RE: [PATCH v2 net] net: enetc: survive memory pressure without crashing

[Claudiu Manoil]

Hi, Vladimir,

> -----Original Message-----
> From: Vladimir Oltean <vladimir.oltean@xxxxxxx>
> Sent: Wednesday, October 26, 2022 3:14 PM
> To: netdev@xxxxxxxxxxxxxxx
[...]
> Subject: [PATCH v2 net] net: enetc: survive memory pressure without crashing
> 
> Under memory pressure, enetc_refill_rx_ring() may fail, and when called
> during the enetc_open() -> enetc_setup_rxbdr() procedure, this is not
> checked for.
> 
> An extreme case of memory pressure will result in exactly zero buffers
> being allocated for the RX ring, and in such a case it is expected that
> hardware drops all RX packets due to lack of buffers.
> 

How do you trigger this "extreme case of memory pressure" where no enetc buffer
can be allocated? Do you simulate it?

Reviewed-by: Claudiu Manoil <claudiu.manoil@xxxxxxx>