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caif_virtio: Introduce caif over virtio

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Add the CAIF Virtio shared memory driver for talking
to a modem.

This CAIF Link layer communicates to the modem over
shared memory. It is implemented as a virtio_driver.
The underlying virtio device is managed by the remoteproc
framework. The Virtio queue is used for transmitting data
to the modem, and the new vringh is used for receiving data.

Genalloc is used for managing the shared memory used for TX
data. The default dma-alloc-coherent allocator can only
allocate whole pages, and this wastes too much shared memory.

Flow control is implemented by stopping the TX-queues if the
virtio queues go full or we run out of memory. Queued are
reopened when queues are below the watermark.

NAPI is used in RX path, and a dedicated tasklet is used
for releasing TX buffers.

Signed-off-by: Erwan Yvin <erwan.yvin@stericsson.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (minor fixes)
This commit is contained in:
Erwan Yvin
2013-03-20 13:52:24 +10:30
committed by Rusty Russell
parent 3beee86a4b
commit 0d2e1a2926
5 changed files with 827 additions and 0 deletions
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14
drivers/net/caif/Kconfig
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@@ -47,3 +47,17 @@ config CAIF_HSI
The caif low level driver for CAIF over HSI.
Be aware that if you enable this then you also need to
enable a low-level HSI driver.
config CAIF_VIRTIO
tristate "CAIF virtio transport driver"
depends on CAIF
select VHOST_RING
select VIRTIO
select GENERIC_ALLOCATOR
default n
---help---
The caif driver for CAIF over Virtio.
if CAIF_VIRTIO
source "drivers/vhost/Kconfig"
endif

3
drivers/net/caif/Makefile
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@@ -13,3 +13,6 @@ obj-$(CONFIG_CAIF_SHM) += caif_shm.o
# HSI interface
obj-$(CONFIG_CAIF_HSI) += caif_hsi.o
# Virtio interface
obj-$(CONFIG_CAIF_VIRTIO) += caif_virtio.o

785
drivers/net/caif/caif_virtio.c Normal file
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File diff suppressed because it is too large Load Diff

24
include/linux/virtio_caif.h Normal file
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@@ -0,0 +1,24 @@
/*
* Copyright (C) ST-Ericsson AB 2012
* Author: Sjur Brændeland <sjur.brandeland@stericsson.com>
*
* This header is BSD licensed so
* anyone can use the definitions to implement compatible remote processors
*/
#ifndef VIRTIO_CAIF_H
#define VIRTIO_CAIF_H
#include <linux/types.h>
struct virtio_caif_transf_config {
u16 headroom;
u16 tailroom;
u32 mtu;
u8 reserved[4];
};
struct virtio_caif_config {
struct virtio_caif_transf_config uplink, downlink;
u8 reserved[8];
};
#endif

1
include/uapi/linux/virtio_ids.h
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@@ -38,5 +38,6 @@
#define VIRTIO_ID_SCSI 8 /* virtio scsi */
#define VIRTIO_ID_9P 9 /* 9p virtio console */
#define VIRTIO_ID_RPROC_SERIAL 11 /* virtio remoteproc serial link */
#define VIRTIO_ID_CAIF 12 /* Virtio caif */
#endif /* _LINUX_VIRTIO_IDS_H */