MFC r331654, r331869

r331654:
Don't access userspace directly from the kernel in nxge(4).

Update to what the previous code seemed to be doing via the correct
interfaces. Further issues exist in xge_ioctl_registers(), but this is
debugging code in a driver that has few users and they don't appear to
be crashes or leaks.

Reviewed by: jhb (prior version)
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D14848

r331869:
Fix the build on arches with default unsigned char. Capture the fubyte()
return value in an int as well as the char, and test the full int value
for fubyte() failure.

MFC r283291: don't use CALLOUT_MPSAFE with callout_init()

The main purpose of this MFC is to reduce conflicts for other merges.
Parts of the original change have already "trickled down" via individual MFCs.

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

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

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.

Fix typo; s/ouput/output

Fix the following compilation warnings in nxge(4):

sys/dev/nxge/if_nxge.c:1276:11: error: case value not in enumerated type 'xge_hal_event_e' (aka 'enum xge_hal_event_e') [-Werror,-Wswitch]
case XGE_LL_EVENT_TRY_XMIT_AGAIN:
^
sys/dev/nxge/if_nxge.c:1289:11: error: case value not in enumerated type 'xge_hal_event_e' (aka 'enum xge_hal_event_e') [-Werror,-Wswitch]
case XGE_LL_EVENT_DEVICE_RESETTING:
^

This is because the switch uses xge_queue_item_t::event_type, which is
an enum xge_hal_event_e, while the XGE_LL_EVENT_xx values are of the
enum xge_event_e.

Since messing around with the enum definitions is too disruptive, the
simplest fix is to cast the argument of the switch to int.

Reviewed by: gnn
MFC after: 1 week

Convert files to UTF-8

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

Fix typos - remove duplicate "the".

PR: bin/154928
Submitted by: Eitan Adler <lists at eitanadler.com>
MFC after: 3 days

Add new tunable 'net.link.ifqmaxlen' to set default send interface
queue length. The default value for this parameter is 50, which is
quite low for many of today's uses and the only way to modify this
parameter right now is to edit if_var.h file. Also add read-only
sysctl with the same name, so that it's possible to retrieve the
current value.

MFC after: 1 month

Fix compile after previous "harmless" commit.

Pointy hat to: jhb

These drivers only set if_timer but never set if_watchdog. Just remove
the assignments to if_timer.

Use if_maddr_rlock()/if_maddr_runlock() rather than IF_ADDR_LOCK()/
IF_ADDR_UNLOCK() across network device drivers when accessing the
per-interface multicast address list, if_multiaddrs. This will
allow us to change the locking strategy without affecting our driver
programming interface or binary interface.

For two wireless drivers, remove unnecessary locking, since they
don't actually access the multicast address list.

Approved by: re (kib)
MFC after: 6 weeks

- bump __FreeBSD version to reflect added buf_ring, memory barriers,
and ifnet functions

- add memory barriers to <machine/atomic.h>
- update drivers to only conditionally define their own

- add lockless producer / consumer ring buffer
- remove ring buffer implementation from cxgb and update its callers

- add if_transmit(struct ifnet *ifp, struct mbuf *m) to ifnet to
allow drivers to efficiently manage multiple hardware queues
(i.e. not serialize all packets through one ifq)
- expose if_qflush to allow drivers to flush any driver managed queues

This work was supported by Bitgravity Inc. and Chelsio Inc.

Merge Neterion if_nxge driver version 2.0.9.11230 with the following
changes:

01 - Enhanced LRO:
LRO feature is extended to support multi-buffer mode. Previously,
Ethernet frames received in contiguous buffers were offloaded.
Now, frames received in multiple non-contiguous buffers can be
offloaded, as well. The driver now supports LRO for jumbo frames.

02 - Locks Optimization:
The driver code was re-organized to limit the use of locks.
Moreover, lock contention was reduced by replacing wait locks
with try locks.

03 - Code Optimization:
The driver code was re-factored to eliminate some memcpy
operations. Fast path loops were optimized.

04 - Tag Creations:
Physical Buffer Tags are now optimized based upon frame size.
For better performance, Physical Memory Maps are now re-used.

05 - Configuration:
Features such as TSO, LRO, and Interrupt Mode can be configured
either at load or at run time. Rx buffer mode (mode 1 or mode 2)
can be configured at load time through kenv.

06 - Driver Statistics:
Run time statistics are enhanced to provide better visibility
into the driver performance.

07 - Bug Fixes:
The driver contains fixes for the problems discovered and
reported since last submission.

08 - MSI support:
Added Message Signaled Interrupt feature which currently uses 1
message.

09 Removed feature:
Rx 3 buffer mode feature has been removed. Driver now supports 1,
2 and 5 buffer modes of which 2 and 5 buffer modes can be used
for header separation.

10 Compiler warning:
Fixed compiler warning when compiled for 32 bit system.

11 Copyright notice:
Source files are updated with the proper copyright notice.

MFC after: 3 days
Submitted by: Alicia Pena <Alicia dot Pena at neterion dot com>,
Muhammad Shafiq <Muhammad dot Shafiq at neterion dot com>

Directly initialize nxge's ifaddrp pointer to ifnetp->if_addr rather
than indirecting through ifaddr_byindex, which makes things easier with
respect to virtualized network stacks.

Submitted by: Marko Zec <zec at icir dot org>
Reviewed by: Leonid Grossman <Leonid dot Grossman at neterion dot com>
Approved by: re (kensmith)

Fix warnings.
nxge: cast page size fragments down to (int). If the vm's demand paging
PAGE_SIZE is ever too big for that, we've got far bigger problems.
ofw: move va_start() a little earlier. gcc-4.2 doesn't like us modifying
the last arg before the va_start().

Approved by: re (rwatson)

Neterion Xframe 10GbE Server/Storage adapter driver.

The nxge driver provides support for Neterion Xframe-I and Xframe-II
adapters. The driver supports TCP Segmentation Offload (TSO/LSO),
Jumbo frames (5 buffer mode), Header separation (2 and 3 Receive
buffer modes), VLAN, and Promiscuous mode.

Submitted by: Neterion
Reviewed by: rwatson
Approved by: re (kensmith)