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pstream: Support memfd blocks transport

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Now that we have the necessary infrastructure to memexport and
mempimport a memfd memblock, extend that support higher up in the
chain with pstreams.

A PA endpoint can now _transparently_ send a memfd memblock to the
other end by simply calling pa_pstream_send_memblock() – provided
the block's memfd pool was earlier registered with the pstream.

If the pipe does not support memfd transfers, we fall back to
sending the block's full data instead of just its reference.

** Further details:

A single pstream connection usually transfers blocks from multiple
pools including the server's srbchannel mempool, the client's
audio data mempool, and the server's global core mempool.

If these mempools are memfd-backed, we now require registering
them with the pstream before sending any blocks they cover. This
is done to minimize fd passing overhead and avoid fd leaks.

Moreover, to support all these pools without hard-coding their
number or nature in the Pulse communication protocol itself, a new
REGISTER_MEMFD_SHMID command is introduced. That command can be
sent _anytime_ during the pstream's lifetime and is used for
creating on demand SHM ID to memfd mappings.

Suggested-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
This commit is contained in:
Ahmed S. Darwish 2016-03-13 01:12:18 +02:00 • committed by David Henningsson
parent ee2db62277
commit 27d0a3b388
17 changed files with 455 additions and 76 deletions
Download patch file Download diff file Expand all files Collapse all files

8
src/pulsecore/pstream.h
View file

@ -36,7 +36,7 @@
typedef struct pa_pstream pa_pstream;
typedef void (*pa_pstream_packet_cb_t)(pa_pstream *p, pa_packet *packet, const pa_cmsg_ancil_data *ancil_data, void *userdata);
typedef void (*pa_pstream_packet_cb_t)(pa_pstream *p, pa_packet *packet, pa_cmsg_ancil_data *ancil_data, void *userdata);
typedef void (*pa_pstream_memblock_cb_t)(pa_pstream *p, uint32_t channel, int64_t offset, pa_seek_mode_t seek, const pa_memchunk *chunk, void *userdata);
typedef void (*pa_pstream_notify_cb_t)(pa_pstream *p, void *userdata);
typedef void (*pa_pstream_block_id_cb_t)(pa_pstream *p, uint32_t block_id, void *userdata);
@ -48,7 +48,9 @@ void pa_pstream_unref(pa_pstream*p);
void pa_pstream_unlink(pa_pstream *p);
void pa_pstream_send_packet(pa_pstream*p, pa_packet *packet, const pa_cmsg_ancil_data *ancil_data);
int pa_pstream_attach_memfd_shmid(pa_pstream *p, unsigned shm_id, int memfd_fd);
void pa_pstream_send_packet(pa_pstream*p, pa_packet *packet, pa_cmsg_ancil_data *ancil_data);
void pa_pstream_send_memblock(pa_pstream*p, uint32_t channel, int64_t offset, pa_seek_mode_t seek, const pa_memchunk *chunk);
void pa_pstream_send_release(pa_pstream *p, uint32_t block_id);
void pa_pstream_send_revoke(pa_pstream *p, uint32_t block_id);
@ -63,7 +65,9 @@ void pa_pstream_set_revoke_callback(pa_pstream *p, pa_pstream_block_id_cb_t cb,
bool pa_pstream_is_pending(pa_pstream *p);
void pa_pstream_enable_shm(pa_pstream *p, bool enable);
void pa_pstream_enable_memfd(pa_pstream *p);
bool pa_pstream_get_shm(pa_pstream *p);
bool pa_pstream_get_memfd(pa_pstream *p);
/* Enables shared ringbuffer channel. Note that the srbchannel is now owned by the pstream.
Setting srb to NULL will free any existing srbchannel. */