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MFV 29f27e847: "IB/cma: Use cached gids"

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This addresses a regression from an earlier upstream change which caused
cma_acquire_dev() to bypass the port GID cache and instead query the HCA
for each entry in its GID table. These queries can become extremely slow on
multiport devices, which has a negative impact on connection setup times.

Discussed with:	hselasky
Obtained from:	Linux
MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division
This commit is contained in:
Mark Johnston 2016-08-01 20:27:11 +00:00
parent 7212134272
commit 82f1d3ea2f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=303635
1 changed files with 7 additions and 8 deletions
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15
sys/ofed/drivers/infiniband/core/cma.c
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@ -485,7 +485,7 @@ static int cma_acquire_dev(struct rdma_id_private *id_priv)
struct cma_device *cma_dev;
union ib_gid gid, iboe_gid;
int ret = -ENODEV;
u8 port;
u8 port, found_port;
enum rdma_link_layer dev_ll = dev_addr->dev_type == ARPHRD_INFINIBAND ?
IB_LINK_LAYER_INFINIBAND : IB_LINK_LAYER_ETHERNET;
@ -500,21 +500,20 @@ static int cma_acquire_dev(struct rdma_id_private *id_priv)
memcpy(&gid, dev_addr->src_dev_addr +
rdma_addr_gid_offset(dev_addr), sizeof gid);
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 (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)
ret = find_gid_port(cma_dev->device, &iboe_gid, port);
ret = ib_find_cached_gid(cma_dev->device, &iboe_gid, &found_port, NULL);
else
ret = find_gid_port(cma_dev->device, &gid, port);
ret = ib_find_cached_gid(cma_dev->device, &gid, &found_port, NULL);
if (!ret) {
if (!ret && (port == found_port)) {
id_priv->id.port_num = port;
goto out;
} else if (ret == 1)
break;
}
}
break;
}
}
out: