Patrick McHardy
9b22ea5609
The changes to deliver hardware accelerated VLAN packets to packet
sockets (commit bc1d0411) caused a warning for non-NAPI drivers.
The __vlan_hwaccel_rx() function is called directly from the drivers
RX function, for non-NAPI drivers that means its still in RX IRQ
context:
[ 27.779463] ------------[ cut here ]------------
[ 27.779509] WARNING: at kernel/softirq.c:136 local_bh_enable+0x37/0x81()
...
[ 27.782520] [<c0264755>] netif_nit_deliver+0x5b/0x75
[ 27.782590] [<c02bba83>] __vlan_hwaccel_rx+0x79/0x162
[ 27.782664] [<f8851c1d>] atl1_intr+0x9a9/0xa7c [atl1]
[ 27.782738] [<c0155b17>] handle_IRQ_event+0x23/0x51
[ 27.782808] [<c015692e>] handle_edge_irq+0xc2/0x102
[ 27.782878] [<c0105fd5>] do_IRQ+0x4d/0x64
Split hardware accelerated VLAN reception into two parts to fix this:
- __vlan_hwaccel_rx just stores the VLAN TCI and performs the VLAN
device lookup, then calls netif_receive_skb()/netif_rx()
- vlan_hwaccel_do_receive(), which is invoked by netif_receive_skb()
in softirq context, performs the real reception and delivery to
packet sockets.
Reported-and-tested-by: Ramon Casellas <ramon.casellas@cttc.es>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/if_vlan.h>
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#include "vlan.h"
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struct vlan_hwaccel_cb {
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struct net_device *dev;
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};
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static inline struct vlan_hwaccel_cb *vlan_hwaccel_cb(struct sk_buff *skb)
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{
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return (struct vlan_hwaccel_cb *)skb->cb;
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}
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/* VLAN rx hw acceleration helper. This acts like netif_{rx,receive_skb}(). */
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int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
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u16 vlan_tci, int polling)
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{
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struct vlan_hwaccel_cb *cb = vlan_hwaccel_cb(skb);
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if (skb_bond_should_drop(skb)) {
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dev_kfree_skb_any(skb);
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return NET_RX_DROP;
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}
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skb->vlan_tci = vlan_tci;
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cb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
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return (polling ? netif_receive_skb(skb) : netif_rx(skb));
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}
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EXPORT_SYMBOL(__vlan_hwaccel_rx);
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int vlan_hwaccel_do_receive(struct sk_buff *skb)
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{
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struct vlan_hwaccel_cb *cb = vlan_hwaccel_cb(skb);
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struct net_device *dev = cb->dev;
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struct net_device_stats *stats;
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netif_nit_deliver(skb);
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if (dev == NULL) {
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kfree_skb(skb);
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return -1;
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}
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skb->dev = dev;
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skb->priority = vlan_get_ingress_priority(dev, skb->vlan_tci);
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skb->vlan_tci = 0;
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dev->last_rx = jiffies;
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stats = &dev->stats;
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stats->rx_packets++;
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stats->rx_bytes += skb->len;
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switch (skb->pkt_type) {
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case PACKET_BROADCAST:
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break;
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case PACKET_MULTICAST:
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stats->multicast++;
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break;
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case PACKET_OTHERHOST:
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/* Our lower layer thinks this is not local, let's make sure.
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* This allows the VLAN to have a different MAC than the
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* underlying device, and still route correctly. */
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if (!compare_ether_addr(eth_hdr(skb)->h_dest,
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dev->dev_addr))
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skb->pkt_type = PACKET_HOST;
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break;
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};
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return 0;
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}
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struct net_device *vlan_dev_real_dev(const struct net_device *dev)
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{
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return vlan_dev_info(dev)->real_dev;
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}
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EXPORT_SYMBOL_GPL(vlan_dev_real_dev);
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u16 vlan_dev_vlan_id(const struct net_device *dev)
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{
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return vlan_dev_info(dev)->vlan_id;
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}
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EXPORT_SYMBOL_GPL(vlan_dev_vlan_id);
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