From d2ca39f262806aa2f035f680a14aa55ff9e3d889 Mon Sep 17 00:00:00 2001 From: Yossi Etigin Date: Wed, 8 Apr 2009 13:42:33 -0700 Subject: [PATCH] RDMA/cma: Create cm id even when IB port is down When doing rdma_resolve_addr(), if the relevant IB port is down, the function fails and the cm_id is not bound to the correct device. Therefore, application does not have a device handle and cannot wait for the port to become active. The function fails because the underlying IPoIB interface is not joined to the broadcast group and therefore the SA does not have a multicast record to take a Q_Key from. The fix is to use lazy Q_Key resolution - cma_set_qkey() will set id_priv->qkey if it was not set, and will be called just before the Q_Key is really required. Signed-off-by: Yossi Etigin Acked-by: Sean Hefty Signed-off-by: Roland Dreier --- drivers/infiniband/core/cma.c | 41 +++++++++++++++++++++++------------ 1 file changed, 27 insertions(+), 14 deletions(-) diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index 3f9c03a3657..851de83ff45 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -297,21 +297,25 @@ static void cma_detach_from_dev(struct rdma_id_private *id_priv) id_priv->cma_dev = NULL; } -static int cma_set_qkey(struct ib_device *device, u8 port_num, - enum rdma_port_space ps, - struct rdma_dev_addr *dev_addr, u32 *qkey) +static int cma_set_qkey(struct rdma_id_private *id_priv) { struct ib_sa_mcmember_rec rec; int ret = 0; - switch (ps) { + if (id_priv->qkey) + return 0; + + switch (id_priv->id.ps) { case RDMA_PS_UDP: - *qkey = RDMA_UDP_QKEY; + id_priv->qkey = RDMA_UDP_QKEY; break; case RDMA_PS_IPOIB: - ib_addr_get_mgid(dev_addr, &rec.mgid); - ret = ib_sa_get_mcmember_rec(device, port_num, &rec.mgid, &rec); - *qkey = be32_to_cpu(rec.qkey); + ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid); + ret = ib_sa_get_mcmember_rec(id_priv->id.device, + id_priv->id.port_num, &rec.mgid, + &rec); + if (!ret) + id_priv->qkey = be32_to_cpu(rec.qkey); break; default: break; @@ -341,12 +345,7 @@ static int cma_acquire_dev(struct rdma_id_private *id_priv) ret = ib_find_cached_gid(cma_dev->device, &gid, &id_priv->id.port_num, NULL); if (!ret) { - ret = cma_set_qkey(cma_dev->device, - id_priv->id.port_num, - id_priv->id.ps, dev_addr, - &id_priv->qkey); - if (!ret) - cma_attach_to_dev(id_priv, cma_dev); + cma_attach_to_dev(id_priv, cma_dev); break; } } @@ -578,6 +577,10 @@ static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv, *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT; if (cma_is_ud_ps(id_priv->id.ps)) { + ret = cma_set_qkey(id_priv); + if (ret) + return ret; + qp_attr->qkey = id_priv->qkey; *qp_attr_mask |= IB_QP_QKEY; } else { @@ -2201,6 +2204,12 @@ static int cma_sidr_rep_handler(struct ib_cm_id *cm_id, event.status = ib_event->param.sidr_rep_rcvd.status; break; } + ret = cma_set_qkey(id_priv); + if (ret) { + event.event = RDMA_CM_EVENT_ADDR_ERROR; + event.status = -EINVAL; + break; + } if (id_priv->qkey != rep->qkey) { event.event = RDMA_CM_EVENT_UNREACHABLE; event.status = -EINVAL; @@ -2480,10 +2489,14 @@ static int cma_send_sidr_rep(struct rdma_id_private *id_priv, const void *private_data, int private_data_len) { struct ib_cm_sidr_rep_param rep; + int ret; memset(&rep, 0, sizeof rep); rep.status = status; if (status == IB_SIDR_SUCCESS) { + ret = cma_set_qkey(id_priv); + if (ret) + return ret; rep.qp_num = id_priv->qp_num; rep.qkey = id_priv->qkey; } -- 2.39.2