Re: [PATCH net-next v3] atl1c: add 4 RX/TX queue support for Mikrotik 10/25G NIC

[Gatis Peisenieks]

On 2021-05-27 04:16, Jakub Kicinski wrote:
> > +/**
> > + * atl1c_clean_rx - NAPI Rx polling callback
> > + * @napi: napi info
> > + * @budget: limit of packets to clean
> > + */
> > +static int atl1c_clean_rx(struct napi_struct *napi, int budget)
> >  {
> > +	struct atl1c_rrd_ring *rrd_ring =
> > +		container_of(napi, struct atl1c_rrd_ring, napi);
> > +	struct atl1c_adapter *adapter = rrd_ring->adapter;
> > +	int work_done = 0;
> > +	unsigned long flags;
> >  	u16 rfd_num, rfd_index;
> > -	u16 count = 0;
> >  	u16 length;
> >  	struct pci_dev *pdev = adapter->pdev;
> >  	struct net_device *netdev  = adapter->netdev;
> > -	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring;
> > -	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring;
> > +	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring[rrd_ring->num];
> >  	struct sk_buff *skb;
> >  	struct atl1c_recv_ret_status *rrs;
> >  	struct atl1c_buffer *buffer_info;
> >
> > +	/* Keep link state information with original netdev */
> > +	if (!netif_carrier_ok(adapter->netdev))
> > +		goto quit_polling;
>
> Interesting, I see you only move this code, but why does this driver
> stop reading packets when link goes down? Surely there may be packets
> already on the ring which Linux should process?

Jakub, I do not know what possible HW quirks this check might be
covering up, so I left it there. If you feel it is safe to remove
I can do a separate patch for that. I think it is fine for the
HW I work with, but that is far from everything this driver supports.

Thank you for reviewing this!