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SubjectRe: [PATCH net-next 06/15] net: sgi: ioc3-eth: get rid of ioc3_clean_rx_ring()
On Wed, 28 Aug 2019 16:02:46 -0700
Jakub Kicinski <jakub.kicinski@netronome.com> wrote:

> On Wed, 28 Aug 2019 16:03:05 +0200, Thomas Bogendoerfer wrote:
> > Clean rx ring is just called once after a new ring is allocated, which
> > is per definition clean. So there is not need for this function.
> >
> > Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
> > ---
> > drivers/net/ethernet/sgi/ioc3-eth.c | 21 ---------------------
> > 1 file changed, 21 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
> > index 6ca560d4ab79..39631e067b71 100644
> > --- a/drivers/net/ethernet/sgi/ioc3-eth.c
> > +++ b/drivers/net/ethernet/sgi/ioc3-eth.c
> > @@ -761,26 +761,6 @@ static void ioc3_mii_start(struct ioc3_private *ip)
> > add_timer(&ip->ioc3_timer);
> > }
> >
> > -static inline void ioc3_clean_rx_ring(struct ioc3_private *ip)
> > -{
> > - struct ioc3_erxbuf *rxb;
> > - struct sk_buff *skb;
> > - int i;
> > -
> > - for (i = ip->rx_ci; i & 15; i++) {
> > - ip->rx_skbs[ip->rx_pi] = ip->rx_skbs[ip->rx_ci];
> > - ip->rxr[ip->rx_pi++] = ip->rxr[ip->rx_ci++];
> > - }
> > - ip->rx_pi &= RX_RING_MASK;
> > - ip->rx_ci &= RX_RING_MASK;
> > -
> > - for (i = ip->rx_ci; i != ip->rx_pi; i = (i + 1) & RX_RING_MASK) {
> > - skb = ip->rx_skbs[i];
> > - rxb = (struct ioc3_erxbuf *)(skb->data - RX_OFFSET);
> > - rxb->w0 = 0;
>
> There's gotta be some purpose to setting this w0 word to zero no?
> ioc3_rx() uses that to see if the descriptor is done, and dutifully
> clears it after..

you are right. I thought this is already done in alloc_rx_bufs, but it isn't.
I'll add it there and put it into this patch. /me wonders why testing
didn't show this...

Thomas.

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