summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--drivers/infiniband/core/cma.c41
-rw-r--r--drivers/infiniband/core/cma_priv.h2
-rw-r--r--include/rdma/rdma_cm.h2
3 files changed, 45 insertions, 0 deletions
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index ca5ff35a5dc6..bb7bd024f3bd 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -843,6 +843,7 @@ __rdma_create_id(struct net *net, rdma_cm_event_handler event_handler,
id_priv->id.qp_type = qp_type;
id_priv->tos_set = false;
id_priv->timeout_set = false;
+ id_priv->min_rnr_timer_set = false;
id_priv->gid_type = IB_GID_TYPE_IB;
spin_lock_init(&id_priv->lock);
mutex_init(&id_priv->qp_mutex);
@@ -1133,6 +1134,9 @@ int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set)
qp_attr->timeout = id_priv->timeout;
+ if ((*qp_attr_mask & IB_QP_MIN_RNR_TIMER) && id_priv->min_rnr_timer_set)
+ qp_attr->min_rnr_timer = id_priv->min_rnr_timer;
+
return ret;
}
EXPORT_SYMBOL(rdma_init_qp_attr);
@@ -2608,6 +2612,43 @@ int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
}
EXPORT_SYMBOL(rdma_set_ack_timeout);
+/**
+ * rdma_set_min_rnr_timer() - Set the minimum RNR Retry timer of the
+ * QP associated with a connection identifier.
+ * @id: Communication identifier to associated with service type.
+ * @min_rnr_timer: 5-bit value encoded as Table 45: "Encoding for RNR NAK
+ * Timer Field" in the IBTA specification.
+ *
+ * This function should be called before rdma_connect() on active
+ * side, and on passive side before rdma_accept(). The timer value
+ * will be associated with the local QP. When it receives a send it is
+ * not read to handle, typically if the receive queue is empty, an RNR
+ * Retry NAK is returned to the requester with the min_rnr_timer
+ * encoded. The requester will then wait at least the time specified
+ * in the NAK before retrying. The default is zero, which translates
+ * to a minimum RNR Timer value of 655 ms.
+ *
+ * Return: 0 for success
+ */
+int rdma_set_min_rnr_timer(struct rdma_cm_id *id, u8 min_rnr_timer)
+{
+ struct rdma_id_private *id_priv;
+
+ /* It is a five-bit value */
+ if (min_rnr_timer & 0xe0)
+ return -EINVAL;
+
+ if (WARN_ON(id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_TGT))
+ return -EINVAL;
+
+ id_priv = container_of(id, struct rdma_id_private, id);
+ id_priv->min_rnr_timer = min_rnr_timer;
+ id_priv->min_rnr_timer_set = true;
+
+ return 0;
+}
+EXPORT_SYMBOL(rdma_set_min_rnr_timer);
+
static void cma_query_handler(int status, struct sa_path_rec *path_rec,
void *context)
{
diff --git a/drivers/infiniband/core/cma_priv.h b/drivers/infiniband/core/cma_priv.h
index 8af6af4bbf6e..5c463da99845 100644
--- a/drivers/infiniband/core/cma_priv.h
+++ b/drivers/infiniband/core/cma_priv.h
@@ -86,9 +86,11 @@ struct rdma_id_private {
u8 tos;
u8 tos_set:1;
u8 timeout_set:1;
+ u8 min_rnr_timer_set:1;
u8 reuseaddr;
u8 afonly;
u8 timeout;
+ u8 min_rnr_timer;
enum ib_gid_type gid_type;
/*
diff --git a/include/rdma/rdma_cm.h b/include/rdma/rdma_cm.h
index b2eed6d30543..d989f030fae0 100644
--- a/include/rdma/rdma_cm.h
+++ b/include/rdma/rdma_cm.h
@@ -331,6 +331,8 @@ int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse);
int rdma_set_afonly(struct rdma_cm_id *id, int afonly);
int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout);
+
+int rdma_set_min_rnr_timer(struct rdma_cm_id *id, u8 min_rnr_timer);
/**
* rdma_get_service_id - Return the IB service ID for a specified address.
* @id: Communication identifier associated with the address.