Add missing lock upon initialization of the interface

Lack of this lock was causing crash if down was called in
parallel with the initialization routine.

Submitted by: Michal Krawczyk <mk@semihal

Add missing lock upon initialization of the interface

Lack of this lock was causing crash if down was called in
parallel with the initialization routine.

Submitted by: Michal Krawczyk <mk@semihalf.com>
Obtained from: Semihalf
Sponsored by: Amazon.com Inc.

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Merge ^/head r319165 through r319250.

Introduce additional locks when releasing TX resources and buffers in ENA

There could be race condition with TX cleaning routine when cleaning mbufs,
when it was called directly from main sending th

Introduce additional locks when releasing TX resources and buffers in ENA

There could be race condition with TX cleaning routine when cleaning mbufs,
when it was called directly from main sending thread (ena_mq_start).

Submitted by: Michal Krawczyk <mk@semihalf.com>
Obtained from: Semihalf
Sponsored by: Amazon.com Inc.
Differential revision: https://reviews.freebsd.org/D10927

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Move ENA's hw stats updating routine to separate task

Initially, stats were being updated each time OS was requesting for
the first statistic.
To read statistics from hw, condvar was used. cv_timedw

Move ENA's hw stats updating routine to separate task

Initially, stats were being updated each time OS was requesting for
the first statistic.
To read statistics from hw, condvar was used. cv_timedwait cannot be
called when unsleepable lock is held, and this happens when FreeBSD
is requesting statistic.
Seperate task is reading statistics from NIC each 1 second.

Submitted by: Michal Krawczyk <mk@semihalf.com>
Obtained from: Semihalf
Sponsored by: Amazon.com Inc.
Differential revision: https://reviews.freebsd.org/D10926

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Add error handling to the ENA driver if init of the reset task fails

Also, to simplify cleaning routine, reset task is initialized before
allocating statistics and other resources.

Submitted by:

Add error handling to the ENA driver if init of the reset task fails

Also, to simplify cleaning routine, reset task is initialized before
allocating statistics and other resources.

Submitted by: Michal Krawczyk <mk@semihalf.com>
Obtained from: Semihalf
Sponsored by: Amazon.com Inc.
Differential revision: https://reviews.freebsd.org/D10925

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Add locks before each ena_up and ena_down

Lock only ena_up and ena_down calls in ioctl handler, instead of whole
ioctl. Locking ioctl with sx lock that is sleepable, is not allowed in
some cases, e.

Add locks before each ena_up and ena_down

Lock only ena_up and ena_down calls in ioctl handler, instead of whole
ioctl. Locking ioctl with sx lock that is sleepable, is not allowed in
some cases, e.g. when multicast options are being changed.
Additional locking was added in deatch function to prevent race condition
with ioctl function.

Submitted by: Michal Krawczyk <mk@semihalf.com>
Obtained from: Semihalf
Sponsored by: Amazon.com Inc.
Differential revision: https://reviews.freebsd.org/D10924

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Add mbuf defragmentation to the ENA driver

When mbuf chain is too long and device cannot handle that number
of segments in DMA transaction, mbuf chain will be defragmented.
Initially, driver was dro

Add mbuf defragmentation to the ENA driver

When mbuf chain is too long and device cannot handle that number
of segments in DMA transaction, mbuf chain will be defragmented.
Initially, driver was dropping all mbuf chains that were exceeding
supported number of segments.

Submitted by: Michal Krawczyk <mk@semihalf.com>
Obtained from: Semihalf
Sponsored by: Amazon.com Inc.
Differential revision: https://reviews.freebsd.org/D10923

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Merge ^/head r318560 through r318657.

Add support for Amazon Elastic Network Adapter (ENA) NIC

ENA is a networking interface designed to make good use of modern CPU
features and system architectures.

The ENA device exposes a lightweigh

Add support for Amazon Elastic Network Adapter (ENA) NIC

ENA is a networking interface designed to make good use of modern CPU
features and system architectures.

The ENA device exposes a lightweight management interface with a
minimal set of memory mapped registers and extendable command set
through an Admin Queue.

The driver supports a range of ENA devices, is link-speed independent
(i.e., the same driver is used for 10GbE, 25GbE, 40GbE, etc.), and has
a negotiated and extendable feature set.

Some ENA devices support SR-IOV. This driver is used for both the
SR-IOV Physical Function (PF) and Virtual Function (VF) devices.

ENA devices enable high speed and low overhead network traffic
processing by providing multiple Tx/Rx queue pairs (the maximum number
is advertised by the device via the Admin Queue), a dedicated MSI-X
interrupt vector per Tx/Rx queue pair, and CPU cacheline optimized
data placement.

The ENA driver supports industry standard TCP/IP offload features such
as checksum offload and TCP transmit segmentation offload (TSO).
Receive-side scaling (RSS) is supported for multi-core scaling.

The ENA driver and its corresponding devices implement health
monitoring mechanisms such as watchdog, enabling the device and driver
to recover in a manner transparent to the application, as well as
debug logs.

Some of the ENA devices support a working mode called Low-latency
Queue (LLQ), which saves several more microseconds. This feature will
be implemented for driver in future releases.

Submitted by: Michal Krawczyk <mk@semihalf.com>
Jakub Palider <jpa@semihalf.com>
Jan Medala <jan@semihalf.com>
Obtained from: Semihalf
Sponsored by: Amazon.com Inc.
Differential revision: https://reviews.freebsd.org/D10427

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