IB/core: Expose ioctl interface through experimental Kconfig

Add CONFIG_INFINIBAND_EXP_USER_ACCESS that enables the ioctl
interface. This interface is experimental and is subject to change.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

3 files changed, 17 insertions, 0 deletions

diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig
index 234fe01904e7..3726205c8704 100644
--- a/drivers/infiniband/Kconfig
+++ b/drivers/infiniband/Kconfig
@@ -34,6 +34,15 @@ config INFINIBAND_USER_ACCESS
           libibverbs, libibcm and a hardware driver library from
           <http://www.openfabrics.org/git/>.
 
+config INFINIBAND_EXP_USER_ACCESS
+        bool "Allow experimental support for Infiniband ABI"
+        depends on INFINIBAND_USER_ACCESS
+        ---help---
+          IOCTL based ABI support for Infiniband. This allows userspace
+          to invoke the experimental IOCTL based ABI.
+          These commands are parsed via per-device parsing tree and
+          enables per-device features.
+
 config INFINIBAND_USER_MEM
         bool
         depends on INFINIBAND_USER_ACCESS != n
diff --git a/drivers/infiniband/core/uverbs.h b/drivers/infiniband/core/uverbs.h
index 0f6f768f687e..37c8903e7fd0 100644
--- a/drivers/infiniband/core/uverbs.h
+++ b/drivers/infiniband/core/uverbs.h
@@ -219,6 +219,8 @@ int uverbs_dealloc_mw(struct ib_mw *mw);
 void ib_uverbs_detach_umcast(struct ib_qp *qp,
                              struct ib_uqp_object *uobj);
 
+long ib_uverbs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+
 struct ib_uverbs_flow_spec {
         union {
                 union {
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index 872fec910c16..dc2aed6fb21b 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -939,6 +939,9 @@ static const struct file_operations uverbs_fops = {
         .open    = ib_uverbs_open,
         .release = ib_uverbs_close,
         .llseek  = no_llseek,
+#if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS)
+        .unlocked_ioctl = ib_uverbs_ioctl,
+#endif
 };
 
 static const struct file_operations uverbs_mmap_fops = {
@@ -948,6 +951,9 @@ static const struct file_operations uverbs_mmap_fops = {
         .open    = ib_uverbs_open,
         .release = ib_uverbs_close,
         .llseek  = no_llseek,
+#if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS)
+        .unlocked_ioctl = ib_uverbs_ioctl,
+#endif
 };
 
 static struct ib_client uverbs_client = {