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

These firmwares were obtained from the beta "Chelsio T5/T4 Unified Wire
v2.12.0.2 for Linux" release. Changes since last release are listed in the
"Release Notes" accompanying the beta release and are copy-pasted here as well.

The plan is to have only GA'd firmwares in any -STABLE FreeBSD branch so I'll
MFC this (after 2 months) only if it ends up in a GA release.

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

Version : 1.15.28.0

Date : 02/29/2016

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.

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.

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 : 1.15.28.0

Date : 02/29/2016

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.

ENHANCEMENTS

BASE:

• Added MPS raw interface.

ETH:

• New mailbox command FW_DCB_IEEE_CMD api added for IEEE dcbx.

Obtained from: Chelsio Communications
MFC after: 2 months
Sponsored by: Chelsio Communications