[DTrace-devel] [PATCH v5 0/6] DTrace TCP provider

[Alan Maguire]

looks like this crossed with the merging of v4 + cg changes, please
ignore. Thanks!

On 22/07/2025 11:07, Alan Maguire wrote:
> This series adds TCP provider support, where the probes are
> implemented via underlying fbt and sdt probes.
> 
> Due to the use of the sock/inet_sock_set_state tracepoint, intended
> for ~5.15 kernels and later.  Tried replacing this with
> 
> fbt::tcp_set_state:entry
> 
> but this misses a few state transitions, so stuck with using
> the tracepoint.
> 
> All tests under test/unittest/tcp pass unmodified on an upstream
> (6.15) kernel and 5.15 UEK7U3 kernel.  The updated remote address
> retrieval patch helps ensure tests can all be run.
> 
> It implements all documented TCP provider probes:
> 
> accept-established, accept-refused, connnect-request,
> connect-established, connect-refused, receive, send,
> state-change
> 
> Note that to function correctly this series depends on the
> cg-related patches:
> 
> parser: add dt_node_is_tstring()
> cg: validate tstring alloc/free
> cg: optimize ternary expressions for strings
> tstring: fix leaks
> 
> Changes since v4:
> 
> - updated patch 1 to rename dt_cg_get_member() to
>   dt_cg_tramp_get_member() and have it make use of
>   dt_cg_ctf_offsetof() (Kris, patch 1)
> - remove tslot update patch since it is handled elsewhere
>   (Kris)
> - added R-Bs from Kris
> 
> Changes since v3:
> 
> - fix patch 2 to really use/describe 6 tstring slots (patch 2)
> 
> Changes since v2:
> 
> - document tslots change properly, add test (Eugene, patch 2, 3)
> - move more generic type definitions to net.d
> - retain depends_on provider tcp in tcp.d (Kris, patch 5)
> - use depends_on library ip.d to ensure loading order (patch 5)
> - revert tcp flags to uint8_t (Kris, patch 5)
> - improve comments in tcp.d (Kris, Eugene, patch 5)
> - fix up handling of ip:::send for older kernels to avoid null
>   dereferences (Eugene, patch 5)
> - fix up provider arguments to match spec (Eugene, patch 5)
> 
> Changes since RFC:
> 
> - fixed issues with test failures on UEK7 due to missing
>   SYN_RCV state change
> - moved get_member() to dt_cg.c (patch 1)
> 
> Alan Maguire (6):
>   cg: refactor get_member() to use dt_cg_ctf_offsetof
>   test/operators: extend ternary tests to cover inet_ntoa*()s
>   providers: move network-generic definitions to net.d
>   tcp: new provider
>   dlibs: sync ip.d, net.d and tcp.d
>   unittest/tcp: update test.x
> 
>  dlibs/aarch64/5.11/ip.d               |  27 +-
>  dlibs/aarch64/5.11/net.d              |  31 +-
>  dlibs/aarch64/5.11/tcp.d              |  67 +++--
>  dlibs/aarch64/5.12/ip.d               |  27 +-
>  dlibs/aarch64/5.12/net.d              |  31 +-
>  dlibs/aarch64/5.12/tcp.d              |  67 +++--
>  dlibs/aarch64/5.14/ip.d               |  27 +-
>  dlibs/aarch64/5.14/net.d              |  31 +-
>  dlibs/aarch64/5.14/tcp.d              |  67 +++--
>  dlibs/aarch64/5.16/ip.d               |  27 +-
>  dlibs/aarch64/5.16/net.d              |  31 +-
>  dlibs/aarch64/5.16/tcp.d              |  67 +++--
>  dlibs/aarch64/5.2/ip.d                |  27 +-
>  dlibs/aarch64/5.2/net.d               |  31 +-
>  dlibs/aarch64/5.2/tcp.d               |  67 +++--
>  dlibs/aarch64/5.6/ip.d                |  27 +-
>  dlibs/aarch64/5.6/net.d               |  31 +-
>  dlibs/aarch64/5.6/tcp.d               |  67 +++--
>  dlibs/aarch64/6.1/ip.d                |  27 +-
>  dlibs/aarch64/6.1/net.d               |  31 +-
>  dlibs/aarch64/6.1/tcp.d               |  67 +++--
>  dlibs/aarch64/6.10/ip.d               |  27 +-
>  dlibs/aarch64/6.10/net.d              |  31 +-
>  dlibs/aarch64/6.10/tcp.d              |  67 +++--
>  dlibs/x86_64/5.11/ip.d                |  27 +-
>  dlibs/x86_64/5.11/net.d               |  31 +-
>  dlibs/x86_64/5.11/tcp.d               |  67 +++--
>  dlibs/x86_64/5.12/ip.d                |  27 +-
>  dlibs/x86_64/5.12/net.d               |  31 +-
>  dlibs/x86_64/5.12/tcp.d               |  67 +++--
>  dlibs/x86_64/5.14/ip.d                |  27 +-
>  dlibs/x86_64/5.14/net.d               |  31 +-
>  dlibs/x86_64/5.14/tcp.d               |  67 +++--
>  dlibs/x86_64/5.16/ip.d                |  27 +-
>  dlibs/x86_64/5.16/net.d               |  31 +-
>  dlibs/x86_64/5.16/tcp.d               |  67 +++--
>  dlibs/x86_64/5.2/ip.d                 |  27 +-
>  dlibs/x86_64/5.2/net.d                |  31 +-
>  dlibs/x86_64/5.2/tcp.d                |  67 +++--
>  dlibs/x86_64/5.6/ip.d                 |  27 +-
>  dlibs/x86_64/5.6/net.d                |  31 +-
>  dlibs/x86_64/5.6/tcp.d                |  67 +++--
>  dlibs/x86_64/6.1/ip.d                 |  27 +-
>  dlibs/x86_64/6.1/net.d                |  31 +-
>  dlibs/x86_64/6.1/tcp.d                |  67 +++--
>  dlibs/x86_64/6.10/ip.d                |  27 +-
>  dlibs/x86_64/6.10/net.d               |  31 +-
>  dlibs/x86_64/6.10/tcp.d               |  67 +++--
>  libdtrace/Build                       |   2 +
>  libdtrace/dt_cg.c                     |  57 +++-
>  libdtrace/dt_cg.h                     |   4 +-
>  libdtrace/dt_prov_io.c                |  84 +++---
>  libdtrace/dt_prov_ip.c                |  45 +--
>  libdtrace/dt_prov_proc.c              |   4 +-
>  libdtrace/dt_prov_sched.c             |   2 +-
>  libdtrace/dt_prov_tcp.c               | 413 ++++++++++++++++++++++++++
>  libdtrace/dt_prov_uprobe.c            |   4 +-
>  libdtrace/dt_provider.c               |   1 +
>  libdtrace/dt_provider.h               |   1 +
>  libdtrace/ip.d                        |  27 +-
>  libdtrace/net.d                       |  31 +-
>  libdtrace/tcp.d                       |  67 +++--
>  test/unittest/operators/tst.ternary.d |  20 +-
>  test/unittest/operators/tst.ternary.r |   2 +
>  test/unittest/tcp/test.x              |   8 +-
>  65 files changed, 1731 insertions(+), 1041 deletions(-)
>  create mode 100644 libdtrace/dt_prov_tcp.c
>