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Variable rc is initialized to a value that is never read and it is re-assigned later. The initialization is redundant and can be removed. Addresses-Coverity: ("Unused value") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>
2499 lines
61 KiB
C
2499 lines
61 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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* Copyright (C) 2015 EMC 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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* Copyright (C) 2015 EMC 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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* PCIe NTB Transport 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/dmaengine.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/uaccess.h>
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#include "linux/ntb.h"
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#include "linux/ntb_transport.h"
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#define NTB_TRANSPORT_VERSION 4
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#define NTB_TRANSPORT_VER "4"
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#define NTB_TRANSPORT_NAME "ntb_transport"
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#define NTB_TRANSPORT_DESC "Software Queue-Pair Transport over NTB"
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#define NTB_TRANSPORT_MIN_SPADS (MW0_SZ_HIGH + 2)
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MODULE_DESCRIPTION(NTB_TRANSPORT_DESC);
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MODULE_VERSION(NTB_TRANSPORT_VER);
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_AUTHOR("Intel Corporation");
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static unsigned long max_mw_size;
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module_param(max_mw_size, ulong, 0644);
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MODULE_PARM_DESC(max_mw_size, "Limit size of large memory windows");
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static unsigned int transport_mtu = 0x10000;
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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;
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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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static unsigned int copy_bytes = 1024;
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module_param(copy_bytes, uint, 0644);
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MODULE_PARM_DESC(copy_bytes, "Threshold under which NTB will use the CPU to copy instead of DMA");
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static bool use_dma;
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module_param(use_dma, bool, 0644);
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MODULE_PARM_DESC(use_dma, "Use DMA engine to perform large data copy");
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static bool use_msi;
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#ifdef CONFIG_NTB_MSI
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module_param(use_msi, bool, 0644);
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MODULE_PARM_DESC(use_msi, "Use MSI interrupts instead of doorbells");
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#endif
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static struct dentry *nt_debugfs_dir;
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/* Only two-ports NTB devices are supported */
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#define PIDX NTB_DEF_PEER_IDX
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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 transferred */
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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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int retries;
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int errors;
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unsigned int tx_index;
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unsigned int rx_index;
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struct ntb_transport_qp *qp;
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union {
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struct ntb_payload_header __iomem *tx_hdr;
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struct ntb_payload_header *rx_hdr;
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};
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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_ctx *transport;
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struct ntb_dev *ndev;
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void *cb_data;
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struct dma_chan *tx_dma_chan;
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struct dma_chan *rx_dma_chan;
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bool client_ready;
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bool link_is_up;
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bool active;
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u8 qp_num; /* Only 64 QP's are allowed. 0-63 */
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u64 qp_bit;
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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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phys_addr_t tx_mw_phys;
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size_t tx_mw_size;
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dma_addr_t tx_mw_dma_addr;
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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 list_head rx_post_q;
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struct list_head rx_pend_q;
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struct list_head rx_free_q;
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/* ntb_rx_q_lock: synchronize access to rx_XXXX_q */
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spinlock_t ntb_rx_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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unsigned int rx_alloc_entry;
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dma_cookie_t last_cookie;
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struct tasklet_struct rxc_db_work;
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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 rx_memcpy;
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u64 rx_async;
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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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u64 tx_err_no_buf;
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u64 tx_memcpy;
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u64 tx_async;
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bool use_msi;
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int msi_irq;
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struct ntb_msi_desc msi_desc;
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struct ntb_msi_desc peer_msi_desc;
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};
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struct ntb_transport_mw {
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phys_addr_t phys_addr;
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resource_size_t phys_size;
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void __iomem *vbase;
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size_t xlat_size;
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size_t buff_size;
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size_t alloc_size;
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void *alloc_addr;
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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 ntb_transport_ctx *nt;
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struct device dev;
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};
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struct ntb_transport_ctx {
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struct list_head entry;
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struct list_head client_devs;
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struct ntb_dev *ndev;
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struct ntb_transport_mw *mw_vec;
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struct ntb_transport_qp *qp_vec;
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unsigned int mw_count;
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unsigned int qp_count;
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u64 qp_bitmap;
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u64 qp_bitmap_free;
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bool use_msi;
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unsigned int msi_spad_offset;
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u64 msi_db_mask;
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bool link_is_up;
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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_node_dir;
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};
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enum {
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DESC_DONE_FLAG = BIT(0),
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LINK_DOWN_FLAG = BIT(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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};
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#define dev_client_dev(__dev) \
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container_of((__dev), struct ntb_transport_client_dev, dev)
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#define drv_client(__drv) \
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container_of((__drv), struct ntb_transport_client, driver)
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#define QP_TO_MW(nt, qp) ((qp) % nt->mw_count)
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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 void ntb_transport_rxc_db(unsigned long data);
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static const struct ntb_ctx_ops ntb_transport_ops;
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static struct ntb_client ntb_transport_client;
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static int ntb_async_tx_submit(struct ntb_transport_qp *qp,
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struct ntb_queue_entry *entry);
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static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset);
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static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset);
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static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset);
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static int ntb_transport_bus_match(struct device *dev,
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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_transport_bus_probe(struct device *dev)
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{
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const struct ntb_transport_client *client;
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int rc;
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get_device(dev);
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client = drv_client(dev->driver);
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rc = client->probe(dev);
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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_transport_bus_remove(struct device *dev)
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{
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const struct ntb_transport_client *client;
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client = drv_client(dev->driver);
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client->remove(dev);
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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_transport_bus = {
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.name = "ntb_transport",
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.match = ntb_transport_bus_match,
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.probe = ntb_transport_bus_probe,
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.remove = ntb_transport_bus_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_ctx *nt)
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{
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list_add_tail(&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_ctx *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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}
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static void ntb_transport_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 = dev_client_dev(dev);
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kfree(client_dev);
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}
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/**
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* ntb_transport_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_transport_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_ctx *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_transport_unregister_client_dev);
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/**
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* ntb_transport_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_transport_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_ctx *nt;
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int node;
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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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node = dev_to_node(&nt->ndev->dev);
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client_dev = kzalloc_node(sizeof(*client_dev),
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GFP_KERNEL, node);
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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_transport_bus;
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dev->release = ntb_transport_client_release;
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dev->parent = &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_transport_unregister_client_dev(device_name);
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return rc;
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}
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EXPORT_SYMBOL_GPL(ntb_transport_register_client_dev);
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/**
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* ntb_transport_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_transport_register_client(struct ntb_transport_client *drv)
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{
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drv->driver.bus = &ntb_transport_bus;
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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_transport_register_client);
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/**
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* ntb_transport_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_transport_unregister_client(struct ntb_transport_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_transport_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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qp = filp->private_data;
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if (!qp || !qp->link_is_up)
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return 0;
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out_count = 1000;
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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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out_offset = 0;
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"\nNTB QP stats:\n\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_memcpy - \t%llu\n", qp->rx_memcpy);
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out_offset += snprintf(buf + out_offset, out_count - out_offset,
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"rx_async - \t%llu\n", qp->rx_async);
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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,
|
|
"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_KERNEL, 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 irqreturn_t ntb_transport_isr(int irq, void *dev)
|
|
{
|
|
struct ntb_transport_qp *qp = dev;
|
|
|
|
tasklet_schedule(&qp->rxc_db_work);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void ntb_transport_setup_qp_peer_msi(struct ntb_transport_ctx *nt,
|
|
unsigned int qp_num)
|
|
{
|
|
struct ntb_transport_qp *qp = &nt->qp_vec[qp_num];
|
|
int spad = qp_num * 2 + nt->msi_spad_offset;
|
|
|
|
if (!nt->use_msi)
|
|
return;
|
|
|
|
if (spad >= ntb_spad_count(nt->ndev))
|
|
return;
|
|
|
|
qp->peer_msi_desc.addr_offset =
|
|
ntb_peer_spad_read(qp->ndev, PIDX, spad);
|
|
qp->peer_msi_desc.data =
|
|
ntb_peer_spad_read(qp->ndev, PIDX, spad + 1);
|
|
|
|
dev_dbg(&qp->ndev->pdev->dev, "QP%d Peer MSI addr=%x data=%x\n",
|
|
qp_num, qp->peer_msi_desc.addr_offset, qp->peer_msi_desc.data);
|
|
|
|
if (qp->peer_msi_desc.addr_offset) {
|
|
qp->use_msi = true;
|
|
dev_info(&qp->ndev->pdev->dev,
|
|
"Using MSI interrupts for QP%d\n", qp_num);
|
|
}
|
|
}
|
|
|
|
static void ntb_transport_setup_qp_msi(struct ntb_transport_ctx *nt,
|
|
unsigned int qp_num)
|
|
{
|
|
struct ntb_transport_qp *qp = &nt->qp_vec[qp_num];
|
|
int spad = qp_num * 2 + nt->msi_spad_offset;
|
|
int rc;
|
|
|
|
if (!nt->use_msi)
|
|
return;
|
|
|
|
if (spad >= ntb_spad_count(nt->ndev)) {
|
|
dev_warn_once(&qp->ndev->pdev->dev,
|
|
"Not enough SPADS to use MSI interrupts\n");
|
|
return;
|
|
}
|
|
|
|
ntb_spad_write(qp->ndev, spad, 0);
|
|
ntb_spad_write(qp->ndev, spad + 1, 0);
|
|
|
|
if (!qp->msi_irq) {
|
|
qp->msi_irq = ntbm_msi_request_irq(qp->ndev, ntb_transport_isr,
|
|
KBUILD_MODNAME, qp,
|
|
&qp->msi_desc);
|
|
if (qp->msi_irq < 0) {
|
|
dev_warn(&qp->ndev->pdev->dev,
|
|
"Unable to allocate MSI interrupt for qp%d\n",
|
|
qp_num);
|
|
return;
|
|
}
|
|
}
|
|
|
|
rc = ntb_spad_write(qp->ndev, spad, qp->msi_desc.addr_offset);
|
|
if (rc)
|
|
goto err_free_interrupt;
|
|
|
|
rc = ntb_spad_write(qp->ndev, spad + 1, qp->msi_desc.data);
|
|
if (rc)
|
|
goto err_free_interrupt;
|
|
|
|
dev_dbg(&qp->ndev->pdev->dev, "QP%d MSI %d addr=%x data=%x\n",
|
|
qp_num, qp->msi_irq, qp->msi_desc.addr_offset,
|
|
qp->msi_desc.data);
|
|
|
|
return;
|
|
|
|
err_free_interrupt:
|
|
devm_free_irq(&nt->ndev->dev, qp->msi_irq, qp);
|
|
}
|
|
|
|
static void ntb_transport_msi_peer_desc_changed(struct ntb_transport_ctx *nt)
|
|
{
|
|
int i;
|
|
|
|
dev_dbg(&nt->ndev->pdev->dev, "Peer MSI descriptors changed");
|
|
|
|
for (i = 0; i < nt->qp_count; i++)
|
|
ntb_transport_setup_qp_peer_msi(nt, i);
|
|
}
|
|
|
|
static void ntb_transport_msi_desc_changed(void *data)
|
|
{
|
|
struct ntb_transport_ctx *nt = data;
|
|
int i;
|
|
|
|
dev_dbg(&nt->ndev->pdev->dev, "MSI descriptors changed");
|
|
|
|
for (i = 0; i < nt->qp_count; i++)
|
|
ntb_transport_setup_qp_msi(nt, i);
|
|
|
|
ntb_peer_db_set(nt->ndev, nt->msi_db_mask);
|
|
}
|
|
|
|
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, PIDX, num_mw);
|
|
dma_free_coherent(&pdev->dev, mw->alloc_size,
|
|
mw->alloc_addr, mw->dma_addr);
|
|
mw->xlat_size = 0;
|
|
mw->buff_size = 0;
|
|
mw->alloc_size = 0;
|
|
mw->alloc_addr = NULL;
|
|
mw->virt_addr = NULL;
|
|
}
|
|
|
|
static int ntb_alloc_mw_buffer(struct ntb_transport_mw *mw,
|
|
struct device *dma_dev, size_t align)
|
|
{
|
|
dma_addr_t dma_addr;
|
|
void *alloc_addr, *virt_addr;
|
|
int rc;
|
|
|
|
alloc_addr = dma_alloc_coherent(dma_dev, mw->alloc_size,
|
|
&dma_addr, GFP_KERNEL);
|
|
if (!alloc_addr) {
|
|
dev_err(dma_dev, "Unable to alloc MW buff of size %zu\n",
|
|
mw->alloc_size);
|
|
return -ENOMEM;
|
|
}
|
|
virt_addr = alloc_addr;
|
|
|
|
/*
|
|
* 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(dma_addr, align)) {
|
|
if (mw->alloc_size > mw->buff_size) {
|
|
virt_addr = PTR_ALIGN(alloc_addr, align);
|
|
dma_addr = ALIGN(dma_addr, align);
|
|
} else {
|
|
rc = -ENOMEM;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
mw->alloc_addr = alloc_addr;
|
|
mw->virt_addr = virt_addr;
|
|
mw->dma_addr = dma_addr;
|
|
|
|
return 0;
|
|
|
|
err:
|
|
dma_free_coherent(dma_dev, mw->alloc_size, alloc_addr, dma_addr);
|
|
|
|
return rc;
|
|
}
|
|
|
|
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;
|
|
resource_size_t xlat_align;
|
|
resource_size_t xlat_align_size;
|
|
int rc;
|
|
|
|
if (!size)
|
|
return -EINVAL;
|
|
|
|
rc = ntb_mw_get_align(nt->ndev, PIDX, num_mw, &xlat_align,
|
|
&xlat_align_size, NULL);
|
|
if (rc)
|
|
return rc;
|
|
|
|
xlat_size = round_up(size, xlat_align_size);
|
|
buff_size = round_up(size, 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->alloc_size = buff_size;
|
|
|
|
rc = ntb_alloc_mw_buffer(mw, &pdev->dev, xlat_align);
|
|
if (rc) {
|
|
mw->alloc_size *= 2;
|
|
rc = ntb_alloc_mw_buffer(mw, &pdev->dev, xlat_align);
|
|
if (rc) {
|
|
dev_err(&pdev->dev,
|
|
"Unable to alloc aligned MW buff\n");
|
|
mw->xlat_size = 0;
|
|
mw->buff_size = 0;
|
|
mw->alloc_size = 0;
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
/* Notify HW the memory location of the receive buffer */
|
|
rc = ntb_mw_set_trans(nt->ndev, PIDX, 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;
|
|
unsigned int i, count;
|
|
|
|
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);
|
|
|
|
for (i = 0; i < nt->mw_count; i++)
|
|
ntb_free_mw(nt, 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
|
|
*/
|
|
count = ntb_spad_count(nt->ndev);
|
|
for (i = 0; i < count; 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 */
|
|
|
|
if (nt->use_msi) {
|
|
rc = ntb_msi_setup_mws(ndev);
|
|
if (rc) {
|
|
dev_warn(&pdev->dev,
|
|
"Failed to register MSI memory window: %d\n",
|
|
rc);
|
|
nt->use_msi = false;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < nt->qp_count; i++)
|
|
ntb_transport_setup_qp_msi(nt, i);
|
|
|
|
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, PIDX, spad, upper_32_bits(size));
|
|
|
|
spad = MW0_SZ_LOW + (i * 2);
|
|
ntb_peer_spad_write(ndev, PIDX, spad, lower_32_bits(size));
|
|
}
|
|
|
|
ntb_peer_spad_write(ndev, PIDX, NUM_MWS, nt->mw_count);
|
|
|
|
ntb_peer_spad_write(ndev, PIDX, NUM_QPS, nt->qp_count);
|
|
|
|
ntb_peer_spad_write(ndev, PIDX, 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);
|
|
ntb_transport_setup_qp_peer_msi(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, PIDX, QP_LINKS, val | BIT(qp->qp_num));
|
|
|
|
/* query remote spad for qp ready bits */
|
|
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;
|
|
|
|
if (max_mw_size && mw_size > max_mw_size)
|
|
mw_size = max_mw_size;
|
|
|
|
tx_size = (unsigned int)mw_size / num_qps_mw;
|
|
qp_offset = tx_size * (qp_num / mw_count);
|
|
|
|
qp->tx_mw_size = tx_size;
|
|
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, spad_count, max_mw_count_for_spads;
|
|
u64 qp_bitmap;
|
|
int node;
|
|
int rc, i;
|
|
|
|
mw_count = ntb_peer_mw_count(ndev);
|
|
|
|
if (!ndev->ops->mw_set_trans) {
|
|
dev_err(&ndev->dev, "Inbound MW based NTB API is required\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
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");
|
|
|
|
if (ntb_peer_port_count(ndev) != NTB_DEF_PEER_CNT)
|
|
dev_warn(&ndev->dev, "Multi-port NTB devices unsupported\n");
|
|
|
|
node = dev_to_node(&ndev->dev);
|
|
|
|
nt = kzalloc_node(sizeof(*nt), GFP_KERNEL, node);
|
|
if (!nt)
|
|
return -ENOMEM;
|
|
|
|
nt->ndev = ndev;
|
|
|
|
/*
|
|
* If we are using MSI, and have at least one extra memory window,
|
|
* we will reserve the last MW for the MSI window.
|
|
*/
|
|
if (use_msi && mw_count > 1) {
|
|
rc = ntb_msi_init(ndev, ntb_transport_msi_desc_changed);
|
|
if (!rc) {
|
|
mw_count -= 1;
|
|
nt->use_msi = true;
|
|
}
|
|
}
|
|
|
|
spad_count = ntb_spad_count(ndev);
|
|
|
|
/* Limit the MW's based on the availability of scratchpads */
|
|
|
|
if (spad_count < NTB_TRANSPORT_MIN_SPADS) {
|
|
nt->mw_count = 0;
|
|
rc = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
max_mw_count_for_spads = (spad_count - MW0_SZ_HIGH) / 2;
|
|
nt->mw_count = min(mw_count, max_mw_count_for_spads);
|
|
|
|
nt->msi_spad_offset = nt->mw_count * 2 + MW0_SZ_HIGH;
|
|
|
|
nt->mw_vec = kcalloc_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_peer_mw_get_addr(ndev, i, &mw->phys_addr,
|
|
&mw->phys_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 (nt->use_msi) {
|
|
qp_count -= 1;
|
|
nt->msi_db_mask = 1 << qp_count;
|
|
ntb_db_clear_mask(ndev, nt->msi_db_mask);
|
|
}
|
|
|
|
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 = kcalloc_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++;
|
|
/* fall through */
|
|
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++;
|
|
/* fall through */
|
|
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);
|
|
|
|
if (qp->use_msi)
|
|
ntb_msi_peer_trigger(qp->ndev, PIDX, &qp->peer_msi_desc);
|
|
else
|
|
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_dma_addr + 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;
|
|
}
|
|
|
|
qp->tx_mw_dma_addr = 0;
|
|
if (qp->tx_dma_chan) {
|
|
qp->tx_mw_dma_addr =
|
|
dma_map_resource(qp->tx_dma_chan->device->dev,
|
|
qp->tx_mw_phys, qp->tx_mw_size,
|
|
DMA_FROM_DEVICE, 0);
|
|
if (dma_mapping_error(qp->tx_dma_chan->device->dev,
|
|
qp->tx_mw_dma_addr)) {
|
|
qp->tx_mw_dma_addr = 0;
|
|
goto err1;
|
|
}
|
|
}
|
|
|
|
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_KERNEL, 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_KERNEL, 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_mw_dma_addr)
|
|
dma_unmap_resource(qp->tx_dma_chan->device->dev,
|
|
qp->tx_mw_dma_addr, qp->tx_mw_size,
|
|
DMA_FROM_DEVICE, 0);
|
|
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_unmap_resource(chan->device->dev,
|
|
qp->tx_mw_dma_addr, qp->tx_mw_size,
|
|
DMA_FROM_DEVICE, 0);
|
|
|
|
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, PIDX, 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;
|
|
|
|
if (ntb_db_read(nt->ndev) & nt->msi_db_mask) {
|
|
ntb_transport_msi_peer_desc_changed(nt);
|
|
ntb_db_clear(nt->ndev, nt->msi_db_mask);
|
|
}
|
|
|
|
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);
|