Re: [PATCH V6 1/9] RDMA/iser: Limit sg tablesize and max_sectors to device fastreg max depth

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On Fri, Jul 24, 2015 at 11:18:21AM -0500, Steve Wise wrote:
> Currently the sg tablesize, which dictates fast register page list
> depth to use, does not take into account the limits of the rdma device.
> So adjust it once we discover the device fastreg max depth limit.  Also
> adjust the max_sectors based on the resulting sg tablesize.

Huh. How does this relate to the max_page_list_len argument:

 struct ib_mr *ib_alloc_fast_reg_mr(struct ib_pd *pd, int max_page_list_len)

Shouldn't max_fast_reg_page_list_len be checked during the above?

Ie does this still make sense:

drivers/infiniband/ulp/iser/iser_verbs.c:       desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE + 1);

?

The only ULP that checks this is SRP, so basically, all our ULPs are
probably quietly broken? cxgb3 has a limit of 10 (!?!?!!)

Jason
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