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| author | Jack Morgenstein <jackm@mellanox.co.il> | 2005-12-09 16:38:04 -0800 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2005-12-09 16:38:04 -0800 |
| commit | 6aa2e4e8063114bd7cea8616dd5848d3c64b4c36 (patch) | |
| tree | 0daa26d085f163572df0292913e8f0b4818c1558 /drivers/infiniband | |
| parent | 94361cf74a6fca1973d2fed5338d5fb4bcd902fa (diff) | |
| download | talos-obmc-linux-6aa2e4e8063114bd7cea8616dd5848d3c64b4c36.tar.gz talos-obmc-linux-6aa2e4e8063114bd7cea8616dd5848d3c64b4c36.zip | |
IB/mthca: correct log2 calculation
Fix thinko in rd_atomic calculation: ffs(x) - 1 does not find the next
power of 2 -- it should be fls(x - 1).
Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il>
Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/hw/mthca/mthca_qp.c | 17 |
1 files changed, 6 insertions, 11 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_qp.c b/drivers/infiniband/hw/mthca/mthca_qp.c index c5c3d0edbbf5..84056a8b794e 100644 --- a/drivers/infiniband/hw/mthca/mthca_qp.c +++ b/drivers/infiniband/hw/mthca/mthca_qp.c @@ -728,9 +728,9 @@ int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask) } if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) { - qp_context->params1 |= cpu_to_be32(min(attr->max_rd_atomic ? - ffs(attr->max_rd_atomic) - 1 : 0, - 7) << 21); + if (attr->max_rd_atomic) + qp_context->params1 |= + cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21); qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_SRA_MAX); } @@ -769,8 +769,6 @@ int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask) } if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) { - u8 rra_max; - if (qp->resp_depth && !attr->max_dest_rd_atomic) { /* * Lowering our responder resources to zero. @@ -798,13 +796,10 @@ int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask) MTHCA_QP_OPTPAR_RAE); } - for (rra_max = 0; - 1 << rra_max < attr->max_dest_rd_atomic && - rra_max < dev->qp_table.rdb_shift; - ++rra_max) - ; /* nothing */ + if (attr->max_dest_rd_atomic) + qp_context->params2 |= + cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21); - qp_context->params2 |= cpu_to_be32(rra_max << 21); qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RRA_MAX); qp->resp_depth = attr->max_dest_rd_atomic; |
