netdev - RE: [PATCH V6 3/8] net: sxgbe: add TSO support for Samsung sxgbe

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Date:	Wed, 19 Mar 2014 11:29:40 -0700
From:	Byungho An <bh74.an@...sung.com>
To:	'Rayagond Kokatanur' <rayagond@...avyalabs.com>
Cc:	'netdev' <netdev@...r.kernel.org>,
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
	'David Miller' <davem@...emloft.net>,
	"'ks.giri'" <ks.giri@...sung.com>,
	"'siva.kallam'" <siva.kallam@...sung.com>,
	"'vipul.pandya'" <vipul.pandya@...sung.com>,
	"'ilho215.lee'" <ilho215.lee@...sung.com>
Subject: RE: [PATCH V6 3/8] net: sxgbe: add TSO support for Samsung sxgbe

Rayagond Kokatanur <rayagond@...avyalabs.com> wrote:
> On Wed, Mar 19, 2014 at 11:02 AM, Byungho An <bh74.an@...sung.com> wrote:
[snip]
> >
> >         /* save the skb address */
> >         tqueue->tx_skbuff[entry] = skb;
> >
> >         if (!is_jumbo) {
> > -               tx_desc->tdes01 = dma_map_single(priv->device, skb->data,
> > -                                                  no_pagedlen,
DMA_TO_DEVICE);
> > -               if (dma_mapping_error(priv->device, tx_desc->tdes01))
> > -                       pr_err("%s: TX dma mapping failed!!\n", __func__);
> > -
> > -               priv->hw->desc->prepare_tx_desc(tx_desc, 1, no_pagedlen,
> > -                                               no_pagedlen);
> > +               if (likely(skb_is_gso(skb))) {
> > +                       /* TSO support */
> > +                       mss = skb_shinfo(skb)->gso_size;
> > +
> > + priv->hw->desc->tx_ctxt_desc_set_mss(ctxt_desc, mss);
> 
> No need to issue context descriptor for every TSO packets. Program context
descriptor only if MSS value is value is changed compared
> to previous TSO packet MSS value. By this way we can reduce the one extra
descriptor fetch by device and improve the performance.
OK. This will be applied in the  next post.

[snip]
> > @@ -1893,7 +1943,9 @@ struct sxgbe_priv_data *sxgbe_dvr_probe(struct
> > device *device,
> >
> >         ndev->netdev_ops = &sxgbe_netdev_ops;
> >
> > -       ndev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM;
> > +       ndev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
NETIF_F_IPV6_CSUM |
> > +               NETIF_F_RXCSUM | NETIF_F_TSO | NETIF_F_TSO6 |
> > +               NETIF_F_GRO;
> 
> Enable TSO only if HW supports, hence we have to check for HW
feature/capability registers here also.
OK. Thanks

> 
> >         ndev->features |= ndev->hw_features | NETIF_F_HIGHDMA;
> >         ndev->watchdog_timeo = msecs_to_jiffies(TX_TIMEO);
> >
> > @@ -1905,6 +1957,13 @@ struct sxgbe_priv_data *sxgbe_dvr_probe(struct
device *device,
> >         if (flow_ctrl)
> >                 priv->flow_ctrl = SXGBE_FLOW_AUTO;      /* RX/TX pause on
*/
> >
> > +       /* Enable TCP segmentation offload for all DMA channels */
> > +       if (priv->hw_cap.tcpseg_offload) {
> > +               SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) {
> > +                       priv->hw->dma->enable_tso(priv->ioaddr,
queue_num);
> > +               }
> > +       }
> > +
> >         /* Rx Watchdog is available, enable depend on platform data */
> >         if (!priv->plat->riwt_off) {
> >                 priv->use_riwt = 1;
> > --
> > 1.7.10.4
> >
> >
> > --
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