From 7b59f0f9516040157450443b9df591556c0c49a9 Mon Sep 17 00:00:00 2001 From: Eran Ben Elisha Date: Thu, 15 Oct 2015 14:44:41 +0300 Subject: [PATCH] IB/mlx4: Add counter based implementation for QP multicast loopback block Current implementation for MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK is not supported when link layer is Ethernet. This patch will add counter based implementation for multicast loopback prevention. HW can drop multicast loopback packets if sender QP counter index is equal to receiver QP counter index. If qp flag MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK is set and link layer is Ethernet, create a new counter and attach it to the QP so it will continue receiving multicast loopback traffic but it's own. The decision if to create a new counter is being made at the qp modification to RTR after the QP's port is set. When QP is destroyed or moved back to reset state, delete the counter. Signed-off-by: Eran Ben Elisha Signed-off-by: Doug Ledford --- drivers/infiniband/hw/mlx4/mlx4_ib.h | 1 + drivers/infiniband/hw/mlx4/qp.c | 67 ++++++++++++++++++++++++++++ 2 files changed, 68 insertions(+) diff --git a/drivers/infiniband/hw/mlx4/mlx4_ib.h b/drivers/infiniband/hw/mlx4/mlx4_ib.h index 4056dc1c57cd..086416a863ae 100644 --- a/drivers/infiniband/hw/mlx4/mlx4_ib.h +++ b/drivers/infiniband/hw/mlx4/mlx4_ib.h @@ -320,6 +320,7 @@ struct mlx4_ib_qp { struct list_head qps_list; struct list_head cq_recv_list; struct list_head cq_send_list; + struct counter_index *counter_index; }; struct mlx4_ib_srq { diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c index 382913e35486..28719494ad6e 100644 --- a/drivers/infiniband/hw/mlx4/qp.c +++ b/drivers/infiniband/hw/mlx4/qp.c @@ -617,6 +617,18 @@ static int qp0_enabled_vf(struct mlx4_dev *dev, int qpn) return 0; } +static void mlx4_ib_free_qp_counter(struct mlx4_ib_dev *dev, + struct mlx4_ib_qp *qp) +{ + mutex_lock(&dev->counters_table[qp->port - 1].mutex); + mlx4_counter_free(dev->dev, qp->counter_index->index); + list_del(&qp->counter_index->list); + mutex_unlock(&dev->counters_table[qp->port - 1].mutex); + + kfree(qp->counter_index); + qp->counter_index = NULL; +} + static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd, struct ib_qp_init_attr *init_attr, struct ib_udata *udata, int sqpn, struct mlx4_ib_qp **caller_qp, @@ -1189,6 +1201,9 @@ int mlx4_ib_destroy_qp(struct ib_qp *qp) mutex_unlock(&dev->qp1_proxy_lock[mqp->port - 1]); } + if (mqp->counter_index) + mlx4_ib_free_qp_counter(dev, mqp); + pd = get_pd(mqp); destroy_qp_common(dev, mqp, !!pd->ibpd.uobject); @@ -1447,6 +1462,40 @@ static int handle_eth_ud_smac_index(struct mlx4_ib_dev *dev, struct mlx4_ib_qp * return 0; } +static int create_qp_lb_counter(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp) +{ + struct counter_index *new_counter_index; + int err; + u32 tmp_idx; + + if (rdma_port_get_link_layer(&dev->ib_dev, qp->port) != + IB_LINK_LAYER_ETHERNET || + !(qp->flags & MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK) || + !(dev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_LB_SRC_CHK)) + return 0; + + err = mlx4_counter_alloc(dev->dev, &tmp_idx); + if (err) + return err; + + new_counter_index = kmalloc(sizeof(*new_counter_index), GFP_KERNEL); + if (!new_counter_index) { + mlx4_counter_free(dev->dev, tmp_idx); + return -ENOMEM; + } + + new_counter_index->index = tmp_idx; + new_counter_index->allocated = 1; + qp->counter_index = new_counter_index; + + mutex_lock(&dev->counters_table[qp->port - 1].mutex); + list_add_tail(&new_counter_index->list, + &dev->counters_table[qp->port - 1].counters_list); + mutex_unlock(&dev->counters_table[qp->port - 1].mutex); + + return 0; +} + static int __mlx4_ib_modify_qp(struct ib_qp *ibqp, const struct ib_qp_attr *attr, int attr_mask, enum ib_qp_state cur_state, enum ib_qp_state new_state) @@ -1520,6 +1569,9 @@ static int __mlx4_ib_modify_qp(struct ib_qp *ibqp, context->sq_size_stride = ilog2(qp->sq.wqe_cnt) << 3; context->sq_size_stride |= qp->sq.wqe_shift - 4; + if (new_state == IB_QPS_RESET && qp->counter_index) + mlx4_ib_free_qp_counter(dev, qp); + if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) { context->sq_size_stride |= !!qp->sq_no_prefetch << 7; context->xrcd = cpu_to_be32((u32) qp->xrcdn); @@ -1544,11 +1596,24 @@ static int __mlx4_ib_modify_qp(struct ib_qp *ibqp, } if (cur_state == IB_QPS_INIT && new_state == IB_QPS_RTR) { + err = create_qp_lb_counter(dev, qp); + if (err) + goto out; + counter_index = dev->counters_table[qp->port - 1].default_counter; + if (qp->counter_index) + counter_index = qp->counter_index->index; + if (counter_index != -1) { context->pri_path.counter_index = counter_index; optpar |= MLX4_QP_OPTPAR_COUNTER_INDEX; + if (qp->counter_index) { + context->pri_path.fl |= + MLX4_FL_ETH_SRC_CHECK_MC_LB; + context->pri_path.vlan_control |= + MLX4_CTRL_ETH_SRC_CHECK_IF_COUNTER; + } } else context->pri_path.counter_index = MLX4_SINK_COUNTER_INDEX(dev->dev); @@ -1850,6 +1915,8 @@ static int __mlx4_ib_modify_qp(struct ib_qp *ibqp, } } out: + if (err && qp->counter_index) + mlx4_ib_free_qp_counter(dev, qp); if (err && steer_qp) mlx4_ib_steer_qp_reg(dev, qp, 0); kfree(context); -- 2.20.1