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dahdi: Add capability to generate events on buffer underruns and overruns

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Add BUFFEVENTS and individual buffer event channel flags so that DAHDI can
notify userspace processes when it is dropping data.  This can be useful when
trouble shooting fax problems since DAHDI currently silently discards data
becasuse of scheduling latency.  With this change, Asterisk could log an event
as opposed to just leaving it up to the tone detectors to figure out there was
some unexpected phase shift.

Acked-by: Shaun Ruffell <sruffell@digium.com>
(original patch by Matt Fredrickson)


git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9905 a0bf4364-ded3-4de4-8d8a-66a801d63aff
This commit is contained in:
Kinsey Moore 2011-04-15 16:16:19 +00:00
parent d0093c16cc
commit e591241187
3 changed files with 48 additions and 0 deletions
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29
drivers/dahdi/dahdi-base.c
View File

@ -6278,6 +6278,13 @@ static int dahdi_chan_ioctl(struct file *file, unsigned int cmd, unsigned long d
}
break;
#endif
case DAHDI_BUFFER_EVENTS:
if (get_user(j, (int __user *)data) != -EFAULT && j)
set_bit(DAHDI_FLAGBIT_BUFEVENTS, &chan->flags);
else
clear_bit(DAHDI_FLAGBIT_BUFEVENTS, &chan->flags);
break;
default:
return dahdi_chanandpseudo_ioctl(file, cmd, data);
}
@ -7060,6 +7067,7 @@ static inline void __dahdi_getbuf_chunk(struct dahdi_chan *ss, unsigned char *tx
int getlin;
/* How many bytes we need to process */
int bytes = DAHDI_CHUNKSIZE, left;
bool needtxunderrun = false;
int x;
/* Let's pick something to transmit. First source to
@ -7201,13 +7209,25 @@ out in the later versions, and is put back now. */
} else {
memset(txb, 0xFF, bytes);
}
needtxunderrun += bytes;
bytes = 0;
} else {
memset(txb, DAHDI_LIN2X(0, ms), bytes); /* Lastly we use silence on telephony channels */
needtxunderrun += bytes;
bytes = 0;
}
}
if (needtxunderrun) {
if (!test_bit(DAHDI_FLAGBIT_TXUNDERRUN, &ms->flags)) {
if (test_bit(DAHDI_FLAGBIT_BUFEVENTS, &ms->flags))
__qevent(ms, DAHDI_EVENT_WRITE_UNDERRUN);
set_bit(DAHDI_FLAGBIT_TXUNDERRUN, &ms->flags);
}
} else {
clear_bit(DAHDI_FLAGBIT_TXUNDERRUN, &ms->flags);
}
#ifdef CONFIG_DAHDI_MIRROR
if (ss->txmirror) {
spin_lock(&ss->txmirror->lock);
@ -8383,6 +8403,15 @@ that the waitqueue is empty. */
#endif
}
if (bytes) {
if (!test_bit(DAHDI_FLAGBIT_RXOVERRUN, &ms->flags)) {
if (test_bit(DAHDI_FLAGBIT_BUFEVENTS, &ms->flags))
__qevent(ms, DAHDI_EVENT_READ_OVERRUN);
set_bit(DAHDI_FLAGBIT_RXOVERRUN, &ms->flags);
}
} else {
clear_bit(DAHDI_FLAGBIT_RXOVERRUN, &ms->flags);
}
}
static inline void __dahdi_putbuf_chunk(struct dahdi_chan *ss, unsigned char *rxb)

6
include/dahdi/kernel.h
View File

@ -719,6 +719,9 @@ enum {
DAHDI_FLAGBIT_LOOPED = 18, /*!< Loopback the receive data from the channel to the transmit */
DAHDI_FLAGBIT_MTP2 = 19, /*!< Repeats last message in buffer and also discards repeating messages sent to us */
DAHDI_FLAGBIT_HDLC56 = 20, /*!< Sets the given channel (if in HDLC mode) to use 56K HDLC instead of 64K */
DAHDI_FLAGBIT_BUFEVENTS = 21, /*!< Report buffer events */
DAHDI_FLAGBIT_TXUNDERRUN = 22, /*!< Transmit underrun condition */
DAHDI_FLAGBIT_RXOVERRUN = 23, /*!< Receive overrun condition */
DAHDI_FLAGBIT_DEVFILE = 25, /*!< Channel has a sysfs dev file */
};
@ -783,6 +786,9 @@ struct dahdi_count {
#define DAHDI_FLAG_LOOPED DAHDI_FLAG(LOOPED)
#define DAHDI_FLAG_MTP2 DAHDI_FLAG(MTP2)
#define DAHDI_FLAG_HDLC56 DAHDI_FLAG(HDLC56)
#define DAHDI_FLAG_BUFEVENTS DAHDI_FLAG(BUFEVENTS)
#define DAHDI_FLAG_TXUNDERRUN DAHDI_FLAG(TXUNDERRUN)
#define DAHDI_FLAG_RXOVERRUN DAHDI_FLAG(RXOVERRUN)
struct dahdi_span_ops {
struct module *owner; /*!< Which module is exporting this span. */

13
include/dahdi/user.h
View File

@ -448,6 +448,12 @@ enum dahdi_maint_mode {
/* The echo canceler's NLP (only) was enabled */
#define DAHDI_EVENT_EC_NLP_ENABLED 28
/* The channel's read buffer encountered an overrun condition */
#define DAHDI_EVENT_READ_OVERRUN 29
/* The channel's write buffer encountered an underrun condition */
#define DAHDI_EVENT_WRITE_UNDERRUN 30
#define DAHDI_EVENT_PULSEDIGIT (1 << 16) /* This is OR'd with the digit received */
#define DAHDI_EVENT_DTMFDOWN (1 << 17) /* Ditto for DTMF key down event */
#define DAHDI_EVENT_DTMFUP (1 << 18) /* Ditto for DTMF key up event */
@ -1085,6 +1091,13 @@ struct dahdi_vmwi_info {
#define DAHDI_TXMIRROR _IOW(DAHDI_CODE, 104, int)
#endif /* CONFIG_DAHDI_MIRROR */
/*
Set the desired state for channel buffer event generation which is disabled
by default to allow for backwards compatibility for dumb users of channels
such as pattern utilities.
*/
#define DAHDI_BUFFER_EVENTS _IOW(DAHDI_CODE, 105, int)
/* Get current status IOCTL */
/* Defines for Radio Status (dahdi_radio_stat.radstat) bits */