Alexander Duyck 847a1d6796 e1000: Do not overestimate descriptor counts in Tx pre-check ... The current code path is capable of grossly overestimating the number of descriptors needed to transmit a new frame. This specifically occurs if the skb contains a number of 4K pages. The issue is that the logic for determining the descriptors needed is ((S) >> (X)) + 1. When X is 12 it means that we were indicating that we required 2 descriptors for each 4K page when we only needed one. This change corrects this by instead adding (1 << (X)) - 1 to the S value instead of adding 1 after the fact. This way we get an accurate descriptor needed count as we are essentially doing a DIV_ROUNDUP(). Reported-by: Ivan Suzdal <isuzdal@mirantis.com> Signed-off-by: Alexander Duyck <aduyck@mirantis.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>		2016-04-05 14:59:05 -07:00
..
e1000_ethtool.c	drivers/net: get rid of unnecessary initializations in .get_drvinfo()	2015-10-16 00:24:10 -07:00
e1000_hw.c	e1000: Elementary checkpatch warnings and checks removed	2015-12-12 23:13:52 -08:00
e1000_hw.h	e1000: move e1000_tbi_adjust_stats to where its used	2014-09-12 00:51:10 -07:00
e1000_main.c	e1000: Do not overestimate descriptor counts in Tx pre-check	2016-04-05 14:59:05 -07:00
e1000_osdep.h
e1000_param.c	e1000: fix whitespace issues and multi-line comments	2013-02-15 21:46:37 -08:00
e1000.h	e1000: fix data race between tx_ring->next_to_clean	2015-12-12 23:09:48 -08:00
Makefile