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doc/af_xdp: include unaligned chunk case 

The addition of unaligned chunks mode, the documentation needs to be
updated to indicate that the incoming addr to the fill ring will only be
masked if the user application is run in the aligned chunk mode. This patch
also adds a line to explicitly indicate that the incoming addr will not be
masked if running the user application in the unaligned chunk mode.

Signed-off-by: Kevin Laatz <kevin.laatz@intel.com>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Kevin Laatz 2019-08-27 02:25:31 +00:00 committed by Daniel Borkmann
parent 3945b37a97
commit d57f172c99
1 changed files with 6 additions and 4 deletions
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10
Documentation/networking/af_xdp.rst
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@ -153,10 +153,12 @@ an example, if the UMEM is 64k and each chunk is 4k, then the UMEM has
Frames passed to the kernel are used for the ingress path (RX rings).
The user application produces UMEM addrs to this ring. Note that the
kernel will mask the incoming addr. E.g. for a chunk size of 2k, the
log2(2048) LSB of the addr will be masked off, meaning that 2048, 2050
and 3000 refers to the same chunk.
The user application produces UMEM addrs to this ring. Note that, if
running the application with aligned chunk mode, the kernel will mask
the incoming addr. E.g. for a chunk size of 2k, the log2(2048) LSB of
the addr will be masked off, meaning that 2048, 2050 and 3000 refers
to the same chunk. If the user application is run in the unaligned
chunks mode, then the incoming addr will be left untouched.
UMEM Completion Ring