1 /*- 2 * Copyright (c) 2012 Adrian Chadd 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer, 10 * without modification. 11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 12 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 13 * redistribution must be conditioned upon including a substantially 14 * similar Disclaimer requirement for further binary redistribution. 15 * 16 * NO WARRANTY 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 27 * THE POSSIBILITY OF SUCH DAMAGES. 28 * 29 * $FreeBSD$ 30 */ 31 #include "opt_ah.h" 32 #include "opt_ath.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/module.h> 38 #include <sys/sysctl.h> 39 #include <sys/bus.h> 40 #include <sys/malloc.h> 41 #include <sys/proc.h> 42 #include <sys/pcpu.h> 43 #include <sys/lock.h> 44 #include <sys/mutex.h> 45 #include <sys/alq.h> 46 47 #include <dev/ath/if_ath_alq.h> 48 49 #ifdef ATH_DEBUG_ALQ 50 static struct ale * 51 if_ath_alq_get(struct if_ath_alq *alq, int len) 52 { 53 struct ale *ale; 54 55 if (alq->sc_alq_isactive == 0) 56 return (NULL); 57 58 ale = alq_getn(alq->sc_alq_alq, len, ALQ_NOWAIT); 59 if (! ale) 60 alq->sc_alq_numlost++; 61 return (ale); 62 } 63 64 void 65 if_ath_alq_init(struct if_ath_alq *alq, const char *devname) 66 { 67 68 bzero(alq, sizeof(*alq)); 69 70 strncpy(alq->sc_alq_devname, devname, ATH_ALQ_DEVNAME_LEN); 71 printf("%s (%s): detached\n", __func__, alq->sc_alq_devname); 72 snprintf(alq->sc_alq_filename, ATH_ALQ_FILENAME_LEN, 73 "/tmp/ath_%s_alq.log", alq->sc_alq_devname); 74 75 /* XXX too conservative, right? */ 76 alq->sc_alq_qsize = (64*1024); 77 } 78 79 void 80 if_ath_alq_tidyup(struct if_ath_alq *alq) 81 { 82 83 if_ath_alq_stop(alq); 84 printf("%s (%s): detached\n", __func__, alq->sc_alq_devname); 85 bzero(alq, sizeof(*alq)); 86 } 87 88 int 89 if_ath_alq_start(struct if_ath_alq *alq) 90 { 91 int error; 92 93 if (alq->sc_alq_isactive) 94 return (0); 95 96 /* 97 * Create a variable-length ALQ. 98 */ 99 error = alq_open(&alq->sc_alq_alq, alq->sc_alq_filename, 100 curthread->td_ucred, ALQ_DEFAULT_CMODE, 101 alq->sc_alq_qsize, 0); 102 103 if (error != 0) { 104 printf("%s (%s): failed, err=%d\n", __func__, 105 alq->sc_alq_devname, error); 106 } else { 107 printf("%s (%s): opened\n", __func__, alq->sc_alq_devname); 108 alq->sc_alq_isactive = 1; 109 } 110 return (error); 111 } 112 113 int 114 if_ath_alq_stop(struct if_ath_alq *alq) 115 { 116 117 if (alq->sc_alq_isactive == 0) 118 return (0); 119 120 printf("%s (%s): closed\n", __func__, alq->sc_alq_devname); 121 122 alq->sc_alq_isactive = 0; 123 alq_close(alq->sc_alq_alq); 124 alq->sc_alq_alq = NULL; 125 126 return (0); 127 } 128 129 /* 130 * Post a debug message to the ALQ. 131 * 132 * "len" is the size of the buf payload in bytes. 133 */ 134 void 135 if_ath_alq_post(struct if_ath_alq *alq, uint16_t op, uint16_t len, 136 const char *buf) 137 { 138 struct if_ath_alq_hdr *ap; 139 struct ale *ale; 140 141 if (! if_ath_alq_checkdebug(alq, op)) 142 return; 143 144 /* 145 * Enforce some semblence of sanity on 'len'. 146 * Although strictly speaking, any length is possible - 147 * just be conservative so things don't get out of hand. 148 */ 149 if (len > ATH_ALQ_PAYLOAD_LEN) 150 len = ATH_ALQ_PAYLOAD_LEN; 151 152 ale = if_ath_alq_get(alq, len + sizeof(struct if_ath_alq_hdr)); 153 154 if (ale == NULL) 155 return; 156 157 ap = (struct if_ath_alq_hdr *) ale->ae_data; 158 ap->threadid = (uint64_t) curthread->td_tid; 159 ap->tstamp = (uint32_t) ticks; 160 ap->op = op; 161 ap->len = len; 162 163 /* 164 * Copy the payload _after_ the header field. 165 */ 166 memcpy(((char *) ap) + sizeof(struct if_ath_alq_hdr), 167 buf, 168 ap->len); 169 170 alq_post(alq->sc_alq_alq, ale); 171 } 172 #endif /* ATH_DEBUG */ 173