Drivers that do not provide kernel verbs support should not be used by
ib kernel clients and fail.
In case a device does not implement all mandatory verbs for kverbs usage
mark it as a non kverbs provider and prevent its usage for all clients
except for uverbs.
The device is marked as a non kverbs provider using the
'kverbs_provider' flag which should only be set by the core code.
The clients can choose whether kverbs are requested for it usage using
the 'no_kverbs_req' flag which is currently set for uverbs only.
This patch allows drivers to remove mandatory verbs stubs and simply set
the callback to NULL. The IB device will be registered as a non-kverbs
provider.
Signed-off-by: Gal Pressman <galpress@xxxxxxxxxx>
---
drivers/infiniband/core/device.c | 12 ++++++++----
drivers/infiniband/core/uverbs_main.c | 1 +
include/rdma/ib_verbs.h | 5 +++++
3 files changed, 14 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 47ab34ee1a9d..6c1f71007ec4 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -121,13 +121,15 @@ static int ib_device_check_mandatory(struct ib_device *device)
};
int i;
+ device->kverbs_provider = true;
for (i = 0; i < ARRAY_SIZE(mandatory_table); ++i) {
if (!*(void **) ((void *) &device->ops +
mandatory_table[i].offset)) {
dev_warn(&device->dev,
- "Device is missing mandatory function %s\n",
+ "Device is missing mandatory function %s, disabling kverbs support\n",
mandatory_table[i].name);
- return -EINVAL;
+ device->kverbs_provider = false;
+ break;
}
}
@@ -624,7 +626,8 @@ int ib_register_device(struct ib_device *device, const char *name,
list_for_each_entry(client, &client_list, list)
if (!add_client_context(device, client) && client->add)
- client->add(device);
+ if (device->kverbs_provider || client->no_kverbs_req)
+ client->add(device);
down_write(&lists_rwsem);
list_add_tail(&device->core_list, &device_list);
@@ -721,7 +724,8 @@ int ib_register_client(struct ib_client *client)
list_for_each_entry(device, &device_list, core_list)
if (!add_client_context(device, client) && client->add)
- client->add(device);
+ if (device->kverbs_provider || client->no_kverbs_req)
+ client->add(device);
down_write(&lists_rwsem);
list_add_tail(&client->list, &client_list);
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index 9f9172eb1512..f0cef5693414 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -1128,6 +1128,7 @@ static const struct file_operations uverbs_mmap_fops = {
static struct ib_client uverbs_client = {
.name = "uverbs",
+ .no_kverbs_req = true,
.add = ib_uverbs_add_one,
.remove = ib_uverbs_remove_one
};
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index a3ceed3a040a..6ac5b7c3dddc 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2561,6 +2561,8 @@ struct ib_device {
__be64 node_guid;
u32 local_dma_lkey;
u16 is_switch:1;
+ /* Indicates kernel verbs support, should not be used in drivers */
+ u8 kverbs_provider:1;
u8 node_type;
u8 phys_port_cnt;
struct ib_device_attr attrs;
@@ -2615,6 +2617,9 @@ struct ib_client {
const struct sockaddr *addr,
void *client_data);
struct list_head list;
+
+ /* kverbs are not required by the device */
+ u8 no_kverbs_req:1;
};
struct ib_device *ib_alloc_device(size_t size);
--
2.7.4
