Don't forget to release the adapter lock for a no-op.

Fix for a cxgb(4) panic. cxgb_ioctl can be called by the IP and IPv6
layers with non-sleepable locks held. Don't (potentially) sleep in
those situations.

Merge from head at r201628.

# This hasn't been tested, and there are at least three bad commits
# that need to be backed out before the branch will be stable again.

Don't disable the XGMAC's tx on ifconfig down. It is unnecessary
and can cause false backpressure in the chip. Fix a us/ms mixup
while here.

sc->rev and is_offload(sc) will always be 0 during probe. Wait till
attach to get correct values.

MFC @199204

Take a step towards removing if_watchdog/if_timer. Don't explicitly set
if_watchdog/if_timer to NULL/0 when initializing an ifnet. if_alloc()
sets those members to NULL/0 already.

cxgb(4) updates, including:
- support for the new Gen-2, BT, and LP-CR cards.
- T3 firmware 7.7.0
- shared "common code" updates.

Approved by: gnn (mentor)
Obtained from: Chelsio
MFC after: 1 month

- MFC from head@196987

Fill the reverse RSS map with 0xff's so that the subsequent loop to
calculate the values will work properly.

Reviewed by: np
MFC after: 1 month

- MFC

Various ifmedia related fixes in cxgb(4), including:

- build ifmedia list based on phy->caps, not string comparisons.
- rebuild media list when a transceiver change is detected.
- return EOPNOTSUPP

Various ifmedia related fixes in cxgb(4), including:

- build ifmedia list based on phy->caps, not string comparisons.
- rebuild media list when a transceiver change is detected.
- return EOPNOTSUPP instead of ENXIO in cxgb_media_status.

Approved by: gnn (mentor)
MFC after: 2 weeks.

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Fix cxgb's ifmedia ioctl handling. Also fixed a comment.

Reviewed by: kmacy
Approved by: gnn (mentor)

Greatly simplify cxgb by removing almost all of the custom mbuf management logic

- remove mbuf iovec - useful, but adds too much complexity when isolated to
the driver

- remove driver private ca

Greatly simplify cxgb by removing almost all of the custom mbuf management logic

- remove mbuf iovec - useful, but adds too much complexity when isolated to
the driver

- remove driver private caching - insufficient benefit over UMA to justify
the added complexity and maintenance overhead

- remove separate logic for managing multiple transmit queues, with the
new drbr routines the control flow can be made to much more closely resemble
legacy drivers

- remove dedicated service threads, with per-cpu callouts one can get the same
benefit much more simply by registering a callout 1 tick in the future if there
are still buffered packets

- remove embedded mbuf usage - Jeffr's changes will (I hope) soon be integrated
greatly reducing the overhead of using kernel APIs for reference counting
clusters

- add hysteresis to descriptor coalescing logic

- add coalesce threshold sysctls to allow users to decide at run-time
between optimizing for forwarding / UDP or optimizing for TCP

- add once per second watchdog to effectively close the very rare races
occurring from coalescing

- incorporate Navdeep's changes to the initialization path required to
convert port and adapter locks back to ordinary mutexes (silencing BPF
LOR complaints)

- enable prefetches in get_packet and tx cleaning

Reviewed by: navdeep@
MFC after: 2 weeks

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- Merge from HEAD

Re-add the send queue tunable for people who do not use buffering.

Reviewed by: jhb
MFC after: 3 days

Rework interrupt bringup and teardown.

Calculate the exact number of vectors we'll use before calling
pci_alloc_msix. Don't grab nine all the time.

Call cxgb_setup_interrupts once per T3, not once

Rework interrupt bringup and teardown.

Calculate the exact number of vectors we'll use before calling
pci_alloc_msix. Don't grab nine all the time.

Call cxgb_setup_interrupts once per T3, not once per port. Ditto
for cxgb_teardown_interrupts.

Don't leak resources when interrupt setup fails in the middle.

Obtained from: Navdeep Parhar
MFC after: 10 days

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Merge from HEAD

Partial reversion of previous commit. The CXGB_SHUTDOWN flag does NOT
need to be inverted when doing an ifconfig down of an interface.

Pointed out by: Navdeep Parhar
MFC after: 1 week

Fix a possible panic cxgb_controller_attach() routine that would occur
only if prepping the adapter failed.

Slight adjustment to comments.

Fix a bug whereby downing the interface didn't preven it f

Fix a possible panic cxgb_controller_attach() routine that would occur
only if prepping the adapter failed.

Slight adjustment to comments.

Fix a bug whereby downing the interface didn't preven it from
processing packets.

Submitted by: Navdeep Parhar
MFC after: 1 week

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Integrate three changes from Chelsio.

1) Add a sysctl that will say what type of PHYs exist on the card.
2) Fix a bug that occurs when an AEL 2005 PHY resets without a transciever
in the card.
3) Un

Integrate three changes from Chelsio.

1) Add a sysctl that will say what type of PHYs exist on the card.
2) Fix a bug that occurs when an AEL 2005 PHY resets without a transciever
in the card.
3) Unify the PHY link detection code.

Obtained from: Navdeep Parhar
MFC after: 10 days

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Modified the attach and detach routines to handle bringing ports up
and down more cleanly. This addresses a problem where if we have the
link flap during boot the driver would lock up the system.

R

Modified the attach and detach routines to handle bringing ports up
and down more cleanly. This addresses a problem where if we have the
link flap during boot the driver would lock up the system.

Reviewed by: jhb
MFC after: 1 week

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We no longer need to use d_thread_t, migrate to struct thread *.

- Merge from HEAD

Minor updates to the Chelsio driver, including removing an LOR.

Submitted by: Navdeep Parhar at Chelsio
Reviewed by: gnn
MFC after: 3 weeks