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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
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@@ -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