Move pause frame counter out of struct if_ctx and into struct if_softc_ctx_t
so that we can use it in iflib to detect pause frames.

The igb(4) driver definitely used to use this in its old timer fun

Move pause frame counter out of struct if_ctx and into struct if_softc_ctx_t
so that we can use it in iflib to detect pause frames.

The igb(4) driver definitely used to use this in its old timer function and
I see no reason to restrict it to that driver only.

Sponsored by: Limelight Networks

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Allow MSIX to be turned off by tuneable per interface, per driver.

Sponsored by: Limelight Networks

IFLIB updates
- unconditionally enable BUS_DMA on non-x86 architectures
- speed up rxd zeroing via customized function
- support out of order updates to rxd's
- add prefetching to hardware descriptor

IFLIB updates
- unconditionally enable BUS_DMA on non-x86 architectures
- speed up rxd zeroing via customized function
- support out of order updates to rxd's
- add prefetching to hardware descriptor rings
- only prefetch on 10G or faster hardware
- add seperate tx queue intr function
- preliminary rework of NETMAP interfaces, WIP

Submitted by: Matt Macy <mmacy@nextbsd.org>
Sponsored by: Limelight Networks

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MFhead@r313243

Merge ^/head r312894 through r312967.

IFLIB updates:
We found routing performance dropped significantly when configuring
FreeBSD as a router, we are applying the following changes in order to
resolve those issues and hopefully perform be

IFLIB updates:
We found routing performance dropped significantly when configuring
FreeBSD as a router, we are applying the following changes in order to
resolve those issues and hopefully perform better.
- don't prefetch the flags array, we usually don't need it
- prefetch the next cache line of each of the software descriptor arrays as
well as the first cache line of each of the next four packets' mbufs and
clusters
- reduce max copy size to 63 bytes
- convert rx soft descriptors from array of structures to a structure of arrays
- update copyrights

Submitted by: Matt Macy <mmacy@nextbsd.org>

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2017 IFLIB updates in preparation for commits to e1000 and ixgbe.
- iflib - add checksum in place support (mmacy)
- iflib - initialize IP for TSO (going to be needed for e1000) (mmacy)
- iflib - move

2017 IFLIB updates in preparation for commits to e1000 and ixgbe.
- iflib - add checksum in place support (mmacy)
- iflib - initialize IP for TSO (going to be needed for e1000) (mmacy)
- iflib - move isc_txrx from shared context to softc context (mmacy)
- iflib - Normalize checks in TXQ drainage. (shurd)
- iflib - Fix queue capping checks (mmacy)
- iflib - Fix invalid assert, em can need 2 sentinels (mmacy)
- iflib - let the driver determine what capabilities are set and what
tx csum flags are used (mmacy)
- add INVARIANTS debugging hooks to gtaskqueue enqueue (mmacy)
- update bnxt(4) to support the changes to iflib (shurd)

Some other various, sundry updates. Slightly more verbose changelog:

Submitted by: mmacy@nextbsd.org
Reviewed by: shurd
mFC after:
Sponsored by: LimeLight Networks and Dell EMC Isilon

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Merge ^/head r303250 through r304235.

MFhead @ r304038

Update iflib to support more NIC designs

- Move group task queue into kern/subr_gtaskqueue.c
- Change intr_enable to return an int so it can be detected if it's not
implemented
- Allow different T

Update iflib to support more NIC designs

- Move group task queue into kern/subr_gtaskqueue.c
- Change intr_enable to return an int so it can be detected if it's not
implemented
- Allow different TX/RX queues per set to be different sizes
- Don't split up TX mbufs before transmit
- Allow a completion queue for TX as well as RX
- Pass the RX budget to isc_rxd_available() to allow an earlier return
and avoid multiple calls

Submitted by: shurd
Reviewed by: gallatin
Approved by: scottl
Differential Revision: https://reviews.freebsd.org/D7393

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Import the 'iflib' API library for network drivers. From the author:

"iflib is a library to eliminate the need for frequently duplicated device
independent logic propagated (poorly) across many net

Import the 'iflib' API library for network drivers. From the author:

"iflib is a library to eliminate the need for frequently duplicated device
independent logic propagated (poorly) across many network drivers."

Participation is purely optional. The IFLIB kernel config option is
provided for drivers that want to transition between legacy and iflib
modes of operation. ixl and ixgbe driver conversions will be committed
shortly. We hope to see participation from the Broadcom and maybe
Chelsio drivers in the near future.

Submitted by: mmacy@nextbsd.org
Reviewed by: gallatin
Differential Revision: D5211

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