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ALSA: firewire-lib: split helper function to check incoming CIP header 

A parser for CIP header in incoming packet is enough large.

This commit splits it into a helper function to better looks of packet
handler.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2019-05-22 23:17:06 +09:00 committed by Takashi Iwai
parent 8a400b9996
commit e335425b65
1 changed files with 60 additions and 40 deletions
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100
sound/firewire/amdtp-stream.c
View File

@ -549,29 +549,19 @@ static int handle_out_packet_without_header(struct amdtp_stream *s,
return 0;
}
static int handle_in_packet(struct amdtp_stream *s, unsigned int cycle,
const __be32 *ctx_header, __be32 *buffer,
unsigned int index)
static int check_cip_header(struct amdtp_stream *s, const __be32 *buf,
unsigned int payload_length,
unsigned int *data_blocks, unsigned int *syt)
{
unsigned int payload_length;
u32 cip_header[2];
unsigned int sph, fmt, fdf, syt;
unsigned int data_block_quadlets, data_block_counter, dbc_interval;
unsigned int data_blocks;
struct snd_pcm_substream *pcm;
unsigned int pcm_frames;
unsigned int sph;
unsigned int fmt;
unsigned int fdf;
unsigned int data_block_counter;
bool lost;
payload_length = be32_to_cpu(ctx_header[0]) >> ISO_DATA_LENGTH_SHIFT;
if (payload_length > s->ctx_data.tx.max_payload_length) {
dev_err(&s->unit->device,
"Detect jumbo payload: %04x %04x\n",
payload_length, s->ctx_data.tx.max_payload_length);
return -EIO;
}
cip_header[0] = be32_to_cpu(buffer[0]);
cip_header[1] = be32_to_cpu(buffer[1]);
cip_header[0] = be32_to_cpu(buf[0]);
cip_header[1] = be32_to_cpu(buf[1]);
/*
* This module supports 'Two-quadlet CIP header with SYT field'.
@ -583,9 +573,7 @@ static int handle_in_packet(struct amdtp_stream *s, unsigned int cycle,
dev_info_ratelimited(&s->unit->device,
"Invalid CIP header for AMDTP: %08X:%08X\n",
cip_header[0], cip_header[1]);
data_blocks = 0;
pcm_frames = 0;
goto end;
return -EAGAIN;
}
/* Check valid protocol or not. */
@ -595,19 +583,17 @@ static int handle_in_packet(struct amdtp_stream *s, unsigned int cycle,
dev_info_ratelimited(&s->unit->device,
"Detect unexpected protocol: %08x %08x\n",
cip_header[0], cip_header[1]);
data_blocks = 0;
pcm_frames = 0;
goto end;
return -EAGAIN;
}
/* Calculate data blocks */
fdf = (cip_header[1] & CIP_FDF_MASK) >> CIP_FDF_SHIFT;
if (payload_length < 12 ||
if (payload_length < sizeof(__be32) * 2 ||
(fmt == CIP_FMT_AM && fdf == AMDTP_FDF_NO_DATA)) {
data_blocks = 0;
*data_blocks = 0;
} else {
data_block_quadlets =
(cip_header[0] & CIP_DBS_MASK) >> CIP_DBS_SHIFT;
unsigned int data_block_quadlets =
(cip_header[0] & CIP_DBS_MASK) >> CIP_DBS_SHIFT;
/* avoid division by zero */
if (data_block_quadlets == 0) {
dev_err(&s->unit->device,
@ -618,13 +604,13 @@ static int handle_in_packet(struct amdtp_stream *s, unsigned int cycle,
if (s->flags & CIP_WRONG_DBS)
data_block_quadlets = s->data_block_quadlets;
data_blocks = (payload_length / 4 - 2) /
*data_blocks = (payload_length / sizeof(__be32) - 2) /
data_block_quadlets;
}
/* Check data block counter continuity */
data_block_counter = cip_header[0] & CIP_DBC_MASK;
if (data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) &&
if (*data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) &&
s->data_block_counter != UINT_MAX)
data_block_counter = s->data_block_counter;
@ -635,10 +621,12 @@ static int handle_in_packet(struct amdtp_stream *s, unsigned int cycle,
} else if (!(s->flags & CIP_DBC_IS_END_EVENT)) {
lost = data_block_counter != s->data_block_counter;
} else {
if (data_blocks > 0 && s->ctx_data.tx.dbc_interval > 0)
unsigned int dbc_interval;
if (*data_blocks > 0 && s->ctx_data.tx.dbc_interval > 0)
dbc_interval = s->ctx_data.tx.dbc_interval;
else
dbc_interval = data_blocks;
dbc_interval = *data_blocks;
lost = data_block_counter !=
((s->data_block_counter + dbc_interval) & 0xff);
@ -651,16 +639,48 @@ static int handle_in_packet(struct amdtp_stream *s, unsigned int cycle,
return -EIO;
}
*syt = cip_header[1] & CIP_SYT_MASK;
if (s->flags & CIP_DBC_IS_END_EVENT) {
s->data_block_counter = data_block_counter;
} else {
s->data_block_counter =
(data_block_counter + *data_blocks) & 0xff;
}
return 0;
}
static int handle_in_packet(struct amdtp_stream *s, unsigned int cycle,
const __be32 *ctx_header, __be32 *buffer,
unsigned int index)
{
unsigned int payload_length;
unsigned int syt;
unsigned int data_blocks;
struct snd_pcm_substream *pcm;
unsigned int pcm_frames;
int err;
payload_length = be32_to_cpu(ctx_header[0]) >> ISO_DATA_LENGTH_SHIFT;
if (payload_length > s->ctx_data.tx.max_payload_length) {
dev_err(&s->unit->device,
"Detect jumbo payload: %04x %04x\n",
payload_length, s->ctx_data.tx.max_payload_length);
return -EIO;
}
err = check_cip_header(s, buffer, payload_length, &data_blocks, &syt);
if (err < 0) {
if (err != -EAGAIN)
return err;
pcm_frames = 0;
goto end;
}
trace_amdtp_packet(s, cycle, buffer, payload_length, data_blocks, index);
syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK;
pcm_frames = s->process_data_blocks(s, buffer + 2, data_blocks, &syt);
if (s->flags & CIP_DBC_IS_END_EVENT)
s->data_block_counter = data_block_counter;
else
s->data_block_counter =
(data_block_counter + data_blocks) & 0xff;
end:
if (queue_in_packet(s) < 0)
return -EIO;