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ccfbff6d59
MFC after: 2 weeks
1645 lines
41 KiB
C
1645 lines
41 KiB
C
/*-
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* Copyright (c) 2016-2017 Alexander Motin <mav@FreeBSD.org>
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* Copyright (C) 2013 Intel Corporation
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* Copyright (C) 2015 EMC Corporation
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* 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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* The Non-Transparent Bridge (NTB) is a device that allows you to connect
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* two or more systems using a PCI-e links, providing remote memory access.
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*
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* This module contains a transport for sending and receiving messages by
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* writing to remote memory window(s) provided by underlying NTB device.
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*
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* NOTE: Much of the code in this module is shared with Linux. Any patches may
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* be picked up and redistributed in Linux with a dual GPL/BSD license.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/ktr.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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#include <sys/taskqueue.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/bus.h>
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#include "ntb.h"
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#include "ntb_transport.h"
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#define KTR_NTB KTR_SPARE3
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#define NTB_TRANSPORT_VERSION 4
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static SYSCTL_NODE(_hw, OID_AUTO, ntb_transport, CTLFLAG_RW, 0, "ntb_transport");
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static unsigned g_ntb_transport_debug_level;
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SYSCTL_UINT(_hw_ntb_transport, OID_AUTO, debug_level, CTLFLAG_RWTUN,
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&g_ntb_transport_debug_level, 0,
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"ntb_transport log level -- higher is more verbose");
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#define ntb_printf(lvl, ...) do { \
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if ((lvl) <= g_ntb_transport_debug_level) { \
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printf(__VA_ARGS__); \
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} \
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} while (0)
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static unsigned transport_mtu = 0x10000;
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static uint64_t max_mw_size = 256*1024*1024;
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SYSCTL_UQUAD(_hw_ntb_transport, OID_AUTO, max_mw_size, CTLFLAG_RDTUN, &max_mw_size, 0,
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"If enabled (non-zero), limit the size of large memory windows. "
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"Both sides of the NTB MUST set the same value here.");
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static unsigned enable_xeon_watchdog;
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SYSCTL_UINT(_hw_ntb_transport, OID_AUTO, enable_xeon_watchdog, CTLFLAG_RDTUN,
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&enable_xeon_watchdog, 0, "If non-zero, write a register every second to "
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"keep a watchdog from tearing down the NTB link");
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STAILQ_HEAD(ntb_queue_list, ntb_queue_entry);
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typedef uint32_t ntb_q_idx_t;
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struct ntb_queue_entry {
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/* ntb_queue list reference */
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STAILQ_ENTRY(ntb_queue_entry) entry;
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/* info on data to be transferred */
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void *cb_data;
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void *buf;
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uint32_t len;
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uint32_t flags;
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struct ntb_transport_qp *qp;
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struct ntb_payload_header *x_hdr;
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ntb_q_idx_t index;
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};
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struct ntb_rx_info {
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ntb_q_idx_t 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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device_t dev;
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void *cb_data;
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bool client_ready;
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volatile bool link_is_up;
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uint8_t qp_num; /* Only 64 QPs are allowed. 0-63 */
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struct ntb_rx_info *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 ntb_queue_list tx_free_q;
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struct mtx ntb_tx_free_q_lock;
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caddr_t tx_mw;
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bus_addr_t tx_mw_phys;
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ntb_q_idx_t tx_index;
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ntb_q_idx_t tx_max_entry;
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uint64_t 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 ntb_queue_list rx_post_q;
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struct ntb_queue_list rx_pend_q;
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/* ntb_rx_q_lock: synchronize access to rx_XXXX_q */
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struct mtx ntb_rx_q_lock;
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struct task rxc_db_work;
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struct taskqueue *rxc_tq;
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caddr_t rx_buff;
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ntb_q_idx_t rx_index;
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ntb_q_idx_t rx_max_entry;
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uint64_t rx_max_frame;
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void (*event_handler)(void *data, enum ntb_link_event status);
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struct callout link_work;
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struct callout rx_full;
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uint64_t last_rx_no_buf;
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/* Stats */
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uint64_t rx_bytes;
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uint64_t rx_pkts;
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uint64_t rx_ring_empty;
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uint64_t rx_err_no_buf;
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uint64_t rx_err_oflow;
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uint64_t rx_err_ver;
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uint64_t tx_bytes;
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uint64_t tx_pkts;
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uint64_t tx_ring_full;
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uint64_t tx_err_no_buf;
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struct mtx tx_lock;
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};
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struct ntb_transport_mw {
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vm_paddr_t phys_addr;
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size_t phys_size;
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size_t xlat_align;
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size_t xlat_align_size;
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bus_addr_t addr_limit;
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/* Tx buff is vbase / phys_addr / tx_size */
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caddr_t vbase;
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size_t tx_size;
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/* Rx buff is virt_addr / dma_addr / rx_size */
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bus_dma_tag_t dma_tag;
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bus_dmamap_t dma_map;
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caddr_t virt_addr;
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bus_addr_t dma_addr;
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size_t rx_size;
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/* rx_size increased to size alignment requirements of the hardware. */
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size_t buff_size;
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};
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struct ntb_transport_child {
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device_t dev;
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int consumer;
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int qpoff;
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int qpcnt;
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struct ntb_transport_child *next;
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};
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struct ntb_transport_ctx {
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device_t dev;
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struct ntb_transport_child *child;
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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 mw_count;
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unsigned qp_count;
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uint64_t qp_bitmap;
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volatile bool link_is_up;
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enum ntb_speed link_speed;
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enum ntb_width link_width;
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struct callout link_work;
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struct callout link_watchdog;
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struct task link_cleanup;
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};
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enum {
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NTBT_DESC_DONE_FLAG = 1 << 0,
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NTBT_LINK_DOWN_FLAG = 1 << 1,
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};
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struct ntb_payload_header {
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ntb_q_idx_t ver;
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uint32_t len;
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uint32_t flags;
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};
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enum {
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/*
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* The order of this enum is part of the remote protocol. Do not
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* reorder without bumping protocol version (and it's probably best
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* to keep the protocol in lock-step with the Linux NTB driver.
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*/
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NTBT_VERSION = 0,
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NTBT_QP_LINKS,
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NTBT_NUM_QPS,
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NTBT_NUM_MWS,
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/*
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* N.B.: transport_link_work assumes MW1 enums = MW0 + 2.
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*/
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NTBT_MW0_SZ_HIGH,
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NTBT_MW0_SZ_LOW,
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NTBT_MW1_SZ_HIGH,
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NTBT_MW1_SZ_LOW,
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/*
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* Some NTB-using hardware have a watchdog to work around NTB hangs; if
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* a register or doorbell isn't written every few seconds, the link is
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* torn down. Write an otherwise unused register every few seconds to
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* work around this watchdog.
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*/
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NTBT_WATCHDOG_SPAD = 15
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};
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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 100
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static int ntb_transport_probe(device_t dev);
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static int ntb_transport_attach(device_t dev);
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static int ntb_transport_detach(device_t dev);
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static void ntb_transport_init_queue(struct ntb_transport_ctx *nt,
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unsigned int qp_num);
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static int ntb_process_tx(struct ntb_transport_qp *qp,
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struct ntb_queue_entry *entry);
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static void ntb_transport_rxc_db(void *arg, int pending);
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static int ntb_process_rxc(struct ntb_transport_qp *qp);
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static void ntb_memcpy_rx(struct ntb_transport_qp *qp,
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struct ntb_queue_entry *entry, void *offset);
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static inline void ntb_rx_copy_callback(struct ntb_transport_qp *qp,
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void *data);
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static void ntb_complete_rxc(struct ntb_transport_qp *qp);
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static void ntb_transport_doorbell_callback(void *data, uint32_t vector);
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static void ntb_transport_event_callback(void *data);
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static void ntb_transport_link_work(void *arg);
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static int ntb_set_mw(struct ntb_transport_ctx *, int num_mw, size_t size);
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static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw);
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static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt,
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unsigned int qp_num);
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static void ntb_qp_link_work(void *arg);
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static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt);
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static void ntb_transport_link_cleanup_work(void *, int);
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static void ntb_qp_link_down(struct ntb_transport_qp *qp);
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static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp);
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static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp);
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static void ntb_send_link_down(struct ntb_transport_qp *qp);
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static void ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry,
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struct ntb_queue_list *list);
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static struct ntb_queue_entry *ntb_list_rm(struct mtx *lock,
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struct ntb_queue_list *list);
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static struct ntb_queue_entry *ntb_list_mv(struct mtx *lock,
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struct ntb_queue_list *from, struct ntb_queue_list *to);
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static void xeon_link_watchdog_hb(void *);
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static const struct ntb_ctx_ops ntb_transport_ops = {
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.link_event = ntb_transport_event_callback,
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.db_event = ntb_transport_doorbell_callback,
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};
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MALLOC_DEFINE(M_NTB_T, "ntb_transport", "ntb transport driver");
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static inline void
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iowrite32(uint32_t val, void *addr)
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{
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bus_space_write_4(X86_BUS_SPACE_MEM, 0/* HACK */, (uintptr_t)addr,
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val);
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}
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/* Transport Init and teardown */
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static void
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xeon_link_watchdog_hb(void *arg)
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{
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struct ntb_transport_ctx *nt;
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nt = arg;
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ntb_spad_write(nt->dev, NTBT_WATCHDOG_SPAD, 0);
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callout_reset(&nt->link_watchdog, 1 * hz, xeon_link_watchdog_hb, nt);
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}
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static int
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ntb_transport_probe(device_t dev)
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{
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device_set_desc(dev, "NTB Transport");
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return (0);
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}
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static int
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ntb_transport_attach(device_t dev)
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{
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struct ntb_transport_ctx *nt = device_get_softc(dev);
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struct ntb_transport_child **cpp = &nt->child;
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struct ntb_transport_child *nc;
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struct ntb_transport_mw *mw;
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uint64_t db_bitmap;
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int rc, i, db_count, spad_count, qp, qpu, qpo, qpt;
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char cfg[128] = "";
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char buf[32];
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char *n, *np, *c, *name;
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nt->dev = dev;
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nt->mw_count = ntb_mw_count(dev);
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spad_count = ntb_spad_count(dev);
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db_bitmap = ntb_db_valid_mask(dev);
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db_count = flsll(db_bitmap);
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KASSERT(db_bitmap == (1 << db_count) - 1,
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("Doorbells are not sequential (%jx).\n", db_bitmap));
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if (nt->mw_count == 0) {
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device_printf(dev, "At least 1 memory window required.\n");
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return (ENXIO);
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}
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if (spad_count < 6) {
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device_printf(dev, "At least 6 scratchpads required.\n");
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return (ENXIO);
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}
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if (spad_count < 4 + 2 * nt->mw_count) {
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nt->mw_count = (spad_count - 4) / 2;
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device_printf(dev, "Scratchpads enough only for %d "
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"memory windows.\n", nt->mw_count);
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}
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if (db_bitmap == 0) {
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device_printf(dev, "At least one doorbell required.\n");
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return (ENXIO);
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}
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nt->mw_vec = malloc(nt->mw_count * sizeof(*nt->mw_vec), M_NTB_T,
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M_WAITOK | M_ZERO);
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for (i = 0; i < nt->mw_count; i++) {
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mw = &nt->mw_vec[i];
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rc = ntb_mw_get_range(dev, i, &mw->phys_addr, &mw->vbase,
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&mw->phys_size, &mw->xlat_align, &mw->xlat_align_size,
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&mw->addr_limit);
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if (rc != 0)
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goto err;
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mw->tx_size = mw->phys_size;
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if (max_mw_size != 0 && mw->tx_size > max_mw_size) {
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device_printf(dev, "Memory window %d limited from "
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"%ju to %ju\n", i, (uintmax_t)mw->phys_size,
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max_mw_size);
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mw->tx_size = max_mw_size;
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}
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mw->rx_size = 0;
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mw->buff_size = 0;
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mw->virt_addr = NULL;
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mw->dma_addr = 0;
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rc = ntb_mw_set_wc(dev, i, VM_MEMATTR_WRITE_COMBINING);
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if (rc)
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ntb_printf(0, "Unable to set mw%d caching\n", i);
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/*
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* Try to preallocate receive memory early, since there may
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* be not enough contiguous memory later. It is quite likely
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* that NTB windows are symmetric and this allocation remain,
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* but even if not, we will just reallocate it later.
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*/
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ntb_set_mw(nt, i, mw->tx_size);
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}
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qpu = 0;
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qpo = imin(db_count, nt->mw_count);
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qpt = db_count;
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snprintf(buf, sizeof(buf), "hint.%s.%d.config", device_get_name(dev),
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device_get_unit(dev));
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TUNABLE_STR_FETCH(buf, cfg, sizeof(cfg));
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n = cfg;
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i = 0;
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while ((c = strsep(&n, ",")) != NULL) {
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np = c;
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name = strsep(&np, ":");
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if (name != NULL && name[0] == 0)
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name = NULL;
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qp = (np && np[0] != 0) ? strtol(np, NULL, 10) : qpo - qpu;
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if (qp <= 0)
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qp = 1;
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if (qp > qpt - qpu) {
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device_printf(dev, "Not enough resources for config\n");
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break;
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}
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nc = malloc(sizeof(*nc), M_DEVBUF, M_WAITOK | M_ZERO);
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nc->consumer = i;
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nc->qpoff = qpu;
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nc->qpcnt = qp;
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nc->dev = device_add_child(dev, name, -1);
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if (nc->dev == NULL) {
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device_printf(dev, "Can not add child.\n");
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break;
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}
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device_set_ivars(nc->dev, nc);
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*cpp = nc;
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cpp = &nc->next;
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if (bootverbose) {
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device_printf(dev, "%d \"%s\": queues %d",
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i, name, qpu);
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if (qp > 1)
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printf("-%d", qpu + qp - 1);
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printf("\n");
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}
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qpu += qp;
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i++;
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}
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nt->qp_count = qpu;
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nt->qp_vec = malloc(nt->qp_count * sizeof(*nt->qp_vec), M_NTB_T,
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M_WAITOK | M_ZERO);
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for (i = 0; i < nt->qp_count; i++)
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ntb_transport_init_queue(nt, i);
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callout_init(&nt->link_work, 0);
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callout_init(&nt->link_watchdog, 0);
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TASK_INIT(&nt->link_cleanup, 0, ntb_transport_link_cleanup_work, nt);
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nt->link_is_up = false;
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rc = ntb_set_ctx(dev, nt, &ntb_transport_ops);
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if (rc != 0)
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goto err;
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ntb_link_enable(dev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
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|
|
|
for (i = 0; i < nt->mw_count; i++) {
|
|
mw = &nt->mw_vec[i];
|
|
rc = ntb_mw_set_trans(nt->dev, i, mw->dma_addr, mw->buff_size);
|
|
if (rc != 0)
|
|
ntb_printf(0, "load time mw%d xlat fails, rc %d\n", i, rc);
|
|
}
|
|
|
|
if (enable_xeon_watchdog != 0)
|
|
callout_reset(&nt->link_watchdog, 0, xeon_link_watchdog_hb, nt);
|
|
|
|
bus_generic_attach(dev);
|
|
return (0);
|
|
|
|
err:
|
|
free(nt->qp_vec, M_NTB_T);
|
|
free(nt->mw_vec, M_NTB_T);
|
|
return (rc);
|
|
}
|
|
|
|
static int
|
|
ntb_transport_detach(device_t dev)
|
|
{
|
|
struct ntb_transport_ctx *nt = device_get_softc(dev);
|
|
struct ntb_transport_child **cpp = &nt->child;
|
|
struct ntb_transport_child *nc;
|
|
int error = 0, i;
|
|
|
|
while ((nc = *cpp) != NULL) {
|
|
*cpp = (*cpp)->next;
|
|
error = device_delete_child(dev, nc->dev);
|
|
if (error)
|
|
break;
|
|
free(nc, M_DEVBUF);
|
|
}
|
|
KASSERT(nt->qp_bitmap == 0,
|
|
("Some queues not freed on detach (%jx)", nt->qp_bitmap));
|
|
|
|
ntb_transport_link_cleanup(nt);
|
|
taskqueue_drain(taskqueue_swi, &nt->link_cleanup);
|
|
callout_drain(&nt->link_work);
|
|
callout_drain(&nt->link_watchdog);
|
|
|
|
ntb_link_disable(dev);
|
|
ntb_clear_ctx(dev);
|
|
|
|
for (i = 0; i < nt->mw_count; i++)
|
|
ntb_free_mw(nt, i);
|
|
|
|
free(nt->qp_vec, M_NTB_T);
|
|
free(nt->mw_vec, M_NTB_T);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ntb_transport_print_child(device_t dev, device_t child)
|
|
{
|
|
struct ntb_transport_child *nc = device_get_ivars(child);
|
|
int retval;
|
|
|
|
retval = bus_print_child_header(dev, child);
|
|
if (nc->qpcnt > 0) {
|
|
printf(" queue %d", nc->qpoff);
|
|
if (nc->qpcnt > 1)
|
|
printf("-%d", nc->qpoff + nc->qpcnt - 1);
|
|
}
|
|
retval += printf(" at consumer %d", nc->consumer);
|
|
retval += bus_print_child_domain(dev, child);
|
|
retval += bus_print_child_footer(dev, child);
|
|
|
|
return (retval);
|
|
}
|
|
|
|
static int
|
|
ntb_transport_child_location_str(device_t dev, device_t child, char *buf,
|
|
size_t buflen)
|
|
{
|
|
struct ntb_transport_child *nc = device_get_ivars(child);
|
|
|
|
snprintf(buf, buflen, "consumer=%d", nc->consumer);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
ntb_transport_queue_count(device_t dev)
|
|
{
|
|
struct ntb_transport_child *nc = device_get_ivars(dev);
|
|
|
|
return (nc->qpcnt);
|
|
}
|
|
|
|
static void
|
|
ntb_transport_init_queue(struct ntb_transport_ctx *nt, unsigned int qp_num)
|
|
{
|
|
struct ntb_transport_mw *mw;
|
|
struct ntb_transport_qp *qp;
|
|
vm_paddr_t mw_base;
|
|
uint64_t qp_offset;
|
|
size_t tx_size;
|
|
unsigned num_qps_mw, mw_num, mw_count;
|
|
|
|
mw_count = nt->mw_count;
|
|
mw_num = QP_TO_MW(nt, qp_num);
|
|
mw = &nt->mw_vec[mw_num];
|
|
|
|
qp = &nt->qp_vec[qp_num];
|
|
qp->qp_num = qp_num;
|
|
qp->transport = nt;
|
|
qp->dev = nt->dev;
|
|
qp->client_ready = false;
|
|
qp->event_handler = NULL;
|
|
ntb_qp_link_down_reset(qp);
|
|
|
|
if (mw_num < nt->qp_count % mw_count)
|
|
num_qps_mw = nt->qp_count / mw_count + 1;
|
|
else
|
|
num_qps_mw = nt->qp_count / mw_count;
|
|
|
|
mw_base = mw->phys_addr;
|
|
|
|
tx_size = mw->tx_size / num_qps_mw;
|
|
qp_offset = tx_size * (qp_num / mw_count);
|
|
|
|
qp->tx_mw = mw->vbase + qp_offset;
|
|
KASSERT(qp->tx_mw != NULL, ("uh oh?"));
|
|
|
|
/* XXX Assumes that a vm_paddr_t is equivalent to bus_addr_t */
|
|
qp->tx_mw_phys = mw_base + qp_offset;
|
|
KASSERT(qp->tx_mw_phys != 0, ("uh oh?"));
|
|
|
|
tx_size -= sizeof(struct ntb_rx_info);
|
|
qp->rx_info = (void *)(qp->tx_mw + tx_size);
|
|
|
|
/* Due to house-keeping, there must be at least 2 buffs */
|
|
qp->tx_max_frame = qmin(transport_mtu, tx_size / 2);
|
|
qp->tx_max_entry = tx_size / qp->tx_max_frame;
|
|
|
|
callout_init(&qp->link_work, 0);
|
|
callout_init(&qp->rx_full, 1);
|
|
|
|
mtx_init(&qp->ntb_rx_q_lock, "ntb rx q", NULL, MTX_SPIN);
|
|
mtx_init(&qp->ntb_tx_free_q_lock, "ntb tx free q", NULL, MTX_SPIN);
|
|
mtx_init(&qp->tx_lock, "ntb transport tx", NULL, MTX_DEF);
|
|
TASK_INIT(&qp->rxc_db_work, 0, ntb_transport_rxc_db, qp);
|
|
qp->rxc_tq = taskqueue_create("ntbt_rx", M_WAITOK,
|
|
taskqueue_thread_enqueue, &qp->rxc_tq);
|
|
taskqueue_start_threads(&qp->rxc_tq, 1, PI_NET, "%s rx%d",
|
|
device_get_nameunit(nt->dev), qp_num);
|
|
|
|
STAILQ_INIT(&qp->rx_post_q);
|
|
STAILQ_INIT(&qp->rx_pend_q);
|
|
STAILQ_INIT(&qp->tx_free_q);
|
|
}
|
|
|
|
void
|
|
ntb_transport_free_queue(struct ntb_transport_qp *qp)
|
|
{
|
|
struct ntb_transport_ctx *nt = qp->transport;
|
|
struct ntb_queue_entry *entry;
|
|
|
|
callout_drain(&qp->link_work);
|
|
|
|
ntb_db_set_mask(qp->dev, 1ull << qp->qp_num);
|
|
taskqueue_drain_all(qp->rxc_tq);
|
|
taskqueue_free(qp->rxc_tq);
|
|
|
|
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_pend_q)))
|
|
free(entry, M_NTB_T);
|
|
|
|
while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q)))
|
|
free(entry, M_NTB_T);
|
|
|
|
while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q)))
|
|
free(entry, M_NTB_T);
|
|
|
|
nt->qp_bitmap &= ~(1 << qp->qp_num);
|
|
}
|
|
|
|
/**
|
|
* ntb_transport_create_queue - Create a new NTB transport layer queue
|
|
* @rx_handler: receive callback function
|
|
* @tx_handler: transmit callback function
|
|
* @event_handler: event callback function
|
|
*
|
|
* Create a new NTB transport layer queue and provide the queue with a callback
|
|
* routine for both transmit and receive. The receive callback routine will be
|
|
* used to pass up data when the transport has received it on the queue. The
|
|
* transmit callback routine will be called when the transport has completed the
|
|
* transmission of the data on the queue and the data is ready to be freed.
|
|
*
|
|
* RETURNS: pointer to newly created ntb_queue, NULL on error.
|
|
*/
|
|
struct ntb_transport_qp *
|
|
ntb_transport_create_queue(device_t dev, int q,
|
|
const struct ntb_queue_handlers *handlers, void *data)
|
|
{
|
|
struct ntb_transport_child *nc = device_get_ivars(dev);
|
|
struct ntb_transport_ctx *nt = device_get_softc(device_get_parent(dev));
|
|
struct ntb_queue_entry *entry;
|
|
struct ntb_transport_qp *qp;
|
|
int i;
|
|
|
|
if (q < 0 || q >= nc->qpcnt)
|
|
return (NULL);
|
|
|
|
qp = &nt->qp_vec[nc->qpoff + q];
|
|
nt->qp_bitmap |= (1 << qp->qp_num);
|
|
qp->cb_data = data;
|
|
qp->rx_handler = handlers->rx_handler;
|
|
qp->tx_handler = handlers->tx_handler;
|
|
qp->event_handler = handlers->event_handler;
|
|
|
|
for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
|
|
entry = malloc(sizeof(*entry), M_NTB_T, M_WAITOK | M_ZERO);
|
|
entry->cb_data = data;
|
|
entry->buf = NULL;
|
|
entry->len = transport_mtu;
|
|
entry->qp = qp;
|
|
ntb_list_add(&qp->ntb_rx_q_lock, entry, &qp->rx_pend_q);
|
|
}
|
|
|
|
for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
|
|
entry = malloc(sizeof(*entry), M_NTB_T, M_WAITOK | M_ZERO);
|
|
entry->qp = qp;
|
|
ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
|
|
}
|
|
|
|
ntb_db_clear(dev, 1ull << qp->qp_num);
|
|
return (qp);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct ntb_transport_ctx *nt = qp->transport;
|
|
|
|
qp->client_ready = true;
|
|
|
|
ntb_printf(2, "qp %d client ready\n", qp->qp_num);
|
|
|
|
if (nt->link_is_up)
|
|
callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp);
|
|
}
|
|
|
|
|
|
|
|
/* Transport Tx */
|
|
|
|
/**
|
|
* 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->link_is_up || len == 0) {
|
|
CTR0(KTR_NTB, "TX: link not up");
|
|
return (EINVAL);
|
|
}
|
|
|
|
entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
|
|
if (entry == NULL) {
|
|
CTR0(KTR_NTB, "TX: could not get entry from tx_free_q");
|
|
qp->tx_err_no_buf++;
|
|
return (EBUSY);
|
|
}
|
|
CTR1(KTR_NTB, "TX: got entry %p from tx_free_q", entry);
|
|
|
|
entry->cb_data = cb;
|
|
entry->buf = data;
|
|
entry->len = len;
|
|
entry->flags = 0;
|
|
|
|
mtx_lock(&qp->tx_lock);
|
|
rc = ntb_process_tx(qp, entry);
|
|
mtx_unlock(&qp->tx_lock);
|
|
if (rc != 0) {
|
|
ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
|
|
CTR1(KTR_NTB,
|
|
"TX: process_tx failed. Returning entry %p to tx_free_q",
|
|
entry);
|
|
}
|
|
return (rc);
|
|
}
|
|
|
|
static void
|
|
ntb_tx_copy_callback(void *data)
|
|
{
|
|
struct ntb_queue_entry *entry = data;
|
|
struct ntb_transport_qp *qp = entry->qp;
|
|
struct ntb_payload_header *hdr = entry->x_hdr;
|
|
|
|
iowrite32(entry->flags | NTBT_DESC_DONE_FLAG, &hdr->flags);
|
|
CTR1(KTR_NTB, "TX: hdr %p set DESC_DONE", hdr);
|
|
|
|
ntb_peer_db_set(qp->dev, 1ull << 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->buf,
|
|
entry->len);
|
|
else
|
|
m_freem(entry->buf);
|
|
entry->buf = NULL;
|
|
}
|
|
|
|
CTR3(KTR_NTB,
|
|
"TX: entry %p sent. hdr->ver = %u, hdr->flags = 0x%x, Returning "
|
|
"to tx_free_q", entry, hdr->ver, hdr->flags);
|
|
ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
|
|
}
|
|
|
|
static void
|
|
ntb_memcpy_tx(struct ntb_queue_entry *entry, void *offset)
|
|
{
|
|
|
|
CTR2(KTR_NTB, "TX: copying %d bytes to offset %p", entry->len, offset);
|
|
if (entry->buf != NULL) {
|
|
m_copydata((struct mbuf *)entry->buf, 0, entry->len, offset);
|
|
|
|
/*
|
|
* Ensure that the data is fully copied before setting the
|
|
* flags
|
|
*/
|
|
wmb();
|
|
}
|
|
|
|
ntb_tx_copy_callback(entry);
|
|
}
|
|
|
|
static void
|
|
ntb_async_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry)
|
|
{
|
|
struct ntb_payload_header *hdr;
|
|
void *offset;
|
|
|
|
offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index;
|
|
hdr = (struct ntb_payload_header *)((char *)offset + qp->tx_max_frame -
|
|
sizeof(struct ntb_payload_header));
|
|
entry->x_hdr = hdr;
|
|
|
|
iowrite32(entry->len, &hdr->len);
|
|
iowrite32(qp->tx_pkts, &hdr->ver);
|
|
|
|
ntb_memcpy_tx(entry, offset);
|
|
}
|
|
|
|
static int
|
|
ntb_process_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry)
|
|
{
|
|
|
|
CTR3(KTR_NTB,
|
|
"TX: process_tx: tx_pkts=%lu, tx_index=%u, remote entry=%u",
|
|
qp->tx_pkts, qp->tx_index, qp->remote_rx_info->entry);
|
|
if (qp->tx_index == qp->remote_rx_info->entry) {
|
|
CTR0(KTR_NTB, "TX: ring full");
|
|
qp->tx_ring_full++;
|
|
return (EAGAIN);
|
|
}
|
|
|
|
if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) {
|
|
if (qp->tx_handler != NULL)
|
|
qp->tx_handler(qp, qp->cb_data, entry->buf,
|
|
EIO);
|
|
else
|
|
m_freem(entry->buf);
|
|
|
|
entry->buf = NULL;
|
|
ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
|
|
CTR1(KTR_NTB,
|
|
"TX: frame too big. returning entry %p to tx_free_q",
|
|
entry);
|
|
return (0);
|
|
}
|
|
CTR2(KTR_NTB, "TX: copying entry %p to index %u", entry, qp->tx_index);
|
|
ntb_async_tx(qp, entry);
|
|
|
|
qp->tx_index++;
|
|
qp->tx_index %= qp->tx_max_entry;
|
|
|
|
qp->tx_pkts++;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* Transport Rx */
|
|
static void
|
|
ntb_transport_rxc_db(void *arg, int pending __unused)
|
|
{
|
|
struct ntb_transport_qp *qp = arg;
|
|
uint64_t qp_mask = 1ull << qp->qp_num;
|
|
int rc;
|
|
|
|
CTR0(KTR_NTB, "RX: transport_rx");
|
|
again:
|
|
while ((rc = ntb_process_rxc(qp)) == 0)
|
|
;
|
|
CTR1(KTR_NTB, "RX: process_rxc returned %d", rc);
|
|
|
|
if ((ntb_db_read(qp->dev) & qp_mask) != 0) {
|
|
/* If db is set, clear it and check queue once more. */
|
|
ntb_db_clear(qp->dev, qp_mask);
|
|
goto again;
|
|
}
|
|
if (qp->link_is_up)
|
|
ntb_db_clear_mask(qp->dev, qp_mask);
|
|
}
|
|
|
|
static int
|
|
ntb_process_rxc(struct ntb_transport_qp *qp)
|
|
{
|
|
struct ntb_payload_header *hdr;
|
|
struct ntb_queue_entry *entry;
|
|
caddr_t offset;
|
|
|
|
offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index;
|
|
hdr = (void *)(offset + qp->rx_max_frame -
|
|
sizeof(struct ntb_payload_header));
|
|
|
|
CTR1(KTR_NTB, "RX: process_rxc rx_index = %u", qp->rx_index);
|
|
if ((hdr->flags & NTBT_DESC_DONE_FLAG) == 0) {
|
|
CTR0(KTR_NTB, "RX: hdr not done");
|
|
qp->rx_ring_empty++;
|
|
return (EAGAIN);
|
|
}
|
|
|
|
if ((hdr->flags & NTBT_LINK_DOWN_FLAG) != 0) {
|
|
CTR0(KTR_NTB, "RX: link down");
|
|
ntb_qp_link_down(qp);
|
|
hdr->flags = 0;
|
|
return (EAGAIN);
|
|
}
|
|
|
|
if (hdr->ver != (uint32_t)qp->rx_pkts) {
|
|
CTR2(KTR_NTB,"RX: ver != rx_pkts (%x != %lx). "
|
|
"Returning entry to rx_pend_q", hdr->ver, qp->rx_pkts);
|
|
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 == NULL) {
|
|
qp->rx_err_no_buf++;
|
|
CTR0(KTR_NTB, "RX: No entries in rx_pend_q");
|
|
return (EAGAIN);
|
|
}
|
|
callout_stop(&qp->rx_full);
|
|
CTR1(KTR_NTB, "RX: rx entry %p from rx_pend_q", entry);
|
|
|
|
entry->x_hdr = hdr;
|
|
entry->index = qp->rx_index;
|
|
|
|
if (hdr->len > entry->len) {
|
|
CTR2(KTR_NTB, "RX: len too long. Wanted %ju got %ju",
|
|
(uintmax_t)hdr->len, (uintmax_t)entry->len);
|
|
qp->rx_err_oflow++;
|
|
|
|
entry->len = -EIO;
|
|
entry->flags |= NTBT_DESC_DONE_FLAG;
|
|
|
|
ntb_complete_rxc(qp);
|
|
} else {
|
|
qp->rx_bytes += hdr->len;
|
|
qp->rx_pkts++;
|
|
|
|
CTR1(KTR_NTB, "RX: received %ld rx_pkts", qp->rx_pkts);
|
|
|
|
entry->len = hdr->len;
|
|
|
|
ntb_memcpy_rx(qp, entry, offset);
|
|
}
|
|
|
|
qp->rx_index++;
|
|
qp->rx_index %= qp->rx_max_entry;
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
ntb_memcpy_rx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry,
|
|
void *offset)
|
|
{
|
|
struct ifnet *ifp = entry->cb_data;
|
|
unsigned int len = entry->len;
|
|
|
|
CTR2(KTR_NTB, "RX: copying %d bytes from offset %p", len, offset);
|
|
|
|
entry->buf = (void *)m_devget(offset, len, 0, ifp, NULL);
|
|
if (entry->buf == NULL)
|
|
entry->len = -ENOMEM;
|
|
|
|
/* Ensure that the data is globally visible before clearing the flag */
|
|
wmb();
|
|
|
|
CTR2(KTR_NTB, "RX: copied entry %p to mbuf %p.", entry, entry->buf);
|
|
ntb_rx_copy_callback(qp, entry);
|
|
}
|
|
|
|
static inline void
|
|
ntb_rx_copy_callback(struct ntb_transport_qp *qp, void *data)
|
|
{
|
|
struct ntb_queue_entry *entry;
|
|
|
|
entry = data;
|
|
entry->flags |= NTBT_DESC_DONE_FLAG;
|
|
ntb_complete_rxc(qp);
|
|
}
|
|
|
|
static void
|
|
ntb_complete_rxc(struct ntb_transport_qp *qp)
|
|
{
|
|
struct ntb_queue_entry *entry;
|
|
struct mbuf *m;
|
|
unsigned len;
|
|
|
|
CTR0(KTR_NTB, "RX: rx_completion_task");
|
|
|
|
mtx_lock_spin(&qp->ntb_rx_q_lock);
|
|
|
|
while (!STAILQ_EMPTY(&qp->rx_post_q)) {
|
|
entry = STAILQ_FIRST(&qp->rx_post_q);
|
|
if ((entry->flags & NTBT_DESC_DONE_FLAG) == 0)
|
|
break;
|
|
|
|
entry->x_hdr->flags = 0;
|
|
iowrite32(entry->index, &qp->rx_info->entry);
|
|
|
|
STAILQ_REMOVE_HEAD(&qp->rx_post_q, entry);
|
|
|
|
len = entry->len;
|
|
m = entry->buf;
|
|
|
|
/*
|
|
* Re-initialize queue_entry for reuse; rx_handler takes
|
|
* ownership of the mbuf.
|
|
*/
|
|
entry->buf = NULL;
|
|
entry->len = transport_mtu;
|
|
entry->cb_data = qp->cb_data;
|
|
|
|
STAILQ_INSERT_TAIL(&qp->rx_pend_q, entry, entry);
|
|
|
|
mtx_unlock_spin(&qp->ntb_rx_q_lock);
|
|
|
|
CTR2(KTR_NTB, "RX: completing entry %p, mbuf %p", entry, m);
|
|
if (qp->rx_handler != NULL && qp->client_ready)
|
|
qp->rx_handler(qp, qp->cb_data, m, len);
|
|
else
|
|
m_freem(m);
|
|
|
|
mtx_lock_spin(&qp->ntb_rx_q_lock);
|
|
}
|
|
|
|
mtx_unlock_spin(&qp->ntb_rx_q_lock);
|
|
}
|
|
|
|
static void
|
|
ntb_transport_doorbell_callback(void *data, uint32_t vector)
|
|
{
|
|
struct ntb_transport_ctx *nt = data;
|
|
struct ntb_transport_qp *qp;
|
|
uint64_t vec_mask;
|
|
unsigned qp_num;
|
|
|
|
vec_mask = ntb_db_vector_mask(nt->dev, vector);
|
|
vec_mask &= nt->qp_bitmap;
|
|
if ((vec_mask & (vec_mask - 1)) != 0)
|
|
vec_mask &= ntb_db_read(nt->dev);
|
|
if (vec_mask != 0) {
|
|
ntb_db_set_mask(nt->dev, vec_mask);
|
|
ntb_db_clear(nt->dev, vec_mask);
|
|
}
|
|
while (vec_mask != 0) {
|
|
qp_num = ffsll(vec_mask) - 1;
|
|
|
|
qp = &nt->qp_vec[qp_num];
|
|
if (qp->link_is_up)
|
|
taskqueue_enqueue(qp->rxc_tq, &qp->rxc_db_work);
|
|
|
|
vec_mask &= ~(1ull << qp_num);
|
|
}
|
|
}
|
|
|
|
/* Link Event handler */
|
|
static void
|
|
ntb_transport_event_callback(void *data)
|
|
{
|
|
struct ntb_transport_ctx *nt = data;
|
|
|
|
if (ntb_link_is_up(nt->dev, &nt->link_speed, &nt->link_width)) {
|
|
ntb_printf(1, "HW link up\n");
|
|
callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt);
|
|
} else {
|
|
ntb_printf(1, "HW link down\n");
|
|
taskqueue_enqueue(taskqueue_swi, &nt->link_cleanup);
|
|
}
|
|
}
|
|
|
|
/* Link bring up */
|
|
static void
|
|
ntb_transport_link_work(void *arg)
|
|
{
|
|
struct ntb_transport_ctx *nt = arg;
|
|
struct ntb_transport_mw *mw;
|
|
device_t dev = nt->dev;
|
|
struct ntb_transport_qp *qp;
|
|
uint64_t val64, size;
|
|
uint32_t val;
|
|
unsigned i;
|
|
int rc;
|
|
|
|
/* 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].tx_size;
|
|
ntb_peer_spad_write(dev, NTBT_MW0_SZ_HIGH + (i * 2),
|
|
size >> 32);
|
|
ntb_peer_spad_write(dev, NTBT_MW0_SZ_LOW + (i * 2), size);
|
|
}
|
|
ntb_peer_spad_write(dev, NTBT_NUM_MWS, nt->mw_count);
|
|
ntb_peer_spad_write(dev, NTBT_NUM_QPS, nt->qp_count);
|
|
ntb_peer_spad_write(dev, NTBT_QP_LINKS, 0);
|
|
ntb_peer_spad_write(dev, NTBT_VERSION, NTB_TRANSPORT_VERSION);
|
|
|
|
/* Query the remote side for its info */
|
|
val = 0;
|
|
ntb_spad_read(dev, NTBT_VERSION, &val);
|
|
if (val != NTB_TRANSPORT_VERSION)
|
|
goto out;
|
|
|
|
ntb_spad_read(dev, NTBT_NUM_QPS, &val);
|
|
if (val != nt->qp_count)
|
|
goto out;
|
|
|
|
ntb_spad_read(dev, NTBT_NUM_MWS, &val);
|
|
if (val != nt->mw_count)
|
|
goto out;
|
|
|
|
for (i = 0; i < nt->mw_count; i++) {
|
|
ntb_spad_read(dev, NTBT_MW0_SZ_HIGH + (i * 2), &val);
|
|
val64 = (uint64_t)val << 32;
|
|
|
|
ntb_spad_read(dev, NTBT_MW0_SZ_LOW + (i * 2), &val);
|
|
val64 |= val;
|
|
|
|
mw = &nt->mw_vec[i];
|
|
mw->rx_size = val64;
|
|
val64 = roundup(val64, mw->xlat_align_size);
|
|
if (mw->buff_size != val64) {
|
|
|
|
rc = ntb_set_mw(nt, i, val64);
|
|
if (rc != 0) {
|
|
ntb_printf(0, "link up set mw%d fails, rc %d\n",
|
|
i, rc);
|
|
goto free_mws;
|
|
}
|
|
|
|
/* Notify HW the memory location of the receive buffer */
|
|
rc = ntb_mw_set_trans(nt->dev, i, mw->dma_addr,
|
|
mw->buff_size);
|
|
if (rc != 0) {
|
|
ntb_printf(0, "link up mw%d xlat fails, rc %d\n",
|
|
i, rc);
|
|
goto free_mws;
|
|
}
|
|
}
|
|
}
|
|
|
|
nt->link_is_up = true;
|
|
ntb_printf(1, "transport link up\n");
|
|
|
|
for (i = 0; i < nt->qp_count; i++) {
|
|
qp = &nt->qp_vec[i];
|
|
|
|
ntb_transport_setup_qp_mw(nt, i);
|
|
|
|
if (qp->client_ready)
|
|
callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp);
|
|
}
|
|
|
|
return;
|
|
|
|
free_mws:
|
|
for (i = 0; i < nt->mw_count; i++)
|
|
ntb_free_mw(nt, i);
|
|
out:
|
|
if (ntb_link_is_up(dev, &nt->link_speed, &nt->link_width))
|
|
callout_reset(&nt->link_work,
|
|
NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_transport_link_work, nt);
|
|
}
|
|
|
|
struct ntb_load_cb_args {
|
|
bus_addr_t addr;
|
|
int error;
|
|
};
|
|
|
|
static void
|
|
ntb_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
|
|
{
|
|
struct ntb_load_cb_args *cba = (struct ntb_load_cb_args *)xsc;
|
|
|
|
if (!(cba->error = error))
|
|
cba->addr = segs[0].ds_addr;
|
|
}
|
|
|
|
static int
|
|
ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, size_t size)
|
|
{
|
|
struct ntb_transport_mw *mw = &nt->mw_vec[num_mw];
|
|
struct ntb_load_cb_args cba;
|
|
size_t buff_size;
|
|
|
|
if (size == 0)
|
|
return (EINVAL);
|
|
|
|
buff_size = roundup(size, mw->xlat_align_size);
|
|
|
|
/* No need to re-setup */
|
|
if (mw->buff_size == buff_size)
|
|
return (0);
|
|
|
|
if (mw->buff_size != 0)
|
|
ntb_free_mw(nt, num_mw);
|
|
|
|
/* Alloc memory for receiving data. Must be aligned */
|
|
mw->buff_size = buff_size;
|
|
|
|
if (bus_dma_tag_create(bus_get_dma_tag(nt->dev), mw->xlat_align, 0,
|
|
mw->addr_limit, BUS_SPACE_MAXADDR,
|
|
NULL, NULL, mw->buff_size, 1, mw->buff_size,
|
|
0, NULL, NULL, &mw->dma_tag)) {
|
|
ntb_printf(0, "Unable to create MW tag of size %zu\n",
|
|
mw->buff_size);
|
|
mw->buff_size = 0;
|
|
return (ENOMEM);
|
|
}
|
|
if (bus_dmamem_alloc(mw->dma_tag, (void **)&mw->virt_addr,
|
|
BUS_DMA_WAITOK | BUS_DMA_ZERO, &mw->dma_map)) {
|
|
bus_dma_tag_destroy(mw->dma_tag);
|
|
ntb_printf(0, "Unable to allocate MW buffer of size %zu\n",
|
|
mw->buff_size);
|
|
mw->buff_size = 0;
|
|
return (ENOMEM);
|
|
}
|
|
if (bus_dmamap_load(mw->dma_tag, mw->dma_map, mw->virt_addr,
|
|
mw->buff_size, ntb_load_cb, &cba, BUS_DMA_NOWAIT) || cba.error) {
|
|
bus_dmamem_free(mw->dma_tag, mw->virt_addr, mw->dma_map);
|
|
bus_dma_tag_destroy(mw->dma_tag);
|
|
ntb_printf(0, "Unable to load MW buffer of size %zu\n",
|
|
mw->buff_size);
|
|
mw->buff_size = 0;
|
|
return (ENOMEM);
|
|
}
|
|
mw->dma_addr = cba.addr;
|
|
|
|
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];
|
|
|
|
if (mw->virt_addr == NULL)
|
|
return;
|
|
|
|
ntb_mw_clear_trans(nt->dev, num_mw);
|
|
bus_dmamap_unload(mw->dma_tag, mw->dma_map);
|
|
bus_dmamem_free(mw->dma_tag, mw->virt_addr, mw->dma_map);
|
|
bus_dma_tag_destroy(mw->dma_tag);
|
|
mw->buff_size = 0;
|
|
mw->virt_addr = NULL;
|
|
}
|
|
|
|
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;
|
|
void *offset;
|
|
ntb_q_idx_t i;
|
|
size_t rx_size;
|
|
unsigned num_qps_mw, mw_num, mw_count;
|
|
|
|
mw_count = nt->mw_count;
|
|
mw_num = QP_TO_MW(nt, qp_num);
|
|
mw = &nt->mw_vec[mw_num];
|
|
|
|
if (mw->virt_addr == NULL)
|
|
return (ENOMEM);
|
|
|
|
if (mw_num < nt->qp_count % mw_count)
|
|
num_qps_mw = nt->qp_count / mw_count + 1;
|
|
else
|
|
num_qps_mw = nt->qp_count / mw_count;
|
|
|
|
rx_size = mw->rx_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 = (void*)(qp->rx_buff + rx_size);
|
|
|
|
/* Due to house-keeping, there must be at least 2 buffs */
|
|
qp->rx_max_frame = qmin(transport_mtu, rx_size / 2);
|
|
qp->rx_max_entry = rx_size / qp->rx_max_frame;
|
|
qp->rx_index = 0;
|
|
|
|
qp->remote_rx_info->entry = qp->rx_max_entry - 1;
|
|
|
|
/* Set up the hdr offsets with 0s */
|
|
for (i = 0; i < qp->rx_max_entry; i++) {
|
|
offset = (void *)(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_qp_link_work(void *arg)
|
|
{
|
|
struct ntb_transport_qp *qp = arg;
|
|
device_t dev = qp->dev;
|
|
struct ntb_transport_ctx *nt = qp->transport;
|
|
int i;
|
|
uint32_t val;
|
|
|
|
/* Report queues that are up on our side */
|
|
for (i = 0, val = 0; i < nt->qp_count; i++) {
|
|
if (nt->qp_vec[i].client_ready)
|
|
val |= (1 << i);
|
|
}
|
|
ntb_peer_spad_write(dev, NTBT_QP_LINKS, val);
|
|
|
|
/* See if the remote side is up */
|
|
ntb_spad_read(dev, NTBT_QP_LINKS, &val);
|
|
if ((val & (1ull << qp->qp_num)) != 0) {
|
|
ntb_printf(2, "qp %d link up\n", qp->qp_num);
|
|
qp->link_is_up = true;
|
|
|
|
if (qp->event_handler != NULL)
|
|
qp->event_handler(qp->cb_data, NTB_LINK_UP);
|
|
|
|
ntb_db_clear_mask(dev, 1ull << qp->qp_num);
|
|
} else if (nt->link_is_up)
|
|
callout_reset(&qp->link_work,
|
|
NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp);
|
|
}
|
|
|
|
/* Link down event*/
|
|
static void
|
|
ntb_transport_link_cleanup(struct ntb_transport_ctx *nt)
|
|
{
|
|
struct ntb_transport_qp *qp;
|
|
int i;
|
|
|
|
callout_drain(&nt->link_work);
|
|
nt->link_is_up = 0;
|
|
|
|
/* Pass along the info to any clients */
|
|
for (i = 0; i < nt->qp_count; i++) {
|
|
if ((nt->qp_bitmap & (1 << i)) != 0) {
|
|
qp = &nt->qp_vec[i];
|
|
ntb_qp_link_cleanup(qp);
|
|
callout_drain(&qp->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
|
|
*/
|
|
ntb_spad_clear(nt->dev);
|
|
}
|
|
|
|
static void
|
|
ntb_transport_link_cleanup_work(void *arg, int pending __unused)
|
|
{
|
|
|
|
ntb_transport_link_cleanup(arg);
|
|
}
|
|
|
|
static void
|
|
ntb_qp_link_down(struct ntb_transport_qp *qp)
|
|
{
|
|
|
|
ntb_qp_link_cleanup(qp);
|
|
}
|
|
|
|
static void
|
|
ntb_qp_link_down_reset(struct ntb_transport_qp *qp)
|
|
{
|
|
|
|
qp->link_is_up = false;
|
|
ntb_db_set_mask(qp->dev, 1ull << qp->qp_num);
|
|
|
|
qp->tx_index = qp->rx_index = 0;
|
|
qp->tx_bytes = qp->rx_bytes = 0;
|
|
qp->tx_pkts = qp->rx_pkts = 0;
|
|
|
|
qp->rx_ring_empty = 0;
|
|
qp->tx_ring_full = 0;
|
|
|
|
qp->rx_err_no_buf = qp->tx_err_no_buf = 0;
|
|
qp->rx_err_oflow = qp->rx_err_ver = 0;
|
|
}
|
|
|
|
static void
|
|
ntb_qp_link_cleanup(struct ntb_transport_qp *qp)
|
|
{
|
|
|
|
callout_drain(&qp->link_work);
|
|
ntb_qp_link_down_reset(qp);
|
|
|
|
if (qp->event_handler != NULL)
|
|
qp->event_handler(qp->cb_data, NTB_LINK_DOWN);
|
|
}
|
|
|
|
/* Link commanded down */
|
|
/**
|
|
* 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)
|
|
{
|
|
struct ntb_transport_ctx *nt = qp->transport;
|
|
int i;
|
|
uint32_t val;
|
|
|
|
qp->client_ready = false;
|
|
for (i = 0, val = 0; i < nt->qp_count; i++) {
|
|
if (nt->qp_vec[i].client_ready)
|
|
val |= (1 << i);
|
|
}
|
|
ntb_peer_spad_write(qp->dev, NTBT_QP_LINKS, val);
|
|
|
|
if (qp->link_is_up)
|
|
ntb_send_link_down(qp);
|
|
else
|
|
callout_drain(&qp->link_work);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
|
|
return (qp->link_is_up);
|
|
}
|
|
|
|
/**
|
|
* ntb_transport_link_speed - Query transport link speed
|
|
* @qp: NTB transport layer queue to be queried
|
|
*
|
|
* Query connection speed to the remote system of the NTB transport queue
|
|
*
|
|
* RETURNS: link speed in bits per second
|
|
*/
|
|
uint64_t
|
|
ntb_transport_link_speed(struct ntb_transport_qp *qp)
|
|
{
|
|
struct ntb_transport_ctx *nt = qp->transport;
|
|
uint64_t rate;
|
|
|
|
if (!nt->link_is_up)
|
|
return (0);
|
|
switch (nt->link_speed) {
|
|
case NTB_SPEED_GEN1:
|
|
rate = 2500000000 * 8 / 10;
|
|
break;
|
|
case NTB_SPEED_GEN2:
|
|
rate = 5000000000 * 8 / 10;
|
|
break;
|
|
case NTB_SPEED_GEN3:
|
|
rate = 8000000000 * 128 / 130;
|
|
break;
|
|
case NTB_SPEED_GEN4:
|
|
rate = 16000000000 * 128 / 130;
|
|
break;
|
|
default:
|
|
return (0);
|
|
}
|
|
if (nt->link_width <= 0)
|
|
return (0);
|
|
return (rate * nt->link_width);
|
|
}
|
|
|
|
static void
|
|
ntb_send_link_down(struct ntb_transport_qp *qp)
|
|
{
|
|
struct ntb_queue_entry *entry;
|
|
int i, rc;
|
|
|
|
if (!qp->link_is_up)
|
|
return;
|
|
|
|
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 != NULL)
|
|
break;
|
|
pause("NTB Wait for link down", hz / 10);
|
|
}
|
|
|
|
if (entry == NULL)
|
|
return;
|
|
|
|
entry->cb_data = NULL;
|
|
entry->buf = NULL;
|
|
entry->len = 0;
|
|
entry->flags = NTBT_LINK_DOWN_FLAG;
|
|
|
|
mtx_lock(&qp->tx_lock);
|
|
rc = ntb_process_tx(qp, entry);
|
|
mtx_unlock(&qp->tx_lock);
|
|
if (rc != 0)
|
|
printf("ntb: Failed to send link down\n");
|
|
|
|
ntb_qp_link_down_reset(qp);
|
|
}
|
|
|
|
|
|
/* List Management */
|
|
|
|
static void
|
|
ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry,
|
|
struct ntb_queue_list *list)
|
|
{
|
|
|
|
mtx_lock_spin(lock);
|
|
STAILQ_INSERT_TAIL(list, entry, entry);
|
|
mtx_unlock_spin(lock);
|
|
}
|
|
|
|
static struct ntb_queue_entry *
|
|
ntb_list_rm(struct mtx *lock, struct ntb_queue_list *list)
|
|
{
|
|
struct ntb_queue_entry *entry;
|
|
|
|
mtx_lock_spin(lock);
|
|
if (STAILQ_EMPTY(list)) {
|
|
entry = NULL;
|
|
goto out;
|
|
}
|
|
entry = STAILQ_FIRST(list);
|
|
STAILQ_REMOVE_HEAD(list, entry);
|
|
out:
|
|
mtx_unlock_spin(lock);
|
|
|
|
return (entry);
|
|
}
|
|
|
|
static struct ntb_queue_entry *
|
|
ntb_list_mv(struct mtx *lock, struct ntb_queue_list *from,
|
|
struct ntb_queue_list *to)
|
|
{
|
|
struct ntb_queue_entry *entry;
|
|
|
|
mtx_lock_spin(lock);
|
|
if (STAILQ_EMPTY(from)) {
|
|
entry = NULL;
|
|
goto out;
|
|
}
|
|
entry = STAILQ_FIRST(from);
|
|
STAILQ_REMOVE_HEAD(from, entry);
|
|
STAILQ_INSERT_TAIL(to, entry, entry);
|
|
|
|
out:
|
|
mtx_unlock_spin(lock);
|
|
return (entry);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
|
|
return (qp->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)
|
|
{
|
|
|
|
return (qp->tx_max_frame - sizeof(struct ntb_payload_header));
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static device_method_t ntb_transport_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, ntb_transport_probe),
|
|
DEVMETHOD(device_attach, ntb_transport_attach),
|
|
DEVMETHOD(device_detach, ntb_transport_detach),
|
|
/* Bus interface */
|
|
DEVMETHOD(bus_child_location_str, ntb_transport_child_location_str),
|
|
DEVMETHOD(bus_print_child, ntb_transport_print_child),
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
devclass_t ntb_transport_devclass;
|
|
static DEFINE_CLASS_0(ntb_transport, ntb_transport_driver,
|
|
ntb_transport_methods, sizeof(struct ntb_transport_ctx));
|
|
DRIVER_MODULE(ntb_transport, ntb_hw, ntb_transport_driver,
|
|
ntb_transport_devclass, NULL, NULL);
|
|
MODULE_DEPEND(ntb_transport, ntb, 1, 1, 1);
|
|
MODULE_VERSION(ntb_transport, 1);
|