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samples: rpmsg: Add MTU size info

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RPMsg MTU size can be variable now and no longer hardcoded to 512 bytes.
Add log to the sample driver that prints current MTU size of the rpmsg
buffer.

Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
Acked-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Link: https://lore.kernel.org/r/20260828145853.2843486-6-tanmay.shah@amd.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
This commit is contained in:
Tanmay Shah 2026-08-28 07:58:52 -07:00 committed by Mathieu Poirier
parent 079844f735
commit 1029c89baf
1 changed files with 19 additions and 1 deletions
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20
samples/rpmsg/rpmsg_client_sample.c
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@ -52,6 +52,7 @@ static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
{ {
int ret; int ret;
struct instance_data *idata; struct instance_data *idata;
ssize_t mtu, msg_len;
dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n", dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
rpdev->src, rpdev->dst); rpdev->src, rpdev->dst);
@ -62,8 +63,25 @@ static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
dev_set_drvdata(&rpdev->dev, idata); dev_set_drvdata(&rpdev->dev, idata);
mtu = rpmsg_get_mtu(rpdev->ept);
if (mtu < 0) {
dev_warn(&rpdev->dev, "invalid rpmsg MTU size = %ld\n", mtu);
return mtu;
}
dev_info(&rpdev->dev, "rpmsg MTU size = %ld\n", mtu);
msg_len = strlen(MSG);
/* make sure our message fits in a single rpmsg buffer */
if (msg_len > mtu) {
dev_err(&rpdev->dev,
"message size %zu exceeds rpmsg MTU size %ld\n",
strlen(MSG), mtu);
return -EMSGSIZE;
}
/* send a message to our remote processor */ /* send a message to our remote processor */
ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG)); ret = rpmsg_send(rpdev->ept, MSG, msg_len);
if (ret) { if (ret) {
dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret); dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
return ret; return ret;