OK, here's a modified version of the patch to support both mem full/free HCAs,
in the memfree case the code relies on this quote from the (section 4.2 pp 45)
memfree PRM:
"A memory key is composed of two fields, a 24-bit index and an 8-bit key.
The key field is an arbitrarily chosen number. The index field is unique
number used as an index to an MPT table entry, ..."
Or.
implement max_map_per_fmr device attribute for mthca
Signed-off-by: Or Gerlitz <[EMAIL PROTECTED]>
Index: hw/mthca/mthca_provider.c
===================================================================
--- hw/mthca/mthca_provider.c (revision 7031)
+++ hw/mthca/mthca_provider.c (working copy)
@@ -116,6 +116,15 @@ static int mthca_query_device(struct ib_
props->max_total_mcast_qp_attach = props->max_mcast_qp_attach *
props->max_mcast_grp;
+ /* on memfull HCA an FMR can be remapped 2^B - 1 times where B < 32 is
+ * the number of bits which are not used for MPT addressing, on memfree
+ * HCA B=8 so an FMR can be remapped 255 times.
+ */
+ if(!mthca_is_memfree(mdev))
+ props->max_map_per_fmr = (1 << (32 -
+ long_log2(mdev->limits.num_mpts))) - 1;
+ else
+ props->max_map_per_fmr = (1 << 8) - 1;
err = 0;
out:
kfree(in_mad);
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