From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vu Pham Subject: [PATCH v1 06/10] mlx4: Enable create and attach cq to the vector with least number of cqs already attached Date: Mon, 16 Aug 2010 15:16:39 -0700 Message-ID: <4C69B8C7.3020007@mellanox.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="------------000200090704090601000104" Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: ewg-bounces-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org Errors-To: ewg-bounces-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org To: Roland Dreier Cc: Linux RDMA , OpenFabrics EWG , Oren Duer List-Id: linux-rdma@vger.kernel.org This is a multi-part message in MIME format. --------------000200090704090601000104 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit --------------000200090704090601000104 Content-Type: text/x-patch; name="0006-mlx4-Enable-create-and-attach-cq-to-the-vector.patch" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename*0="0006-mlx4-Enable-create-and-attach-cq-to-the-vector.patch" >>From 2d10665af8bfa41f772bedc18592b76b96c06729 Mon Sep 17 00:00:00 2001 From: Vu Pham Date: Tue, 10 Aug 2010 14:33:51 -0700 Subject: [PATCH 06/10] mlx4: Enable create and attach cq to the vector with least number of cqs already attached When the vector number passed to mlx4_cq_alloc is MLX4_LEAST_ATTACHED_VECTOR the driver selects the completion vector that has the least CQs attached and attaches the CQ to the chosen vector. IB_CQ_VECTOR_LEAST_ATTACHED is defined in rdma/ib_verbs.h, when mlx4_ib driver recieves this cq vector number, it uses MLX4_LEAST_ATTACHED_VECTOR to create the cq Signed-off-by: Yevgeny Petrilin Signed-off-by: Vu Pham --- drivers/infiniband/hw/mlx4/cq.c | 4 +++- drivers/net/mlx4/cq.c | 27 +++++++++++++++++++++++---- drivers/net/mlx4/en_cq.c | 2 +- drivers/net/mlx4/mlx4.h | 1 + include/linux/mlx4/device.h | 2 ++ include/rdma/ib_verbs.h | 10 +++++++++- 6 files changed, 39 insertions(+), 7 deletions(-) diff --git a/drivers/infiniband/hw/mlx4/cq.c b/drivers/infiniband/hw/mlx4/cq.c index 5a219a2..2687970 100644 --- a/drivers/infiniband/hw/mlx4/cq.c +++ b/drivers/infiniband/hw/mlx4/cq.c @@ -223,7 +223,9 @@ struct ib_cq *mlx4_ib_create_cq(struct ib_device *ibdev, int entries, int vector } err = mlx4_cq_alloc(dev->dev, entries, &cq->buf.mtt, uar, - cq->db.dma, &cq->mcq, vector, 0); + cq->db.dma, &cq->mcq, + vector == IB_CQ_VECTOR_LEAST_ATTACHED ? + MLX4_LEAST_ATTACHED_VECTOR : vector, 0); if (err) goto err_dbmap; diff --git a/drivers/net/mlx4/cq.c b/drivers/net/mlx4/cq.c index 7cd34e9..a6f03f9 100644 --- a/drivers/net/mlx4/cq.c +++ b/drivers/net/mlx4/cq.c @@ -187,6 +187,22 @@ int mlx4_cq_resize(struct mlx4_dev *dev, struct mlx4_cq *cq, } EXPORT_SYMBOL_GPL(mlx4_cq_resize); +static int mlx4_find_least_loaded_vector(struct mlx4_priv *priv) +{ + int i; + int index = 0; + int min = priv->eq_table.eq[0].load; + + for (i = 1; i < priv->dev.caps.num_comp_vectors; i++) { + if (priv->eq_table.eq[i].load < min) { + index = i; + min = priv->eq_table.eq[i].load; + } + } + + return index; +} + int mlx4_cq_alloc(struct mlx4_dev *dev, int nent, struct mlx4_mtt *mtt, struct mlx4_uar *uar, u64 db_rec, struct mlx4_cq *cq, unsigned vector, int collapsed) @@ -198,10 +214,11 @@ int mlx4_cq_alloc(struct mlx4_dev *dev, int nent, struct mlx4_mtt *mtt, u64 mtt_addr; int err; - if (vector >= dev->caps.num_comp_vectors) - return -EINVAL; + cq->vector = (vector == MLX4_LEAST_ATTACHED_VECTOR) ? + mlx4_find_least_loaded_vector(priv) : vector; - cq->vector = vector; + if (cq->vector >= dev->caps.num_comp_vectors) + return -EINVAL; cq->cqn = mlx4_bitmap_alloc(&cq_table->bitmap); if (cq->cqn == -1) @@ -232,7 +249,7 @@ int mlx4_cq_alloc(struct mlx4_dev *dev, int nent, struct mlx4_mtt *mtt, cq_context->flags = cpu_to_be32(!!collapsed << 18); cq_context->logsize_usrpage = cpu_to_be32((ilog2(nent) << 24) | uar->index); - cq_context->comp_eqn = priv->eq_table.eq[vector].eqn; + cq_context->comp_eqn = priv->eq_table.eq[cq->vector].eqn; cq_context->log_page_size = mtt->page_shift - MLX4_ICM_PAGE_SHIFT; mtt_addr = mlx4_mtt_addr(dev, mtt); @@ -245,6 +262,7 @@ int mlx4_cq_alloc(struct mlx4_dev *dev, int nent, struct mlx4_mtt *mtt, if (err) goto err_radix; + priv->eq_table.eq[cq->vector].load++; cq->cons_index = 0; cq->arm_sn = 1; cq->uar = uar; @@ -282,6 +300,7 @@ void mlx4_cq_free(struct mlx4_dev *dev, struct mlx4_cq *cq) mlx4_warn(dev, "HW2SW_CQ failed (%d) for CQN %06x\n", err, cq->cqn); synchronize_irq(priv->eq_table.eq[cq->vector].irq); + priv->eq_table.eq[cq->vector].load--; spin_lock_irq(&cq_table->lock); radix_tree_delete(&cq_table->tree, cq->cqn); diff --git a/drivers/net/mlx4/en_cq.c b/drivers/net/mlx4/en_cq.c index 21786ad..f3dc8b7 100644 --- a/drivers/net/mlx4/en_cq.c +++ b/drivers/net/mlx4/en_cq.c @@ -56,7 +56,7 @@ int mlx4_en_create_cq(struct mlx4_en_priv *priv, cq->vector = ring % mdev->dev->caps.num_comp_vectors; } else { cq->buf_size = sizeof(struct mlx4_cqe); - cq->vector = 0; + cq->vector = MLX4_LEAST_ATTACHED_VECTOR; } cq->ring = ring; diff --git a/drivers/net/mlx4/mlx4.h b/drivers/net/mlx4/mlx4.h index 0da5bb7..d1112a8 100644 --- a/drivers/net/mlx4/mlx4.h +++ b/drivers/net/mlx4/mlx4.h @@ -137,6 +137,7 @@ struct mlx4_eq { u16 irq; u16 have_irq; int nent; + int load; struct mlx4_buf_list *page_list; struct mlx4_mtt mtt; }; diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h index ae09787..8afac02 100644 --- a/include/linux/mlx4/device.h +++ b/include/linux/mlx4/device.h @@ -166,6 +166,8 @@ enum mlx4_special_vlan_idx { MLX4_VLAN_REGULAR }; +#define MLX4_LEAST_ATTACHED_VECTOR 0xffffffff + static inline u64 mlx4_fw_ver(u64 major, u64 minor, u64 subminor) { return (major << 32) | (minor << 16) | subminor; diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 857b3b9..78dd555 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -1462,6 +1462,13 @@ static inline int ib_post_recv(struct ib_qp *qp, return qp->device->post_recv(qp, recv_wr, bad_recv_wr); } +/* + * IB_CQ_VECTOR_LEAST_ATTACHED: The constant specifies that + * the CQ will be attached to the completion vector that has + * the least number of CQs already attached to it. + */ +#define IB_CQ_VECTOR_LEAST_ATTACHED 0xffffffff + /** * ib_create_cq - Creates a CQ on the specified device. * @device: The device on which to create the CQ. @@ -1473,7 +1480,8 @@ static inline int ib_post_recv(struct ib_qp *qp, * the associated completion and event handlers. * @cqe: The minimum size of the CQ. * @comp_vector - Completion vector used to signal completion events. - * Must be >= 0 and < context->num_comp_vectors. + * Must be >= 0 and < context->num_comp_vectors + * or IB_CQ_VECTOR_LEAST_ATTACHED. * * Users can examine the cq structure to determine the actual CQ size. */ -- 1.6.3.3 --------------000200090704090601000104 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ ewg mailing list ewg-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ewg --------------000200090704090601000104--