[ewg] RE: rdma retry number

[Sean Hefty]

>During failover test, we found the iscsi over iser reconnected to the
>iscs target after 100 seconds due to the default max timeout (8sec) and
>retry number (15). The max timeout was adjustable with the module
>parameter, max_timeout, of ib_cm.ko, but the retry number wasn't. Can we
>add the retry number as module parameter of rdma_cm.ko? I added the
>patch below based on the ofed version, OFED-1.2-20070626-0917.

Note that you can abort a connection operation by destroying the corresponding
rdma_cm_id.

Does iser try to re-establish a connection over the same path on failover?  I'm
wondering why it tried to connect over the failed path first.

>+static int cma_max_cm_retries = CMA_MAX_CM_RETRIES;
>+module_param_named(cma_max_cm_retries, cma_max_cm_retries, int, 0644);
>+MODULE_PARM_DESC(cma_max_cm_retries, "the number of retry");

This must be a value between 0-15.

I need to see if there's a better way to support users that want smaller
connection timeouts.
 
- Sean