From a3d8e1591dc90d359d444c759dfda2c6fc605251 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Fri, 16 May 2008 14:28:30 -0700 Subject: IB/mlx4: Fix uninitialized-var warning in mlx4_ib_post_send() drivers/infiniband/hw/mlx4/qp.c: In function 'mlx4_ib_post_send': drivers/infiniband/hw/mlx4/qp.c:1460: warning: 'seglen' may be used uninitialized in this function This is the dopey gcc-doesn't-know-that-foo(&var)-writes-to-var problem. Signed-off-by: Andrew Morton Signed-off-by: Roland Dreier --- drivers/infiniband/hw/mlx4/qp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/infiniband/hw/mlx4/qp.c') diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c index 8e02ecfec188..cec030e118d1 100644 --- a/drivers/infiniband/hw/mlx4/qp.c +++ b/drivers/infiniband/hw/mlx4/qp.c @@ -1457,7 +1457,7 @@ int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr, unsigned ind; int uninitialized_var(stamp); int uninitialized_var(size); - unsigned seglen; + unsigned uninitialized_var(seglen); int i; spin_lock_irqsave(&qp->sq.lock, flags); -- cgit v1.2.3 From cd155c1c7c9e64df6afb5504d292fef7cb783a4f Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Tue, 20 May 2008 14:00:02 -0700 Subject: IB/mlx4: Fix creation of kernel QP with max number of send s/g entries When creating a kernel QP where the consumer asked for a send queue with lots of scatter/gater entries, set_kernel_sq_size() incorrectly returned an error if the send queue stride is larger than the hardware's maximum send work request descriptor size. This is not a problem; the only issue is to make sure that the actual descriptors used do not overflow the maximum descriptor size, so check this instead. Clamp the returned max_send_sge value to be no bigger than what query_device returns for the max_sge to avoid confusing hapless users, even if the hardware is capable of handling a few more s/g entries. This bug caused NFS/RDMA mounts to fail when the server adapter used the mlx4 driver. Signed-off-by: Roland Dreier --- drivers/infiniband/hw/mlx4/qp.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) (limited to 'drivers/infiniband/hw/mlx4/qp.c') diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c index cec030e118d1..a80df22deae8 100644 --- a/drivers/infiniband/hw/mlx4/qp.c +++ b/drivers/infiniband/hw/mlx4/qp.c @@ -333,6 +333,9 @@ static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap, cap->max_inline_data + sizeof (struct mlx4_wqe_inline_seg)) + send_wqe_overhead(type, qp->flags); + if (s > dev->dev->caps.max_sq_desc_sz) + return -EINVAL; + /* * Hermon supports shrinking WQEs, such that a single work * request can include multiple units of 1 << wqe_shift. This @@ -372,9 +375,6 @@ static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap, qp->sq.wqe_shift = ilog2(roundup_pow_of_two(s)); for (;;) { - if (1 << qp->sq.wqe_shift > dev->dev->caps.max_sq_desc_sz) - return -EINVAL; - qp->sq_max_wqes_per_wr = DIV_ROUND_UP(s, 1U << qp->sq.wqe_shift); /* @@ -395,7 +395,8 @@ static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap, ++qp->sq.wqe_shift; } - qp->sq.max_gs = ((qp->sq_max_wqes_per_wr << qp->sq.wqe_shift) - + qp->sq.max_gs = (min(dev->dev->caps.max_sq_desc_sz, + (qp->sq_max_wqes_per_wr << qp->sq.wqe_shift)) - send_wqe_overhead(type, qp->flags)) / sizeof (struct mlx4_wqe_data_seg); @@ -411,7 +412,9 @@ static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap, cap->max_send_wr = qp->sq.max_post = (qp->sq.wqe_cnt - qp->sq_spare_wqes) / qp->sq_max_wqes_per_wr; - cap->max_send_sge = qp->sq.max_gs; + cap->max_send_sge = min(qp->sq.max_gs, + min(dev->dev->caps.max_sq_sg, + dev->dev->caps.max_rq_sg)); /* We don't support inline sends for kernel QPs (yet) */ cap->max_inline_data = 0; -- cgit v1.2.3