serial: Support Frame Check Sequence

According to DSP0253, implementing frame check sequence via
crc-16-ccitt calculation. crc-16-ccitt implementation refer
to RFC1662 Appendix C.

Tested:
Verified

serial: Support Frame Check Sequence

According to DSP0253, implementing frame check sequence via
crc-16-ccitt calculation. crc-16-ccitt implementation refer
to RFC1662 Appendix C.

Tested:
Verified on sending/receiving mctp packets with mctp-serial
kernel driver.

Change-Id: I8417d521589e9f40a0ca68596cdcfd061fd919cc
Signed-off-by: John Chung <john.chung@arm.com>

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tests: serial: Format with clang-format

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Id67222b31bf66d2df3d55b417b3a9f22666249f6

serial: Give write callbacks a consistent behaviour

Require that the write callbacks return either the number of bytes
written or a negative error code. From there, ensure the return value
behaviour

serial: Give write callbacks a consistent behaviour

Require that the write callbacks return either the number of bytes
written or a negative error code. From there, ensure the return value
behaviour is the same for the fd and custom handler paths.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Id9b90cf4e5c5815dc6385c3d493e2bbbd8e47616

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core: Add TX/RX API that exposes message tag and tag owner

MCTP received packets can carry a message tag and tag owner bit
which is set by a remote MCTP endpoint. This can be used by the
remote MCTP

core: Add TX/RX API that exposes message tag and tag owner

MCTP received packets can carry a message tag and tag owner bit
which is set by a remote MCTP endpoint. This can be used by the
remote MCTP endpoint to track the responses. Thus, libmctp should
provide a mechanism for the upper layer MCTP applications to
respond with the same message tag.

This patchset extends TX and RX API with message tag and
tag owner bits.

Signed-off-by: Sumanth Bhat <sumanth.bhat@linux.intel.com>
Change-Id: I6d07eafa86c653abdd4313ab7cc77e5a93124477

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libmctp: Introduce compiler.h

Define __unused here and include compiler.h in all the places we can
make use of it. Clean up some header ordering and include styles while
we're at it.

Signed-off-by:

libmctp: Introduce compiler.h

Define __unused here and include compiler.h in all the places we can
make use of it. Clean up some header ordering and include styles while
we're at it.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I33ddbdacbddbbf557dc02e42d8dde71a16e1cabe

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bootstrap: Ratchet up compiler strictness

Replace the specific warning flags with -Wall -Wextra and turn on
-Werror.

Covered by -Wall:

* -Wformat
* -Warray-bounds
* -Wimplicit-function-declaration

bootstrap: Ratchet up compiler strictness

Replace the specific warning flags with -Wall -Wextra and turn on
-Werror.

Covered by -Wall:

* -Wformat
* -Warray-bounds
* -Wimplicit-function-declaration

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Iab21e67026d2453648aa6ebe4c299e1162fc5ebf

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test_serial: Clean up after test case

Free all allocated memory to avoid false-positives from leak sanitizers.
Resolves:

==15807==ERROR: LeakSanitizer: detected memory leaks

Indirect leak

test_serial: Clean up after test case

Free all allocated memory to avoid false-positives from leak sanitizers.
Resolves:

==15807==ERROR: LeakSanitizer: detected memory leaks

Indirect leak of 4096 byte(s) in 1 object(s) allocated from:
#0 0x7fb35b934f1e in __interceptor_realloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x10df1e)
#1 0x7fb35b7f3065 in __mctp_realloc /home/andrew/src/openbmc/libmctp/alloc.c:48
#2 0x7fb35b7ed979 in mctp_msg_ctx_add_pkt /home/andrew/src/openbmc/libmctp/core.c:213
#3 0x7fb35b7f0a09 in mctp_bus_rx /home/andrew/src/openbmc/libmctp/core.c:383
#4 0x7fb35b7f467d in mctp_serial_finish_packet /home/andrew/src/openbmc/libmctp/serial.c:169
#5 0x7fb35b7f6071 in mctp_rx_consume_one /home/andrew/src/openbmc/libmctp/serial.c:254
#6 0x7fb35b7f6409 in mctp_rx_consume /home/andrew/src/openbmc/libmctp/serial.c:271
#7 0x7fb35b7f668a in mctp_serial_read /home/andrew/src/openbmc/libmctp/serial.c:288
#8 0x559680986cc7 in main tests/test_serial.c:113
#9 0x7fb35ac9e1e2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x271e2)

Indirect leak of 1384 byte(s) in 1 object(s) allocated from:
#0 0x7fb35b934ae8 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x10dae8)
#1 0x7fb35b7f2cf0 in __mctp_alloc /home/andrew/src/openbmc/libmctp/alloc.c:28
#2 0x7fb35b7f6cad in mctp_serial_init /home/andrew/src/openbmc/libmctp/serial.c:343
#3 0x559680986553 in main tests/test_serial.c:99
#4 0x7fb35ac9e1e2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x271e2)

Indirect leak of 552 byte(s) in 1 object(s) allocated from:
#0 0x7fb35b934ae8 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x10dae8)
#1 0x7fb35b7f2cf0 in __mctp_alloc /home/andrew/src/openbmc/libmctp/alloc.c:28
#2 0x7fb35b7ededc in mctp_init /home/andrew/src/openbmc/libmctp/core.c:234
#3 0x559680986485 in main tests/test_serial.c:96
#4 0x7fb35ac9e1e2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x271e2)

Indirect leak of 40 byte(s) in 1 object(s) allocated from:
#0 0x7fb35b934ae8 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x10dae8)
#1 0x7fb35b7f2cf0 in __mctp_alloc /home/andrew/src/openbmc/libmctp/alloc.c:28
#2 0x7fb35b7ee55f in mctp_register_bus /home/andrew/src/openbmc/libmctp/core.c:277
#3 0x559680986b64 in main tests/test_serial.c:105
#4 0x7fb35ac9e1e2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x271e2)

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I9f95104545cc6f633ee134fffc90cb0ea2c46eeb

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test_serial: Resolve control reaching end of non-void function

mctp-binding_serial_pipe_tx() was missing a return:

tests/test_serial.c: In function ‘mctp_binding_serial_pipe_tx’:
tests/test

test_serial: Resolve control reaching end of non-void function

mctp-binding_serial_pipe_tx() was missing a return:

tests/test_serial.c: In function ‘mctp_binding_serial_pipe_tx’:
tests/test_serial.c:34:1: error: control reaches end of non-void function [-Werror=return-type]
34 | }
| ^
cc1: all warnings being treated as errors

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Ia15a13fe4e283b76bfb4a856ea188a46ac5cf12c

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cmake: Add new tests to test suite

Bring functionality of the cmake build system up to autotools.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I2231b51cfd52460fb525b5af6893b0474508859b

test_serial: Fix assert triggered in core.c

$ ./tests/test_serial
test_serial: core.c:252: mctp_register_bus: Assertion `mctp->n_busses == 0' failed.
Aborted (core dumped)

I'm not sure

test_serial: Fix assert triggered in core.c

$ ./tests/test_serial
test_serial: core.c:252: mctp_register_bus: Assertion `mctp->n_busses == 0' failed.
Aborted (core dumped)

I'm not sure how this slipped through the cracks, and CI didn't catch it
either. However, the scenario wasn't correctly modelled, so do the proper
thing and instantiate two mctp contexts and assign a binding instance to each,
connected by the pipes.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Ib5382a45cd0042c840fdb01b2038e9a531bf2384

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tests: Add test_serial

Uses pipes to connect two instances (A and B) of the serial binding and
passes a message exceeding the BTU from A to B.

Increases test converage for libmctp as a whole from ~

tests: Add test_serial

Uses pipes to connect two instances (A and B) of the serial binding and
passes a message exceeding the BTU from A to B.

Increases test converage for libmctp as a whole from ~60% (lines and
functions) to ~75% (lines and functions).

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Iaad6f265528799148c23db9365ebf9fa748e50ee

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