From c93b6fbaa99bb3a1552e14317296be14dde51dfb Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Sat, 17 Jun 2006 20:37:41 -0700 Subject: IB/mthca: Make all device methods truly reentrant Documentation/infiniband/core_locking.txt says: All of the methods in struct ib_device exported by a low-level driver must be fully reentrant. The low-level driver is required to perform all synchronization necessary to maintain consistency, even if multiple function calls using the same object are run simultaneously. However, mthca's modify_qp, modify_srq and resize_cq methods are currently not reentrant. Add a mutex to the QP, SRQ and CQ structures so that these calls can be properly serialized. Signed-off-by: Roland Dreier --- drivers/infiniband/hw/mthca/mthca_qp.c | 38 ++++++++++++++++++++-------------- 1 file changed, 23 insertions(+), 15 deletions(-) (limited to 'drivers/infiniband/hw/mthca/mthca_qp.c') diff --git a/drivers/infiniband/hw/mthca/mthca_qp.c b/drivers/infiniband/hw/mthca/mthca_qp.c index 322bc32a93f..16c387d8170 100644 --- a/drivers/infiniband/hw/mthca/mthca_qp.c +++ b/drivers/infiniband/hw/mthca/mthca_qp.c @@ -536,6 +536,8 @@ int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask) u8 status; int err = -EINVAL; + mutex_lock(&qp->mutex); + if (attr_mask & IB_QP_CUR_STATE) { cur_state = attr->cur_qp_state; } else { @@ -553,39 +555,41 @@ int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask) "%d->%d with attr 0x%08x\n", qp->transport, cur_state, new_state, attr_mask); - return -EINVAL; + goto out; } if ((attr_mask & IB_QP_PKEY_INDEX) && attr->pkey_index >= dev->limits.pkey_table_len) { mthca_dbg(dev, "P_Key index (%u) too large. max is %d\n", attr->pkey_index, dev->limits.pkey_table_len-1); - return -EINVAL; + goto out; } if ((attr_mask & IB_QP_PORT) && (attr->port_num == 0 || attr->port_num > dev->limits.num_ports)) { mthca_dbg(dev, "Port number (%u) is invalid\n", attr->port_num); - return -EINVAL; + goto out; } if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC && attr->max_rd_atomic > dev->limits.max_qp_init_rdma) { mthca_dbg(dev, "Max rdma_atomic as initiator %u too large (max is %d)\n", attr->max_rd_atomic, dev->limits.max_qp_init_rdma); - return -EINVAL; + goto out; } if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC && attr->max_dest_rd_atomic > 1 << dev->qp_table.rdb_shift) { mthca_dbg(dev, "Max rdma_atomic as responder %u too large (max %d)\n", attr->max_dest_rd_atomic, 1 << dev->qp_table.rdb_shift); - return -EINVAL; + goto out; } mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL); - if (IS_ERR(mailbox)) - return PTR_ERR(mailbox); + if (IS_ERR(mailbox)) { + err = PTR_ERR(mailbox); + goto out; + } qp_param = mailbox->buf; qp_context = &qp_param->context; memset(qp_param, 0, sizeof *qp_param); @@ -618,7 +622,7 @@ int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask) if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_2048) { mthca_dbg(dev, "path MTU (%u) is invalid\n", attr->path_mtu); - goto out; + goto out_mailbox; } qp_context->mtu_msgmax = (attr->path_mtu << 5) | 31; } @@ -672,7 +676,7 @@ int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask) if (attr_mask & IB_QP_AV) { if (mthca_path_set(dev, &attr->ah_attr, &qp_context->pri_path, attr_mask & IB_QP_PORT ? attr->port_num : qp->port)) - goto out; + goto out_mailbox; qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_PRIMARY_ADDR_PATH); } @@ -686,18 +690,18 @@ int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask) if (attr->alt_pkey_index >= dev->limits.pkey_table_len) { mthca_dbg(dev, "Alternate P_Key index (%u) too large. max is %d\n", attr->alt_pkey_index, dev->limits.pkey_table_len-1); - goto out; + goto out_mailbox; } if (attr->alt_port_num == 0 || attr->alt_port_num > dev->limits.num_ports) { mthca_dbg(dev, "Alternate port number (%u) is invalid\n", attr->alt_port_num); - goto out; + goto out_mailbox; } if (mthca_path_set(dev, &attr->alt_ah_attr, &qp_context->alt_path, attr->alt_ah_attr.port_num)) - goto out; + goto out_mailbox; qp_context->alt_path.port_pkey |= cpu_to_be32(attr->alt_pkey_index | attr->alt_port_num << 24); @@ -793,12 +797,12 @@ int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask) err = mthca_MODIFY_QP(dev, cur_state, new_state, qp->qpn, 0, mailbox, sqd_event, &status); if (err) - goto out; + goto out_mailbox; if (status) { mthca_warn(dev, "modify QP %d->%d returned status %02x.\n", cur_state, new_state, status); err = -EINVAL; - goto out; + goto out_mailbox; } qp->state = new_state; @@ -853,8 +857,11 @@ int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask) } } -out: +out_mailbox: mthca_free_mailbox(dev, mailbox); + +out: + mutex_unlock(&qp->mutex); return err; } @@ -1100,6 +1107,7 @@ static int mthca_alloc_qp_common(struct mthca_dev *dev, qp->refcount = 1; init_waitqueue_head(&qp->wait); + mutex_init(&qp->mutex); qp->state = IB_QPS_RESET; qp->atomic_rd_en = 0; qp->resp_depth = 0; -- cgit v1.2.3