Add RPMsg API to get buffer size #565
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arnopo
reviewed
Mar 18, 2024
| @@ -121,21 +131,12 @@ int app (struct rpmsg_device *rdev, void *priv) | |||
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| if (!i_payload) { | |||
| LPERROR("memory allocation failed.\r\n"); | |||
| rpmsg_destroy_ept(&lept); | |||
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reviewing the code I just see that an error returned rpmsg_send error not return a test failed. t
Could you also fix that by managing a ret variable and using go out?
if (!i_payload) {
LPERROR("memory allocation failed.\r\n");
ret = -1;
goto out;
}
[...]
if (ret) {
LPERROR("Failed to create RPMsg endpoint.\r\n");
ret = -1;
goto free_mem:
}
[...]
free_mem:
metal_free_memory(i_payload);
out:
LPRINTF("**********************************\r\n");
LPRINTF(" Test Results: Error count = %d \r\n", err_cnt);
LPRINTF("**********************************\r\n");
/* Destroy the RPMsg endpoint */
rpmsg_destroy_ept(&lept);
LPRINTF("Quitting application .. Echo test end\r\n");
return ret;
}
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I looked into that and it will introduce more churn than I'd think should be part of this series. Would it be better to address that issue in a separate PR?
Add an RPMsg API to get the buffer sizes supported by the backing transport layer. Add hooks so that transport layers can register functions to provide this data. Signed-off-by: Andrew Davis <[email protected]>
RPMsg provides functions to get a transport's backing buffer sizes. Connect this up for the virtio transport here. Signed-off-by: Andrew Davis <[email protected]>
The contents of app() in these examples is given a rpmsg_device. We should not have to know about the backing transport layer. We assume it is virtio and call into the virtio layer to get the buffer size. This information is now available from the rpmsg layer. Use those functions to make the app() agnostic to the backing layer. Signed-off-by: Andrew Davis <[email protected]>
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xiaoxiang781216
approved these changes
Apr 2, 2024
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In patch 3 of this series you can see core of the issue, applications have no way of finding if the transport layer under RPMsg has a maximum supported message size. The examples end up having to look directly into the transport layer to find this info. With this API they can ask the RPMsg layer without having to know about the backing transport layer. This is better API layering and allows the core of the examples to work across any transport layer.