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author | Vladimir Sokolovsky <vlad@mellanox.co.il> | 2008-07-14 23:48:53 -0700 |
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committer | Roland Dreier <rolandd@cisco.com> | 2008-07-14 23:48:53 -0700 |
commit | 2d92865158d0e21ef4350703af64bc2a610d81d3 (patch) | |
tree | 8b11b29982ccff35bc6810e5a57c568ce1a4ada0 /drivers/infiniband | |
parent | de910bd92137005b5e1ecaf2ce68053d7d7d5350 (diff) |
mlx4_core: Use MOD_STAT_CFG command to get minimal page size
There was a bug in some versions of the mlx4 driver in
mlx4_alloc_fmr(), which hardcoded the minimum acceptable page_shift to
be 12. However, new ConnectX firmware can support a minimum
page_shift of 9 (log_pg_sz of 9 returned by QUERY_DEV_LIM) -- so with
old drivers, ib_fmr_alloc() would fail for ULPs using the device
minimum when creating FMRs.
To preserve firmware compatibility with released mlx4 drivers, the
firmware will continue to return 12 as before for log_page_sz in
QUERY_DEV_CAP for these drivers. However, to enable new drivers to
take advantage of the available smaller page size, the mlx4 driver now
first sets the log_pg_sz to the device minimum by setting a
log_page_sz value to 0 via the MOD_STAT_CFG command and then reading
the real minimum via QUERY_DEV_CAP.
Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il>
Signed-off-by: Vladimir Sokolovsky <vlad@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband')
0 files changed, 0 insertions, 0 deletions