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IB/core: don't search the GID table twice

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Previously, we've searched the GID table twice: first when we searched
the table for a GID matching the proposed new one, and second when we
didn't find a match, we searched again for an empty GID slot in the
table.  Instead, search the table once noting the first empty slot as
we search for our target GID.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Matan Barak 2015-10-28 16:52:41 +02:00 committed by Doug Ledford
parent 9c584f0495
commit cee3c4d0c5
1 changed files with 35 additions and 18 deletions
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53
drivers/infiniband/core/cache.c
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@ -208,19 +208,33 @@ static int del_gid(struct ib_device *ib_dev, u8 port,
/* rwlock should be read locked */
static int find_gid(struct ib_gid_table *table, const union ib_gid *gid,
const struct ib_gid_attr *val, bool default_gid,
unsigned long mask)
unsigned long mask, int *pempty)
{
int i;
int i = 0;
int found = -1;
int empty = pempty ? -1 : 0;
for (i = 0; i < table->sz; i++) {
struct ib_gid_attr *attr = &table->data_vec[i].attr;
while (i < table->sz && (found < 0 || empty < 0)) {
struct ib_gid_table_entry *data = &table->data_vec[i];
struct ib_gid_attr *attr = &data->attr;
int curr_index = i;
i++;
if (table->data_vec[i].props & GID_TABLE_ENTRY_INVALID)
if (data->props & GID_TABLE_ENTRY_INVALID)
continue;
if (empty < 0)
if (!memcmp(&data->gid, &zgid, sizeof(*gid)) &&
!memcmp(attr, &zattr, sizeof(*attr)) &&
!data->props)
empty = curr_index;
if (found >= 0)
continue;
if (mask & GID_ATTR_FIND_MASK_GID &&
memcmp(gid, &table->data_vec[i].gid, sizeof(*gid)))
memcmp(gid, &data->gid, sizeof(*gid)))
continue;
if (mask & GID_ATTR_FIND_MASK_NETDEV &&
@ -228,14 +242,17 @@ static int find_gid(struct ib_gid_table *table, const union ib_gid *gid,
continue;
if (mask & GID_ATTR_FIND_MASK_DEFAULT &&
!!(table->data_vec[i].props & GID_TABLE_ENTRY_DEFAULT) !=
!!(data->props & GID_TABLE_ENTRY_DEFAULT) !=
default_gid)
continue;
break;
found = curr_index;
}
return i == table->sz ? -1 : i;
if (pempty)
*pempty = empty;
return found;
}
static void make_default_gid(struct net_device *dev, union ib_gid *gid)
@ -252,6 +269,7 @@ int ib_cache_gid_add(struct ib_device *ib_dev, u8 port,
int ix;
int ret = 0;
struct net_device *idev;
int empty;
table = ports_table[port - rdma_start_port(ib_dev)];
@ -278,18 +296,16 @@ int ib_cache_gid_add(struct ib_device *ib_dev, u8 port,
write_lock_irq(&table->rwlock);
ix = find_gid(table, gid, attr, false, GID_ATTR_FIND_MASK_GID |
GID_ATTR_FIND_MASK_NETDEV);
GID_ATTR_FIND_MASK_NETDEV, &empty);
if (ix >= 0)
goto out_unlock;
ix = find_gid(table, &zgid, NULL, false, GID_ATTR_FIND_MASK_GID |
GID_ATTR_FIND_MASK_DEFAULT);
if (ix < 0) {
if (empty < 0) {
ret = -ENOSPC;
goto out_unlock;
}
ret = add_gid(ib_dev, port, table, ix, gid, attr, false);
ret = add_gid(ib_dev, port, table, empty, gid, attr, false);
if (!ret)
dispatch_gid_change_event(ib_dev, port);
@ -314,7 +330,8 @@ int ib_cache_gid_del(struct ib_device *ib_dev, u8 port,
ix = find_gid(table, gid, attr, false,
GID_ATTR_FIND_MASK_GID |
GID_ATTR_FIND_MASK_NETDEV |
GID_ATTR_FIND_MASK_DEFAULT);
GID_ATTR_FIND_MASK_DEFAULT,
NULL);
if (ix < 0)
goto out_unlock;
@ -393,7 +410,7 @@ static int _ib_cache_gid_table_find(struct ib_device *ib_dev,
for (p = 0; p < ib_dev->phys_port_cnt; p++) {
table = ports_table[p];
read_lock_irqsave(&table->rwlock, flags);
local_index = find_gid(table, gid, val, false, mask);
local_index = find_gid(table, gid, val, false, mask, NULL);
if (local_index >= 0) {
if (index)
*index = local_index;
@ -445,7 +462,7 @@ int ib_find_cached_gid_by_port(struct ib_device *ib_dev,
mask |= GID_ATTR_FIND_MASK_NETDEV;
read_lock_irqsave(&table->rwlock, flags);
local_index = find_gid(table, gid, &val, false, mask);
local_index = find_gid(table, gid, &val, false, mask, NULL);
if (local_index >= 0) {
if (index)
*index = local_index;
@ -608,7 +625,7 @@ void ib_cache_gid_set_default_gid(struct ib_device *ib_dev, u8 port,
mutex_lock(&table->lock);
write_lock_irq(&table->rwlock);
ix = find_gid(table, NULL, NULL, true, GID_ATTR_FIND_MASK_DEFAULT);
ix = find_gid(table, NULL, NULL, true, GID_ATTR_FIND_MASK_DEFAULT, NULL);
/* Coudn't find default GID location */
WARN_ON(ix < 0);