| /* |
| * 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. |
| * Copyright (C) 2015 EMC 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. |
| * Copyright (C) 2015 EMC 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. |
| * |
| * PCIe NTB Transport Linux driver |
| * |
| * Contact Information: |
| * Jon Mason <jon.mason@intel.com> |
| */ |
| #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 <linux/uaccess.h> |
| #include "linux/ntb.h" |
| #include "linux/ntb_transport.h" |
| |
| #define NTB_TRANSPORT_VERSION 4 |
| #define NTB_TRANSPORT_VER "4" |
| #define NTB_TRANSPORT_NAME "ntb_transport" |
| #define NTB_TRANSPORT_DESC "Software Queue-Pair Transport over NTB" |
| |
| MODULE_DESCRIPTION(NTB_TRANSPORT_DESC); |
| MODULE_VERSION(NTB_TRANSPORT_VER); |
| MODULE_LICENSE("Dual BSD/GPL"); |
| MODULE_AUTHOR("Intel Corporation"); |
| |
| static unsigned long max_mw_size; |
| module_param(max_mw_size, ulong, 0644); |
| MODULE_PARM_DESC(max_mw_size, "Limit size of large memory windows"); |
| |
| static unsigned int transport_mtu = 0x10000; |
| 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"); |
| |
| static bool use_dma; |
| module_param(use_dma, bool, 0644); |
| MODULE_PARM_DESC(use_dma, "Use DMA engine to perform large data copy"); |
| |
| static struct dentry *nt_debugfs_dir; |
| |
| struct ntb_queue_entry { |
| /* ntb_queue list reference */ |
| struct list_head entry; |
| /* pointers to data to be transferred */ |
| void *cb_data; |
| void *buf; |
| unsigned int len; |
| unsigned int flags; |
| int retries; |
| int errors; |
| unsigned int tx_index; |
| unsigned int rx_index; |
| |
| struct ntb_transport_qp *qp; |
| union { |
| struct ntb_payload_header __iomem *tx_hdr; |
| struct ntb_payload_header *rx_hdr; |
| }; |
| }; |
| |
| struct ntb_rx_info { |
| unsigned int entry; |
| }; |
| |
| struct ntb_transport_qp { |
| struct ntb_transport_ctx *transport; |
| struct ntb_dev *ndev; |
| void *cb_data; |
| struct dma_chan *tx_dma_chan; |
| struct dma_chan *rx_dma_chan; |
| |
| bool client_ready; |
| bool link_is_up; |
| bool active; |
| |
| u8 qp_num; /* Only 64 QP's are allowed. 0-63 */ |
| u64 qp_bit; |
| |
| 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_post_q; |
| struct list_head rx_pend_q; |
| struct list_head rx_free_q; |
| /* ntb_rx_q_lock: synchronize access to rx_XXXX_q */ |
| spinlock_t ntb_rx_q_lock; |
| void *rx_buff; |
| unsigned int rx_index; |
| unsigned int rx_max_entry; |
| unsigned int rx_max_frame; |
| unsigned int rx_alloc_entry; |
| dma_cookie_t last_cookie; |
| struct tasklet_struct rxc_db_work; |
| |
| 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 { |
| phys_addr_t phys_addr; |
| resource_size_t phys_size; |
| resource_size_t xlat_align; |
| resource_size_t xlat_align_size; |
| void __iomem *vbase; |
| size_t xlat_size; |
| size_t buff_size; |
| void *virt_addr; |
| dma_addr_t dma_addr; |
| }; |
| |
| struct ntb_transport_client_dev { |
| struct list_head entry; |
| struct ntb_transport_ctx *nt; |
| struct device dev; |
| }; |
| |
| struct ntb_transport_ctx { |
| struct list_head entry; |
| struct list_head client_devs; |
| |
| struct ntb_dev *ndev; |
| |
| struct ntb_transport_mw *mw_vec; |
| struct ntb_transport_qp *qp_vec; |
| unsigned int mw_count; |
| unsigned int qp_count; |
| u64 qp_bitmap; |
| u64 qp_bitmap_free; |
| |
| bool link_is_up; |
| struct delayed_work link_work; |
| struct work_struct link_cleanup; |
| |
| struct dentry *debugfs_node_dir; |
| }; |
| |
| enum { |
| DESC_DONE_FLAG = BIT(0), |
| LINK_DOWN_FLAG = BIT(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 dev_client_dev(__dev) \ |
| container_of((__dev), struct ntb_transport_client_dev, dev) |
| |
| #define drv_client(__drv) \ |
| container_of((__drv), struct ntb_transport_client, driver) |
| |
| #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count) |
| #define NTB_QP_DEF_NUM_ENTRIES 100 |
| #define NTB_LINK_DOWN_TIMEOUT 10 |
| |
| static void ntb_transport_rxc_db(unsigned long data); |
| static const struct ntb_ctx_ops ntb_transport_ops; |
| static struct ntb_client ntb_transport_client; |
| static int ntb_async_tx_submit(struct ntb_transport_qp *qp, |
| struct ntb_queue_entry *entry); |
| static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset); |
| static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset); |
| static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset); |
| |
| |
| static int ntb_transport_bus_match(struct device *dev, |
| struct device_driver *drv) |
| { |
| return !strncmp(dev_name(dev), drv->name, strlen(drv->name)); |
| } |
| |
| static int ntb_transport_bus_probe(struct device *dev) |
| { |
| const struct ntb_transport_client *client; |
| int rc = -EINVAL; |
| |
| get_device(dev); |
| |
| client = drv_client(dev->driver); |
| rc = client->probe(dev); |
| if (rc) |
| put_device(dev); |
| |
| return rc; |
| } |
| |
| static int ntb_transport_bus_remove(struct device *dev) |
| { |
| const struct ntb_transport_client *client; |
| |
| client = drv_client(dev->driver); |
| client->remove(dev); |
| |
| put_device(dev); |
| |
| return 0; |
| } |
| |
| static struct bus_type ntb_transport_bus = { |
| .name = "ntb_transport", |
| .match = ntb_transport_bus_match, |
| .probe = ntb_transport_bus_probe, |
| .remove = ntb_transport_bus_remove, |
| }; |
| |
| static LIST_HEAD(ntb_transport_list); |
| |
| static int ntb_bus_init(struct ntb_transport_ctx *nt) |
| { |
| list_add_tail(&nt->entry, &ntb_transport_list); |
| return 0; |
| } |
| |
| static void ntb_bus_remove(struct ntb_transport_ctx *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); |
| } |
| |
| static void ntb_transport_client_release(struct device *dev) |
| { |
| struct ntb_transport_client_dev *client_dev; |
| |
| client_dev = dev_client_dev(dev); |
| kfree(client_dev); |
| } |
| |
| /** |
| * ntb_transport_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_transport_unregister_client_dev(char *device_name) |
| { |
| struct ntb_transport_client_dev *client, *cd; |
| struct ntb_transport_ctx *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_transport_unregister_client_dev); |
| |
| /** |
| * ntb_transport_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_transport_register_client_dev(char *device_name) |
| { |
| struct ntb_transport_client_dev *client_dev; |
| struct ntb_transport_ctx *nt; |
| int node; |
| int rc, i = 0; |
| |
| if (list_empty(&ntb_transport_list)) |
| return -ENODEV; |
| |
| list_for_each_entry(nt, &ntb_transport_list, entry) { |
| struct device *dev; |
| |
| node = dev_to_node(&nt->ndev->dev); |
| |
| client_dev = kzalloc_node(sizeof(*client_dev), |
| GFP_KERNEL, node); |
| 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_transport_bus; |
| dev->release = ntb_transport_client_release; |
| dev->parent = &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_transport_unregister_client_dev(device_name); |
| |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev); |
| |
| /** |
| * ntb_transport_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_transport_register_client(struct ntb_transport_client *drv) |
| { |
| drv->driver.bus = &ntb_transport_bus; |
| |
| if (list_empty(&ntb_transport_list)) |
| return -ENODEV; |
| |
| return driver_register(&drv->driver); |
| } |
| EXPORT_SYMBOL_GPL(ntb_transport_register_client); |
| |
| /** |
| * ntb_transport_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_transport_unregister_client(struct ntb_transport_client *drv) |
| { |
| driver_unregister(&drv->driver); |
| } |
| EXPORT_SYMBOL_GPL(ntb_transport_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; |
| |
| qp = filp->private_data; |
| |
| if (!qp || !qp->link_is_up) |
| return 0; |
| |
| out_count = 1000; |
| |
| buf = kmalloc(out_count, GFP_KERNEL); |
| if (!buf) |
| return -ENOMEM; |
| |
| out_offset = 0; |
| out_offset += snprintf(buf + out_offset, out_count - out_offset, |
| "\nNTB QP stats:\n\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 - \t0x%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, |
| "rx_alloc_entry - \t%u\n\n", qp->rx_alloc_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 - \t0x%p\n", qp->tx_mw); |
| out_offset += snprintf(buf + out_offset, out_count - out_offset, |
| "tx_index (H) - \t%u\n", qp->tx_index); |
| out_offset += snprintf(buf + out_offset, out_count - out_offset, |
| "RRI (T) - \t%u\n", |
| qp->remote_rx_info->entry); |
| 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, |
| "free tx - \t%u\n", |
| ntb_transport_tx_free_entry(qp)); |
| |
| out_offset += snprintf(buf + out_offset, out_count - out_offset, |
| "\n"); |
| out_offset += snprintf(buf + out_offset, out_count - out_offset, |
| "Using TX DMA - \t%s\n", |
| qp->tx_dma_chan ? "Yes" : "No"); |
| out_offset += snprintf(buf + out_offset, out_count - out_offset, |
| "Using RX DMA - \t%s\n", |
| qp->rx_dma_chan ? "Yes" : "No"); |
| out_offset += snprintf(buf + out_offset, out_count - out_offset, |
| "QP Link - \t%s\n", |
| qp->link_is_up ? "Up" : "Down"); |
| out_offset += snprintf(buf + out_offset, out_count - out_offset, |
| "\n"); |
| |
| 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 struct ntb_queue_entry *ntb_list_mv(spinlock_t *lock, |
| struct list_head *list, |
| struct list_head *to_list) |
| { |
| struct ntb_queue_entry *entry; |
| unsigned long flags; |
| |
| spin_lock_irqsave(lock, flags); |
| |
| if (list_empty(list)) { |
| entry = NULL; |
| } else { |
| entry = list_first_entry(list, struct ntb_queue_entry, entry); |
| list_move_tail(&entry->entry, to_list); |
| } |
| |
| spin_unlock_irqrestore(lock, flags); |
| |
| return entry; |
| } |
| |
| static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, |
| unsigned int qp_num) |
| { |
| struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; |
| struct ntb_transport_mw *mw; |
| struct ntb_dev *ndev = nt->ndev; |
| struct ntb_queue_entry *entry; |
| unsigned int rx_size, num_qps_mw; |
| unsigned int mw_num, mw_count, qp_count; |
| unsigned int i; |
| int node; |
| |
| mw_count = nt->mw_count; |
| qp_count = nt->qp_count; |
| |
| mw_num = QP_TO_MW(nt, qp_num); |
| mw = &nt->mw_vec[mw_num]; |
| |
| if (!mw->virt_addr) |
| return -ENOMEM; |
| |
| if (mw_num < qp_count % mw_count) |
| num_qps_mw = qp_count / mw_count + 1; |
| else |
| num_qps_mw = qp_count / mw_count; |
| |
| rx_size = (unsigned int)mw->xlat_size / num_qps_mw; |
| qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count); |
| 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; |
| |
| /* |
| * Checking to see if we have more entries than the default. |
| * We should add additional entries if that is the case so we |
| * can be in sync with the transport frames. |
| */ |
| node = dev_to_node(&ndev->dev); |
| for (i = qp->rx_alloc_entry; i < qp->rx_max_entry; i++) { |
| entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
| if (!entry) |
| return -ENOMEM; |
| |
| entry->qp = qp; |
| ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, |
| &qp->rx_free_q); |
| qp->rx_alloc_entry++; |
| } |
| |
| 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; |
| |
| return 0; |
| } |
| |
| static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) |
| { |
| struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
| struct pci_dev *pdev = nt->ndev->pdev; |
| |
| if (!mw->virt_addr) |
| return; |
| |
| ntb_mw_clear_trans(nt->ndev, num_mw); |
| dma_free_coherent(&pdev->dev, mw->buff_size, |
| mw->virt_addr, mw->dma_addr); |
| mw->xlat_size = 0; |
| mw->buff_size = 0; |
| mw->virt_addr = NULL; |
| } |
| |
| static int ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, |
| resource_size_t size) |
| { |
| struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; |
| struct pci_dev *pdev = nt->ndev->pdev; |
| size_t xlat_size, buff_size; |
| int rc; |
| |
| if (!size) |
| return -EINVAL; |
| |
| xlat_size = round_up(size, mw->xlat_align_size); |
| buff_size = round_up(size, mw->xlat_align); |
| |
| /* No need to re-setup */ |
| if (mw->xlat_size == xlat_size) |
| return 0; |
| |
| if (mw->buff_size) |
| ntb_free_mw(nt, num_mw); |
| |
| /* Alloc memory for receiving data. Must be aligned */ |
| mw->xlat_size = xlat_size; |
| mw->buff_size = buff_size; |
| |
| mw->virt_addr = dma_alloc_coherent(&pdev->dev, buff_size, |
| &mw->dma_addr, GFP_KERNEL); |
| if (!mw->virt_addr) { |
| mw->xlat_size = 0; |
| mw->buff_size = 0; |
| dev_err(&pdev->dev, "Unable to alloc MW buff of size %zu\n", |
| buff_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->xlat_align)) { |
| dev_err(&pdev->dev, "DMA memory %pad is not aligned\n", |
| &mw->dma_addr); |
| ntb_free_mw(nt, num_mw); |
| return -ENOMEM; |
| } |
| |
| /* Notify HW the memory location of the receive buffer */ |
| rc = ntb_mw_set_trans(nt->ndev, num_mw, mw->dma_addr, mw->xlat_size); |
| if (rc) { |
| dev_err(&pdev->dev, "Unable to set mw%d translation", num_mw); |
| ntb_free_mw(nt, num_mw); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp) |
| { |
| qp->link_is_up = false; |
| qp->active = false; |
| |
| qp->tx_index = 0; |
| qp->rx_index = 0; |
| qp->rx_bytes = 0; |
| qp->rx_pkts = 0; |
| qp->rx_ring_empty = 0; |
| qp->rx_err_no_buf = 0; |
| qp->rx_err_oflow = 0; |
| qp->rx_err_ver = 0; |
| qp->rx_memcpy = 0; |
| qp->rx_async = 0; |
| qp->tx_bytes = 0; |
| qp->tx_pkts = 0; |
| qp->tx_ring_full = 0; |
| qp->tx_err_no_buf = 0; |
| qp->tx_memcpy = 0; |
| qp->tx_async = 0; |
| } |
| |
| static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp) |
| { |
| struct ntb_transport_ctx *nt = qp->transport; |
| struct pci_dev *pdev = nt->ndev->pdev; |
| |
| dev_info(&pdev->dev, "qp %d: Link Cleanup\n", qp->qp_num); |
| |
| cancel_delayed_work_sync(&qp->link_work); |
| ntb_qp_link_down_reset(qp); |
| |
| if (qp->event_handler) |
| qp->event_handler(qp->cb_data, qp->link_is_up); |
| } |
| |
| 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_ctx *nt = qp->transport; |
| |
| ntb_qp_link_cleanup(qp); |
| |
| if (nt->link_is_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_ctx *nt) |
| { |
| struct ntb_transport_qp *qp; |
| u64 qp_bitmap_alloc; |
| int i; |
| |
| qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; |
| |
| /* Pass along the info to any clients */ |
| for (i = 0; i < nt->qp_count; i++) |
| if (qp_bitmap_alloc & BIT_ULL(i)) { |
| qp = &nt->qp_vec[i]; |
| ntb_qp_link_cleanup(qp); |
| cancel_work_sync(&qp->link_cleanup); |
| cancel_delayed_work_sync(&qp->link_work); |
| } |
| |
| if (!nt->link_is_up) |
| cancel_delayed_work_sync(&nt->link_work); |
| |
| /* 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_spad_write(nt->ndev, i, 0); |
| } |
| |
| static void ntb_transport_link_cleanup_work(struct work_struct *work) |
| { |
| struct ntb_transport_ctx *nt = |
| container_of(work, struct ntb_transport_ctx, link_cleanup); |
| |
| ntb_transport_link_cleanup(nt); |
| } |
| |
| static void ntb_transport_event_callback(void *data) |
| { |
| struct ntb_transport_ctx *nt = data; |
| |
| if (ntb_link_is_up(nt->ndev, NULL, NULL) == 1) |
| schedule_delayed_work(&nt->link_work, 0); |
| else |
| schedule_work(&nt->link_cleanup); |
| } |
| |
| static void ntb_transport_link_work(struct work_struct *work) |
| { |
| struct ntb_transport_ctx *nt = |
| container_of(work, struct ntb_transport_ctx, link_work.work); |
| struct ntb_dev *ndev = nt->ndev; |
| struct pci_dev *pdev = ndev->pdev; |
| resource_size_t size; |
| u32 val; |
| int rc = 0, i, spad; |
| |
| /* send the local info, in the opposite order of the way we read it */ |
| for (i = 0; i < nt->mw_count; i++) { |
| size = nt->mw_vec[i].phys_size; |
| |
| if (max_mw_size && size > max_mw_size) |
| size = max_mw_size; |
| |
| spad = MW0_SZ_HIGH + (i * 2); |
| ntb_peer_spad_write(ndev, spad, upper_32_bits(size)); |
| |
| spad = MW0_SZ_LOW + (i * 2); |
| ntb_peer_spad_write(ndev, spad, lower_32_bits(size)); |
| } |
| |
| ntb_peer_spad_write(ndev, NUM_MWS, nt->mw_count); |
| |
| ntb_peer_spad_write(ndev, NUM_QPS, nt->qp_count); |
| |
| ntb_peer_spad_write(ndev, VERSION, NTB_TRANSPORT_VERSION); |
| |
| /* Query the remote side for its info */ |
| val = ntb_spad_read(ndev, VERSION); |
| dev_dbg(&pdev->dev, "Remote version = %d\n", val); |
| if (val != NTB_TRANSPORT_VERSION) |
| goto out; |
| |
| val = ntb_spad_read(ndev, NUM_QPS); |
| dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val); |
| if (val != nt->qp_count) |
| goto out; |
| |
| val = ntb_spad_read(ndev, NUM_MWS); |
| dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val); |
| if (val != nt->mw_count) |
| goto out; |
| |
| for (i = 0; i < nt->mw_count; i++) { |
| u64 val64; |
| |
| val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2)); |
| val64 = (u64)val << 32; |
| |
| val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2)); |
| val64 |= val; |
| |
| dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64); |
| |
| rc = ntb_set_mw(nt, i, val64); |
| if (rc) |
| goto out1; |
| } |
| |
| nt->link_is_up = true; |
| |
| for (i = 0; i < nt->qp_count; i++) { |
| struct ntb_transport_qp *qp = &nt->qp_vec[i]; |
| |
| ntb_transport_setup_qp_mw(nt, i); |
| |
| if (qp->client_ready) |
| schedule_delayed_work(&qp->link_work, 0); |
| } |
| |
| return; |
| |
| out1: |
| for (i = 0; i < nt->mw_count; i++) |
| ntb_free_mw(nt, i); |
| |
| /* if there's an actual failure, we should just bail */ |
| if (rc < 0) |
| return; |
| |
| out: |
| if (ntb_link_is_up(ndev, NULL, NULL) == 1) |
| 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 = qp->ndev->pdev; |
| struct ntb_transport_ctx *nt = qp->transport; |
| int val; |
| |
| WARN_ON(!nt->link_is_up); |
| |
| val = ntb_spad_read(nt->ndev, QP_LINKS); |
| |
| ntb_peer_spad_write(nt->ndev, QP_LINKS, val | BIT(qp->qp_num)); |
| |
| /* query remote spad for qp ready bits */ |
| ntb_peer_spad_read(nt->ndev, QP_LINKS); |
| dev_dbg_ratelimited(&pdev->dev, "Remote QP link status = %x\n", val); |
| |
| /* See if the remote side is up */ |
| if (val & BIT(qp->qp_num)) { |
| dev_info(&pdev->dev, "qp %d: Link Up\n", qp->qp_num); |
| qp->link_is_up = true; |
| qp->active = true; |
| |
| if (qp->event_handler) |
| qp->event_handler(qp->cb_data, qp->link_is_up); |
| |
| if (qp->active) |
| tasklet_schedule(&qp->rxc_db_work); |
| } else if (nt->link_is_up) |
| schedule_delayed_work(&qp->link_work, |
| msecs_to_jiffies(NTB_LINK_DOWN_TIMEOUT)); |
| } |
| |
| static int ntb_transport_init_queue(struct ntb_transport_ctx *nt, |
| unsigned int qp_num) |
| { |
| struct ntb_transport_qp *qp; |
| phys_addr_t mw_base; |
| resource_size_t mw_size; |
| unsigned int num_qps_mw, tx_size; |
| unsigned int mw_num, mw_count, qp_count; |
| u64 qp_offset; |
| |
| mw_count = nt->mw_count; |
| qp_count = nt->qp_count; |
| |
| mw_num = QP_TO_MW(nt, qp_num); |
| |
| qp = &nt->qp_vec[qp_num]; |
| qp->qp_num = qp_num; |
| qp->transport = nt; |
| qp->ndev = nt->ndev; |
| qp->client_ready = false; |
| qp->event_handler = NULL; |
| ntb_qp_link_down_reset(qp); |
| |
| if (mw_num < qp_count % mw_count) |
| num_qps_mw = qp_count / mw_count + 1; |
| else |
| num_qps_mw = qp_count / mw_count; |
| |
| mw_base = nt->mw_vec[mw_num].phys_addr; |
| mw_size = nt->mw_vec[mw_num].phys_size; |
| |
| tx_size = (unsigned int)mw_size / num_qps_mw; |
| qp_offset = tx_size * (qp_num / mw_count); |
| |
| qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset; |
| if (!qp->tx_mw) |
| return -EINVAL; |
| |
| qp->tx_mw_phys = mw_base + 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 (nt->debugfs_node_dir) { |
| char debugfs_name[4]; |
| |
| snprintf(debugfs_name, 4, "qp%d", qp_num); |
| qp->debugfs_dir = debugfs_create_dir(debugfs_name, |
| nt->debugfs_node_dir); |
| |
| qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR, |
| qp->debugfs_dir, qp, |
| &ntb_qp_debugfs_stats); |
| } else { |
| qp->debugfs_dir = NULL; |
| qp->debugfs_stats = NULL; |
| } |
| |
| 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_q_lock); |
| spin_lock_init(&qp->ntb_tx_free_q_lock); |
| |
| INIT_LIST_HEAD(&qp->rx_post_q); |
| INIT_LIST_HEAD(&qp->rx_pend_q); |
| INIT_LIST_HEAD(&qp->rx_free_q); |
| INIT_LIST_HEAD(&qp->tx_free_q); |
| |
| tasklet_init(&qp->rxc_db_work, ntb_transport_rxc_db, |
| (unsigned long)qp); |
| |
| return 0; |
| } |
| |
| static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev) |
| { |
| struct ntb_transport_ctx *nt; |
| struct ntb_transport_mw *mw; |
| unsigned int mw_count, qp_count; |
| u64 qp_bitmap; |
| int node; |
| int rc, i; |
| |
| mw_count = ntb_mw_count(ndev); |
| if (ntb_spad_count(ndev) < (NUM_MWS + 1 + mw_count * 2)) { |
| dev_err(&ndev->dev, "Not enough scratch pad registers for %s", |
| NTB_TRANSPORT_NAME); |
| return -EIO; |
| } |
| |
| if (ntb_db_is_unsafe(ndev)) |
| dev_dbg(&ndev->dev, |
| "doorbell is unsafe, proceed anyway...\n"); |
| if (ntb_spad_is_unsafe(ndev)) |
| dev_dbg(&ndev->dev, |
| "scratchpad is unsafe, proceed anyway...\n"); |
| |
| node = dev_to_node(&ndev->dev); |
| |
| nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node); |
| if (!nt) |
| return -ENOMEM; |
| |
| nt->ndev = ndev; |
| |
| nt->mw_count = mw_count; |
| |
| nt->mw_vec = kzalloc_node(mw_count * sizeof(*nt->mw_vec), |
| GFP_KERNEL, node); |
| if (!nt->mw_vec) { |
| rc = -ENOMEM; |
| goto err; |
| } |
| |
| for (i = 0; i < mw_count; i++) { |
| mw = &nt->mw_vec[i]; |
| |
| rc = ntb_mw_get_range(ndev, i, &mw->phys_addr, &mw->phys_size, |
| &mw->xlat_align, &mw->xlat_align_size); |
| if (rc) |
| goto err1; |
| |
| mw->vbase = ioremap_wc(mw->phys_addr, mw->phys_size); |
| if (!mw->vbase) { |
| rc = -ENOMEM; |
| goto err1; |
| } |
| |
| mw->buff_size = 0; |
| mw->xlat_size = 0; |
| mw->virt_addr = NULL; |
| mw->dma_addr = 0; |
| } |
| |
| qp_bitmap = ntb_db_valid_mask(ndev); |
| |
| qp_count = ilog2(qp_bitmap); |
| if (max_num_clients && max_num_clients < qp_count) |
| qp_count = max_num_clients; |
| else if (nt->mw_count < qp_count) |
| qp_count = nt->mw_count; |
| |
| qp_bitmap &= BIT_ULL(qp_count) - 1; |
| |
| nt->qp_count = qp_count; |
| nt->qp_bitmap = qp_bitmap; |
| nt->qp_bitmap_free = qp_bitmap; |
| |
| nt->qp_vec = kzalloc_node(qp_count * sizeof(*nt->qp_vec), |
| GFP_KERNEL, node); |
| if (!nt->qp_vec) { |
| rc = -ENOMEM; |
| goto err1; |
| } |
| |
| if (nt_debugfs_dir) { |
| nt->debugfs_node_dir = |
| debugfs_create_dir(pci_name(ndev->pdev), |
| nt_debugfs_dir); |
| } |
| |
| for (i = 0; i < qp_count; i++) { |
| rc = ntb_transport_init_queue(nt, i); |
| if (rc) |
| goto err2; |
| } |
| |
| INIT_DELAYED_WORK(&nt->link_work, ntb_transport_link_work); |
| INIT_WORK(&nt->link_cleanup, ntb_transport_link_cleanup_work); |
| |
| rc = ntb_set_ctx(ndev, nt, &ntb_transport_ops); |
| if (rc) |
| goto err2; |
| |
| INIT_LIST_HEAD(&nt->client_devs); |
| rc = ntb_bus_init(nt); |
| if (rc) |
| goto err3; |
| |
| nt->link_is_up = false; |
| ntb_link_enable(ndev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); |
| ntb_link_event(ndev); |
| |
| return 0; |
| |
| err3: |
| ntb_clear_ctx(ndev); |
| err2: |
| kfree(nt->qp_vec); |
| err1: |
| while (i--) { |
| mw = &nt->mw_vec[i]; |
| iounmap(mw->vbase); |
| } |
| kfree(nt->mw_vec); |
| err: |
| kfree(nt); |
| return rc; |
| } |
| |
| static void ntb_transport_free(struct ntb_client *self, struct ntb_dev *ndev) |
| { |
| struct ntb_transport_ctx *nt = ndev->ctx; |
| struct ntb_transport_qp *qp; |
| u64 qp_bitmap_alloc; |
| int i; |
| |
| ntb_transport_link_cleanup(nt); |
| cancel_work_sync(&nt->link_cleanup); |
| cancel_delayed_work_sync(&nt->link_work); |
| |
| qp_bitmap_alloc = nt->qp_bitmap & ~nt->qp_bitmap_free; |
| |
| /* verify that all the qp's are freed */ |
| for (i = 0; i < nt->qp_count; i++) { |
| qp = &nt->qp_vec[i]; |
| if (qp_bitmap_alloc & BIT_ULL(i)) |
| ntb_transport_free_queue(qp); |
| debugfs_remove_recursive(qp->debugfs_dir); |
| } |
| |
| ntb_link_disable(ndev); |
| ntb_clear_ctx(ndev); |
| |
| ntb_bus_remove(nt); |
| |
| for (i = nt->mw_count; i--; ) { |
| ntb_free_mw(nt, i); |
| iounmap(nt->mw_vec[i].vbase); |
| } |
| |
| kfree(nt->qp_vec); |
| kfree(nt->mw_vec); |
| kfree(nt); |
| } |
| |
| static void ntb_complete_rxc(struct ntb_transport_qp *qp) |
| { |
| struct ntb_queue_entry *entry; |
| void *cb_data; |
| unsigned int len; |
| unsigned long irqflags; |
| |
| spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); |
| |
| while (!list_empty(&qp->rx_post_q)) { |
| entry = list_first_entry(&qp->rx_post_q, |
| struct ntb_queue_entry, entry); |
| if (!(entry->flags & DESC_DONE_FLAG)) |
| break; |
| |
| entry->rx_hdr->flags = 0; |
| iowrite32(entry->rx_index, &qp->rx_info->entry); |
| |
| cb_data = entry->cb_data; |
| len = entry->len; |
| |
| list_move_tail(&entry->entry, &qp->rx_free_q); |
| |
| spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); |
| |
| if (qp->rx_handler && qp->client_ready) |
| qp->rx_handler(qp, qp->cb_data, cb_data, len); |
| |
| spin_lock_irqsave(&qp->ntb_rx_q_lock, irqflags); |
| } |
| |
| spin_unlock_irqrestore(&qp->ntb_rx_q_lock, irqflags); |
| } |
| |
| static void ntb_rx_copy_callback(void *data, |
| const struct dmaengine_result *res) |
| { |
| struct ntb_queue_entry *entry = data; |
| |
| /* we need to check DMA results if we are using DMA */ |
| if (res) { |
| enum dmaengine_tx_result dma_err = res->result; |
| |
| switch (dma_err) { |
| case DMA_TRANS_READ_FAILED: |
| case DMA_TRANS_WRITE_FAILED: |
| entry->errors++; |
| case DMA_TRANS_ABORTED: |
| { |
| struct ntb_transport_qp *qp = entry->qp; |
| void *offset = qp->rx_buff + qp->rx_max_frame * |
| qp->rx_index; |
| |
| ntb_memcpy_rx(entry, offset); |
| qp->rx_memcpy++; |
| return; |
| } |
| |
| case DMA_TRANS_NOERROR: |
| default: |
| break; |
| } |
| } |
| |
| entry->flags |= DESC_DONE_FLAG; |
| |
| ntb_complete_rxc(entry->qp); |
| } |
| |
| static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset) |
| { |
| void *buf = entry->buf; |
| size_t len = entry->len; |
| |
| memcpy(buf, offset, len); |
| |
| /* Ensure that the data is fully copied out before clearing the flag */ |
| wmb(); |
| |
| ntb_rx_copy_callback(entry, NULL); |
| } |
| |
| static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset) |
| { |
| struct dma_async_tx_descriptor *txd; |
| struct ntb_transport_qp *qp = entry->qp; |
| struct dma_chan *chan = qp->rx_dma_chan; |
| struct dma_device *device; |
| size_t pay_off, buff_off, len; |
| struct dmaengine_unmap_data *unmap; |
| dma_cookie_t cookie; |
| void *buf = entry->buf; |
| |
| len = entry->len; |
| device = chan->device; |
| pay_off = (size_t)offset & ~PAGE_MASK; |
| buff_off = (size_t)buf & ~PAGE_MASK; |
| |
| if (!is_dma_copy_aligned(device, pay_off, buff_off, len)) |
| goto err; |
| |
| unmap = dmaengine_get_unmap_data(device->dev, 2, GFP_NOWAIT); |
| if (!unmap) |
| goto err; |
| |
| unmap->len = len; |
| unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset), |
| pay_off, len, DMA_TO_DEVICE); |
| if (dma_mapping_error(device->dev, unmap->addr[0])) |
| goto err_get_unmap; |
| |
| unmap->to_cnt = 1; |
| |
| unmap->addr[1] = dma_map_page(device->dev, virt_to_page(buf), |
| buff_off, len, DMA_FROM_DEVICE); |
| if (dma_mapping_error(device->dev, unmap->addr[1])) |
| goto err_get_unmap; |
| |
| unmap->from_cnt = 1; |
| |
| txd = device->device_prep_dma_memcpy(chan, unmap->addr[1], |
| unmap->addr[0], len, |
| DMA_PREP_INTERRUPT); |
| if (!txd) |
| goto err_get_unmap; |
| |
| txd->callback_result = ntb_rx_copy_callback; |
| txd->callback_param = entry; |
| dma_set_unmap(txd, unmap); |
| |
| cookie = dmaengine_submit(txd); |
| if (dma_submit_error(cookie)) |
| goto err_set_unmap; |
| |
| dmaengine_unmap_put(unmap); |
| |
| qp->last_cookie = cookie; |
| |
| qp->rx_async++; |
| |
| return 0; |
| |
| err_set_unmap: |
| dmaengine_unmap_put(unmap); |
| err_get_unmap: |
| dmaengine_unmap_put(unmap); |
| err: |
| return -ENXIO; |
| } |
| |
| static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset) |
| { |
| struct ntb_transport_qp *qp = entry->qp; |
| struct dma_chan *chan = qp->rx_dma_chan; |
| int res; |
| |
| if (!chan) |
| goto err; |
| |
| if (entry->len < copy_bytes) |
| goto err; |
| |
| res = ntb_async_rx_submit(entry, offset); |
| if (res < 0) |
| goto err; |
| |
| if (!entry->retries) |
| qp->rx_async++; |
| |
| return; |
| |
| err: |
| ntb_memcpy_rx(entry, offset); |
| qp->rx_memcpy++; |
| } |
| |
| 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); |
| |
| dev_dbg(&qp->ndev->pdev->dev, "qp %d: RX ver %u len %d flags %x\n", |
| qp->qp_num, hdr->ver, hdr->len, hdr->flags); |
| |
| if (!(hdr->flags & DESC_DONE_FLAG)) { |
| dev_dbg(&qp->ndev->pdev->dev, "done flag not set\n"); |
| qp->rx_ring_empty++; |
| return -EAGAIN; |
| } |
| |
| if (hdr->flags & LINK_DOWN_FLAG) { |
| dev_dbg(&qp->ndev->pdev->dev, "link down flag set\n"); |
| ntb_qp_link_down(qp); |
| hdr->flags = 0; |
| return -EAGAIN; |
| } |
| |
| if (hdr->ver != (u32)qp->rx_pkts) { |
| dev_dbg(&qp->ndev->pdev->dev, |
| "version mismatch, expected %llu - got %u\n", |
| qp->rx_pkts, hdr->ver); |
| qp->rx_err_ver++; |
| return -EIO; |
| } |
| |
| entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q); |
| if (!entry) { |
| dev_dbg(&qp->ndev->pdev->dev, "no receive buffer\n"); |
| qp->rx_err_no_buf++; |
| return -EAGAIN; |
| } |
| |
| entry->rx_hdr = hdr; |
| entry->rx_index = qp->rx_index; |
| |
| if (hdr->len > entry->len) { |
| dev_dbg(&qp->ndev->pdev->dev, |
| "receive buffer overflow! Wanted %d got %d\n", |
| hdr->len, entry->len); |
| qp->rx_err_oflow++; |
| |
| entry->len = -EIO; |
| entry->flags |= DESC_DONE_FLAG; |
| |
| ntb_complete_rxc(qp); |
| } else { |
| dev_dbg(&qp->ndev->pdev->dev, |
| "RX OK index %u ver %u size %d into buf size %d\n", |
| qp->rx_index, hdr->ver, hdr->len, entry->len); |
| |
| qp->rx_bytes += hdr->len; |
| qp->rx_pkts++; |
| |
| entry->len = hdr->len; |
| |
| ntb_async_rx(entry, offset); |
| } |
| |
| qp->rx_index++; |
| qp->rx_index %= qp->rx_max_entry; |
| |
| return 0; |
| } |
| |
| static void ntb_transport_rxc_db(unsigned long data) |
| { |
| struct ntb_transport_qp *qp = (void *)data; |
| int rc, i; |
| |
| dev_dbg(&qp->ndev->pdev->dev, "%s: doorbell %d received\n", |
| __func__, qp->qp_num); |
| |
| /* 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; |
| } |
| |
| if (i && qp->rx_dma_chan) |
| dma_async_issue_pending(qp->rx_dma_chan); |
| |
| if (i == qp->rx_max_entry) { |
| /* there is more work to do */ |
| if (qp->active) |
| tasklet_schedule(&qp->rxc_db_work); |
| } else if (ntb_db_read(qp->ndev) & BIT_ULL(qp->qp_num)) { |
| /* the doorbell bit is set: clear it */ |
| ntb_db_clear(qp->ndev, BIT_ULL(qp->qp_num)); |
| /* ntb_db_read ensures ntb_db_clear write is committed */ |
| ntb_db_read(qp->ndev); |
| |
| /* an interrupt may have arrived between finishing |
| * ntb_process_rxc and clearing the doorbell bit: |
| * there might be some more work to do. |
| */ |
| if (qp->active) |
| tasklet_schedule(&qp->rxc_db_work); |
| } |
| } |
| |
| static void ntb_tx_copy_callback(void *data, |
| const struct dmaengine_result *res) |
| { |
| struct ntb_queue_entry *entry = data; |
| struct ntb_transport_qp *qp = entry->qp; |
| struct ntb_payload_header __iomem *hdr = entry->tx_hdr; |
| |
| /* we need to check DMA results if we are using DMA */ |
| if (res) { |
| enum dmaengine_tx_result dma_err = res->result; |
| |
| switch (dma_err) { |
| case DMA_TRANS_READ_FAILED: |
| case DMA_TRANS_WRITE_FAILED: |
| entry->errors++; |
| case DMA_TRANS_ABORTED: |
| { |
| void __iomem *offset = |
| qp->tx_mw + qp->tx_max_frame * |
| entry->tx_index; |
| |
| /* resubmit via CPU */ |
| ntb_memcpy_tx(entry, offset); |
| qp->tx_memcpy++; |
| return; |
| } |
| |
| case DMA_TRANS_NOERROR: |
| default: |
| break; |
| } |
| } |
| |
| iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags); |
| |
| ntb_peer_db_set(qp->ndev, BIT_ULL(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 void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset) |
| { |
| #ifdef ARCH_HAS_NOCACHE_UACCESS |
| /* |
| * Using non-temporal mov to improve performance on non-cached |
| * writes, even though we aren't actually copying from user space. |
| */ |
| __copy_from_user_inatomic_nocache(offset, entry->buf, entry->len); |
| #else |
| memcpy_toio(offset, entry->buf, entry->len); |
| #endif |
| |
| /* Ensure that the data is fully copied out before setting the flags */ |
| wmb(); |
| |
| ntb_tx_copy_callback(entry, NULL); |
| } |
| |
| static int ntb_async_tx_submit(struct ntb_transport_qp *qp, |
| struct ntb_queue_entry *entry) |
| { |
| struct dma_async_tx_descriptor *txd; |
| struct dma_chan *chan = qp->tx_dma_chan; |
| struct dma_device *device; |
| size_t len = entry->len; |
| void *buf = entry->buf; |
| size_t dest_off, buff_off; |
| struct dmaengine_unmap_data *unmap; |
| dma_addr_t dest; |
| dma_cookie_t cookie; |
| |
| device = chan->device; |
| dest = qp->tx_mw_phys + qp->tx_max_frame * entry->tx_index; |
| buff_off = (size_t)buf & ~PAGE_MASK; |
| dest_off = (size_t)dest & ~PAGE_MASK; |
| |
| if (!is_dma_copy_aligned(device, buff_off, dest_off, len)) |
| goto err; |
| |
| unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); |
| if (!unmap) |
| goto err; |
| |
| unmap->len = len; |
| unmap->addr[0] = dma_map_page(device->dev, virt_to_page(buf), |
| buff_off, len, DMA_TO_DEVICE); |
| if (dma_mapping_error(device->dev, unmap->addr[0])) |
| goto err_get_unmap; |
| |
| unmap->to_cnt = 1; |
| |
| txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0], len, |
| DMA_PREP_INTERRUPT); |
| if (!txd) |
| goto err_get_unmap; |
| |
| txd->callback_result = ntb_tx_copy_callback; |
| txd->callback_param = entry; |
| dma_set_unmap(txd, unmap); |
| |
| cookie = dmaengine_submit(txd); |
| if (dma_submit_error(cookie)) |
| goto err_set_unmap; |
| |
| dmaengine_unmap_put(unmap); |
| |
| dma_async_issue_pending(chan); |
| |
| return 0; |
| err_set_unmap: |
| dmaengine_unmap_put(unmap); |
| err_get_unmap: |
| dmaengine_unmap_put(unmap); |
| err: |
| return -ENXIO; |
| } |
| |
| static void ntb_async_tx(struct ntb_transport_qp *qp, |
| struct ntb_queue_entry *entry) |
| { |
| struct ntb_payload_header __iomem *hdr; |
| struct dma_chan *chan = qp->tx_dma_chan; |
| void __iomem *offset; |
| int res; |
| |
| entry->tx_index = qp->tx_index; |
| offset = qp->tx_mw + qp->tx_max_frame * entry->tx_index; |
| hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header); |
| entry->tx_hdr = hdr; |
| |
| iowrite32(entry->len, &hdr->len); |
| iowrite32((u32)qp->tx_pkts, &hdr->ver); |
| |
| if (!chan) |
| goto err; |
| |
| if (entry->len < copy_bytes) |
| goto err; |
| |
| res = ntb_async_tx_submit(qp, entry); |
| if (res < 0) |
| goto err; |
| |
| if (!entry->retries) |
| qp->tx_async++; |
| |
| return; |
| |
| err: |
| ntb_memcpy_tx(entry, offset); |
| qp->tx_memcpy++; |
| } |
| |
| static int ntb_process_tx(struct ntb_transport_qp *qp, |
| struct ntb_queue_entry *entry) |
| { |
| 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, qp->cb_data, NULL, -EIO); |
| |
| ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
| &qp->tx_free_q); |
| return 0; |
| } |
| |
| ntb_async_tx(qp, entry); |
| |
| 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 = qp->ndev->pdev; |
| struct ntb_queue_entry *entry; |
| int i, rc; |
| |
| if (!qp->link_is_up) |
| return; |
| |
| dev_info(&pdev->dev, "qp %d: Send 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_qp_link_down_reset(qp); |
| } |
| |
| static bool ntb_dma_filter_fn(struct dma_chan *chan, void *node) |
| { |
| return dev_to_node(&chan->dev->device) == (int)(unsigned long)node; |
| } |
| |
| /** |
| * 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 device *client_dev, |
| const struct ntb_queue_handlers *handlers) |
| { |
| struct ntb_dev *ndev; |
| struct pci_dev *pdev; |
| struct ntb_transport_ctx *nt; |
| struct ntb_queue_entry *entry; |
| struct ntb_transport_qp *qp; |
| u64 qp_bit; |
| unsigned int free_queue; |
| dma_cap_mask_t dma_mask; |
| int node; |
| int i; |
| |
| ndev = dev_ntb(client_dev->parent); |
| pdev = ndev->pdev; |
| nt = ndev->ctx; |
| |
| node = dev_to_node(&ndev->dev); |
| |
| free_queue = ffs(nt->qp_bitmap_free); |
| if (!free_queue) |
| goto err; |
| |
| /* decrement free_queue to make it zero based */ |
| free_queue--; |
| |
| qp = &nt->qp_vec[free_queue]; |
| qp_bit = BIT_ULL(qp->qp_num); |
| |
| nt->qp_bitmap_free &= ~qp_bit; |
| |
| qp->cb_data = data; |
| qp->rx_handler = handlers->rx_handler; |
| qp->tx_handler = handlers->tx_handler; |
| qp->event_handler = handlers->event_handler; |
| |
| dma_cap_zero(dma_mask); |
| dma_cap_set(DMA_MEMCPY, dma_mask); |
| |
| if (use_dma) { |
| qp->tx_dma_chan = |
| dma_request_channel(dma_mask, ntb_dma_filter_fn, |
| (void *)(unsigned long)node); |
| if (!qp->tx_dma_chan) |
| dev_info(&pdev->dev, "Unable to allocate TX DMA channel\n"); |
| |
| qp->rx_dma_chan = |
| dma_request_channel(dma_mask, ntb_dma_filter_fn, |
| (void *)(unsigned long)node); |
| if (!qp->rx_dma_chan) |
| dev_info(&pdev->dev, "Unable to allocate RX DMA channel\n"); |
| } else { |
| qp->tx_dma_chan = NULL; |
| qp->rx_dma_chan = NULL; |
| } |
| |
| dev_dbg(&pdev->dev, "Using %s memcpy for TX\n", |
| qp->tx_dma_chan ? "DMA" : "CPU"); |
| |
| dev_dbg(&pdev->dev, "Using %s memcpy for RX\n", |
| qp->rx_dma_chan ? "DMA" : "CPU"); |
| |
| for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { |
| entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
| if (!entry) |
| goto err1; |
| |
| entry->qp = qp; |
| ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, |
| &qp->rx_free_q); |
| } |
| qp->rx_alloc_entry = NTB_QP_DEF_NUM_ENTRIES; |
| |
| for (i = 0; i < qp->tx_max_entry; i++) { |
| entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); |
| if (!entry) |
| goto err2; |
| |
| entry->qp = qp; |
| ntb_list_add(&qp->ntb_tx_free_q_lock, &entry->entry, |
| &qp->tx_free_q); |
| } |
| |
| ntb_db_clear(qp->ndev, qp_bit); |
| ntb_db_clear_mask(qp->ndev, qp_bit); |
| |
| dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num); |
| |
| return qp; |
| |
| err2: |
| while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
| kfree(entry); |
| err1: |
| qp->rx_alloc_entry = 0; |
| while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
| kfree(entry); |
| if (qp->tx_dma_chan) |
| dma_release_channel(qp->tx_dma_chan); |
| if (qp->rx_dma_chan) |
| dma_release_channel(qp->rx_dma_chan); |
| nt->qp_bitmap_free |= qp_bit; |
| 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; |
| u64 qp_bit; |
| |
| if (!qp) |
| return; |
| |
| pdev = qp->ndev->pdev; |
| |
| qp->active = false; |
| |
| if (qp->tx_dma_chan) { |
| struct dma_chan *chan = qp->tx_dma_chan; |
| /* Putting the dma_chan to NULL will force any new traffic to be |
| * processed by the CPU instead of the DAM engine |
| */ |
| qp->tx_dma_chan = NULL; |
| |
| /* Try to be nice and wait for any queued DMA engine |
| * transactions to process before smashing it with a rock |
| */ |
| dma_sync_wait(chan, qp->last_cookie); |
| dmaengine_terminate_all(chan); |
| dma_release_channel(chan); |
| } |
| |
| if (qp->rx_dma_chan) { |
| struct dma_chan *chan = qp->rx_dma_chan; |
| /* Putting the dma_chan to NULL will force any new traffic to be |
| * processed by the CPU instead of the DAM engine |
| */ |
| qp->rx_dma_chan = NULL; |
| |
| /* Try to be nice and wait for any queued DMA engine |
| * transactions to process before smashing it with a rock |
| */ |
| dma_sync_wait(chan, qp->last_cookie); |
| dmaengine_terminate_all(chan); |
| dma_release_channel(chan); |
| } |
| |
| qp_bit = BIT_ULL(qp->qp_num); |
| |
| ntb_db_set_mask(qp->ndev, qp_bit); |
| tasklet_kill(&qp->rxc_db_work); |
| |
| cancel_delayed_work_sync(&qp->link_work); |
| |
| qp->cb_data = NULL; |
| qp->rx_handler = NULL; |
| qp->tx_handler = NULL; |
| qp->event_handler = NULL; |
| |
| while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) |
| kfree(entry); |
| |
| while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q))) { |
| dev_warn(&pdev->dev, "Freeing item from non-empty rx_pend_q\n"); |
| kfree(entry); |
| } |
| |
| while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q))) { |
| dev_warn(&pdev->dev, "Freeing item from non-empty rx_post_q\n"); |
| kfree(entry); |
| } |
| |
| while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) |
| kfree(entry); |
| |
| qp->transport->qp_bitmap_free |= qp_bit; |
| |
| 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) |
| return NULL; |
| |
| entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q); |
| if (!entry) |
| return NULL; |
| |
| buf = entry->cb_data; |
| *len = entry->len; |
| |
| ntb_list_add(&qp->ntb_rx_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_q_lock, &qp->rx_free_q); |
| if (!entry) |
| return -ENOMEM; |
| |
| entry->cb_data = cb; |
| entry->buf = data; |
| entry->len = len; |
| entry->flags = 0; |
| entry->retries = 0; |
| entry->errors = 0; |
| entry->rx_index = 0; |
| |
| ntb_list_add(&qp->ntb_rx_q_lock, &entry->entry, &qp->rx_pend_q); |
| |
| if (qp->active) |
| tasklet_schedule(&qp->rxc_db_work); |
| |
| 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 being 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->link_is_up || !len) |
| return -EINVAL; |
| |
| entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); |
| if (!entry) { |
| qp->tx_err_no_buf++; |
| return -EBUSY; |
| } |
| |
| entry->cb_data = cb; |
| entry->buf = data; |
| entry->len = len; |
| entry->flags = 0; |
| entry->errors = 0; |
| entry->retries = 0; |
| entry->tx_index = 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 = true; |
| |
| if (qp->transport->link_is_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 appropriately. |
| */ |
| void ntb_transport_link_down(struct ntb_transport_qp *qp) |
| { |
| int val; |
| |
| if (!qp) |
| return; |
| |
| qp->client_ready = false; |
| |
| val = ntb_spad_read(qp->ndev, QP_LINKS); |
| |
| ntb_peer_spad_write(qp->ndev, QP_LINKS, |
| val & ~BIT(qp->qp_num)); |
| |
| if (qp->link_is_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->link_is_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) |
| { |
| unsigned int max_size; |
| unsigned int copy_align; |
| struct dma_chan *rx_chan, *tx_chan; |
| |
| if (!qp) |
| return 0; |
| |
| rx_chan = qp->rx_dma_chan; |
| tx_chan = qp->tx_dma_chan; |
| |
| copy_align = max(rx_chan ? rx_chan->device->copy_align : 0, |
| tx_chan ? tx_chan->device->copy_align : 0); |
| |
| /* If DMA engine usage is possible, try to find the max size for that */ |
| max_size = qp->tx_max_frame - sizeof(struct ntb_payload_header); |
| max_size = round_down(max_size, 1 << copy_align); |
| |
| return max_size; |
| } |
| EXPORT_SYMBOL_GPL(ntb_transport_max_size); |
| |
| unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp) |
| { |
| unsigned int head = qp->tx_index; |
| unsigned int tail = qp->remote_rx_info->entry; |
| |
| return tail > head ? tail - head : qp->tx_max_entry + tail - head; |
| } |
| EXPORT_SYMBOL_GPL(ntb_transport_tx_free_entry); |
| |
| static void ntb_transport_doorbell_callback(void *data, int vector) |
| { |
| struct ntb_transport_ctx *nt = data; |
| struct ntb_transport_qp *qp; |
| u64 db_bits; |
| unsigned int qp_num; |
| |
| db_bits = (nt->qp_bitmap & ~nt->qp_bitmap_free & |
| ntb_db_vector_mask(nt->ndev, vector)); |
| |
| while (db_bits) { |
| qp_num = __ffs(db_bits); |
| qp = &nt->qp_vec[qp_num]; |
| |
| if (qp->active) |
| tasklet_schedule(&qp->rxc_db_work); |
| |
| db_bits &= ~BIT_ULL(qp_num); |
| } |
| } |
| |
| static const struct ntb_ctx_ops ntb_transport_ops = { |
| .link_event = ntb_transport_event_callback, |
| .db_event = ntb_transport_doorbell_callback, |
| }; |
| |
| static struct ntb_client ntb_transport_client = { |
| .ops = { |
| .probe = ntb_transport_probe, |
| .remove = ntb_transport_free, |
| }, |
| }; |
| |
| static int __init ntb_transport_init(void) |
| { |
| int rc; |
| |
| pr_info("%s, version %s\n", NTB_TRANSPORT_DESC, NTB_TRANSPORT_VER); |
| |
| if (debugfs_initialized()) |
| nt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); |
| |
| rc = bus_register(&ntb_transport_bus); |
| if (rc) |
| goto err_bus; |
| |
| rc = ntb_register_client(&ntb_transport_client); |
| if (rc) |
| goto err_client; |
| |
| return 0; |
| |
| err_client: |
| bus_unregister(&ntb_transport_bus); |
| err_bus: |
| debugfs_remove_recursive(nt_debugfs_dir); |
| return rc; |
| } |
| module_init(ntb_transport_init); |
| |
| static void __exit ntb_transport_exit(void) |
| { |
| ntb_unregister_client(&ntb_transport_client); |
| bus_unregister(&ntb_transport_bus); |
| debugfs_remove_recursive(nt_debugfs_dir); |
| } |
| module_exit(ntb_transport_exit); |