw->dma_addr);
ntb_free_mw(nt, num_mw);
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 ntb_transport_qp *qp)
{
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;
}
static void ntb_qp_link_cleanup_work(struct work_struct *work)
{
struct ntb_transport_qp *qp = container_of(work,
struct ntb_transport_qp,
link_cleanup);
struct ntb_transport *nt = qp->transport;
ntb_qp_link_cleanup(qp);
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 ntb_transport *nt)
{
int i;
/* 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_cleanup(&nt->qps[i]);
if (nt->transport_link == NTB_LINK_DOWN)
cancel_delayed_work_sync(&nt->link_work);
else
nt->transport_link = NTB_LINK_DOWN;
/* 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_link_cleanup_work(struct work_struct *work)
{
struct ntb_transport *nt = container_of(work, struct ntb_transport,
link_cleanup);
ntb_transport_link_cleanup(nt);
}
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_max_mw(ndev); 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_max_mw(ndev));
if (rc) {
dev_err(&pdev->dev, "Error writing %x to remote spad %d\n",
ntb_max_mw(ndev), 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_max_mw(ndev))
goto out;
dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val);
for (i = 0; i < ntb_max_mw(ndev); 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_max_mw(ndev); 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 int 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, mw_max;
u64 qp_offset;
mw_max = ntb_max_mw(nt->ndev);
mw_num = QP_TO_MW(nt->ndev, 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 % mw_max && mw_num + 1 < nt->max_qps / mw_max)
num_qps_mw = nt->max_qps / mw_max + 1;
else
num_qps_mw = nt->max_qps / mw_max;
tx_size = (unsigned int) ntb_get_mw_size(qp->ndev, mw_num) / num_qps_mw;
qp_offset = qp_num / mw_max * tx_size;
qp->tx_mw = ntb_get_mw_vbase(nt->ndev, mw_num) + qp_offset;
if (!qp->tx_mw)
return -EINVAL;
qp->tx_mw_phys = ntb_get_mw_base(qp->ndev, mw_num) + qp_offset;
if (!qp->tx_mw_phys)
return -EINVAL;
tx_size -= sizeof(struct ntb_rx_info);
qp->rx_info = qp->tx_mw + tx_size;
/* 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 (ntb_query_debugfs(nt->ndev)) {
char debugfs_name[4];
snprintf(debugfs_name, 4, "qp%d", qp_num);
qp->debugfs_dir = debugfs_create_dir(debugfs_name,
ntb_query_debugfs(nt->ndev));
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_work);
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);
return 0;
}
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;
nt->ndev = ntb_register_transport(pdev, nt);
if (!nt->ndev) {
rc = -EIO;
goto err;
}
nt->mw = kcalloc(ntb_max_mw(nt->ndev), sizeof(struct ntb_transport_mw),
GFP_KERNEL);
if (!nt->mw) {
rc = -ENOMEM;
goto err1;
}
if (max_num_clients)
nt->max_qps = min(ntb_max_cbs(nt->ndev), max_num_clients);
else
nt->max_qps = min(ntb_max_cbs(nt->ndev), ntb_max_mw(nt->ndev));
nt->qps = kcalloc(nt->max_qps, sizeof(struct ntb_transport_qp),
GFP_KERNEL);
if (!nt->qps) {
rc = -ENOMEM;
goto err2;
}
nt->qp_bitmap = ((u64) 1 << nt->max_qps) - 1;
for (i = 0; i < nt->max_qps; i++) {
rc = ntb_transport_init_queue(nt, i);
if (rc)
goto err3;
}
INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work);
INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work);
rc = ntb_register_event_callback(nt->ndev,
ntb_transport_event_callback);
if (rc)
goto err3;
INIT_LIST_HEAD(&nt->client_devs);
rc = ntb_bus_init(nt);
if (rc)
goto err4;
if (ntb_hw_link_status(nt->ndev))
schedule_delayed_work(&nt->link_work, 0);
return 0;
err4:
ntb_unregister_event_callback(nt->ndev);
err3:
kfree(nt->qps);
err2:
kfree(nt->mw);
err1:
ntb_unregister_transport(nt->ndev);
err:
kfree(nt);
return rc;
}
void ntb_transport_free(void *transport)
{
struct ntb_transport *nt = transport;
struct ntb_device *ndev = nt->ndev;
int i;
ntb_transport_link_cleanup(nt);