RDMA/ucma: Allow user space to set service type

Export the ability to set the type of service to user space.  Model
the interface after setsockopt.

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

2 files changed, 91 insertions, 1 deletions

diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index 53b4c94a7e..90d675ad9e 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -792,6 +792,78 @@ out:
         return ret;
 }
 
+static int ucma_set_option_id(struct ucma_context *ctx, int optname,
+                              void *optval, size_t optlen)
+{
+        int ret = 0;
+
+        switch (optname) {
+        case RDMA_OPTION_ID_TOS:
+                if (optlen != sizeof(u8)) {
+                        ret = -EINVAL;
+                        break;
+                }
+                rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
+                break;
+        default:
+                ret = -ENOSYS;
+        }
+
+        return ret;
+}
+
+static int ucma_set_option_level(struct ucma_context *ctx, int level,
+                                 int optname, void *optval, size_t optlen)
+{
+        int ret;
+
+        switch (level) {
+        case RDMA_OPTION_ID:
+                ret = ucma_set_option_id(ctx, optname, optval, optlen);
+                break;
+        default:
+                ret = -ENOSYS;
+        }
+
+        return ret;
+}
+
+static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
+                               int in_len, int out_len)
+{
+        struct rdma_ucm_set_option cmd;
+        struct ucma_context *ctx;
+        void *optval;
+        int ret;
+
+        if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
+                return -EFAULT;
+
+        ctx = ucma_get_ctx(file, cmd.id);
+        if (IS_ERR(ctx))
+                return PTR_ERR(ctx);
+
+        optval = kmalloc(cmd.optlen, GFP_KERNEL);
+        if (!optval) {
+                ret = -ENOMEM;
+                goto out1;
+        }
+
+        if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval,
+                           cmd.optlen)) {
+                ret = -EFAULT;
+                goto out2;
+        }
+
+        ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
+                                    cmd.optlen);
+out2:
+        kfree(optval);
+out1:
+        ucma_put_ctx(ctx);
+        return ret;
+}
+
 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
                            int in_len, int out_len)
 {
@@ -936,7 +1008,7 @@ static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
         [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
         [RDMA_USER_CM_CMD_GET_EVENT]    = ucma_get_event,
         [RDMA_USER_CM_CMD_GET_OPTION]   = NULL,
-        [RDMA_USER_CM_CMD_SET_OPTION]   = NULL,
+        [RDMA_USER_CM_CMD_SET_OPTION]   = ucma_set_option,
         [RDMA_USER_CM_CMD_NOTIFY]       = ucma_notify,
         [RDMA_USER_CM_CMD_JOIN_MCAST]   = ucma_join_multicast,
         [RDMA_USER_CM_CMD_LEAVE_MCAST]  = ucma_leave_multicast,
diff --git a/include/rdma/rdma_user_cm.h b/include/rdma/rdma_user_cm.h
index f632b0c007..9749c1b34d 100644
--- a/include/rdma/rdma_user_cm.h
+++ b/include/rdma/rdma_user_cm.h
@@ -212,4 +212,22 @@ struct rdma_ucm_event_resp {
         } param;
 };
 
+/* Option levels */
+enum {
+        RDMA_OPTION_ID          = 0
+};
+
+/* Option details */
+enum {
+        RDMA_OPTION_ID_TOS      = 0
+};
+
+struct rdma_ucm_set_option {
+        __u64 optval;
+        __u32 id;
+        __u32 level;
+        __u32 optname;
+        __u32 optlen;
+};
+
 #endif /* RDMA_USER_CM_H */