[riot-notifications] [RIOT-OS/RIOT] gnrc_netif: add packet to queue when device is busy (#11263)

Kaspar Schleiser notifications at github.com
Tue Mar 26 09:44:11 CET 2019

kaspar030 requested changes on this pull request.

> @@ -1411,21 +1441,27 @@ static void _event_cb(netdev_t *dev, netdev_event_t event)
         gnrc_pktsnip_t *pkt = NULL;
         switch (event) {
             case NETDEV_EVENT_RX_COMPLETE:
+                _send_queued_pkt(netif);

This seems problematic to me.
For one, it is completely surprising to see this here, without the context of why this PR exists in the first place.

The other problem would be that this basically requires the network device to keep the just received packet "on hold", send a queued packet, and only then get the held packet out of the device. I don't think all devices allow that.

I'm not sure, this might be solved by getting the received packet first, then initiating the send. E.g., swap 1444 and 1445. A downside would be that both packets need to be in memory at the same time, but I suspect that otherwise, the device needs to provide extra buffering...

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