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Commit 48fd0d1f authored by Michael S. Tsirkin's avatar Michael S. Tsirkin Committed by Roland Dreier
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IB/mthca: Safer max_send_sge/max_recv_sge calculation 



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: default avatarMichael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent cbc5b2bb

drivers/infiniband/hw/mthca/mthca_qp.c

+6 −4
Original line number Diff line number Diff line
@@ -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) -

	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);

			       sizeof (struct mthca_data_seg));

}



/*