Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r260056:

In sys/dev/vxge/vxgehal/vxgehal-ring.c, #if 0 an unused static function.

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Clean up -Wheader-guard warnings.

Submitted by: <dt71@gmx.com>
MFC after: 3 days
X-MFC with: r251848

Use DEVMETHOD_END macro defined in sys/bus.h instead of {0, 0} sentinel on device_method_t arrays

Reviewed by: cognet
Approved by: cognet

Mechanically substitute flags from historic mbuf allocator with
malloc(9) flags in sys/dev.

The drbr(9) API appeared to be so unclear, that most drivers in
tree used it incorrectly, which lead to inaccurate overrated
if_obytes accounting. The drbr(9) used to update ifnet stats on
drbr_enqueue(), which is not accurate since enqueuing doesn't
imply successful processing by driver. Dequeuing neither mean
that. Most drivers also called drbr_stats_update() which did
accounting again, leading to doubled if_obytes statistics. And
in case of severe transmitting, when a packet could be several
times enqueued and dequeued it could have been accounted several
times.

o Thus, make drbr(9) API thinner. Now drbr(9) merely chooses between
ALTQ queueing or buf_ring(9) queueing.
- It doesn't touch the buf_ring stats any more.
- It doesn't touch ifnet stats anymore.
- drbr_stats_update() no longer exists.

o buf_ring(9) handles its stats itself:
- It handles br_drops itself.
- br_prod_bytes stats are dropped. Rationale: no one ever
reads them but update of a common counter on every packet
negatively affects performance due to excessive cache
invalidation.
- buf_ring_enqueue_bytes() reduced to buf_ring_enqueue(), since
we no longer account bytes.

o Drivers handle their stats theirselves: if_obytes, if_omcasts.

o mlx4(4), igb(4), em(4), vxge(4), oce(4) and ixv(4) no longer
use drbr_stats_update(), and update ifnet stats theirselves.

o bxe(4) was the most correct driver, it didn't call
drbr_stats_update(), thus it was the only driver accurate under
moderate load. Now it also maintains stats itself.

o ixgbe(4) had already taken stats from hardware, so just
- drop software stats updating.
- take multicast packet count from hardware as well.

o mxge(4) just no longer needs NO_SLOW_STATS define.

o cxgb(4), cxgbe(4) need no change, since they obtain stats
from hardware.

Reviewed by: jfv, gnn

s/teh/the/g

Approved by: cperciva
MFC after: 3 days

Fix warning generated by clang;
warning: equality comparison with extraneous parentheses
[-Wparentheses-equality]

Reported by: arundel
Reviewed by: gnn
Approved by: cperciva
MFC after: 3 days

Remove spurious 8bit chars, turning files into plain ASCII.

ether_ifattach() sets if_mtu to ETHERMTU, don't bother set it again

Reviewed by: yongari

Do not define bool/true/false if the symbols already exist.

MFC after: 2 weeks
Sponsored by: Isilon Systems, LLC

- change "is is" to "is" or "it is"
- change "the the" to "the"

Approved by: lstewart
Approved by: sahil (mentor)
MFC after: 3 days

Add in support for multicast.

Submitted by: Sriram Rapuru at @ Wipro for Exar Inc.
MFC after: 2 weeks

Exar driver for X3100 10GbE Server/Storage adapters

Features: Jumbo frames (up to 9600), LRO (Large Receive Offload),
TSO (TCP segmentation offload), RTH (Receive Traffic Hash).

Submitted by: Sriram Rapuru at Exar
MFC after: 2 weeks