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rpmsg: core: add API to get MTU

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Return the rpmsg buffer MTU for sending message, so rpmsg users
can split a long message in several sub rpmsg buffers.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Link: https://lore.kernel.org/r/20211015094701.5732-2-arnaud.pouliquen@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnaud Pouliquen 2021-10-15 11:47:00 +02:00 committed by Greg Kroah-Hartman
parent 74365bc138
commit e279317e9a
4 changed files with 43 additions and 0 deletions
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21
drivers/rpmsg/rpmsg_core.c
View File

@ -327,6 +327,27 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
}
EXPORT_SYMBOL(rpmsg_trysend_offchannel);
/**
* rpmsg_get_mtu() - get maximum transmission buffer size for sending message.
* @ept: the rpmsg endpoint
*
* This function returns maximum buffer size available for a single outgoing message.
*
* Return: the maximum transmission size on success and an appropriate error
* value on failure.
*/
ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept)
{
if (WARN_ON(!ept))
return -EINVAL;
if (!ept->ops->get_mtu)
return -ENOTSUPP;
return ept->ops->get_mtu(ept);
}
EXPORT_SYMBOL(rpmsg_get_mtu);
/*
* match a rpmsg channel with a channel info struct.
* this is used to make sure we're not creating rpmsg devices for channels

2
drivers/rpmsg/rpmsg_internal.h
View File

@ -53,6 +53,7 @@ struct rpmsg_device_ops {
* @trysendto: see @rpmsg_trysendto(), optional
* @trysend_offchannel: see @rpmsg_trysend_offchannel(), optional
* @poll: see @rpmsg_poll(), optional
* @get_mtu: see @rpmsg_get_mtu(), optional
*
* Indirection table for the operations that a rpmsg backend should implement.
* In addition to @destroy_ept, the backend must at least implement @send and
@ -72,6 +73,7 @@ struct rpmsg_endpoint_ops {
void *data, int len);
__poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp,
poll_table *wait);
ssize_t (*get_mtu)(struct rpmsg_endpoint *ept);
};
struct device *rpmsg_find_device(struct device *parent,

10
drivers/rpmsg/virtio_rpmsg_bus.c
View File

@ -149,6 +149,7 @@ static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
int len, u32 dst);
static int virtio_rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src,
u32 dst, void *data, int len);
static ssize_t virtio_rpmsg_get_mtu(struct rpmsg_endpoint *ept);
static struct rpmsg_device *__rpmsg_create_channel(struct virtproc_info *vrp,
struct rpmsg_channel_info *chinfo);
@ -160,6 +161,7 @@ static const struct rpmsg_endpoint_ops virtio_endpoint_ops = {
.trysend = virtio_rpmsg_trysend,
.trysendto = virtio_rpmsg_trysendto,
.trysend_offchannel = virtio_rpmsg_trysend_offchannel,
.get_mtu = virtio_rpmsg_get_mtu,
};
/**
@ -696,6 +698,14 @@ static int virtio_rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src,
return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
}
static ssize_t virtio_rpmsg_get_mtu(struct rpmsg_endpoint *ept)
{
struct rpmsg_device *rpdev = ept->rpdev;
struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
return vch->vrp->buf_size - sizeof(struct rpmsg_hdr);
}
static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,
struct rpmsg_hdr *msg, unsigned int len)
{

10
include/linux/rpmsg.h
View File

@ -186,6 +186,8 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
__poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
poll_table *wait);
ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept);
#else
static inline int rpmsg_register_device(struct rpmsg_device *rpdev)
@ -296,6 +298,14 @@ static inline __poll_t rpmsg_poll(struct rpmsg_endpoint *ept,
return 0;
}
static inline ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept)
{
/* This shouldn't be possible */
WARN_ON(1);
return -ENXIO;
}
#endif /* IS_ENABLED(CONFIG_RPMSG) */
/* use a macro to avoid include chaining to get THIS_MODULE */