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Date:	Tue, 26 Aug 2014 16:51:41 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net: add skb_get_tx_queue() helper

On Tue, Aug 26, 2014 at 2:06 PM, Daniel Borkmann <dborkman@...hat.com> wrote:
> Replace occurences of skb_get_queue_mapping() and follow-up
> netdev_get_tx_queue() with an actual helper function.
>
> Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
> ---
>  include/linux/netdevice.h | 8 ++++++++
>  net/core/netpoll.c        | 2 +-
>  net/core/pktgen.c         | 4 +---
>  net/packet/af_packet.c    | 4 +---
>  net/sched/sch_generic.c   | 6 ++++--
>  5 files changed, 15 insertions(+), 9 deletions(-)
>
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 039b237..200ee4f 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -1747,6 +1747,14 @@ struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
>         return &dev->_tx[index];
>  }
>
> +static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev,
> +                                                   const struct sk_buff *skb)
> +{
> +       u16 index = skb_get_queue_mapping(skb);
> +
> +       return netdev_get_tx_queue(dev, index);
> +}
> +
return netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));

if you want to be a little more concise.

>  static inline void netdev_for_each_tx_queue(struct net_device *dev,
>                                             void (*f)(struct net_device *,
>                                                       struct netdev_queue *,
> diff --git a/net/core/netpoll.c b/net/core/netpoll.c
> index a5ad068..12b1df9 100644
> --- a/net/core/netpoll.c
> +++ b/net/core/netpoll.c
> @@ -115,7 +115,7 @@ static void queue_process(struct work_struct *work)
>                         continue;
>                 }
>
> -               txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
> +               txq = skb_get_tx_queue(dev, skb);
>
>                 local_irq_save(flags);
>                 HARD_TX_LOCK(dev, txq, smp_processor_id());
> diff --git a/net/core/pktgen.c b/net/core/pktgen.c
> index 83e2b4b..d81b540 100644
> --- a/net/core/pktgen.c
> +++ b/net/core/pktgen.c
> @@ -3286,7 +3286,6 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
>  {
>         struct net_device *odev = pkt_dev->odev;
>         struct netdev_queue *txq;
> -       u16 queue_map;
>         int ret;
>
>         /* If device is offline, then don't send */
> @@ -3324,8 +3323,7 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
>         if (pkt_dev->delay && pkt_dev->last_ok)
>                 spin(pkt_dev, pkt_dev->next_tx);
>
> -       queue_map = skb_get_queue_mapping(pkt_dev->skb);
> -       txq = netdev_get_tx_queue(odev, queue_map);
> +       txq = skb_get_tx_queue(odev, pkt_dev->skb);
>
>         local_bh_disable();
>
> diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
> index 0dfa990..b7a7f5a 100644
> --- a/net/packet/af_packet.c
> +++ b/net/packet/af_packet.c
> @@ -243,7 +243,6 @@ static int packet_direct_xmit(struct sk_buff *skb)
>         netdev_features_t features;
>         struct netdev_queue *txq;
>         int ret = NETDEV_TX_BUSY;
> -       u16 queue_map;
>
>         if (unlikely(!netif_running(dev) ||
>                      !netif_carrier_ok(dev)))
> @@ -254,8 +253,7 @@ static int packet_direct_xmit(struct sk_buff *skb)
>             __skb_linearize(skb))
>                 goto drop;
>
> -       queue_map = skb_get_queue_mapping(skb);
> -       txq = netdev_get_tx_queue(dev, queue_map);
> +       txq = skb_get_tx_queue(dev, skb);
>
>         local_bh_disable();
>
> diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
> index fc04fe9..05b3f5d 100644
> --- a/net/sched/sch_generic.c
> +++ b/net/sched/sch_generic.c
> @@ -63,7 +63,7 @@ static inline struct sk_buff *dequeue_skb(struct Qdisc *q)
>
>         if (unlikely(skb)) {
>                 /* check the reason of requeuing without tx lock first */
> -               txq = netdev_get_tx_queue(txq->dev, skb_get_queue_mapping(skb));
> +               txq = skb_get_tx_queue(txq->dev, skb);
>                 if (!netif_xmit_frozen_or_stopped(txq)) {
>                         q->gso_skb = NULL;
>                         q->q.qlen--;
> @@ -183,10 +183,12 @@ static inline int qdisc_restart(struct Qdisc *q)
>         skb = dequeue_skb(q);
>         if (unlikely(!skb))
>                 return 0;
> +
>         WARN_ON_ONCE(skb_dst_is_noref(skb));
> +
>         root_lock = qdisc_lock(q);
>         dev = qdisc_dev(q);
> -       txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
> +       txq = skb_get_tx_queue(dev, skb);
>
>         return sch_direct_xmit(skb, q, dev, txq, root_lock);
>  }
> --
> 1.7.11.7
>
> --
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