From 04c335430f6d9f9088c852bc05a3a0c8baa921c4 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Fri, 14 Jul 2006 00:23:52 -0700 Subject: [PATCH] [PATCH] IB/cm: drop REQ when out of memory If a user of the IB CM returns -ENOMEM from their connection callback, simply drop the incoming REQ - do not attempt to send a reject. This should allow the sender to retry the request. Signed-off-by: Michael S. Tsirkin Signed-off-by: Sean Hefty Cc: Roland Dreier Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/infiniband/core/cm.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c index 3f6705f3083a..f85c97f7500a 100644 --- a/drivers/infiniband/core/cm.c +++ b/drivers/infiniband/core/cm.c @@ -701,7 +701,7 @@ static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) } } -void ib_destroy_cm_id(struct ib_cm_id *cm_id) +static void cm_destroy_id(struct ib_cm_id *cm_id, int err) { struct cm_id_private *cm_id_priv; struct cm_work *work; @@ -735,12 +735,22 @@ retest: sizeof cm_id_priv->av.port->cm_dev->ca_guid, NULL, 0); break; + case IB_CM_REQ_RCVD: + if (err == -ENOMEM) { + /* Do not reject to allow future retries. */ + cm_reset_to_idle(cm_id_priv); + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + } else { + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, + NULL, 0, NULL, 0); + } + break; case IB_CM_MRA_REQ_RCVD: case IB_CM_REP_SENT: case IB_CM_MRA_REP_RCVD: ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); /* Fall through */ - case IB_CM_REQ_RCVD: case IB_CM_MRA_REQ_SENT: case IB_CM_REP_RCVD: case IB_CM_MRA_REP_SENT: @@ -775,6 +785,11 @@ retest: kfree(cm_id_priv->private_data); kfree(cm_id_priv); } + +void ib_destroy_cm_id(struct ib_cm_id *cm_id) +{ + cm_destroy_id(cm_id, 0); +} EXPORT_SYMBOL(ib_destroy_cm_id); int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, @@ -1163,7 +1178,7 @@ static void cm_process_work(struct cm_id_private *cm_id_priv, } cm_deref_id(cm_id_priv); if (ret) - ib_destroy_cm_id(&cm_id_priv->id); + cm_destroy_id(&cm_id_priv->id, ret); } static void cm_format_mra(struct cm_mra_msg *mra_msg, -- 2.30.2