change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/drivers/rpmsg/virtio_rpmsg_bus.c
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@@ -181,6 +181,7 @@
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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 const struct rpmsg_endpoint_ops virtio_endpoint_ops = {
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 	.destroy_ept = virtio_rpmsg_destroy_ept,
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@@ -190,6 +191,7 @@
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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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@@ -705,6 +707,14 @@
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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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+
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+	return vch->vrp->buf_size - sizeof(struct rpmsg_hdr);
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+}
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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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 {