Jack Morgenstein wrote:
On Thursday 21 February 2008 13:42, Or Gerlitz wrote:
As far as I understand under Sinai you must issue an adjust_key call
when the key is about to wraparound, correct?
Actually, its not related to wraparound. The key adjustment is in the
mpt-index section only, and does not affect the sequence number section.
If we don't re-initialize the key, adjust_key should not be called.
Is it possible to never re-initialize the key? if yes, what's the
semantics of the M=max_map_per_fmr device attribute? I was thinking that
after the fmr was mapped M times, something --has-- to be reinitialized,
sorry if this is my misunderstanding, can you clarify that?
Or
commit d4cb0784fd1ea99ef3d20526811bd5608146fe60
Author: Or Gerlitz <[EMAIL PROTECTED]>
Date: Sat Jun 17 20:37:37 2006 -0700
IB/mthca: Fill in max_map_per_fmr device attribute
Report the true max_map_per_fmr value from mthca_query_device(),
taking into account the change in FMR remapping introduced by the
Sinai performance optimization.
Signed-off-by: Or Gerlitz <[EMAIL PROTECTED]>
Signed-off-by: Roland Dreier <[EMAIL PROTECTED]>
diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c
b/drivers/infiniband/hw/mthca/mthca_provider.c
index a2eae8a..8f89ba7 100644
--- a/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -115,6 +115,16 @@ static int mthca_query_device(struct ib_device *ibdev,
props->max_mcast_qp_attach = MTHCA_QP_PER_MGM;
props->max_total_mcast_qp_attach = props->max_mcast_qp_attach *
props->max_mcast_grp;
+ /*
+ * If Sinai memory key optimization is being used, then only
+ * the 8-bit key portion will change. For other HCAs, the
+ * unused index bits will also be used for FMR remapping.
+ */
+ if (mdev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
+ props->max_map_per_fmr = 255;
+ else
+ props->max_map_per_fmr =
+ (1 << (32 - long_log2(mdev->limits.num_mpts))) - 1;
err = 0;
out:
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