cxgbe(4): Create two variants of service_iq, one for queues with
freelists and one for those without.

MFH: 3 weeks
Sponsored by: Chelsio Communications

cxgbe(4): Add a sysctl to control the tx credit reclaim mechanism for
netmap tx queues. There is no change in default behavior.

Sponsored by: Chelsio Communications

cxgbe(4): Add a hw.cxgbe.starve_fl sysctl that can be used to starve the
freelists of netmap receive queues. This is primarily to test various
congestion scenarios in the chip.

Sponsored by: Chelsi

cxgbe(4): Add a hw.cxgbe.starve_fl sysctl that can be used to starve the
freelists of netmap receive queues. This is primarily to test various
congestion scenarios in the chip.

Sponsored by: Chelsio Communications

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cxgbe(4): Track the number of received frames separately from the number
of descriptors processed. Add the ability to gather a certain maximum
number of frames in the driver's rx before waking up ne

cxgbe(4): Track the number of received frames separately from the number
of descriptors processed. Add the ability to gather a certain maximum
number of frames in the driver's rx before waking up netmap rx. If
there aren't enough frames then netmap rx will be woken up as usual.

hw.cxgbe.nm_rx_nframes

Sponsored by: Chelsio Communications

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netmap: align codebase to the current upstream (commit id 3fb001303718146)

Changelist:
- Turn tx_rings and rx_rings arrays into arrays of pointers to kring
structs. This patch includes fix

netmap: align codebase to the current upstream (commit id 3fb001303718146)

Changelist:
- Turn tx_rings and rx_rings arrays into arrays of pointers to kring
structs. This patch includes fixes for ixv, ixl, ix, re, cxgbe, iflib,
vtnet and ptnet drivers to cope with the change.
- Generalize the nm_config() callback to accept a struct containing many
parameters.
- Introduce NKR_FAKERING to support buffers sharing (used for netmap
pipes)
- Improved API for external VALE modules.
- Various bug fixes and improvements to the netmap memory allocator,
including support for externally (userspace) allocated memory.
- Refactoring of netmap pipes: now linked rings share the same netmap
buffers, with a separate set of kring pointers (rhead, rcur, rtail).
Buffer swapping does not need to happen anymore.
- Large refactoring of the control API towards an extensible solution;
the goal is to allow the addition of more commands and extension of
existing ones (with new options) without the need of hacks or the
risk of running out of configuration space.
A new NIOCCTRL ioctl has been added to handle all the requests of the
new control API, which cover all the functionalities so far supported.
The netmap API bumps from 11 to 12 with this patch. Full backward
compatibility is provided for the old control command (NIOCREGIF), by
means of a new netmap_legacy module. Many parts of the old netmap.h
header has now been moved to netmap_legacy.h (included by netmap.h).

Approved by: hrs (mentor)

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Catch up with the removal of nktr_slot_flags from upstream netmap. No
functional impact intended.

Submitted by: Vincenzo Maffione <v.maffione@gmail.com>

cxgbe(4): Do not forward interrupts to queues with freelists. This
leaves the firmware event queue (fwq) as the only queue that can take
interrupts for others.

This simplifies cfg_itype_and_nqueues

cxgbe(4): Do not forward interrupts to queues with freelists. This
leaves the firmware event queue (fwq) as the only queue that can take
interrupts for others.

This simplifies cfg_itype_and_nqueues and queue allocation in the driver
at the cost of a little (never?) used configuration. It also allows
service_iq to be split into two specialized variants in the future.

MFC after: 2 months
Sponsored by: Chelsio Communications

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cxgbe(4): Fix per-queue netmap operation.

Do not attempt to initialize netmap queues that are already initialized
or aren't supposed to be initialized. Similarly, do not free queues
that are not i

cxgbe(4): Fix per-queue netmap operation.

Do not attempt to initialize netmap queues that are already initialized
or aren't supposed to be initialized. Similarly, do not free queues
that are not initialized or aren't supposed to be freed.

PR: 217156
Sponsored by: Chelsio Communications

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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 after: 1 week

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.

Sponsored by: Chelsio Communications

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

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

Sponsored by: Chelsio Communications

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 bet

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.

Reviewed by: np
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D7389

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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 affecte

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.
---------------------

Approved by: re@ (gjb@)
Relnotes: Yes
Sponsored by: Chelsio Communications

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sys: Make use of our rounddown() macro when sys/param.h is available.

No functional change.

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 g

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.

Sponsored by: Chelsio Communications

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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

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.

Obtained from: Chelsio Communications
Sponsored by: Chelsio Communications

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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) w

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.

Reviewed by: np
MFC after: 1 month
Sponsored by: Chelsio

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Sync netmap sources with the version in our private tree.
This commit contains large contributions from Giuseppe Lettieri and
Stefano Garzarella, is partly supported by grants from Verisign and Cisco

Sync netmap sources with the version in our private tree.
This commit contains large contributions from Giuseppe Lettieri and
Stefano Garzarella, is partly supported by grants from Verisign and Cisco,
and brings in the following:

- fix zerocopy monitor ports and introduce copying monitor ports
(the latter are lower performance but give access to all traffic
in parallel with the application)

- exclusive open mode, useful to implement solutions that recover
from crashes of the main netmap client (suggested by Patrick Kelsey)

- revised memory allocator in preparation for the 'passthrough mode'
(ptnetmap) recently presented at bsdcan. ptnetmap is described in
S. Garzarella, G. Lettieri, L. Rizzo;
Virtual device passthrough for high speed VM networking,
ACM/IEEE ANCS 2015, Oakland (CA) May 2015
http://info.iet.unipi.it/~luigi/research.html

- fix rx CRC handing on ixl

- add module dependencies for netmap when building drivers as modules

- minor simplifications to device-specific routines (*txsync, *rxsync)

- general code cleanup (remove unused variables, introduce macros
to access rings and remove duplicate code,

Applications do not need to be recompiled, unless of course
they want to use the new features (monitors and exclusive open).

Those willing to try this code on stable/10 can just update the
sys/dev/netmap/*, sys/net/netmap* with the version in HEAD
and apply the small patches to individual device drivers.

MFC after: 1 month
Sponsored by: (partly) Verisign, Cisco

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cxgbe(4): Add a new knob that controls the congestion response of netmap
rx queues. The default is to drop rather than backpressure.

This decouples the congestion settings of NIC and netmap rx queu

cxgbe(4): Add a new knob that controls the congestion response of netmap
rx queues. The default is to drop rather than backpressure.

This decouples the congestion settings of NIC and netmap rx queues.

MFC after: 3 days

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cxgbe(4): request an automatic tx update when a netmap tx queue idles.
The NIC tx queues already do this.

MFC after: 1 week
Differential Revision:

cxgbe: set the minimum burst size when fetching fl buffers to 128B for
netmap rx queues too. This should have gone in as part of r283858.

cxgbe(4): experimental rx packet sink for netmap queues. This is not
intended for general use.

MFC after: 1 month

cxgbe(4): knobs to experiment with the interrupt coalescing timer for
netmap rx queues, and the "batchiness" of rx updates sent to the chip.

These knobs will probably become per-rxq in the near futu

cxgbe(4): knobs to experiment with the interrupt coalescing timer for
netmap rx queues, and the "batchiness" of rx updates sent to the chip.

These knobs will probably become per-rxq in the near future and will be
documented only after their final form is decided.

MFC after: 1 month

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cxgbe(4): provide the correct size of freelists associated with netmap
rx queues to the chip. This will fix many problems with native netmap
rx on ncxl/ncxgbe interfaces.

MFC after: 1 week