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tcp_log_dev.c
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tcp_log_dev.h
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Editing: tcp_log_dev.h
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2016 Netflix, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #ifndef __tcp_log_dev_h__ #define __tcp_log_dev_h__ /* * This is the common header for data streamed from the log device. All * blocks of data need to start with this header. */ struct tcp_log_common_header { uint32_t tlch_version; /* Version is specific to type. */ uint32_t tlch_type; /* Type of entry(ies) that follow. */ uint64_t tlch_length; /* Total length, including header. */ } __packed; #define TCP_LOG_DEV_TYPE_BBR 1 /* black box recorder */ #ifdef _KERNEL /* * This is a queue entry. All queue entries need to start with this structure * so the common code can cast them to this structure; however, other modules * are free to include additional data after this structure. * * The elements are explained here: * tldq_queue: used by the common code to maintain this entry's position in the * queue. * tldq_buf: should be NULL, or a pointer to a chunk of data. The data must be * as long as the common header indicates. * tldq_xform: If tldq_buf is NULL, the code will call this to create the * the tldq_buf object. The function should *not* directly modify tldq_buf, * but should return the buffer (which must meet the restrictions * indicated for tldq_buf). * tldq_dtor: This function is called to free the queue entry. If tldq_buf is * not NULL, the dtor function must free that, too. * tldq_refcnt: used by the common code to indicate how many readers still need * this data. */ struct tcp_log_dev_queue { STAILQ_ENTRY(tcp_log_dev_queue) tldq_queue; struct tcp_log_common_header *tldq_buf; struct tcp_log_common_header *(*tldq_xform)(struct tcp_log_dev_queue *entry); void (*tldq_dtor)(struct tcp_log_dev_queue *entry); volatile u_int tldq_refcnt; }; STAILQ_HEAD(log_queueh, tcp_log_dev_queue); struct tcp_log_dev_info { STAILQ_ENTRY(tcp_log_dev_info) tldi_list; struct tcp_log_dev_queue *tldi_head; struct tcp_log_common_header *tldi_cur; off_t tldi_off; }; STAILQ_HEAD(log_infoh, tcp_log_dev_info); #ifdef TCP_BLACKBOX MALLOC_DECLARE(M_TCPLOGDEV); int tcp_log_dev_add_log(struct tcp_log_dev_queue *entry); #endif /* TCP_BLACKBOX */ #endif /* _KERNEL */ #endif /* !__tcp_log_dev_h__ */
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