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IB/mthca: Safer max_send_sge/max_recv_sge calculation

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Calculation of QP capabilities still isn't exactly right in mthca:
max_send_sge/max_recv_sge fields returned in create_qp can exceed the
handware supported limits.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Michael S. Tsirkin 2005-11-18 14:11:17 -08:00 committed by Roland Dreier
parent cbc5b2bb9e
commit 48fd0d1fdd
1 changed files with 6 additions and 4 deletions
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10
drivers/infiniband/hw/mthca/mthca_qp.c
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@ -918,10 +918,12 @@ static void mthca_adjust_qp_caps(struct mthca_dev *dev,
else
qp->max_inline_data = max_data_size - MTHCA_INLINE_HEADER_SIZE;
qp->sq.max_gs = max_data_size / sizeof (struct mthca_data_seg);
qp->rq.max_gs = (min(dev->limits.max_desc_sz, 1 << qp->rq.wqe_shift) -
sizeof (struct mthca_next_seg)) /
sizeof (struct mthca_data_seg);
qp->sq.max_gs = min_t(int, dev->limits.max_sg,
max_data_size / sizeof (struct mthca_data_seg));
qp->rq.max_gs = min_t(int, dev->limits.max_sg,
(min(dev->limits.max_desc_sz, 1 << qp->rq.wqe_shift) -
sizeof (struct mthca_next_seg)) /
sizeof (struct mthca_data_seg));
}
/*