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>		2014-10-07 13:22:11 -04:00
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bsd_comp.c
Kconfig
Makefile
ppp_async.c
ppp_deflate.c
ppp_generic.c	net: better IFF_XMIT_DST_RELEASE support	2014-10-07 13:22:11 -04:00
ppp_mppe.c
ppp_mppe.h
ppp_synctty.c
pppoe.c	net: pppoe: use correct channel MTU when using Multilink PPP	2014-07-14 14:35:46 -07:00
pppox.c
pptp.c	inetpeer: get rid of ip_id_count	2014-06-02 11:00:41 -07:00