IB/cache: Add ib_find_gid_by_filter cache API
GID cache API users might want to search for GIDs with specific
attributes rather than just specifying GID, net device and port.
This is used in a later patch, where we find the sgid index by
L2 Ethernet attributes.
Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-By: Devesh Sharma <devesh.sharma@avagotech.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
index 639a726..89bebea 100644
--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -440,6 +440,81 @@
}
EXPORT_SYMBOL(ib_find_cached_gid_by_port);
+/**
+ * ib_find_gid_by_filter - Returns the GID table index where a specified
+ * GID value occurs
+ * @device: The device to query.
+ * @gid: The GID value to search for.
+ * @port_num: The port number of the device where the GID value could be
+ * searched.
+ * @filter: The filter function is executed on any matching GID in the table.
+ * If the filter function returns true, the corresponding index is returned,
+ * otherwise, we continue searching the GID table. It's guaranteed that
+ * while filter is executed, ndev field is valid and the structure won't
+ * change. filter is executed in an atomic context. filter must not be NULL.
+ * @index: The index into the cached GID table where the GID was found. This
+ * parameter may be NULL.
+ *
+ * ib_cache_gid_find_by_filter() searches for the specified GID value
+ * of which the filter function returns true in the port's GID table.
+ * This function is only supported on RoCE ports.
+ *
+ */
+static int ib_cache_gid_find_by_filter(struct ib_device *ib_dev,
+ const union ib_gid *gid,
+ u8 port,
+ bool (*filter)(const union ib_gid *,
+ const struct ib_gid_attr *,
+ void *),
+ void *context,
+ u16 *index)
+{
+ struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
+ struct ib_gid_table *table;
+ unsigned int i;
+ bool found = false;
+
+ if (!ports_table)
+ return -EOPNOTSUPP;
+
+ if (port < rdma_start_port(ib_dev) ||
+ port > rdma_end_port(ib_dev) ||
+ !rdma_protocol_roce(ib_dev, port))
+ return -EPROTONOSUPPORT;
+
+ table = ports_table[port - rdma_start_port(ib_dev)];
+
+ for (i = 0; i < table->sz; i++) {
+ struct ib_gid_attr attr;
+ unsigned long flags;
+
+ read_lock_irqsave(&table->data_vec[i].lock, flags);
+ if (table->data_vec[i].props & GID_TABLE_ENTRY_INVALID)
+ goto next;
+
+ if (memcmp(gid, &table->data_vec[i].gid, sizeof(*gid)))
+ goto next;
+
+ memcpy(&attr, &table->data_vec[i].attr, sizeof(attr));
+
+ if (filter(gid, &attr, context))
+ found = true;
+
+next:
+ read_unlock_irqrestore(&table->data_vec[i].lock, flags);
+
+ if (found)
+ break;
+ }
+
+ if (!found)
+ return -ENOENT;
+
+ if (index)
+ *index = i;
+ return 0;
+}
+
static struct ib_gid_table *alloc_gid_table(int sz)
{
unsigned int i;
@@ -670,6 +745,24 @@
}
EXPORT_SYMBOL(ib_find_cached_gid);
+int ib_find_gid_by_filter(struct ib_device *device,
+ const union ib_gid *gid,
+ u8 port_num,
+ bool (*filter)(const union ib_gid *gid,
+ const struct ib_gid_attr *,
+ void *),
+ void *context, u16 *index)
+{
+ /* Only RoCE GID table supports filter function */
+ if (!rdma_cap_roce_gid_table(device, port_num) && filter)
+ return -EPROTONOSUPPORT;
+
+ return ib_cache_gid_find_by_filter(device, gid,
+ port_num, filter,
+ context, index);
+}
+EXPORT_SYMBOL(ib_find_gid_by_filter);
+
int ib_get_cached_pkey(struct ib_device *device,
u8 port_num,
int index,
diff --git a/include/rdma/ib_cache.h b/include/rdma/ib_cache.h
index 679d7ca..269a27cf 100644
--- a/include/rdma/ib_cache.h
+++ b/include/rdma/ib_cache.h
@@ -93,6 +93,14 @@
u8 port_num,
struct net_device *ndev,
u16 *index);
+
+int ib_find_gid_by_filter(struct ib_device *device,
+ const union ib_gid *gid,
+ u8 port_num,
+ bool (*filter)(const union ib_gid *gid,
+ const struct ib_gid_attr *,
+ void *),
+ void *context, u16 *index);
/**
* ib_get_cached_pkey - Returns a cached PKey table entry
* @device: The device to query.