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Eric Dumazet 0287587884 net: better IFF_XMIT_DST_RELEASE support ... Testing xmit_more support with netperf and connected UDP sockets, I found strange dst refcount false sharing. Current handling of IFF_XMIT_DST_RELEASE is not optimal. Dropping dst in validate_xmit_skb() is certainly too late in case packet was queued by cpu X but dequeued by cpu Y The logical point to take care of drop/force is in __dev_queue_xmit() before even taking qdisc lock. As Julian Anastasov pointed out, need for skb_dst() might come from some packet schedulers or classifiers. This patch adds new helper to cleanly express needs of various drivers or qdiscs/classifiers. Drivers that need skb_dst() in their ndo_start_xmit() should call following helper in their setup instead of the prior : dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; -> netif_keep_dst(dev); Instead of using a single bit, we use two bits, one being eventually rebuilt in bonding/team drivers. The other one, is permanent and blocks IFF_XMIT_DST_RELEASE being rebuilt in bonding/team. Eventually, we could add something smarter later. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Julian Anastasov <ja@ssi.bg> Signed-off-by: David S. Miller <davem@davemloft.net>		10 years ago
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Kconfig	…
Makefile	…
vlan.c	vlan: fail early when creating netdev named config	11 years ago
vlan.h	8021q: Convert uses of __constant_<foo> to <foo>	11 years ago
vlan_core.c	net: Always untag vlan-tagged traffic on input.	11 years ago
vlan_dev.c	net: better IFF_XMIT_DST_RELEASE support	10 years ago
vlan_gvrp.c	…
vlan_mvrp.c	…
vlan_netlink.c	8021q: Convert uses of __constant_<foo> to <foo>	11 years ago
vlanproc.c	vlan: fail early when creating netdev named config	11 years ago
vlanproc.h	…