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authorDoug Ledford <dledford@redhat.com>2013-09-24 17:16:28 -0400
committerRoland Dreier <roland@purestorage.com>2013-11-08 14:42:24 -0800
commitbe9130cc927f13ad0159650ed03159ecc82c0262 (patch)
tree54be73e8facf7b0692c28a611d5b30a95b1651a4 /drivers/infiniband/core/cma.c
parent29f27e8477aee4e619889add998a1976d67b60a5 (diff)
IB/cma: Check for GID on listening device first
As a simple optimization that should speed up the vast majority of connect attemps on IB devices, when we are searching for the GID of an incoming connection in the cached GID lists of devices, search the device that received the incoming connection request first. If we don't find it there, then move on to other devices. This reduces the time to perform 10,000 connections considerably. Prior to this patch, a bad run of cmtime would look like this: connect : 12399.26 12351.10 8609.00 1239.93 With this patch, it looks more like this: connect : 5864.86 5799.80 8876.00 586.49 Signed-off-by: Doug Ledford <dledford@redhat.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/core/cma.c')
-rw-r--r--drivers/infiniband/core/cma.c36
1 files changed, 30 insertions, 6 deletions
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index c62ff9e7f8c6..dadc486b92f0 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -349,7 +349,8 @@ static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_a
return ret;
}
-static int cma_acquire_dev(struct rdma_id_private *id_priv)
+static int cma_acquire_dev(struct rdma_id_private *id_priv,
+ struct rdma_id_private *listen_id_priv)
{
struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
struct cma_device *cma_dev;
@@ -367,8 +368,30 @@ static int cma_acquire_dev(struct rdma_id_private *id_priv)
iboe_addr_get_sgid(dev_addr, &iboe_gid);
memcpy(&gid, dev_addr->src_dev_addr +
rdma_addr_gid_offset(dev_addr), sizeof gid);
+ if (listen_id_priv &&
+ rdma_port_get_link_layer(listen_id_priv->id.device,
+ listen_id_priv->id.port_num) == dev_ll) {
+ cma_dev = listen_id_priv->cma_dev;
+ port = listen_id_priv->id.port_num;
+ if (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB &&
+ rdma_port_get_link_layer(cma_dev->device, port) == IB_LINK_LAYER_ETHERNET)
+ ret = ib_find_cached_gid(cma_dev->device, &iboe_gid,
+ &found_port, NULL);
+ else
+ ret = ib_find_cached_gid(cma_dev->device, &gid,
+ &found_port, NULL);
+
+ if (!ret && (port == found_port)) {
+ id_priv->id.port_num = found_port;
+ goto out;
+ }
+ }
list_for_each_entry(cma_dev, &dev_list, list) {
- for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port)
+ for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
+ if (listen_id_priv &&
+ listen_id_priv->cma_dev == cma_dev &&
+ listen_id_priv->id.port_num == port)
+ continue;
if (rdma_port_get_link_layer(cma_dev->device, port) == dev_ll) {
if (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB &&
rdma_port_get_link_layer(cma_dev->device, port) == IB_LINK_LAYER_ETHERNET)
@@ -381,6 +404,7 @@ static int cma_acquire_dev(struct rdma_id_private *id_priv)
goto out;
}
}
+ }
}
out:
@@ -1269,7 +1293,7 @@ static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
}
mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
- ret = cma_acquire_dev(conn_id);
+ ret = cma_acquire_dev(conn_id, listen_id);
if (ret)
goto err2;
@@ -1458,7 +1482,7 @@ static int iw_conn_req_handler(struct iw_cm_id *cm_id,
goto out;
}
- ret = cma_acquire_dev(conn_id);
+ ret = cma_acquire_dev(conn_id, listen_id);
if (ret) {
mutex_unlock(&conn_id->handler_mutex);
rdma_destroy_id(new_cm_id);
@@ -2027,7 +2051,7 @@ static void addr_handler(int status, struct sockaddr *src_addr,
goto out;
if (!status && !id_priv->cma_dev)
- status = cma_acquire_dev(id_priv);
+ status = cma_acquire_dev(id_priv, NULL);
if (status) {
if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
@@ -2524,7 +2548,7 @@ int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
if (ret)
goto err1;
- ret = cma_acquire_dev(id_priv);
+ ret = cma_acquire_dev(id_priv, NULL);
if (ret)
goto err1;
}

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