Paolo Abeni 63d75463c9 net: pktgen: fix pkt_size
The commit 879c7220e828 ("net: pktgen: Observe needed_headroom
of the device") increased the 'pkt_overhead' field value by
LL_RESERVED_SPACE.
As a side effect the generated packet size, computed as:

	/* Eth + IPh + UDPh + mpls */
	datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 -
		  pkt_dev->pkt_overhead;

is decreased by the same value.
The above changed slightly the behavior of existing pktgen users,
and made the procfs interface somewhat inconsistent.
Fix it by restoring the previous pkt_overhead value and using
LL_RESERVED_SPACE as extralen in skb allocation.
Also, change pktgen_alloc_skb() to only partially reserve
the headroom to allow the caller to prefetch from ll header
start.

v1 -> v2:
 - fixed some typos in the comments

Fixes: 879c7220e828 ("net: pktgen: Observe needed_headroom of the device")
Suggested-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-10-03 01:29:57 -04:00
..
2016-06-28 05:26:14 -04:00
2016-10-03 01:29:57 -04:00
2016-07-05 14:08:47 -07:00
2016-09-23 08:38:50 -04:00
2015-10-23 03:05:19 -07:00
2016-05-29 22:33:25 -07:00
2016-09-01 10:13:15 -07:00
2016-06-09 23:41:03 -07:00
2016-08-17 19:36:23 -04:00
2016-08-17 19:36:23 -04:00