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rpmsg: core: add API to get MTU
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>
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@ -327,6 +327,27 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
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}
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EXPORT_SYMBOL(rpmsg_trysend_offchannel);
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/**
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* rpmsg_get_mtu() - get maximum transmission buffer size for sending message.
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* @ept: the rpmsg endpoint
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*
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* This function returns maximum buffer size available for a single outgoing message.
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*
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* Return: the maximum transmission size on success and an appropriate error
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* value on failure.
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*/
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ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept)
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{
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if (WARN_ON(!ept))
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return -EINVAL;
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if (!ept->ops->get_mtu)
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return -ENOTSUPP;
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return ept->ops->get_mtu(ept);
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}
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EXPORT_SYMBOL(rpmsg_get_mtu);
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/*
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* match a rpmsg channel with a channel info struct.
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* this is used to make sure we're not creating rpmsg devices for channels
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@ -53,6 +53,7 @@ struct rpmsg_device_ops {
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* @trysendto: see @rpmsg_trysendto(), optional
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* @trysend_offchannel: see @rpmsg_trysend_offchannel(), optional
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* @poll: see @rpmsg_poll(), optional
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* @get_mtu: see @rpmsg_get_mtu(), optional
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*
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* Indirection table for the operations that a rpmsg backend should implement.
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* In addition to @destroy_ept, the backend must at least implement @send and
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@ -72,6 +73,7 @@ struct rpmsg_endpoint_ops {
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void *data, int len);
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__poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp,
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poll_table *wait);
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ssize_t (*get_mtu)(struct rpmsg_endpoint *ept);
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};
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struct device *rpmsg_find_device(struct device *parent,
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@ -149,6 +149,7 @@ static int virtio_rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
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int len, u32 dst);
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static int virtio_rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src,
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u32 dst, void *data, int len);
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static ssize_t virtio_rpmsg_get_mtu(struct rpmsg_endpoint *ept);
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static struct rpmsg_device *__rpmsg_create_channel(struct virtproc_info *vrp,
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struct rpmsg_channel_info *chinfo);
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@ -160,6 +161,7 @@ static const struct rpmsg_endpoint_ops virtio_endpoint_ops = {
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.trysend = virtio_rpmsg_trysend,
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.trysendto = virtio_rpmsg_trysendto,
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.trysend_offchannel = virtio_rpmsg_trysend_offchannel,
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.get_mtu = virtio_rpmsg_get_mtu,
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};
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/**
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@ -696,6 +698,14 @@ static int virtio_rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src,
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return rpmsg_send_offchannel_raw(rpdev, src, dst, data, len, false);
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}
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static ssize_t virtio_rpmsg_get_mtu(struct rpmsg_endpoint *ept)
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{
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struct rpmsg_device *rpdev = ept->rpdev;
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struct virtio_rpmsg_channel *vch = to_virtio_rpmsg_channel(rpdev);
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return vch->vrp->buf_size - sizeof(struct rpmsg_hdr);
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}
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static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,
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struct rpmsg_hdr *msg, unsigned int len)
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{
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@ -186,6 +186,8 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
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__poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
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poll_table *wait);
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ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept);
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#else
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static inline int rpmsg_register_device(struct rpmsg_device *rpdev)
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@ -296,6 +298,14 @@ static inline __poll_t rpmsg_poll(struct rpmsg_endpoint *ept,
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return 0;
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}
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static inline ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept)
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{
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/* This shouldn't be possible */
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WARN_ON(1);
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return -ENXIO;
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}
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#endif /* IS_ENABLED(CONFIG_RPMSG) */
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/* use a macro to avoid include chaining to get THIS_MODULE */
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