Adding a helper function to retrieve the driver gid context
from the gid attr.
Suggested-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Selvin Xavier <selvin.xavier@xxxxxxxxxxxx>
---
drivers/infiniband/core/cache.c | 41 +++++++++++++++++++++++++++++++++++++++++
include/rdma/ib_cache.h | 1 +
2 files changed, 42 insertions(+)
diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
index 17bfedd..1b73a71 100644
--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -973,6 +973,47 @@ int rdma_query_gid(struct ib_device *device, u8 port_num,
EXPORT_SYMBOL(rdma_query_gid);
/**
+ * rdma_read_gid_hw_context - Read the HW GID context from GID attribute
+ * @attr: Potinter to the GID attribute
+ *
+ * rdma_read_gid_hw_context() reads the vendor drivers GID HW
+ * context corresponding to SGID attr. It takes reference to the GID
+ * attribute and this need to be released by the caller using
+ * rdma_put_gid_attr
+ *
+ * Returns HW context on success or NULL on error
+ *
+ */
+void *rdma_read_gid_hw_context(const struct ib_gid_attr *attr)
+{
+ struct ib_gid_table_entry *entry =
+ container_of(attr, struct ib_gid_table_entry, attr);
+ struct ib_device *device = entry->attr.device;
+ u8 port_num = entry->attr.port_num;
+ struct ib_gid_table *table;
+ unsigned long flags;
+ void *context = NULL;
+
+ if (!rdma_is_port_valid(device, port_num))
+ return NULL;
+
+ table = rdma_gid_table(device, port_num);
+ read_lock_irqsave(&table->rwlock, flags);
+
+ if (attr->index < 0 || attr->index >= table->sz ||
+ !is_gid_entry_valid(table->data_vec[attr->index]))
+ goto done;
+
+ get_gid_entry(entry);
+ context = entry->context;
+
+done:
+ read_unlock_irqrestore(&table->rwlock, flags);
+ return context;
+}
+EXPORT_SYMBOL(rdma_read_gid_hw_context);
+
+/**
* rdma_find_gid - Returns SGID attributes if the matching GID is found.
* @device: The device to query.
* @gid: The GID value to search for.
diff --git a/include/rdma/ib_cache.h b/include/rdma/ib_cache.h
index 870b5e6..e06d133 100644
--- a/include/rdma/ib_cache.h
+++ b/include/rdma/ib_cache.h
@@ -39,6 +39,7 @@
int rdma_query_gid(struct ib_device *device, u8 port_num, int index,
union ib_gid *gid);
+void *rdma_read_gid_hw_context(const struct ib_gid_attr *attr);
const struct ib_gid_attr *rdma_find_gid(struct ib_device *device,
const union ib_gid *gid,
enum ib_gid_type gid_type,
--
2.5.5
