RDMA/uverbs: Export XRC domains to user space

Allow user space to create XRC domains.  Because XRCDs are expected to
be shared among multiple processes, we use inodes to identify an XRCD.

Based on patches by Jack Morgenstein <jackm@dev.mellanox.co.il>

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

2 files changed, 20 insertions, 1 deletions

diff --git a/include/rdma/ib_user_verbs.h b/include/rdma/ib_user_verbs.h
index fe5b05177a2c..b5cb63f41f0f 100644
--- a/include/rdma/ib_user_verbs.h
+++ b/include/rdma/ib_user_verbs.h
@@ -81,7 +81,9 @@ enum {
         IB_USER_VERBS_CMD_MODIFY_SRQ,
         IB_USER_VERBS_CMD_QUERY_SRQ,
         IB_USER_VERBS_CMD_DESTROY_SRQ,
-        IB_USER_VERBS_CMD_POST_SRQ_RECV
+        IB_USER_VERBS_CMD_POST_SRQ_RECV,
+        IB_USER_VERBS_CMD_OPEN_XRCD,
+        IB_USER_VERBS_CMD_CLOSE_XRCD
 };
 
 /*
@@ -222,6 +224,21 @@ struct ib_uverbs_dealloc_pd {
         __u32 pd_handle;
 };
 
+struct ib_uverbs_open_xrcd {
+        __u64 response;
+        __u32 fd;
+        __u32 oflags;
+        __u64 driver_data[0];
+};
+
+struct ib_uverbs_open_xrcd_resp {
+        __u32 xrcd_handle;
+};
+
+struct ib_uverbs_close_xrcd {
+        __u32 xrcd_handle;
+};
+
 struct ib_uverbs_reg_mr {
         __u64 response;
         __u64 start;
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index ac46dcf04358..dfd9b87b7ffd 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -851,6 +851,7 @@ struct ib_ucontext {
         struct list_head        qp_list;
         struct list_head        srq_list;
         struct list_head        ah_list;
+        struct list_head        xrcd_list;
         int                     closing;
 };
 
@@ -881,6 +882,7 @@ struct ib_pd {
 struct ib_xrcd {
         struct ib_device       *device;
         atomic_t                usecnt; /* count all exposed resources */
+        struct inode           *inode;
 
         struct mutex            tgt_qp_mutex;
         struct list_head        tgt_qp_list;