On 26/06/2013 18:17, Or Gerlitz wrote:
Based on the bits set in the comp mask and the in_words field value,
the kernel which has cmdX_v2 can work towards older user space
libraries/applications e.g cmdX_v1 and cmdX_v0
The comp mask is not part of the header, but rather the 1st field of
every uverbs command and response, here, in this series, it was added
in patch 3/4 for the uverbs flow-steering structures which are cmdX_v0
in this context.
The comp mask biz logic is also explained in Tzahi's OFA 2013 talk on
verbs extensions, he is referring their to extending libibverbs API in
user space towards applications but the concept is the same, slides here
https://www.openfabrics.org/resources/document-downloads/presentations/doc_download/549-extending-verbs-api.html
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