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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>
This commit is contained in:
Doug Ledford 2013-09-24 17:16:28 -04:00 committed by Roland Dreier
parent 29f27e8477
commit be9130cc92
1 changed files with 30 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/infiniband/core/cma.c
View File

@ -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;
}