Add port FEC histogram counter support.

[mikeberesford]

Signed-off-by: Mike Beresford mberes@google.com

[kcudnik]

please fix errors

WARNING: star should be next to param name saiswitch.h:2783:     * SAI_PORT_STAT_IF_IN_FEC_CODEWORD_ERRORS_HISTOGRAM_S* attributes.
Running Aspell
Words to check: 3002
WARNING: Word 'codeword' is misspelled saiport.h 2761:     * @brief Port FEC codeword symbol error counters.
WARNING: Word 'codewords' is misspelled saiport.h 2774:    /** Count of FEC codewords with 1 symbol error. */
WARNING: Word 'retreived' is misspelled saiport.h 2769:     * of errors that can be detected may be retreived via the

[mikeberesford]

Meta checker errors fixed

[rlhui]

@prgeor , please help review? thx.

[mikeberesford]

@JaiOCP please review as well

[lguohan]

can we have code example how these attributes are used?

[mikeberesford]

@lguohan is there anything in particular you'd like to see? The SAI_PORT_STAT_IF_IN_FEC_CODEWORD_ERRORS_HISTOGRAM_* are accessed in the same way as all the rest of the port counters. SAI_PORT_ATTR_MAX_FEC_ERRORS_DETECTABLE could be used to determine the number of counters to collect if desired.

[rlhui]

@lguohan is there anything in particular you'd like to see? The SAI_PORT_STAT_IF_IN_FEC_CODEWORD_ERRORS_HISTOGRAM_* are accessed in the same way as all the rest of the port counters. SAI_PORT_ATTR_MAX_FEC_ERRORS_DETECTABLE could be used to determine the number of counters to collect if desired.

example code of how a NOS should read and interpret it.