MFC r319872, r321063, r321582, r322034, r322425, r322962, r322985,
r325596, r326026, r328420, r331472, r333276, r333650, r333652, r334406,
r334409-r334410, r334489, r336042, r340651, r342603, and r345083.

This updates the cxgbe firmwares in stable/10 and also pulls in support
for some newer boards and flash parts.

r319872:
cxgbe(4): Do not request an FEC setting that the port does not support.

r321063:
cxgbe(4): Various link/media related improvements.

r321582:
cxgbe(4): Some updates to the common code.

r322034:
cxgbe(4): Always use the first and not the last virtual interface
associated with a port in begin_synchronized_op.

r322425:
cxgbe(4): Save the last reported link parameters and compare them with
the current state to determine whether to generate a link-state change
notification. This fixes a bug introduced in r321063 that caused the
driver to sometimes skip these notifications.

r322962:
cxgbe(4): Remove write only variable from t4_port_init.

r322985:
cxgbe(4): Maintain one ifmedia per physical port instead of one per
Virtual Interface (VI). All autonomous VIs that share a port share the
same media.

r325596:
cxgbe(4): Do not request settings not supported by the port.

r326026:
cxgbe(4): Add a custom board to the device id list.

r328420:
cxgbe(4): Do not display harmless warning in non-debug builds.

r331472:
cxgbe(4): Always initialize requested_speed to a valid value.

This fixes an avoidable EINVAL when the user tries to disable AN after
the port is initialized but l1cfg doesn't have a valid speed to use.

r333276:
cxgbe(4): Update all firmwares to 1.19.1.0.

r333650:
cxgbe(4): Claim some more T5 and T6 boards.

r333652:
cxgbe(4): Add support for two more flash parts.

r334406:
cxgbe(4): Consider all supported speeds when building the ifmedia list
for a port. Fix other related issues while here:
- Require port lock for access to link_config.
- Allow 100Mbps operation by tracking the speed in Mbps. Yes, really.
- New port flag to indicate that the media list is immutable. It will
be used in future refinements.

This also fixes a bug where the driver reports incorrect media with
recent firmwares.

r334409:
cxgbe(4): Implement ifm_change callback.

r334410:
cxgbe(4): Use ifm for ifmedia just like the rest of the kernel.

No functional change.

r334489:
cxgbe(4): Include full duplex mediaopt in media that can be reported as
active. Always report full duplex in active media.

r336042:
cxgbe(4): Assume that any unknown flash on the card is 4MB and has 64KB
sectors, instead of refusing to attach to the card.

r340651:
cxgbe(4): Update T4/5/6 firmwares to 1.22.0.3.

r342603:
cxgbe(4): Attach to two T540 variants.

r345083:
cxgbe(4): Update T4/5/6 firmwares to 1.23.0.0.

MFC 318387: Add support for child devices that aren't ports.

Invoke any identify routines of child drivers during attach before attaching
children, and delete any remaining devices after deleting ports.

Sponsored by: Chelsio Communications

MFC r318014, r318091, r318125, and r318263.

r318014:
cxgbe(4): Fixes related to the knob that controls link autonegotiation.

- Do not leak the adapter lock in sysctl_autoneg.
- Accept only 0 or 1 as valid settings for autonegotiation.
- A fixed speed must be requested by the driver when autonegotiation is
disabled otherwise the firmware will reject the l1cfg command. Use
the top speed supported by the port for now.

r318091:
cxgbe(4): Do not assume that if_qflush is always followed by inteface-down.

r318125:
Adjust whitespace and fix a comment. No functional change.

r318263:
cxgbe(4): netmap-only interrupts for a VI do not have an associated rxq
or ofld_rxq and should be ignored by vi_intr_iq.

Sponsored by: Chelsio Communications

MFC r317702, r317847, r318307

r317702:
cxgbe(4): Support routines for Tx traffic scheduling.

- Create a new file, t4_sched.c, and move all of the code related to
traffic management from t4_main.c and t4_sge.c to this file.
- Track both Channel Rate Limiter (ch_rl) and Class Rate Limiter (cl_rl)
parameters in the PF driver.
- Initialize all the cl_rl limiters with somewhat arbitrary default
rates and provide routines to update them on the fly.
- Provide routines to reserve and release traffic classes.

r317847:
cxgbe(4): The Tx scheduler initialization either works or doesn't. It
doesn't need a refresh in either case.

r318307:
cxgbe(4): Avoid an out of bounds access when an attempt to unbind a tx
queue from a traffic class fails.

Sponsored by: Chelsio Communications

MFC r317820 and r317837.

r317820:
cxgbe(4): Update the list of PCIe devices claimed by the driver. At
this point any board with a T6 should just work.

r317837:
cxgbe(4): Update the VF device ids too. This should have been part
of r317820.

Sponsored by: Chelsio Communications

MFC r316506:

cxgbe(4): Program the global RSS key once instead of once per ifnet.

Sponsored by: Chelsio Communications

MFC r309725:

cxgbe(4): netmap does not set IFCAP_NETMAP in an ifnet's if_capabilities
any more (since r307394). Do it in the driver instead.

MFC r313318:

cxgbe(4): Allow tunables that control the number of queues to be set to
'-n' to tell the driver to create _up to_ 'n' queues if enough cores are
available. For example, setting hw.cxgbe.nrxq10g="-32" will result in
16 queues if the system has 16 cores, 32 if it has 32.

There is no change in the default number of queues of any type.

Sponsored by: Chelsio Communications

MFC r316774:

cxgbe: Query some more RDMA related parameters from the firmware.

Sponsored by: Chelsio Communications

MFC r315201, r315920, r315921, r315922, r316008, and r316062.

r315201:
cxgbe(4): Fix an always-true assertion (reported by PVS-Studio).

sys/dev/cxgbe/t4_main.c: PVS-Studio: Expression is Always True (CWE-571) (3)

r315920:
cxgbe/iw_cxgbe: c4iw_connect should always returns a -ve errno on failure.

r315921:

cxgbe/iw_cxgbe: alloc_ep expects a gfp_t, and it's always ok to sleep during
alloc_ep.

r315922:
cxgbe/iw_cxgbe: allocations that use GFP_KERNEL (which is M_WAITOK on
FreeBSD) cannot fail.

r316008:
cxgbe/iw_cxgbe: Remove unused code.

r316062:
cxgbe/iw_cxgbe: Defer the handling of error CQEs and RDMA_TERMINATE to
the thread that deals with socket state changes. This eliminates
various bad races with the ithread.

MFC r311848:
cxgbe(4): Attach to the 2x25 debug card. This is for internal use only.

MFC r309666, r310033, r310049, r310100, r310152, and r310807.

r309666:
cxgbe(4): unsigned short isn't large enough to store link speed (which
is in Mbps) for 100Gbps links.

r310033:
cxgbe(4): Retire t4_bus_space_read_8 and t4_bus_space_write_8.

r310049:
cxgbe(4): Fix the tid range shown for T6 cards in misc.tids.

r310100:
cxgbe(4): Deal with compressed error vectors.

r310152:
cxgbe(4): Fix typo in an unused macro.

r310807:
cxgbe(4): Updates to link configuration.

- Update struct link_settings and associated shared code.

- Add tunables to control FEC and autonegotiation. All ports inherit
these values as their initial settings.
hw.cxgbe.fec
hw.cxgbe.autoneg

- Add per-port sysctls to control FEC and autonegotiation. These can be
modified at any time.
dev.<port>.<n>.fec
dev.<port>.<n>.autoneg

MFC 309613: cxgbe(4): Update firmwares from version 1.16.12.0 to 1.16.22.0.

Sponsored by: Chelsio Communications

MFC 307233:
cxgbe(4): Allow the interface MTU to be set as high as the actual
hardware limit.

MFC 306821,306823: Permit updating firmware config file in flash.

306821:
cxgbe(4): Add an ioctl to copy a firmware config file to the card's flash.

306823:
cxgbetool: Add a loadcfg subcommand to allow a user to upload a firmware
configuration file to the card.

MFC 305695,305696,305699,305702,305703,305713,305715,305827,305852,305906,
305908,306062,306063,306137,306138,306206,306216,306273,306295,306301,
306465,309302:
Add support for adapters using the Terminator T6 ASIC.

305695:
cxgbe(4): Set up fl_starve_threshold2 accurately for T6.

305696:
cxgbe(4): Use correct macro for header length with T6 ASICs. This
affects the transmit of the VF driver only.

305699:
cxgbe(4): Update the pad_boundary calculation for T6, which has a
different range of boundaries.

305702:
cxgbe(4): Use smaller min/max bursts for fl descriptors with a T6.

305703:
cxgbe(4): Deal with the slightly different SGE_STAT_CFG in T6.

305713:
cxgbe(4): Add support for additional port types and link speeds.

305715:
cxgbe(4): Catch up with the rename of tlscaps -> cryptocaps. TLS is one
of the capabilities of the crypto engine in T6.

305827:
cxgbe(4): Use the interface's viid to calculate the PF/VF/VFValid fields
to use in tx work requests.

305852:
cxgbe(4): Attach to cards with the Terminator 6 ASIC. T6 cards will
come up as 't6nex' nexus devices with 'cc' ports hanging off them.

The T6 firmware and configuration files will be added as soon as they
are released. For now the driver will try to work with whatever
firmware and configuration is on the card's flash.

305906:
cxgbe/t4_tom: The SMAC entry for a VI is at a different location in the T6.

305908:
cxgbe/t4_tom: Update the active/passive open code to support T6. Data
path works as-is.

306062:
cxgbe(4): Show wcwr_stats for T6 cards.

306063:
cxgbe(4): Setup congestion response for T6 rx queues.

306137:
cxgbetool: Add T6 support to the SGE context decoder.

306138:
Fix typo.

306206:
cxgbe(4): Catch up with the different layout of WHOAMI in T6.

Note that the code moved below t4_prep_adapter() as part of this change
because now it needs a working chip_id().

306216:
cxgbe(4): Fix the output of the "tids" sysctl on T6.

306273:
cxgbe(4): Fix netmap with T6, which doesn't encapsulate SGE_EGR_UPDATE
message inside a FW_MSG. The base NIC already deals with updates in
either form.

306295:
cxgbe(4): Support SIOGIFXMEDIA so that ifconfig displays correct media
for 25Gbps and 100Gbps ports. This should have been part of r305713,
which is when the driver first started reporting extended media types.

306301:
cxgbe(4): Use the port's top speed to figure out whether it is "high
speed" or not (for the purpose of calculating the number of queues etc.)
This does the right thing for 25Gbps and 100Gbps ports.

306465:
cxgbe(4): Claim the T6 -DBG card.

309302:
cxgbe(4): Include firmware for T6 cards in the driver. Update all
firmwares to 1.16.12.0.

Sponsored by: Chelsio Communications

MFC 305667:
cxgbe(4): Avoid a NULL dereference in the clearstats ioctl handler.
Port softc's are not initialized when the adapter is in recovery mode.

MFC 303348:
cxgbe(4): Initialize the adapter queues (fwq and mgmtq) instead of
returning EAGAIN if they aren't available when the user tries to program
a filter. Do this after validating the filter so that the driver
doesn't bring up the queues if it doesn't have to.

MFC 302440,304873,305704,305985,306787,307531: Fixes for sysctls.

302440:
cxgbe(4): Add sysctl to display the RSS indirection table size for an
interface.

dev.cxl.<n>.rss_size
dev.vcxl.<n>.rss_size

304873:
cxgbe(4): Provide more details about the card in the sysctl MIB.

dev.t5nex.0.%desc: Chelsio T580-CR
dev.t5nex.0.hw_revision: 1
dev.t5nex.0.sn: PT13140042
dev.t5nex.0.pn: 110117150A0
dev.t5nex.0.ec: 0000000000000000
dev.t5nex.0.na: 0007432AF490
dev.t5nex.0.vpd_version: 3
dev.t5nex.0.scfg_version: 53255
dev.t5nex.0.bs_version: 1.1.0.0
dev.t5nex.0.er_version: 1.0.0.68
dev.t5nex.0.tp_version: 0.1.4.9
dev.t5nex.0.firmware_version: 1.16.2.0

305704:
cxgbe(4): Rename the debug_flags driver tunable/sysctl to dflags.
Tunables that end with _flags are special.

305985:
cxgbe(4): Fixes to wrq stats.

- Increment tx_wrs_copied in the correct place.
- Add tx_wrs_sspace to the sysctl MIB.

306787:
cxgbe(4): Fix whitespace in the pm_stats display.

307531:
cxgbe(4): Adjust whitespace to line up the column titles in cim_qcfg
with the values displayed.

Sponsored by: Chelsio Communications

MFC 303522,303647,303860,303880,304168-304170,304479,304482,304485,305548,
305549:
Chelsio T4/T5 VF driver.

303522:
Various fixes to the t4/5nex character device.

- Remove null open/close methods.
- Don't set d_flags to 0 explicitly.
- Remove t5_cdevsw as the .d_name member isn't really used and doesn't
warrant a separate cdevsw just for the name.
- Use ENOTTY as the error value for an unknown ioctl request.
- Use make_dev_s() to close race with setting si_drv1.

303647:
Store the offset of the KDOORBELL and GTS registers in the softc.

VF devices use a different register layout than PF devices. Storing
the offset in a value in the softc allows code to be shared between the
PF and VF drivers.

303860:
Reserve an adapter flag IS_VF to mark VF devices vs PF devices.

303880:
Track the base absolute ID of ingress and egress queues.

Use this to map an absolute queue ID to a logical queue ID in interrupt
handlers. For the regular cxgbe/cxl drivers this should be a no-op as
the base absolute ID should be zero. VF devices have a non-zero base
absolute ID and require this change. While here, export the absolute ID
of egress queues via a sysctl.

304168:
Make SGE parameter handling more VF-friendly.

Add fields to hold the SGE control register and free list buffer sizes to
the sge_params structure. Populate these new fields in
t4_init_sge_params() for PF devices and change t4_read_chip_settings() to
pull these values out of the params structure instead of reading
registers directly. This will permit t4_read_chip_settings() to be reused
for VF devices which cannot read SGE registers directly.

While here, move the call to t4_init_sge_params() to
get_params__post_init(). The VF driver will populate the SGE parameters
structure via a different method before calling t4_read_chip_settings().

304169:
Update mailbox writes to work with VF devices.

- Use alternate register locations for the data and control registers for
VFs.
- Do a dummy read to force the writes to the mailbox data registers to
post before the write to the control register on VFs.
- Do not check the PCI-e firmware register for errors on VFs.

304170:
Add support for register dumps on VF devices.

- Add handling of VF register sets to t4_get_regs_len() and t4_get_regs().
- While here, use t4_get_regs_len() in the ioctl handler for regdump
instead of inlining it.

304479:
Add structures for VF-specific adapter parameters.

While here, mark which parameters are PF-specific and which are
VF-specific.

304482:
Adjust t4_port_init() to work with VF devices.

Specifically, the FW_PORT_CMD may or may not work for a VF (the PF
driver can choose whether or not to permit access to this command),
so don't attempt to fetch port information on a VF if permission is
denied by the PF.

304485:
Reorder sysctls so that nodes shared with the VF driver are added first.

This permits a single early return for VF devices in the routines that
add sysctl nodes.

305548:
Don't break out of the m_advance() loop if len drops to zero.

If a packet contains the Ethernet header (14 bytes) in the first mbuf
and the payload (IP + UDP + data) in the second mbuf, then the attempt
to fetch the l3hdr will return a NULL pointer. The first loop iteration
will drop len to zero and exit the loop without setting 'p'. However,
the desired data is at the start of the second mbuf, so the correct
behavior is to loop around and let the conditional set 'p' to m_data of
the next mbuf (and leave offset as 0).

305549:
Chelsio T4/T5 VF driver.

The cxgbev/cxlv driver supports Virtual Function devices for Chelsio
T4 and T4 adapters. The VF devices share most of their code with the
existing PF4 driver (cxgbe/cxl) and as such the VF device driver
currently depends on the PF4 driver.

Similar to the cxgbe/cxl drivers, the VF driver includes a t4vf/t5vf
PCI device driver that attaches to the VF device. It then creates
child cxgbev/cxlv devices representing ports assigned to the VF.
By default, the PF driver assigns a single port to each VF.

t4vf_hw.c contains VF-specific routines from the shared code used to
fetch VF-specific parameters from the firmware.

t4_vf.c contains the VF-specific PCI device driver and includes its
own attach routine.

VF devices are required to use a different firmware request when
transmitting packets (which in turn requires a different CPL message
to encapsulate messages). This alternate firmware request does not
permit chaining multiple packets in a single message, so each packet
results in a firmware request. In addition, the different CPL message
requires more detailed information when enabling hardware checksums,
so parse_pkt() on VF devices must examine L2 and L3 headers for all
packets (not just TSO packets) for VF devices. Finally, L2 checksums
on non-UDP/non-TCP packets do not work reliably (the firmware trashes
the IPv4 fragment field), so IPv4 checksums for such packets are
calculated in software.

Most of the other changes in the non-VF-specific code are to expose
various variables and functions private to the PF driver so that they
can be used by the VF driver.

Note that a limited subset of cxgbetool functions are supported on VF
devices including register dumps, scheduler classes, and clearing of
statistics. In addition, TOE is not supported on VF devices, only for
the PF interfaces.

Sponsored by: Chelsio Communications

MFC 302339:
cxgbe(4): Changes to the CPL-handler registration mechanism and code
related to "shared" CPLs.

a) Combine t4_set_tcb_field and t4_set_tcb_field_rpl into a single
function. Allow callers to direct the response to any iq. Tidy up
set_ulp_mode_iscsi while there to use names from t4_tcb.h instead of
magic constants.

b) Remove all CPL handler tables from struct adapter. This reduces its
size by around 2KB. All handlers are now registered at MOD_LOAD instead
of attach or some kind of initialization/activation. The registration
functions do not need an adapter parameter any more.

c) Add per-iq handlers to deal with CPLs whose destination cannot be
determined solely from the opcode. There are 2 such CPLs in use right
now: SET_TCB_RPL and L2T_WRITE_RPL. The base driver continues to send
filter and L2T_WRITEs over the mgmtq and solicits the reply on fwq.
t4_tom (including the DDP code) now uses the port's ctrlq to send
L2T_WRITEs and SET_TCB_FIELDs and solicits the reply on an ofld_rxq.
fwq and ofld_rxq have different handlers that know what kind of tid to
expect in the reply. Update t4_write_l2e and callers to to support any
wrq/iq combination.

Sponsored by: Chelsio Communications

MFC 292736:
cxgbe(4): Updates to the base NIC driver and t4_tom to support the iSCSI
offload driver. These changes come from projects/cxl_iscsi.

Note that these changes make use of the mbufq API from 11.0, but that
API is not present in 10.x in the same form. Borrow an implementation
from the CAM CTL ha code that uses m_nextpkt to implement mbufq for use
in 10.

MFC 301516,301520,301531,301535,301540,301542,301628: Traffic scheduling
updates.

301516:
cxgbetool: Allow max-rate > 10Gbps for rate-limited traffic.

301520:
cxgbe(4): Create a reusable struct type for scheduling class parameters.

301531:
cxgbe(4): Break up set_sched_class. Validate the channel number and
min/max rates against their actual limits (which are chip and port
specific) instead of hardcoded constants.

301535:
cxgbe(4): Track the state of the hardware traffic schedulers in the
driver. This works as long as everyone uses set_sched_class_params
to program them.

301540:
cxgbe(4): Provide information about traffic classes in the sysctl mib.

301542:
cxgbe(4): A couple of fixes to set_sched_queue.

- Validate the scheduling class against the actual limit (which is chip
specific) instead of a magic number.

- Return an error if an attempt is made to manipulate the tx queues of a
VI that hasn't been initialized.

301628:
cxgbe(4): Add a sysctl to manage the binding of a txq to a traffic class.

Sponsored by: Chelsio Communications

MFC 297776,297777,297779: Add DDB commands to cxgbe(4).

297776:
Add a function to lookup a device_t object by name.

This just walks the global list of devices looking for one with the
requested name. The one use case outside of devctl2's implementation
is for DDB commands that wish to lookup devices by name.

297777:
Add a 'show t4 tcb <nexus> <tid>' command to dump a TCB from DDB.

This allows the contents of a TCB to be extracted from a T4/T5 card in
DDB after a panic.

297779:
Add a 'show t4 devlog <nexus>' DDB command.

This command displays the adapter's firmware device log similar to the
dev.<nexus>.misc.devlog sysctl.

Sponsored by: Chelsio Communications

MFC 296975: cxgbe(4): Tidy up PAUSE frame accounting.

Figure out if the chip is counting PAUSE frames in the "normal" stats
and take them out if it is. This fixes a bug in the tx stats because
the default hardware behavior is different for Tx and Rx but the driver
was treating both the same way. The result was that OPACKETS, OBYTES,
and OMCASTS were under-reported (if tx_pause > 0) before this change.

Note that the mac_stats sysctl still gives you the raw value of these
statistics straight from the device registers.

Sponsored by: Chelsio Communications

MFC 296950,296951: Configuration updates.

296950:
cxgbe(4): Update some register settings in the default configuration
files to match the "uwire" configuration.

296951:
cxgbe(4): Enable additional capabilities in the default configuration
files. All features with FreeBSD drivers of some kind are now in the
default configuration.

Sponsored by: Chelsio Communications

MFC 296018,296640,296641,296689,296735,296949: Fixes for sysctl handlers.

296018:
cxgbe(4): Add a sysctl to retrieve the maximum speed/bandwidth supported by a
port.

dev.cxgbe.<n>.max_speed
dev.cxl.<n>.max_speed

296640:
cxgbe(4): Add a sysctl for the event capture mask of the TP block's
logic analyzer.

dev.t5nex.<n>.misc.tp_la_mask
dev.t4nex.<n>.misc.tp_la_mask

296641:
cxgbe(4): Add sysctls to display the TP microcode version and the
expansion rom version (if there's one).

trantor:~# sysctl dev.t4nex dev.t5nex | grep _version
dev.t4nex.0.firmware_version: 1.15.28.0
dev.t4nex.0.tp_version: 0.1.9.4
dev.t5nex.0.firmware_version: 1.15.28.0
dev.t5nex.0.exprom_version: 1.0.0.68
dev.t5nex.0.tp_version: 0.1.4.9

296689:
cxgbe(4): sysctls to display the TOE's TCP timers.

cask:~# sysctl -d dev.t5nex.0.toe
dev.t5nex.0.toe.finwait2_timer: FINWAIT2 timer (us)
dev.t5nex.0.toe.initial_srtt: Initial SRTT (us)
dev.t5nex.0.toe.keepalive_intvl: Keepidle interval (us)
dev.t5nex.0.toe.keepalive_idle: Keepidle idle timer (us)
dev.t5nex.0.toe.persist_max: Persist timer max (us)
dev.t5nex.0.toe.persist_min: Persist timer min (us)
dev.t5nex.0.toe.rexmt_max: Retransmit max (us)
dev.t5nex.0.toe.rexmt_min: Retransmit min (us)
dev.t5nex.0.toe.dack_timer: DACK timer (us)
dev.t5nex.0.toe.dack_tick: DACK tick (us)
dev.t5nex.0.toe.timestamp_tick: TCP timestamp tick (us)
dev.t5nex.0.toe.timer_tick: TP timer tick (us)
...

cask:~# sysctl dev.t5nex.0.toe
dev.t5nex.0.toe.finwait2_timer: 9765440
dev.t5nex.0.toe.initial_srtt: 244128
dev.t5nex.0.toe.keepalive_intvl: 73240800
dev.t5nex.0.toe.keepalive_idle: 7031116800
dev.t5nex.0.toe.persist_max: 9765440
dev.t5nex.0.toe.persist_min: 976544
dev.t5nex.0.toe.rexmt_max: 9765440
dev.t5nex.0.toe.rexmt_min: 244128
dev.t5nex.0.toe.dack_timer: 19520
dev.t5nex.0.toe.dack_tick: 32.768
dev.t5nex.0.toe.timestamp_tick: 1048.576
dev.t5nex.0.toe.timer_tick: 32.768
...

296735:
Fix the following gcc warnings on sparc64, when TCP_OFFLOAD is not
defined:

sys/dev/cxgbe/t4_main.c:7474: warning: 'sysctl_tp_tick' defined but not used
sys/dev/cxgbe/t4_main.c:7505: warning: 'sysctl_tp_dack_timer' defined but not used
sys/dev/cxgbe/t4_main.c:7519: warning: 'sysctl_tp_timer' defined but not used

This just adds a bunch of #ifdef TCP_OFFLOAD in the right places.

296949:
cxgbe(4): Remove a couple of pointless assignments in sysctl_meminfo.
Do not display range if start = stop (this is a workaround for some
unused regions).

Sponsored by: Chelsio Communications

MFC 296552,296596,296603,296624,296627: Fixes related to memory windows.

296552:
cxgbe(4): Rename regwin_lock to reg_lock. It is used to protect access
to indirect registers only.

296596:
cxgbe(4): Allow the addr/len pair that is being validated in
validate_mem_range to span multiple memory types. Update
validate_mt_off_len to use validate_mem_range.

296603:
cxgbe(4): Add general purpose routines that offer safe access to the
chip's memory windows. Convert existing users of these windows to the
new routines.

296624:
cxgbe(4): Fix bug in r296603. The memory window needs to be
repositioned if the start address isn't in the window already. One
of the bounds check used the end address instead.

296627:
cxgbe(4): Improvements to the code that deals with the firmware's log.

- Query the location of the log very early during attach. Refresh the
location later after establishing contact with the firmware.
- Save the log's location as a flat address in devlog_params.
- Use a memory window instead of backdoor access to the EDC/MC to read
the log.

Sponsored by: Chelsio Communications

MFC 295778,296249,296333,296383,296471,296478,296481,296485,296488-296491,
296493-296496,296544,296710-296711,297863,299685: Catch up to changes to
the internal shared code.

Note that this merge includes two different firmware updates, but the
effective change is to update to the last version (1.15.37.0). As such,
I've trimmed the log message of the first update (1.15.28.0).

In addition, the M_WAIT macro added in t4_regs.h had to be renamed to
CXGBE_M_WAIT to avoid a collision on 10.x that is not present on 11.

295778:
cxgbe: catch up with the latest hardware-related definitions.

296249:
cxgbe(4): Update T5 and T4 firmwares to 1.15.28.0.

296333:
cxgbe(4): First of many changes to reduce diffs with internal shared
code:

- Rename some CamelCase variables.
- s/t4_link_start/t4_link_l1cfg/g
- Pull in t4_get_port_type_description.
- Move t4_wait_op_done to t4_hw.c.
- Flip the order of the RDMA stats.
- Remove unsused function t4_iq_start_stop.
- Move t4_wait_op_done and t4_wait_op_done_val to t4_hw.c

296383:
cxgbe(4): Very basic T6 awareness. This is part of ongoing work to
update to the latest internal shared code.

- Add a chip_params structure to keep track of hardware constants for
all generations of Terminators handled by cxgbe.
- Update t4_hw_pci_read_cfg4 to work with T6.
- Update the hardware debug sysctls (hidden within dev.<tNnex>.<n>.misc.*) to
work with T6. Most of the changes are in the decoders for the CIM
logic analyzer and the MPS TCAM.
- Acquire the regwin lock around indirect register accesses.

296471:
cxgbe(4): Updated register dumps.

- Get the list of registers to read during a regdump from the shared
code instead of the OS specific code. This follows a similar move
internally. The shared code includes the list for T6.

- Update cxgbetool to be able to decode T5 VF, T6, and T6 VF register
dumps (and catch up with some updates to T4 and T5 register decode).

296478:
cxgbe(4): Add a struct sge_params to store per-adapter SGE parameters.
Move the code that reads all the parameters to t4_init_sge_params in the
shared code. Use these per-adapter values instead of globals.

296481:
cxgbe(4): Overhaul the shared code that deals with the chip's TP block,
which is responsible for filtering and RSS.

Add the ability to use filters that match on PF/VF (aka "VNIC id") while
here. This is mutually exclusive with filtering on outer VLAN tag with
Q-in-Q.

296485:
cxgbe(4): Update the interrupt handlers for hardware errors.

296488:
cxgbe(4): Updates to mailbox routines in the shared code.

296489:
cxgbe(4): Updates to the shared routines that deal with the serial EEPROM,
flash, and VPD.

296490:
cxgbe(4): Remove __devinit and SPEED_<foo> as part of catch up with
internal shared code.

296491:
cxgbe(4): Updates to shared routines that get/set various parameters via
the firmware.

296493:
cxgbe(4): Use t4_link_down_rc_str in shared code to decode the reason
the link is down, instead of doing it in OS specific code.

296494:
cxgbe(4): Many new functions in the shared code, unused at this time.

296495:
cxgbe(4): Fix t4_tp_get_rdma_stats.

296496:
cxgbe(4): Minor updates to the shared routines that deal with firmware images.

296544:
cxgbe(4): Reshuffle and rototill t4_hw.c, solely to reduce diffs with
the internal shared code.

296710:
cxgbe(4): Catch up with the latest list of card capabilities as reported
by the firmware.

296711:
cxgbe(4): Fix typo in previous commit.

297863:
Rename the 'M_B' macro in t4_regs.h to 'CXGBE_M_B'.

This fixes a conflict with the M_B macro in powerpc's
<machine/db_machdep.h> exposed by the recent addition of DDB commands
to the cxgbe driver.

299685:
cxgbe(4): Update T5 and T4 firmwares to 1.15.37.0.

These firmwares were obtained from the "Chelsio T5/T4 Unified Wire
v2.12.0.3 for Linux" release. Changes since 1.14.4.0 (which is the
firmware in -STABLE branches) are in the "Release Notes" accompanying
the Unified Wire release and are copy-pasted here as well.

22.1. T5 Firmware
+++++++++++++++++++++++++++++++++

Version : 1.15.37.0
Date : 04/27/2016
================================================================================

FIXES
-----

BASE:
- Fixed an issue in FW_RSS_VI_CONFIG_CMD handling where the default ingress
queue was ignored.
- Fixed an issue where adapter failed to load fw by adjusting DRAM frequency.
- Fixed an issue in watchdog which was causing VM bring-up failure after reboot.
- Fixed 40G link failures with some switches when auto-negotiation enabled.
- Fixed to improve on link bring-up time.
- Per port buffer groups size doubled to improve performance.
- Fixed an issue where bogus d3hot bits were set causing traffic stall.
- Fixed an issue where sometimes adapter was not seen after reboot.
- Fixed an issue where iWARP was crashing in conjunction with traffic management.
- Fixed an issue where link failed to come up after removing twinax cable and
inserting optical module.

ETH
- Fixed a link flap issue on T580-CR.

OFLD
- Fixed a potential iSCSI data corruption issue by disabling RxFragEn flag.

FOiSCSI
- Fixed an issue in recovery path where connection was getting closed before
recovery processing was done.
- Fixed an issue in TCP port reuse.
- Fixed an issue in recovery path when large number (>64) of iSCSI connections
were in use.
- Returned ENETUNREACH if IP was not been provisioned yet and driver tried to
use given inerface.
- Fixed an issue where fw was sending ENETUNREACH event for normal tcp
disconnection.

DCBX
- Fixed an issue where iscsi tlv is sent incorrectly to host. (DCBX CEE)
- Fixed an issue where apply bit set for APP id was affecting the ETS and PFC
settings.(DCBX IEEE)
- Fixed an issue where app priority values are not handled correctly in fw.
(DCBX IEEE)
- Fixed an issue where enable/disable dcbx can cause crash. (DCBX CEE,DCBX IEEE)

FOFCoE
- Removed BB6 support.

ENHANCEMENTS
------------

BASE:
- Added new interface to program DCA settings in SGE contexts; allow 32-byte
IQE size
- Added PTP interface fw_ptp_ts to support PTP Frequeny and Offset adjustment.
- Added MPS raw interface.

ETH:
- New mailbox command FW_DCB_IEEE_CMD api added for IEEE dcbx.

OFLD:
- WR opcode is returned to host in cqe error response.

22.2. T4 Firmware
+++++++++++++++++

Version : 1.15.37.0
Date : 04/27/2016
================================================================================

FIXES
-----

BASE:
- Fixed an issue in FW_RSS_VI_CONFIG_CMD handling where default ingress queue
was ignored.
- Fixed an issue in watchdog which was causing VM bring-up failure after reboot.
- Per port buffer groups size doubled to improve performance.
- Fixed an issue where iWARP was crashing in conjunction with traffic management.

FOiSCSI:
- Fixed an issue in recovery path where connection was getting closed before
recovery processing was done.
- Fixed an issue in TCP port reuse.
- Fixed an issue in recovery path when large number (>64) of iSCSI connections
were in use.
- Returned ENETUNREACH if IP had not been provisioned yet and driver tried to
use given inerface.

DCBX
- Fixed an issue where iscsi tlv is sent incorrectly to host.(DCBX CEE)
- Fixed an issue where enable/disable dcbx can cause crash in firmware.(DCBX CEE)

FOiSCSI
- Fixes an issue where fw was sending ENETUNREACH event for normal tcp
disconnection.

FOFCoE
- Removed BB6 support.

ENHANCEMENTS
------------

BASE:
- Added MPS raw interface.

ETH:
- New mailbox command FW_DCB_IEEE_CMD api added for IEEE dcbx.
================================================================================

Sponsored by: Chelsio Communications

MFC 295573: Remove duplicate definition (CPL_TRACE_PKT_T5).

Sponsored by: Chelsio Communications

MFC 291665,291685,291856,297467,302110,302263: Add support for VIs.

291665:
Add support for configuring additional virtual interfaces (VIs) on a port.

Each virtual interface has its own MAC address, queues, and statistics.
The dedicated netmap interfaces (ncxgbeX / ncxlX) were already implemented
as additional VIs on each port. This change allows additional non-netmap
interfaces to be configured on each port. Additional virtual interfaces
use the naming scheme vcxgbeX or vcxlX.

Additional VIs are enabled by setting the hw.cxgbe.num_vis tunable to a
value greater than 1 before loading the cxgbe(4) or cxl(4) driver.
NB: The first VI on each port is the "main" interface (cxgbeX or cxlX).

T4/T5 NICs provide a limited number of MAC addresses for each physical port.
As a result, a maximum of six VIs can be configured on each port (including
the "main" interface and the netmap interface when netmap is enabled).

One user-visible result is that when netmap is enabled, packets received
or transmitted via the netmap interface are no longer counted in the stats
for the "main" interface, but are not accounted to the netmap interface.

The netmap interfaces now also have a new-bus device and export various
information sysctl nodes via dev.n(cxgbe|cxl).X.

The cxgbetool 'clearstats' command clears the stats for all VIs on the
specified port along with the port's stats. There is currently no way to
clear the stats of an individual VI.

291685:
Fix build for !TCP_OFFLOAD case.

291856:
Fix RSS build.

297467:
Remove #ifdef's from various structures used in the cxgbe/cxl driver.

This provides a constant ABI and layout for these structures (especially
struct adapter) avoiding some foot shooting.

302110:
cxgbe(4): Merge netmap support from the ncxgbe/ncxl interfaces to the
vcxgbe/vcxl interfaces and retire the 'n' interfaces. The main
cxgbe/cxl interfaces and tunables related to them are not affected by
any of this and will continue to operate as usual.

The driver used to create an additional 'n' interface for every
cxgbe/cxl interface if "device netmap" was in the kernel. The 'n'
interface shared the wire with the main interface but was otherwise
autonomous (with its own MAC address, etc.). It did not have normal
tx/rx but had a specialized netmap-only data path. r291665 added
another set of virtual interfaces (the 'v' interfaces) to the driver.
These had normal tx/rx but no netmap support.

This revision consolidates the features of both the interfaces into the
'v' interface which now has a normal data path, TOE support, and native
netmap support. The 'v' interfaces need to be created explicitly with
the hw.cxgbe.num_vis tunable. This means "device netmap" will not
result in the automatic creation of any virtual interfaces.

The following tunables can be used to override the default number of
queues allocated for each 'v' interface. nofld* = 0 will disable TOE on
the virtual interface and nnm* = 0 to will disable native netmap
support.

# number of normal NIC queues
hw.cxgbe.ntxq_vi
hw.cxgbe.nrxq_vi

# number of TOE queues
hw.cxgbe.nofldtxq_vi
hw.cxgbe.nofldrxq_vi

# number of netmap queues
hw.cxgbe.nnmtxq_vi
hw.cxgbe.nnmrxq_vi

hw.cxgbe.nnm{t,r}xq{10,1}g tunables have been removed.

--- tl;dr version ---
The workflow for netmap on cxgbe starting with FreeBSD 11 is:
1) "device netmap" in the kernel config.
2) "hw.cxgbe.num_vis=2" in loader.conf. num_vis > 2 is ok too, you'll
end up with multiple autonomous netmap-capable interfaces for every
port.
3) "dmesg | grep vcxl | grep netmap" to verify that the interface has
netmap queues.
4) Use any of the 'v' interfaces for netmap. pkt-gen -i vcxl<n>... .
One major improvement is that the netmap interface has a normal data
path as expected.
5) Just ignore the cxl interfaces if you want to use netmap only. No
need to bring them up. The vcxl interfaces are completely independent
and everything should just work.
---------------------

302263:
cxgbe(4): Do not bring up an interface when IFCAP_TOE is enabled on it.
The interface's queues are functional after VI_INIT_DONE (which is short
of interface-up) and that's all that's needed for t4_tom to communicate
with the chip.

Relnotes: yes
Sponsored by: Chelsio Communications

MFC 289401: cxgbe(4): support for the kernel RSS option.

You need PCBGROUP and RSS in the kernel config to use this.

Note: Since RSS is not present in 10.x this is mostly a no-op and is
stubbed out by removing the #include of opt_rss.h. This is merged
primarily to reduce conflicts in future merges, however it does add a
couple of diagnostic messages related to RSS buckets vs RX queue
counts.

Discussed with: np
Sponsored by: Chelsio Communications

MFC 282039: Don't use ifm_data. It was used only for self checking debug.

Sponsored by: Chelsio Communications

MFC r277759 (by jhb@)

Fix a couple of panics when detaching from a cxgbe/cxl interface that was
never brought up:
- Allow NULL to be passed to sglist_free().
- Don't try to stop an interface that was never fully initialized.

PR: 208136

MFC 290416:
Chelsio T5 chips do not properly echo the No Snoop and Relaxed Ordering
attributes when replying to a TLP from a Root Port. As a workaround,
disable No Snoop and Relaxed Ordering in the Root Port of each T5 adapter
during attach so that CPU-initiated requests do not contain these flags.

Note that this affects CPU-initiated requests to all devices under this
root port.

Sponsored by: Chelsio

MFC r286926:

cxgbe(4): Save the flags for the last adapter-wide synchronized
operation that was initiated successfully. (The caller and thread are
already recorded).

MFC r271490:
cxgbe(4): add support for the SIOCGI2C ioctl.

MFC r285527 and r286338. This takes the firmware from 1.11.27.0 to 1.14.4.0.

r286338:
cxgbe(4): Update T5 and T4 firmwares bundled with the driver to 1.14.4.0. The
changes in the firmwares since 1.11.27.0 are listed here (straight copy-paste
from the "Release Notes.txt" accompanying the Chelsio Unified Wire 2.11.1.0
release on the website).

22.1. T5 Firmware
+++++++++++++++++++++++++++++++++

Version : 1.14.4.0
Date : 08/05/2015
================================================================================

FIXES
-----

BASE:
- Fixes a potential data path hang by properly programming PMTX congestion
threshold settings.
- Fixes a potential initialization error when accessing a configuration file
stored on the flash.
- Fixes a regression where SGE resources can be miss-sized if iWARP is disabled.

ETH:
- Fixes a timing issue that would prevent CR4 links from coming up with some
switches.

FOFCoE:
- Defers fcoe linkdown mailbox command handling till LOGO is sent.
- Updates vlan prio for all outstanding IOs during dcbx update.

ENHANCEMENTS
------------

BASE:
- Adds support for PAUSE OFF watchdog.
- Reports devlog access information in PCIE_FW_PF register 7.

ETH:
- Enhances segmentation offload to include VxLAN and Geneve.
- Adds PTP support.
- Adds new interface to allow the driver to query the VI rss table base
addresses.
- Allows the driver to program the SGE ingrext contxt CongDrop field.

OFLD:
- Adds new interface for the driver to specify offloaded connections TCP snd
and rcv scale factors.

iSCSI:
- Adds support for iscsi segmentatation offload (ISO).
- Adds support for iscsi t10-dif offload.

FOiSCSI:
- Sets FORCE_BIT for cut through processing for FOiSCSI.

FOFCoE:
- Adds support for FCoE BB6.
- Improves WRITE performance.

================================================================================
================================================================================

Version : 1.13.32.0
Date : 03/25/2015
================================================================================

FIXES
-----

BASE:
- Fixes FW_CAPS_CONFIG_CMD return value on error (was positive instead of
negative)
- Fixes FW_PARAMS_PARAM_DEV_FLOWC_BUFFIFO_SZ indication (was wrong on certain
adapter configurations)
- Fixes config file based PL_TIMEOUT register programming

ETH:
- Fixes a potential EO UDP SEG header corruption
- Fixes an issue where 1000Base-X was not enabled correctly when using QSA
modules

OFLD:
- Fixes timeout issue with half-open connections
- Fixes FW_FLOWC_WR processing when state is set to finwait1

FOFCoE:
- Fixes fcoe xchg leaks in linkdown/peer down path
- Fixes cleanup in FCoE linkdown and fixed buf timer flowid abuse
- Fixes fw crash by clearing fcf flowc during bye

FOiSCSI:
- Don't create a new tcp socket if ERL0 attempt has timed out.

ENHANCEMENTS
------------

BASE:
- Adds support for VFs on PFs 4 to 7
- Adds support for QPs/CQs on any physical and virtual function

ETH:
- Stops sending LACP frames on loopback interface
- Adds an AUTOEQU indication to CPL_SGE_EGR_UPDATE
- Adds support for CR4 links (BEAN/AEC on 40G TwinAx cables)

OFLD:
- Improves default settings of LAN and CLUSTER TCP timer settings
- Sends Negative Advice CPLs to software

FOISCSI:
- Adds IPv6 support for foiscsi. Keeps backward compatibility with
old foiscsi drivers which doesn't support ipv6.

FOFCoE:
- Added fcoe debug support in flowc dump

================================================================================
================================================================================

Version : 1.12.25.0
Date : 10/22/2014
================================================================================

FIXES
-----

BASE:
- Improves precision of the Weight Round Robing Traffic Management Algorithm
- Fixes an issue where the link would intermittently fail to come up
- Fixes an issue where adapters with an external PHY couldn't run at 100Mbps
- Fixes an issue where active optical cables were not recognized
- Fixes link advertising issues on T520-BT (speed and pause frames) that would
cause the link to negotiate unexpected settings
- Forces link restart when auto-negotiation is disabled
- Fix an issue where pause frames wouldn't be fully disabled even if requested

ETH:
- Fixes NVGRE Segmentation Offload network header generation.

DCBX:
- Fixes an issue where some settings were not being sent to the switch
correctly
- Fixes an issue where back-to-back DCBX port updates could get overwritten by
FW
- Fixes a firmware crash on DCBX APP information request before link up

FOiSCSI:
- Fixes abort task leak in tmf response handling
- Fixes TCP RST handling while in iSCSI ERL0
- Fixes a firmware crash on BYE without INIT

ENHANCEMENTS
-------------

BASE:
- Adds link partner settings reporting when available
- Adds QSA support (in conjunction with QSA VPD)
- Adds T520-BT LED support
- Reports NOTSUPPORTED for modules with an unhandled identifier

DCBX:
- Adds version reporting (indicating which version FW is trying to negotiate)
- Adds IEEE support
- Reports LLDP time outs

FOiSCSI:
- Add support for multiple iSCSI DDP client
- Sends DHCP renew request when lease expires

================================================================================

22.2. T4 Firmware
+++++++++++++++++

Version : 1.14.4.0
Date : 08/05/2015
================================================================================

FIXES
-----

BASE:
- Fixes a potential initialization error when accessing a configuration file
stored on the flash.
- Initialize PCIE_DBG_INDIR_REQ.Enable to 0, as hardware failed to do so and
register dumps could result in errors.

ETH:
- Fixes an issue that sometimes prevented the link from coming up in CR adapters.

ENHANCEMENTS
------------

BASE:
- Adds support for PAUSE OFF watchdog.
- Reports devlog access information in PCIE_FW_PF register 7.

ETH:
- Adds new interface to allow the driver to query the VI rss table base
addresses.

OFLD:
- Adds new interface for the driver to specify offloaded connections TCP snd
and rcv scale factors.

================================================================================
================================================================================

Version : 1.13.32.0
Date : 03/25/2015
================================================================================

FIXES
-----

BASE:
- Fixes FW_CAPS_CONFIG_CMD return value on error (was positive instead of
negative)
- Fixes FW_PARAMS_PARAM_DEV_FLOWC_BUFFIFO_SZ indication (was wrong on certain
adapter configurations)
- Fixes config file based PL_TIMEOUT register programming

ETH:
- Fixes a potential EO UDP SEG header corruption

OFLD:
- Fixes timeout issue with half-open connections
- Fixes FW_FLOWC_WR processing when state is set to finwait1

FOiSCSI:
- Don't create a new tcp socket if ERL0 attempt has timed out.

ENHANCEMENTS
------------

ETH:
- Stops sending LACP frames on loopback interface
- Adds an AUTOEQU indication to CPL_SGE_EGR_UPDATE

OFLD:
- Improves default settings of LAN and CLUSTER TCP timer settings
- Sends Negative Advice CPLs to software

================================================================================
================================================================================

Version : 1.12.25.0
Date : 10/22/2014
================================================================================

FIXES
-----

BASE:
- Improves precision of the Weight Round Robing Traffic Management Algorithm
- Forces link restart when auto-negotiation is disabled
- Fix an issue where pause frames wouldn't be fully disabled even if requested

DCBX:
- Fixes an issue where some settings were not being sent to the switch
correctly
- Fixes an issue where back-to-back DCBX port updates could get overwritten by
FW
- Fixes a firmware crash on DCBX APP information request before link up

FOiSCSI:
- Fixes abort task leak in tmf response handling
- Fixes TCP RST handling while in iSCSI ERL0
- Fixes a firmware crash on BYE without INIT

ENHANCEMENTS
------------

BASE:
- Adds link partner settings reporting when available
- Firmware now reports NOTSUPPORTED for modules with an unhandled identifier

DCBX:
- Adds version reporting (indicating which version FW is trying to negotiate)
- Adds IEEE support
- Reports LLDP time outs

FOiSCSI:
- Adds support for multiple iSCSI DDP clients
- Sends DHCP renew request when lease expires

================================================================================

Obtained from: Chelsio Communications
Sponsored by: Chelsio Communications

MFC r284445 and r286107.

r284445:
cxgbe(4): Add the ability to dump mailbox commands and replies. It is
enabled/disabled via bit 0 of adapter->debug_flags (which is available
at dev.t5nex.<n>.debug_flags).

r286107:
cxgbe(4): initialize debug_flags from the kernel environment.

MFC r259150 (by adrian@) and r283864.

r259150:
Print out the full PCIe link negotiation during dmesg.

I found this useful when checking whether a NIC is in a PCIE 3.0 8x slot
or not.

r283864:
cxgbe: no need to display the per-lane GT/s rating of the pcie link.

MFC r278239 and r278374.

r278239:
cxgbe(4): reserve id for iSCSI upper layer driver.

r278374:
cxgbe(4): tidy up some of the interaction between the Upper Layer
Drivers (ULDs) and the base if_cxgbe driver.

Track the per-adapter activation of ULDs in a new "active_ulds" field.
This was done pretty arbitrarily before this change -- via TOM_INIT_DONE
in adapter->flags for TOM, and the (1 << MAX_NPORTS) bit in
adapter->offload_map for iWARP.

iWARP and hw-accelerated iSCSI rely on the TOE (supported by the TOM
ULD). The rules are:
a) If the iWARP and/or iSCSI ULDs are available when TOE is enabled then
iWARP and/or iSCSI are enabled too.
b) When the iWARP and iSCSI modules are loaded they go looking for
adapters with TOE enabled and enable themselves on that adapter.
c) You cannot deactivate or unload the TOM module from underneath iWARP
or iSCSI. Any such attempt will fail with EBUSY.

MFC r276480, r276485, r276498, r277225, r277226, r277227, r277230,
r277637, and r283149 (by emaste@).

r276485 is the real change here, the rest deal with the fallout of
mp_ring's reliance on 64b atomics.

Use the incorrectly spelled 'eigth' from struct pkthdr in this branch
instead of MFC'ing r261733, which would have renamed the field of a
public structure in a -STABLE branch.
---

r276480:
Temporarily unplug cxgbe(4) from !amd64 builds.

r276485:
cxgbe(4): major tx rework.

a) Front load as much work as possible in if_transmit, before any driver
lock or software queue has to get involved.

b) Replace buf_ring with a brand new mp_ring (multiproducer ring). This
is specifically for the tx multiqueue model where one of the if_transmit
producer threads becomes the consumer and other producers carry on as
usual. mp_ring is implemented as standalone code and it should be
possible to use it in any driver with tx multiqueue. It also has:
- the ability to enqueue/dequeue multiple items. This might become
significant if packet batching is ever implemented.
- an abdication mechanism to allow a thread to give up writing tx
descriptors and have another if_transmit thread take over. A thread
that's writing tx descriptors can end up doing so for an unbounded
time period if a) there are other if_transmit threads continuously
feeding the sofware queue, and b) the chip keeps up with whatever the
thread is throwing at it.
- accurate statistics about interesting events even when the stats come
at the expense of additional branches/conditional code.

The NIC txq lock is uncontested on the fast path at this point. I've
left it there for synchronization with the control events (interface
up/down, modload/unload).

c) Add support for "type 1" coalescing work request in the normal NIC tx
path. This work request is optimized for frames with a single item in
the DMA gather list. These are very common when forwarding packets.
Note that netmap tx in cxgbe already uses these "type 1" work requests.

d) Do not request automatic cidx updates every 32 descriptors. Instead,
request updates via bits in individual work requests (still every 32
descriptors approximately). Also, request an automatic final update
when the queue idles after activity. This means NIC tx reclaim is still
performed lazily but it will catch up quickly as soon as the queue
idles. This seems to be the best middle ground and I'll probably do
something similar for netmap tx as well.

e) Implement a faster tx path for WRQs (used by TOE tx and control
queues, _not_ by the normal NIC tx). Allow work requests to be written
directly to the hardware descriptor ring if room is available. I will
convert t4_tom and iw_cxgbe modules to this faster style gradually.

r276498:
cxgbe(4): remove buf_ring specific restriction on the txq size.

r277225:
Make cxgbe(4) buildable with the gcc in base.

r277226:
Allow cxgbe(4) to be built on i386. Driver attach will succeed only on
a subset of i386 systems.

r277227:
Plug cxgbe(4) back into !powerpc && !arm builds, instead of building it
on amd64 only.

r277230:
Build cxgbe(4) on powerpc64 too.

r277637:
Make sure the compiler flag to get cxgbe(4) to compile with gcc is used
only when gcc is being used. This is what r277225 should have been.

Backport some parts of r272200.
- a lock to protect indirect register access
- put code that deals with stats in a separate cxgbe_refresh_stats.

This is a direct commit to stable/10.

MFC r272183:

Make sure the adapter's management queue and the event queue are
available before any uppper layer driver (TOE, iWARP, or iSCSI)
registers with the base cxgbe(4) driver.

MFC r272051:

cxgbe(4): Verify that the addresses in if_multiaddrs really are multicast
addresses. (The chip doesn't really care, it's just that it needs to be
told explicitly if unicast DMACs are checked for "hits" in the hash that
is used after the TCAM entries are all used up).

MFC r275358 r275483 r276982 - Removing M_FLOWID by hps@

r275358:
Start process of removing the use of the deprecated "M_FLOWID" flag
from the FreeBSD network code. The flag is still kept around in the
"sys/mbuf.h" header file, but does no longer have any users. Instead
the "m_pkthdr.rsstype" field in the mbuf structure is now used to
decide the meaning of the "m_pkthdr.flowid" field. To modify the
"m_pkthdr.rsstype" field please use the existing "M_HASHTYPE_XXX"
macros as defined in the "sys/mbuf.h" header file.

This patch introduces new behaviour in the transmit direction.
Previously network drivers checked if "M_FLOWID" was set in "m_flags"
before using the "m_pkthdr.flowid" field. This check has now now been
replaced by checking if "M_HASHTYPE_GET(m)" is different from
"M_HASHTYPE_NONE". In the future more hashtypes will be added, for
example hashtypes for hardware dedicated flows.

"M_HASHTYPE_OPAQUE" indicates that the "m_pkthdr.flowid" value is
valid and has no particular type. This change removes the need for an
"if" statement in TCP transmit code checking for the presence of a
valid flowid value. The "if" statement mentioned above is now a direct
variable assignment which is then later checked by the respective
network drivers like before.

r275483:
Remove M_FLOWID from SCTP code.

r276982:
Remove no longer used "M_FLOWID" flag from mbuf.h and update the netisr
manpage.

Note: The FreeBSD version has been bumped.

Reviewed by: hps, tuexen
Sponsored by: Limelight Networks

MFC r278485:

cxgbe(4): allow the SET_FILTER_MODE ioctl to change the mode when it's
safe to do so.

MFC r280403:

cxgbe(4): Do not call sbuf_trim on an sbuf with a drain function.

MFC r279969:

cxgbe(4): fix if_media handling for T520-BT cards. 1Gbps and 100Mbps
are valid for this card.

MFC r278372:

cxgbe(4): adapter_full_init is always a synchronized operation.

MFC r278371:

cxgbe(4): a change to the synchronization rules within the the driver.
This is purely cosmetic because the new rules are already followed.

MFC r278342:

cxgbe(4): fix a test made while enabling TOE.

MFC r276597:

cxgbe/tom: do not engage the TOE's payload chopper for payload < 2 MSS
or for 10Gbps ports.

MFC r276728:

cxgbe(4): fix the description of a strange bunch of counters.

MFC r274456:

Fix some bad interaction between cxgbe(4) and lacp lagg(4) that could
leave a port permanently disabled when a copper cable is unplugged and
then plugged right back in.

lacp_linkstate goes looking for the current ifmedia on a link state
change and it could get stale information from cxgbe(4) on a module
unplug followed by replug. The fix is to process module events before
link-state events within the driver, and to always rebuild the ifmedia
list on a module change event (instead of rebuilding it lazily).

Thanks to asomers@ for the problem report and detailed analysis to go
with it.

MFC 274402:
Add device ID for the T502-BT (dual-port 1G) adapter.

MFC r274724:
cxgbe(4): figure out the max payload size and save it for later.

MFC r272190:

cxgbe(4): explicitly set various if_hw_tso* values.

MFC r263710, r273377, r273378, r273423 and r273455:

- De-vnet hash sizes and hash masks.
- Fix multiple issues related to arguments passed to SYSCTL macros.

Sponsored by: Mellanox Technologies

MFC r271450:
cxgbe(4): knobs to enable/disable PAUSE frame based flow control.

Approved by: re (glebius)

MFC r266571, r266757, r268536, r269076, r269364, r269366, r269411,
r269413, r269428, r269440, r269537, r269644, r269731, and the cxgbe
portion of r270063.

r266571:
cxgbe(4): Remove stray if_up from the code that creates the tracing ifnet.

r266757:
cxgbe(4): netmap support for Terminator 5 (T5) based 10G/40G cards.
Netmap gets its own hardware-assisted virtual interface and won't take
over or disrupt the "normal" interface in any way. You can use both
simultaneously.

For kernels with DEV_NETMAP, cxgbe(4) carves out an ncxl<N> interface
(note the 'n' prefix) in the hardware to accompany each cxl<N>
interface. These two ifnet's per port share the same wire but really
are separate interfaces in the hardware and software. Each gets its own
L2 MAC addresses (unicast and multicast), MTU, checksum caps, etc. You
should run netmap on the 'n' interfaces only, that's what they are for.

With this, pkt-gen is able to transmit > 45Mpps out of a single 40G port
of a T580 card. 2 port tx is at ~56Mpps total (28M + 28M) as of now.
Single port receive is at 33Mpps but this is very much a work in
progress. I expect it to be closer to 40Mpps once done. In any case
the current effort can already saturate multiple 10G ports of a T5 card
at the smallest legal packet size. T4 gear is totally untested.

trantor:~# ./pkt-gen -i ncxl0 -f tx -D 00:07:43:ab:cd:ef
881.952141 main [1621] interface is ncxl0
881.952250 extract_ip_range [275] range is 10.0.0.1:0 to 10.0.0.1:0
881.952253 extract_ip_range [275] range is 10.1.0.1:0 to 10.1.0.1:0
881.962540 main [1804] mapped 334980KB at 0x801dff000
Sending on netmap:ncxl0: 4 queues, 1 threads and 1 cpus.
10.0.0.1 -> 10.1.0.1 (00:00:00:00:00:00 -> 00:07:43:ab:cd:ef)
881.962562 main [1882] Sending 512 packets every 0.000000000 s
881.962563 main [1884] Wait 2 secs for phy reset
884.088516 main [1886] Ready...
884.088535 nm_open [457] overriding ifname ncxl0 ringid 0x0 flags 0x1
884.088607 sender_body [996] start
884.093246 sender_body [1064] drop copy
885.090435 main_thread [1418] 45206353 pps (45289533 pkts in 1001840 usec)
886.091600 main_thread [1418] 45322792 pps (45375593 pkts in 1001165 usec)
887.092435 main_thread [1418] 45313992 pps (45351784 pkts in 1000834 usec)
888.094434 main_thread [1418] 45315765 pps (45406397 pkts in 1002000 usec)
889.095434 main_thread [1418] 45333218 pps (45378551 pkts in 1001000 usec)
890.097434 main_thread [1418] 45315247 pps (45405877 pkts in 1002000 usec)
891.099434 main_thread [1418] 45326515 pps (45417168 pkts in 1002000 usec)
892.101434 main_thread [1418] 45333039 pps (45423705 pkts in 1002000 usec)
893.103434 main_thread [1418] 45324105 pps (45414708 pkts in 1001999 usec)
894.105434 main_thread [1418] 45318042 pps (45408723 pkts in 1002001 usec)
895.106434 main_thread [1418] 45332430 pps (45377762 pkts in 1001000 usec)
896.107434 main_thread [1418] 45338072 pps (45383410 pkts in 1001000 usec)
...

r268536:
cxgbe(4): Add an iSCSI softc to the adapter structure.

r269076:
Some hooks in cxgbe(4) for the offloaded iSCSI driver.

r269364:
Improve compliance with style.Makefile(5).

r269366:
List one file per line in the Makefiles. This makes it easier to read
diffs when a file is added or removed.

r269411:
cxgbe(4): minor optimizations in ingress queue processing.

Reorganize struct sge_iq. Make the iq entry size a compile time
constant. While here, eliminate RX_FL_ESIZE and use EQ_ESIZE directly.

r269413:
cxgbe(4): Fix an off by one error when looking for the BAR2 doorbell
address of an egress queue.

r269428:
cxgbe(4): some optimizations in freelist handling.

r269440:
cxgbe(4): Remove an unused version of t4_enable_vi.

r269537:
cxgbe(4): Do not run any sleepable code in the SIOCSIFFLAGS handler when
IFF_PROMISC or IFF_ALLMULTI is being flipped. bpf(4) holds its global
mutex around ifpromisc in at least the bpf_dtor path.

r269644:
cxgbe(4): Let caller specify whether it's ok to sleep in
t4_sched_config and t4_sched_params.

r269731:
cxgbe(4): Do not poke T4-only registers on a T5 (and vice versa).

Relnotes: Yes (native netmap support for Chelsio T4/T5 cards)

MFC r268971 and r269032.

r268971:
Simplify r267600, there's no need to distinguish between allocated and
inlined mbufs.

r269032:
cxgbe(4): Keep track of the clusters that have to be freed by the
custom free routine (rxb_free) in the driver. Fail MOD_UNLOAD with
EBUSY if any such cluster has been handed up to the kernel but hasn't
been freed yet. This prevents a panic later when the cluster finally
needs to be freed but rxb_free is gone from the kernel.

MFC r268640 and r268989.

r268640:
Allow multi-byte reads in the private CHELSIO_T4_GET_I2C ioctl. The
firmware allows up to 48B to be read this way but the driver limits
itself to 8B at a time to remain compatible with old cxgbetool
binaries.

r268989:
Add missing newline to an error message.

MFC r268706:
cxgbe(4): Display CF facility correctly in the device log.

MFC r259382:

Read card capabilities after firmware initialization, instead of setting
them up as part of firmware initialization (which the driver gets to do
only if it's the master driver).

Read the range of tids available for the ETHOFLD functionality if it's
enabled.

New is_ftid() and is_etid() functions to test whether a tid falls within
the range of filter tids or ETHOFLD tids respectively.

MFC r263317, r263412, and r263451.

r263317:
cxgbe(4): significant rx rework.

- More flexible cluster size selection, including the ability to fall
back to a safe cluster size (PAGE_SIZE from zone_jumbop by default) in
case an allocation of a larger size fails.
- A single get_fl_payload() function that assembles the payload into an
mbuf chain for any kind of freelist. This replaces two variants: one
for freelists with buffer packing enabled and another for those without.
- Buffer packing with any sized cluster. It was limited to 4K clusters
only before this change.
- Enable buffer packing for TOE rx queues as well.
- Statistics and tunables to go with all these changes. The driver's
man page will be updated separately.

r263412:
cxgbe(4): if_iqdrops statistic should include tunnel congestion drops.

r263451:
cxgbe(4): man page updates.

MFC r260210 (by adrian@):
Add an option to enable or disable the small RX packet copying that
is done to improve performance of small frames.

When doing RX packing, the RX copying isn't necessarily required.

MFC r261533, r261536, r261537, and r263457.

r261533:
cxgbe(4): Use the port's tx channel to identify it to t4_clr_port_stats.

r261536:
cxgbe(4): The T5 allows for a different freelist starvation threshold
for queues with buffer packing. Use the correct value to calculate a
freelist's low water mark.

r261537:
cxgbe(4): Use the rx channel map (instead of the tx channel map) as the
congestion channel map.

r263457:
cxgbe(4): Recognize the "spider" configuration where a T5 card's 40G
QSFP port is presented as 4 distinct 10G SFP+ ports to the driver.

MFC r264621

use correct (integer) type for the temperature sysctl

Reviewed by: np, scottl
Obtained from: Netflix

MFC r261558

Add a new sysctl, dev.cxgbe.N.rsrv_noflow, and a companion tunable,
hw.cxgbe.rsrv_noflow. When set, queue 0 of the port is reserved for
TX packets without a flowid. The hash value of packets with a flowid
is bumped up by 1. The intent is to provide a private queue for
link-level packets like LACP that is unlikely to overflow or suffer
deep queue latency.

MFC r259145:
Unstaticize t4_list and t4_uld_list. This works around a clang
annoyance[1] and allows kgdb to find these symbols.

[1] http://lists.freebsd.org/pipermail/freebsd-hackers/2012-November/041166.html

MFC r257654, r257772, r258441, r258689, r258698, r258879, r259048, and
r259103.

r257654:
cxgbe(4): Exclude MPS_RPLC_MAP_CTL (0x11114) from the register dump. Turns
out it's a write-only register with strange side effects on read.

r257772:
cxgbe(4): Tidy up the display for payload memory statistics (pm_stats).

r258441:
cxgbe(4): update the internal list of device features.

r258689:
Disable an assertion that relies on some code[1] that isn't in HEAD yet.

r258698:
cxgbetool: "modinfo" command to display SFP+ module information.

r258879:
cxgbe(4): T4_SET_SCHED_CLASS and T4_SET_SCHED_QUEUE ioctls to program
scheduling classes in the chip and to bind tx queue(s) to a scheduling
class respectively. These can be used for various kinds of tx traffic
throttling (to force selected tx queues to drain at a fixed Kbps rate,
or a % of the port's total bandwidth, or at a fixed pps rate, etc.).

r259048:
Two new cxgbetool subcommands to set up scheduler classes and to bind
them to NIC queues.

r259103:
cxgbe(4): save a copy of the RSS map for each port for the driver's use.

MFC r256459.

cxgbe(4): Update T4 and T5 firmwares to 1.9.12.0

Approved by: re (glebius)

MFC r286926:

cxgbe(4): Save the flags for the last adapter-wide synchronized
operation that was initiated successfully. (The caller and thread are
already recorded).

MFC r271490:
cxgbe(4): add support for the SIOCGI2C ioctl.

MFC r285527 and r286338. This takes the firmware from 1.11.27.0 to 1.14.4.0.

r286338:
cxgbe(4): Update T5 and T4 firmwares bundled with the driver to 1.14.4.0. The
changes in the firmwares since 1.11.27.0 are listed here (straight copy-paste
from the "Release Notes.txt" accompanying the Chelsio Unified Wire 2.11.1.0
release on the website).

22.1. T5 Firmware
+++++++++++++++++++++++++++++++++

Version : 1.14.4.0
Date : 08/05/2015
================================================================================

FIXES
-----

BASE:
- Fixes a potential data path hang by properly programming PMTX congestion
threshold settings.
- Fixes a potential initialization error when accessing a configuration file
stored on the flash.
- Fixes a regression where SGE resources can be miss-sized if iWARP is disabled.

ETH:
- Fixes a timing issue that would prevent CR4 links from coming up with some
switches.

FOFCoE:
- Defers fcoe linkdown mailbox command handling till LOGO is sent.
- Updates vlan prio for all outstanding IOs during dcbx update.

ENHANCEMENTS
------------

BASE:
- Adds support for PAUSE OFF watchdog.
- Reports devlog access information in PCIE_FW_PF register 7.

ETH:
- Enhances segmentation offload to include VxLAN and Geneve.
- Adds PTP support.
- Adds new interface to allow the driver to query the VI rss table base
addresses.
- Allows the driver to program the SGE ingrext contxt CongDrop field.

OFLD:
- Adds new interface for the driver to specify offloaded connections TCP snd
and rcv scale factors.

iSCSI:
- Adds support for iscsi segmentatation offload (ISO).
- Adds support for iscsi t10-dif offload.

FOiSCSI:
- Sets FORCE_BIT for cut through processing for FOiSCSI.

FOFCoE:
- Adds support for FCoE BB6.
- Improves WRITE performance.

================================================================================
================================================================================

Version : 1.13.32.0
Date : 03/25/2015
================================================================================

FIXES
-----

BASE:
- Fixes FW_CAPS_CONFIG_CMD return value on error (was positive instead of
negative)
- Fixes FW_PARAMS_PARAM_DEV_FLOWC_BUFFIFO_SZ indication (was wrong on certain
adapter configurations)
- Fixes config file based PL_TIMEOUT register programming

ETH:
- Fixes a potential EO UDP SEG header corruption
- Fixes an issue where 1000Base-X was not enabled correctly when using QSA
modules

OFLD:
- Fixes timeout issue with half-open connections
- Fixes FW_FLOWC_WR processing when state is set to finwait1

FOFCoE:
- Fixes fcoe xchg leaks in linkdown/peer down path
- Fixes cleanup in FCoE linkdown and fixed buf timer flowid abuse
- Fixes fw crash by clearing fcf flowc during bye

FOiSCSI:
- Don't create a new tcp socket if ERL0 attempt has timed out.

ENHANCEMENTS
------------

BASE:
- Adds support for VFs on PFs 4 to 7
- Adds support for QPs/CQs on any physical and virtual function

ETH:
- Stops sending LACP frames on loopback interface
- Adds an AUTOEQU indication to CPL_SGE_EGR_UPDATE
- Adds support for CR4 links (BEAN/AEC on 40G TwinAx cables)

OFLD:
- Improves default settings of LAN and CLUSTER TCP timer settings
- Sends Negative Advice CPLs to software

FOISCSI:
- Adds IPv6 support for foiscsi. Keeps backward compatibility with
old foiscsi drivers which doesn't support ipv6.

FOFCoE:
- Added fcoe debug support in flowc dump

================================================================================
================================================================================

Version : 1.12.25.0
Date : 10/22/2014
================================================================================

FIXES
-----

BASE:
- Improves precision of the Weight Round Robing Traffic Management Algorithm
- Fixes an issue where the link would intermittently fail to come up
- Fixes an issue where adapters with an external PHY couldn't run at 100Mbps
- Fixes an issue where active optical cables were not recognized
- Fixes link advertising issues on T520-BT (speed and pause frames) that would
cause the link to negotiate unexpected settings
- Forces link restart when auto-negotiation is disabled
- Fix an issue where pause frames wouldn't be fully disabled even if requested

ETH:
- Fixes NVGRE Segmentation Offload network header generation.

DCBX:
- Fixes an issue where some settings were not being sent to the switch
correctly
- Fixes an issue where back-to-back DCBX port updates could get overwritten by
FW
- Fixes a firmware crash on DCBX APP information request before link up

FOiSCSI:
- Fixes abort task leak in tmf response handling
- Fixes TCP RST handling while in iSCSI ERL0
- Fixes a firmware crash on BYE without INIT

ENHANCEMENTS
-------------

BASE:
- Adds link partner settings reporting when available
- Adds QSA support (in conjunction with QSA VPD)
- Adds T520-BT LED support
- Reports NOTSUPPORTED for modules with an unhandled identifier

DCBX:
- Adds version reporting (indicating which version FW is trying to negotiate)
- Adds IEEE support
- Reports LLDP time outs

FOiSCSI:
- Add support for multiple iSCSI DDP client
- Sends DHCP renew request when lease expires

================================================================================

22.2. T4 Firmware
+++++++++++++++++

Version : 1.14.4.0
Date : 08/05/2015
================================================================================

FIXES
-----

BASE:
- Fixes a potential initialization error when accessing a configuration file
stored on the flash.
- Initialize PCIE_DBG_INDIR_REQ.Enable to 0, as hardware failed to do so and
register dumps could result in errors.

ETH:
- Fixes an issue that sometimes prevented the link from coming up in CR adapters.

ENHANCEMENTS
------------

BASE:
- Adds support for PAUSE OFF watchdog.
- Reports devlog access information in PCIE_FW_PF register 7.

ETH:
- Adds new interface to allow the driver to query the VI rss table base
addresses.

OFLD:
- Adds new interface for the driver to specify offloaded connections TCP snd
and rcv scale factors.

================================================================================
================================================================================

Version : 1.13.32.0
Date : 03/25/2015
================================================================================

FIXES
-----

BASE:
- Fixes FW_CAPS_CONFIG_CMD return value on error (was positive instead of
negative)
- Fixes FW_PARAMS_PARAM_DEV_FLOWC_BUFFIFO_SZ indication (was wrong on certain
adapter configurations)
- Fixes config file based PL_TIMEOUT register programming

ETH:
- Fixes a potential EO UDP SEG header corruption

OFLD:
- Fixes timeout issue with half-open connections
- Fixes FW_FLOWC_WR processing when state is set to finwait1

FOiSCSI:
- Don't create a new tcp socket if ERL0 attempt has timed out.

ENHANCEMENTS
------------

ETH:
- Stops sending LACP frames on loopback interface
- Adds an AUTOEQU indication to CPL_SGE_EGR_UPDATE

OFLD:
- Improves default settings of LAN and CLUSTER TCP timer settings
- Sends Negative Advice CPLs to software

================================================================================
================================================================================

Version : 1.12.25.0
Date : 10/22/2014
================================================================================

FIXES
-----

BASE:
- Improves precision of the Weight Round Robing Traffic Management Algorithm
- Forces link restart when auto-negotiation is disabled
- Fix an issue where pause frames wouldn't be fully disabled even if requested

DCBX:
- Fixes an issue where some settings were not being sent to the switch
correctly
- Fixes an issue where back-to-back DCBX port updates could get overwritten by
FW
- Fixes a firmware crash on DCBX APP information request before link up

FOiSCSI:
- Fixes abort task leak in tmf response handling
- Fixes TCP RST handling while in iSCSI ERL0
- Fixes a firmware crash on BYE without INIT

ENHANCEMENTS
------------

BASE:
- Adds link partner settings reporting when available
- Firmware now reports NOTSUPPORTED for modules with an unhandled identifier

DCBX:
- Adds version reporting (indicating which version FW is trying to negotiate)
- Adds IEEE support
- Reports LLDP time outs

FOiSCSI:
- Adds support for multiple iSCSI DDP clients
- Sends DHCP renew request when lease expires

================================================================================

Obtained from: Chelsio Communications
Sponsored by: Chelsio Communications

MFC r284445 and r286107.

r284445:
cxgbe(4): Add the ability to dump mailbox commands and replies. It is
enabled/disabled via bit 0 of adapter->debug_flags (which is available
at dev.t5nex.<n>.debug_flags).

r286107:
cxgbe(4): initialize debug_flags from the kernel environment.

MFC r259150 (by adrian@) and r283864.

r259150:
Print out the full PCIe link negotiation during dmesg.

I found this useful when checking whether a NIC is in a PCIE 3.0 8x slot
or not.

r283864:
cxgbe: no need to display the per-lane GT/s rating of the pcie link.

MFC r278239 and r278374.

r278239:
cxgbe(4): reserve id for iSCSI upper layer driver.

r278374:
cxgbe(4): tidy up some of the interaction between the Upper Layer
Drivers (ULDs) and the base if_cxgbe driver.

Track the per-adapter activation of ULDs in a new "active_ulds" field.
This was done pretty arbitrarily before this change -- via TOM_INIT_DONE
in adapter->flags for TOM, and the (1 << MAX_NPORTS) bit in
adapter->offload_map for iWARP.

iWARP and hw-accelerated iSCSI rely on the TOE (supported by the TOM
ULD). The rules are:
a) If the iWARP and/or iSCSI ULDs are available when TOE is enabled then
iWARP and/or iSCSI are enabled too.
b) When the iWARP and iSCSI modules are loaded they go looking for
adapters with TOE enabled and enable themselves on that adapter.
c) You cannot deactivate or unload the TOM module from underneath iWARP
or iSCSI. Any such attempt will fail with EBUSY.

MFC r276480, r276485, r276498, r277225, r277226, r277227, r277230,
r277637, and r283149 (by emaste@).

r276485 is the real change here, the rest deal with the fallout of
mp_ring's reliance on 64b atomics.

Use the incorrectly spelled 'eigth' from struct pkthdr in this branch
instead of MFC'ing r261733, which would have renamed the field of a
public structure in a -STABLE branch.
---

r276480:
Temporarily unplug cxgbe(4) from !amd64 builds.

r276485:
cxgbe(4): major tx rework.

a) Front load as much work as possible in if_transmit, before any driver
lock or software queue has to get involved.

b) Replace buf_ring with a brand new mp_ring (multiproducer ring). This
is specifically for the tx multiqueue model where one of the if_transmit
producer threads becomes the consumer and other producers carry on as
usual. mp_ring is implemented as standalone code and it should be
possible to use it in any driver with tx multiqueue. It also has:
- the ability to enqueue/dequeue multiple items. This might become
significant if packet batching is ever implemented.
- an abdication mechanism to allow a thread to give up writing tx
descriptors and have another if_transmit thread take over. A thread
that's writing tx descriptors can end up doing so for an unbounded
time period if a) there are other if_transmit threads continuously
feeding the sofware queue, and b) the chip keeps up with whatever the
thread is throwing at it.
- accurate statistics about interesting events even when the stats come
at the expense of additional branches/conditional code.

The NIC txq lock is uncontested on the fast path at this point. I've
left it there for synchronization with the control events (interface
up/down, modload/unload).

c) Add support for "type 1" coalescing work request in the normal NIC tx
path. This work request is optimized for frames with a single item in
the DMA gather list. These are very common when forwarding packets.
Note that netmap tx in cxgbe already uses these "type 1" work requests.

d) Do not request automatic cidx updates every 32 descriptors. Instead,
request updates via bits in individual work requests (still every 32
descriptors approximately). Also, request an automatic final update
when the queue idles after activity. This means NIC tx reclaim is still
performed lazily but it will catch up quickly as soon as the queue
idles. This seems to be the best middle ground and I'll probably do
something similar for netmap tx as well.

e) Implement a faster tx path for WRQs (used by TOE tx and control
queues, _not_ by the normal NIC tx). Allow work requests to be written
directly to the hardware descriptor ring if room is available. I will
convert t4_tom and iw_cxgbe modules to this faster style gradually.

r276498:
cxgbe(4): remove buf_ring specific restriction on the txq size.

r277225:
Make cxgbe(4) buildable with the gcc in base.

r277226:
Allow cxgbe(4) to be built on i386. Driver attach will succeed only on
a subset of i386 systems.

r277227:
Plug cxgbe(4) back into !powerpc && !arm builds, instead of building it
on amd64 only.

r277230:
Build cxgbe(4) on powerpc64 too.

r277637:
Make sure the compiler flag to get cxgbe(4) to compile with gcc is used
only when gcc is being used. This is what r277225 should have been.

Backport some parts of r272200.
- a lock to protect indirect register access
- put code that deals with stats in a separate cxgbe_refresh_stats.

This is a direct commit to stable/10.

MFC r272183:

Make sure the adapter's management queue and the event queue are
available before any uppper layer driver (TOE, iWARP, or iSCSI)
registers with the base cxgbe(4) driver.

MFC r272051:

cxgbe(4): Verify that the addresses in if_multiaddrs really are multicast
addresses. (The chip doesn't really care, it's just that it needs to be
told explicitly if unicast DMACs are checked for "hits" in the hash that
is used after the TCAM entries are all used up).

MFC r275358 r275483 r276982 - Removing M_FLOWID by hps@

r275358:
Start process of removing the use of the deprecated "M_FLOWID" flag
from the FreeBSD network code. The flag is still kept around in the
"sys/mbuf.h" header file, but does no longer have any users. Instead
the "m_pkthdr.rsstype" field in the mbuf structure is now used to
decide the meaning of the "m_pkthdr.flowid" field. To modify the
"m_pkthdr.rsstype" field please use the existing "M_HASHTYPE_XXX"
macros as defined in the "sys/mbuf.h" header file.

This patch introduces new behaviour in the transmit direction.
Previously network drivers checked if "M_FLOWID" was set in "m_flags"
before using the "m_pkthdr.flowid" field. This check has now now been
replaced by checking if "M_HASHTYPE_GET(m)" is different from
"M_HASHTYPE_NONE". In the future more hashtypes will be added, for
example hashtypes for hardware dedicated flows.

"M_HASHTYPE_OPAQUE" indicates that the "m_pkthdr.flowid" value is
valid and has no particular type. This change removes the need for an
"if" statement in TCP transmit code checking for the presence of a
valid flowid value. The "if" statement mentioned above is now a direct
variable assignment which is then later checked by the respective
network drivers like before.

r275483:
Remove M_FLOWID from SCTP code.

r276982:
Remove no longer used "M_FLOWID" flag from mbuf.h and update the netisr
manpage.

Note: The FreeBSD version has been bumped.

Reviewed by: hps, tuexen
Sponsored by: Limelight Networks

MFC r278485:

cxgbe(4): allow the SET_FILTER_MODE ioctl to change the mode when it's
safe to do so.

MFC r280403:

cxgbe(4): Do not call sbuf_trim on an sbuf with a drain function.

MFC r279969:

cxgbe(4): fix if_media handling for T520-BT cards. 1Gbps and 100Mbps
are valid for this card.

MFC r278372:

cxgbe(4): adapter_full_init is always a synchronized operation.

MFC r278371:

cxgbe(4): a change to the synchronization rules within the the driver.
This is purely cosmetic because the new rules are already followed.

MFC r278342:

cxgbe(4): fix a test made while enabling TOE.

MFC r276597:

cxgbe/tom: do not engage the TOE's payload chopper for payload < 2 MSS
or for 10Gbps ports.

MFC r276728:

cxgbe(4): fix the description of a strange bunch of counters.

MFC r274456:

Fix some bad interaction between cxgbe(4) and lacp lagg(4) that could
leave a port permanently disabled when a copper cable is unplugged and
then plugged right back in.

lacp_linkstate goes looking for the current ifmedia on a link state
change and it could get stale information from cxgbe(4) on a module
unplug followed by replug. The fix is to process module events before
link-state events within the driver, and to always rebuild the ifmedia
list on a module change event (instead of rebuilding it lazily).

Thanks to asomers@ for the problem report and detailed analysis to go
with it.

MFC 274402:
Add device ID for the T502-BT (dual-port 1G) adapter.

MFC r274724:
cxgbe(4): figure out the max payload size and save it for later.

MFC r272190:

cxgbe(4): explicitly set various if_hw_tso* values.

MFC r263710, r273377, r273378, r273423 and r273455:

- De-vnet hash sizes and hash masks.
- Fix multiple issues related to arguments passed to SYSCTL macros.

Sponsored by: Mellanox Technologies

MFC r271450:
cxgbe(4): knobs to enable/disable PAUSE frame based flow control.

Approved by: re (glebius)

MFC r266571, r266757, r268536, r269076, r269364, r269366, r269411,
r269413, r269428, r269440, r269537, r269644, r269731, and the cxgbe
portion of r270063.

r266571:
cxgbe(4): Remove stray if_up from the code that creates the tracing ifnet.

r266757:
cxgbe(4): netmap support for Terminator 5 (T5) based 10G/40G cards.
Netmap gets its own hardware-assisted virtual interface and won't take
over or disrupt the "normal" interface in any way. You can use both
simultaneously.

For kernels with DEV_NETMAP, cxgbe(4) carves out an ncxl<N> interface
(note the 'n' prefix) in the hardware to accompany each cxl<N>
interface. These two ifnet's per port share the same wire but really
are separate interfaces in the hardware and software. Each gets its own
L2 MAC addresses (unicast and multicast), MTU, checksum caps, etc. You
should run netmap on the 'n' interfaces only, that's what they are for.

With this, pkt-gen is able to transmit > 45Mpps out of a single 40G port
of a T580 card. 2 port tx is at ~56Mpps total (28M + 28M) as of now.
Single port receive is at 33Mpps but this is very much a work in
progress. I expect it to be closer to 40Mpps once done. In any case
the current effort can already saturate multiple 10G ports of a T5 card
at the smallest legal packet size. T4 gear is totally untested.

trantor:~# ./pkt-gen -i ncxl0 -f tx -D 00:07:43:ab:cd:ef
881.952141 main [1621] interface is ncxl0
881.952250 extract_ip_range [275] range is 10.0.0.1:0 to 10.0.0.1:0
881.952253 extract_ip_range [275] range is 10.1.0.1:0 to 10.1.0.1:0
881.962540 main [1804] mapped 334980KB at 0x801dff000
Sending on netmap:ncxl0: 4 queues, 1 threads and 1 cpus.
10.0.0.1 -> 10.1.0.1 (00:00:00:00:00:00 -> 00:07:43:ab:cd:ef)
881.962562 main [1882] Sending 512 packets every 0.000000000 s
881.962563 main [1884] Wait 2 secs for phy reset
884.088516 main [1886] Ready...
884.088535 nm_open [457] overriding ifname ncxl0 ringid 0x0 flags 0x1
884.088607 sender_body [996] start
884.093246 sender_body [1064] drop copy
885.090435 main_thread [1418] 45206353 pps (45289533 pkts in 1001840 usec)
886.091600 main_thread [1418] 45322792 pps (45375593 pkts in 1001165 usec)
887.092435 main_thread [1418] 45313992 pps (45351784 pkts in 1000834 usec)
888.094434 main_thread [1418] 45315765 pps (45406397 pkts in 1002000 usec)
889.095434 main_thread [1418] 45333218 pps (45378551 pkts in 1001000 usec)
890.097434 main_thread [1418] 45315247 pps (45405877 pkts in 1002000 usec)
891.099434 main_thread [1418] 45326515 pps (45417168 pkts in 1002000 usec)
892.101434 main_thread [1418] 45333039 pps (45423705 pkts in 1002000 usec)
893.103434 main_thread [1418] 45324105 pps (45414708 pkts in 1001999 usec)
894.105434 main_thread [1418] 45318042 pps (45408723 pkts in 1002001 usec)
895.106434 main_thread [1418] 45332430 pps (45377762 pkts in 1001000 usec)
896.107434 main_thread [1418] 45338072 pps (45383410 pkts in 1001000 usec)
...

r268536:
cxgbe(4): Add an iSCSI softc to the adapter structure.

r269076:
Some hooks in cxgbe(4) for the offloaded iSCSI driver.

r269364:
Improve compliance with style.Makefile(5).

r269366:
List one file per line in the Makefiles. This makes it easier to read
diffs when a file is added or removed.

r269411:
cxgbe(4): minor optimizations in ingress queue processing.

Reorganize struct sge_iq. Make the iq entry size a compile time
constant. While here, eliminate RX_FL_ESIZE and use EQ_ESIZE directly.

r269413:
cxgbe(4): Fix an off by one error when looking for the BAR2 doorbell
address of an egress queue.

r269428:
cxgbe(4): some optimizations in freelist handling.

r269440:
cxgbe(4): Remove an unused version of t4_enable_vi.

r269537:
cxgbe(4): Do not run any sleepable code in the SIOCSIFFLAGS handler when
IFF_PROMISC or IFF_ALLMULTI is being flipped. bpf(4) holds its global
mutex around ifpromisc in at least the bpf_dtor path.

r269644:
cxgbe(4): Let caller specify whether it's ok to sleep in
t4_sched_config and t4_sched_params.

r269731:
cxgbe(4): Do not poke T4-only registers on a T5 (and vice versa).

Relnotes: Yes (native netmap support for Chelsio T4/T5 cards)

MFC r268971 and r269032.

r268971:
Simplify r267600, there's no need to distinguish between allocated and
inlined mbufs.

r269032:
cxgbe(4): Keep track of the clusters that have to be freed by the
custom free routine (rxb_free) in the driver. Fail MOD_UNLOAD with
EBUSY if any such cluster has been handed up to the kernel but hasn't
been freed yet. This prevents a panic later when the cluster finally
needs to be freed but rxb_free is gone from the kernel.

MFC r268640 and r268989.

r268640:
Allow multi-byte reads in the private CHELSIO_T4_GET_I2C ioctl. The
firmware allows up to 48B to be read this way but the driver limits
itself to 8B at a time to remain compatible with old cxgbetool
binaries.

r268989:
Add missing newline to an error message.

MFC r268706:
cxgbe(4): Display CF facility correctly in the device log.

MFC r259382:

Read card capabilities after firmware initialization, instead of setting
them up as part of firmware initialization (which the driver gets to do
only if it's the master driver).

Read the range of tids available for the ETHOFLD functionality if it's
enabled.

New is_ftid() and is_etid() functions to test whether a tid falls within
the range of filter tids or ETHOFLD tids respectively.

MFC r263317, r263412, and r263451.

r263317:
cxgbe(4): significant rx rework.

- More flexible cluster size selection, including the ability to fall
back to a safe cluster size (PAGE_SIZE from zone_jumbop by default) in
case an allocation of a larger size fails.
- A single get_fl_payload() function that assembles the payload into an
mbuf chain for any kind of freelist. This replaces two variants: one
for freelists with buffer packing enabled and another for those without.
- Buffer packing with any sized cluster. It was limited to 4K clusters
only before this change.
- Enable buffer packing for TOE rx queues as well.
- Statistics and tunables to go with all these changes. The driver's
man page will be updated separately.

r263412:
cxgbe(4): if_iqdrops statistic should include tunnel congestion drops.

r263451:
cxgbe(4): man page updates.

MFC r260210 (by adrian@):
Add an option to enable or disable the small RX packet copying that
is done to improve performance of small frames.

When doing RX packing, the RX copying isn't necessarily required.

MFC r261533, r261536, r261537, and r263457.

r261533:
cxgbe(4): Use the port's tx channel to identify it to t4_clr_port_stats.

r261536:
cxgbe(4): The T5 allows for a different freelist starvation threshold
for queues with buffer packing. Use the correct value to calculate a
freelist's low water mark.

r261537:
cxgbe(4): Use the rx channel map (instead of the tx channel map) as the
congestion channel map.

r263457:
cxgbe(4): Recognize the "spider" configuration where a T5 card's 40G
QSFP port is presented as 4 distinct 10G SFP+ ports to the driver.

MFC r264621

use correct (integer) type for the temperature sysctl

Reviewed by: np, scottl
Obtained from: Netflix

MFC r261558

Add a new sysctl, dev.cxgbe.N.rsrv_noflow, and a companion tunable,
hw.cxgbe.rsrv_noflow. When set, queue 0 of the port is reserved for
TX packets without a flowid. The hash value of packets with a flowid
is bumped up by 1. The intent is to provide a private queue for
link-level packets like LACP that is unlikely to overflow or suffer
deep queue latency.

MFC r259145:
Unstaticize t4_list and t4_uld_list. This works around a clang
annoyance[1] and allows kgdb to find these symbols.

[1] http://lists.freebsd.org/pipermail/freebsd-hackers/2012-November/041166.html

MFC r257654, r257772, r258441, r258689, r258698, r258879, r259048, and
r259103.

r257654:
cxgbe(4): Exclude MPS_RPLC_MAP_CTL (0x11114) from the register dump. Turns
out it's a write-only register with strange side effects on read.

r257772:
cxgbe(4): Tidy up the display for payload memory statistics (pm_stats).

r258441:
cxgbe(4): update the internal list of device features.

r258689:
Disable an assertion that relies on some code[1] that isn't in HEAD yet.

r258698:
cxgbetool: "modinfo" command to display SFP+ module information.

r258879:
cxgbe(4): T4_SET_SCHED_CLASS and T4_SET_SCHED_QUEUE ioctls to program
scheduling classes in the chip and to bind tx queue(s) to a scheduling
class respectively. These can be used for various kinds of tx traffic
throttling (to force selected tx queues to drain at a fixed Kbps rate,
or a % of the port's total bandwidth, or at a fixed pps rate, etc.).

r259048:
Two new cxgbetool subcommands to set up scheduler classes and to bind
them to NIC queues.

r259103:
cxgbe(4): save a copy of the RSS map for each port for the driver's use.

MFC r256459.

cxgbe(4): Update T4 and T5 firmwares to 1.9.12.0

Approved by: re (glebius)