On Sun, Aug 23, 2026 at 07:36:39PM +0530, Raghavendra Ningoji wrote: > Document AMD EPYC Embedded NTB support in the raw/ntb guide, add a > release note entry, and claim maintainership of the AMD NTB support. > > Signed-off-by: Raghavendra Ningoji <[email protected]> > --- > MAINTAINERS | 1 + > doc/guides/rawdevs/ntb.rst | 18 +++++++++++++++++- > doc/guides/rel_notes/release_26_11.rst | 8 ++++++++ > 3 files changed, 26 insertions(+), 1 deletion(-) >
This documentation should be squashed into the prevous patch adding the support. See also one additional comment below. Thanks, /Bruce > diff --git a/MAINTAINERS b/MAINTAINERS > index e99a65d197..13306345fd 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -1613,6 +1613,7 @@ F: doc/guides/rawdevs/cnxk_rvu_lf.rst > > NTB > M: Jingjing Wu <[email protected]> > +M: Bhagyada Modali <[email protected]> > F: drivers/raw/ntb/ > F: doc/guides/rawdevs/ntb.rst > F: examples/ntb/ > diff --git a/doc/guides/rawdevs/ntb.rst b/doc/guides/rawdevs/ntb.rst > index 3721b4880e..c89eaccac8 100644 > --- a/doc/guides/rawdevs/ntb.rst > +++ b/doc/guides/rawdevs/ntb.rst > @@ -37,10 +37,26 @@ then reboot. > - Set ``PCIe PLL SSC (Spread Spectrum Clocking)`` as ``Disabled``, on both > hosts. > This is a hardware requirement when using Re-timer Cards. > > +AMD EPYC Embedded NTB > +--------------------- > + > +The driver also supports the NTB endpoints integrated in AMD EPYC Embedded > +"Turin", "Genoa" and "Siena" processors. These use a primary/secondary > +topology rather than the Intel back-to-back topology: one endpoint is > +enumerated as the primary (device ID ``0x14c0``) and the other as the > +secondary (device ID ``0x14c3``). The BIOS on both systems performs NTB link > +training; no additional NTB-specific BIOS options are required beyond > enabling > +the NTB endpoints. > + > +The AMD NTB hardware exposes two memory windows (BAR23 and BAR45), 16 > +doorbells and a single shared 16-register scratchpad bank. The scratchpad > +bank is split into two disjoint 8-register sets, one owned by each side, so > +the driver uses a packed handshake layout that fits within 8 registers. > + The documentation needs an update on the alignment requirements and handling - either the need for the new alignment API if one is added as I suggested, or else details on how the app needs to handle it itself (which is less preferable). > Device Setup > ------------ > > -The Intel NTB devices need to be bound to a DPDK-supported kernel driver > +The NTB devices need to be bound to a DPDK-supported kernel driver > to use, i.e. igb_uio, vfio. The ``dpdk-devbind.py`` script can be used to > show devices status and to bind them to a suitable kernel driver. They will > appear under the category of "Misc (rawdev) devices". > diff --git a/doc/guides/rel_notes/release_26_11.rst > b/doc/guides/rel_notes/release_26_11.rst > index c8cc86295d..0b364ccbd4 100644 > --- a/doc/guides/rel_notes/release_26_11.rst > +++ b/doc/guides/rel_notes/release_26_11.rst > @@ -55,6 +55,14 @@ New Features > Also, make sure to start the actual text at the margin. > ======================================================= > > +* **Added AMD NTB support to the NTB rawdev driver.** > + > + Added support for the NTB endpoints integrated in AMD EPYC Embedded > + "Turin", "Genoa" and "Siena" processors to the ``raw/ntb`` driver. > + The NTB rawdev framework was generalized to support multiple vendors, > + with AMD-specific hardware access, a primary/secondary topology and a > + packed scratchpad handshake. > + > > Removed Items > ------------- > -- > 2.34.1 >
