[Feature] Support for F-Tile HE-HSSI 200G/400G

[anandhv]

Description

This change adds a new 'command' to the 'hssi' utility (which was originally built using the afu-test framework) to support the 200G/400G HE-HSSI AFU (host exerciser high speed serial interface accelerator functional unit). 'HSSI' is synonymous with 'Ethernet'. The HE-HSSI AFU is only useful when compiled with a FIM that contains the HSSI-SubSystem (HSSI-SS) (i.e. the actual Ethernet interface).

The 200G/400G HE-HSSI AFU differs from the 10G/100G HE-HSSI AFUs in that it contains a new traffic generator IP (TG) to drive the 200G/400G HSSI-SS in the FIM. A new TG is needed to support MAC-segmented signaling on the HSSI-SS, which is required for the faster speeds.

Like other 'commands', the utility looks for the specific AFU-ID of the 200G/400G HE-HSSI AFU and will otherwise error out.

The TG simply reads packet data from a ROM, therefore that data is fixed at compile time. The ROM end-address is different for 200G vs 400G. There is a read-only register in the AFU that is read to discern which speed the given AFU supports.

The ROM contains 32 x 1482-byte packets. The TG has a CSR to specify how many times the ROM shall be read (called the 'ROM loop count') and we use this to control the total number of packets transmitted.

The only argument is --num-packets.

The utility displays the measured throughput and other useful information.

It assumes the 200G AFU variant contains two Ethernet ports, and the 400G variant contains one Ethernet port.

Collateral (docs, reports, design examples, case IDs):

• Document Update Required? Yes
• The 'hssi' utility readme has been updated. PR is here.

Tests added:

Tests run:

• Manually tested against 200G/400G FIM+HE-HSSI on F-Series Dev Kit.

[coveralls]

Pull Request Test Coverage Report for Build 6789624540

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 68.161%

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Totals
Change from base Build 6774453596:	0.0%
Covered Lines:	15754
Relevant Lines:	23113

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