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 <[email protected]> --- Changes in v4: - check msg size is < MTU size Changes in v3: - Check for error when retrieving MTU size - %s/mtu/MTU/ samples/rpmsg/rpmsg_client_sample.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/samples/rpmsg/rpmsg_client_sample.c b/samples/rpmsg/rpmsg_client_sample.c index ae5081662283..4c43436aadb6 100644 --- a/samples/rpmsg/rpmsg_client_sample.c +++ b/samples/rpmsg/rpmsg_client_sample.c @@ -52,6 +52,7 @@ static int rpmsg_sample_probe(struct rpmsg_device *rpdev) { int ret; struct instance_data *idata; + ssize_t mtu, msg_len; dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n", rpdev->src, rpdev->dst); @@ -62,8 +63,25 @@ static int rpmsg_sample_probe(struct rpmsg_device *rpdev) 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 */ - ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG)); + ret = rpmsg_send(rpdev->ept, MSG, msg_len); if (ret) { dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret); return ret; -- 2.34.1
