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Date: Fri, 7 Apr 2017 10:57:09 +0200
From: Tobias Klauser <tklauser@...tanz.ch>
To: Nicolas Ferre <nicolas.ferre@...rochip.com>
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH net-next 05/14] net: macb: Use net_device_stats from
struct net_device
On 2017-04-07 at 10:29:34 +0200, Nicolas Ferre <nicolas.ferre@...rochip.com> wrote:
> Le 07/04/2017 à 10:17, Tobias Klauser a écrit :
> > Instead of using a private copy of struct net_device_stats in struct
> > macb, use stats from struct net_device.
>
> I agree with the initiative but I read this in the documentation of this
> struct member...
>
> @stats: Statistics struct, which was left as a legacy, use
> rtnl_link_stats64 instead
Seems I haven't read the comments for this struct member in a long time.
Thanks for the hint :)
> Is it still permitted to use it? Would it be to directly move to the
> most up-to-date code?
With a quick git/google search I couldn't really find any information on
why net_device_stats was deemed legacy and whether it is still allowed
to be used. It seems the comment saying so was introduced in
536721b1cb3f ("net: kernel-doc compliant documentation for net_device")
but neither the log message specifies nor the mailing list thread
provide any further information.
In any case I'd say it's still better to use the one provided by
struct net_device rather than introducing a copy.
And certainly, switching to use rtnl_link_stats64 would even be better.
I can try to come up with a patch but I'm not really sure what the
preferred method to store these stats is. Should the driver define its
own struct with the counters it is interested in and then copy it to
rtnl_link_stats64 in .ndo_get_stats (which is what most drivers not
having HW counter register seem to be doing)? Or should a copy of
rtnl_link_stats64 be included in the netdev_priv data?
Thanks
> Regards,
>
>
> > Cc: Nicolas Ferre <nicolas.ferre@...el.com>
> > Signed-off-by: Tobias Klauser <tklauser@...tanz.ch>
> > ---
> > drivers/net/ethernet/cadence/macb.c | 40 ++++++++++++++++++-------------------
> > drivers/net/ethernet/cadence/macb.h | 1 -
> > 2 files changed, 20 insertions(+), 21 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
> > index 30606b11b128..5cbd1e7a926a 100644
> > --- a/drivers/net/ethernet/cadence/macb.c
> > +++ b/drivers/net/ethernet/cadence/macb.c
> > @@ -684,8 +684,8 @@ static void macb_tx_error_task(struct work_struct *work)
> > netdev_vdbg(bp->dev, "txerr skb %u (data %p) TX complete\n",
> > macb_tx_ring_wrap(bp, tail),
> > skb->data);
> > - bp->stats.tx_packets++;
> > - bp->stats.tx_bytes += skb->len;
> > + bp->dev->stats.tx_packets++;
> > + bp->dev->stats.tx_bytes += skb->len;
> > }
> > } else {
> > /* "Buffers exhausted mid-frame" errors may only happen
> > @@ -778,8 +778,8 @@ static void macb_tx_interrupt(struct macb_queue *queue)
> > netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n",
> > macb_tx_ring_wrap(bp, tail),
> > skb->data);
> > - bp->stats.tx_packets++;
> > - bp->stats.tx_bytes += skb->len;
> > + bp->dev->stats.tx_packets++;
> > + bp->dev->stats.tx_bytes += skb->len;
> > }
> >
> > /* Now we can safely release resources */
> > @@ -911,14 +911,14 @@ static int gem_rx(struct macb *bp, int budget)
> > if (!(ctrl & MACB_BIT(RX_SOF) && ctrl & MACB_BIT(RX_EOF))) {
> > netdev_err(bp->dev,
> > "not whole frame pointed by descriptor\n");
> > - bp->stats.rx_dropped++;
> > + bp->dev->stats.rx_dropped++;
> > break;
> > }
> > skb = bp->rx_skbuff[entry];
> > if (unlikely(!skb)) {
> > netdev_err(bp->dev,
> > "inconsistent Rx descriptor chain\n");
> > - bp->stats.rx_dropped++;
> > + bp->dev->stats.rx_dropped++;
> > break;
> > }
> > /* now everything is ready for receiving packet */
> > @@ -938,8 +938,8 @@ static int gem_rx(struct macb *bp, int budget)
> > GEM_BFEXT(RX_CSUM, ctrl) & GEM_RX_CSUM_CHECKED_MASK)
> > skb->ip_summed = CHECKSUM_UNNECESSARY;
> >
> > - bp->stats.rx_packets++;
> > - bp->stats.rx_bytes += skb->len;
> > + bp->dev->stats.rx_packets++;
> > + bp->dev->stats.rx_bytes += skb->len;
> >
> > #if defined(DEBUG) && defined(VERBOSE_DEBUG)
> > netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
> > @@ -984,7 +984,7 @@ static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
> > */
> > skb = netdev_alloc_skb(bp->dev, len + NET_IP_ALIGN);
> > if (!skb) {
> > - bp->stats.rx_dropped++;
> > + bp->dev->stats.rx_dropped++;
> > for (frag = first_frag; ; frag++) {
> > desc = macb_rx_desc(bp, frag);
> > desc->addr &= ~MACB_BIT(RX_USED);
> > @@ -1030,8 +1030,8 @@ static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
> > __skb_pull(skb, NET_IP_ALIGN);
> > skb->protocol = eth_type_trans(skb, bp->dev);
> >
> > - bp->stats.rx_packets++;
> > - bp->stats.rx_bytes += skb->len;
> > + bp->dev->stats.rx_packets++;
> > + bp->dev->stats.rx_bytes += skb->len;
> > netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
> > skb->len, skb->csum);
> > netif_receive_skb(skb);
> > @@ -2210,7 +2210,7 @@ static void gem_update_stats(struct macb *bp)
> > static struct net_device_stats *gem_get_stats(struct macb *bp)
> > {
> > struct gem_stats *hwstat = &bp->hw_stats.gem;
> > - struct net_device_stats *nstat = &bp->stats;
> > + struct net_device_stats *nstat = &bp->dev->stats;
> >
> > gem_update_stats(bp);
> >
> > @@ -2281,7 +2281,7 @@ static void gem_get_ethtool_strings(struct net_device *dev, u32 sset, u8 *p)
> > static struct net_device_stats *macb_get_stats(struct net_device *dev)
> > {
> > struct macb *bp = netdev_priv(dev);
> > - struct net_device_stats *nstat = &bp->stats;
> > + struct net_device_stats *nstat = &bp->dev->stats;
> > struct macb_stats *hwstat = &bp->hw_stats.macb;
> >
> > if (macb_is_gem(bp))
> > @@ -2993,15 +2993,15 @@ static void at91ether_rx(struct net_device *dev)
> > memcpy(skb_put(skb, pktlen), p_recv, pktlen);
> >
> > skb->protocol = eth_type_trans(skb, dev);
> > - lp->stats.rx_packets++;
> > - lp->stats.rx_bytes += pktlen;
> > + dev->stats.rx_packets++;
> > + dev->stats.rx_bytes += pktlen;
> > netif_rx(skb);
> > } else {
> > - lp->stats.rx_dropped++;
> > + dev->stats.rx_dropped++;
> > }
> >
> > if (desc->ctrl & MACB_BIT(RX_MHASH_MATCH))
> > - lp->stats.multicast++;
> > + dev->stats.multicast++;
> >
> > /* reset ownership bit */
> > desc->addr &= ~MACB_BIT(RX_USED);
> > @@ -3036,15 +3036,15 @@ static irqreturn_t at91ether_interrupt(int irq, void *dev_id)
> > if (intstatus & MACB_BIT(TCOMP)) {
> > /* The TCOM bit is set even if the transmission failed */
> > if (intstatus & (MACB_BIT(ISR_TUND) | MACB_BIT(ISR_RLE)))
> > - lp->stats.tx_errors++;
> > + dev->stats.tx_errors++;
> >
> > if (lp->skb) {
> > dev_kfree_skb_irq(lp->skb);
> > lp->skb = NULL;
> > dma_unmap_single(NULL, lp->skb_physaddr,
> > lp->skb_length, DMA_TO_DEVICE);
> > - lp->stats.tx_packets++;
> > - lp->stats.tx_bytes += lp->skb_length;
> > + dev->stats.tx_packets++;
> > + dev->stats.tx_bytes += lp->skb_length;
> > }
> > netif_wake_queue(dev);
> > }
> > diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
> > index 234a49eaccfd..ec037b0fa2a4 100644
> > --- a/drivers/net/ethernet/cadence/macb.h
> > +++ b/drivers/net/ethernet/cadence/macb.h
> > @@ -919,7 +919,6 @@ struct macb {
> > struct clk *rx_clk;
> > struct net_device *dev;
> > struct napi_struct napi;
> > - struct net_device_stats stats;
> > union {
> > struct macb_stats macb;
> > struct gem_stats gem;
> >
>
>
> --
> Nicolas Ferre
>
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