[riot-notifications] [RIOT-OS/RIOT] cpu/sam0: improve ethernet driver resilience (#16683)

Dylan Laduranty notifications at github.com
Mon Jul 26 21:48:34 CEST 2021

### Contribution description
This PR provides a better resilience to the SAM0 ethernet driver in case of heavy traffic in the network.

In some case interrupts fire faster than the netdev thread can process them and we run out of buffers quickly. With this PR, we now check if we don't have buffers available, so we can flush everything and restart reception properly even if we did drop a few in the operation.

### Testing procedure
See #16451 

### Issues/PRs references
Fixes #16451 
Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * cpu/sam0: improve ethernet driver resilience

-- File Changes --

    M cpu/sam0_common/periph/eth.c (35)
    M cpu/sam0_common/sam0_eth/eth-netdev.c (22)

-- Patch Links --


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