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| author |   Magnus Karlsson <magnus.karlsson@intel.com> | 2018-05-02 13:01:33 +0200 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2018-05-03 15:55:24 -0700 |
| commit | 865b03f21162e4edfda51fc08693c864b1d4fdaf (patch) | |
| tree | a1ddbccb1429b3d756717a1487b636f253d476d9 /net/core/dev.c | |
| parent | xsk: add Tx queue setup and mmap support (diff) | |
| download | linux-dev-865b03f21162e4edfda51fc08693c864b1d4fdaf.tar.xz linux-dev-865b03f21162e4edfda51fc08693c864b1d4fdaf.zip | |
dev: packet: make packet_direct_xmit a common function
The new dev_direct_xmit will be used by AF_XDP in later commits.
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net/core/dev.c')
| -rw-r--r-- | net/core/dev.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index aea36b5a2fed..d3fdc86516e8 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -3625,6 +3625,44 @@ int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv) } EXPORT_SYMBOL(dev_queue_xmit_accel); +int dev_direct_xmit(struct sk_buff *skb, u16 queue_id) +{ + struct net_device *dev = skb->dev; + struct sk_buff *orig_skb = skb; + struct netdev_queue *txq; + int ret = NETDEV_TX_BUSY; + bool again = false; + + if (unlikely(!netif_running(dev) || + !netif_carrier_ok(dev))) + goto drop; + + skb = validate_xmit_skb_list(skb, dev, &again); + if (skb != orig_skb) + goto drop; + + skb_set_queue_mapping(skb, queue_id); + txq = skb_get_tx_queue(dev, skb); + + local_bh_disable(); + + HARD_TX_LOCK(dev, txq, smp_processor_id()); + if (!netif_xmit_frozen_or_drv_stopped(txq)) + ret = netdev_start_xmit(skb, dev, txq, false); + HARD_TX_UNLOCK(dev, txq); + + local_bh_enable(); + + if (!dev_xmit_complete(ret)) + kfree_skb(skb); + + return ret; +drop: + atomic_long_inc(&dev->tx_dropped); + kfree_skb_list(skb); + return NET_XMIT_DROP; +} +EXPORT_SYMBOL(dev_direct_xmit); /************************************************************************* * Receiver routines |