On 10/23/23 17:47, Bob Pearson wrote:
Edward,
There is a test which may be new since this failure didn't happen
before. Modify srq tries to set max_wr to 4094 but the rxe driver
rounds this up to 2^n-1 or 4095. My understanding of the IBA
spec is that queue sizes can be set larger than requested.
Also this same test tries to change max_sge using the same
MAX_WR mask bit. There is no mention (as far as I can recall)
in the IBA spec of being able to change the max_sge setting.
Is this really the correct behavior?
Bob Pearson
Just for reference
11.2.3.3 MODIFY SHARED RECEIVE QUEUE
Description:
Modifies the attributes of an SRQ for the specified HCA.
If any of the modify attributes are invalid, none of the attributes
shall be modified.
Input Modifiers:
•HCA handle.
•SRQ handle.
•The SRQ attributes to modify and their new values. The SRQ at-
tributes that can be modified after the SRQ has been created are:
•The maximum number of outstanding Work Requests the
Consumer expects to submit to the Shared Receive Queue, if
resizing of the SRQ is supported by the HCA.
[It does *not* include max_sge.]
•SRQ Limit. If the SRQ Limit is greater than zero, then it shall
be armed upon returning from this verb.
Output Modifiers:
•The actual number of outstanding Work Requests supported on
the Shared Receive Queue. If an error is not returned, this is
guaranteed to be greater than or equal to the number requested.
(This may require the Consumer to increase the size of the CQ.)
[Unfortunately the rdma verbs API does not support returning the
new value of max_wr. You have to call ib_query_srq to get the new
value which does *not* have to equal the requested size.]
•Verb Results:
•Operation completed successfully.
•Insufficient resources to complete request.
•Invalid HCA handle.
•Invalid SRQ handle.
•SRQ is in the Error State.
•HCA does not support resizing SRQ.
•Maximum number of Work Requests requested exceeds HCA
capability.
•SRQ Limit exceeds maximum number of Work Requests al-
lowed on the SRQ.
•More outstanding entries on WQ than size specified.
•HCA does not support SRQ.
[The test_modify_srq just seems incorrect.]
