ib_uverbs: XRC RCV qp implementation.

Thus, usage is:
Either: create/modify/query/destroy_xrc_rcv_qp
Or: create/modify/query/reg/unreg_xrc_rcv_qp

drivers/infiniband/core/uverbs_cmd.c +46 -0

+ssize_t ib_uverbs_modify_xrc_rcv_qp(struct ib_uverbs_file *file,
+				    const char __user *buf, int in_len,
+				    int out_len)
+{
+	struct ib_uverbs_modify_xrc_rcv_qp      cmd;
+	struct ib_qp_attr	       *attr;
+	struct ib_xrcd		       *xrcd;
+	struct ib_uobject	       *xrcd_uobj;
+	int				err;
+
+	if (copy_from_user(&cmd, buf, sizeof cmd))
+		return -EFAULT;
+
+	attr = kzalloc(sizeof *attr, GFP_KERNEL);
+	if (!attr)
+		return -ENOMEM;
+
+	xrcd = idr_read_xrcd(cmd.xrc_domain_handle, file->ucontext, &xrcd_uobj);
+	if (!xrcd) {
+		kfree(attr);
+		return -EINVAL;
+	}
+
+	attr->qp_state		  = cmd.qp_state;
+	attr->cur_qp_state	  = cmd.cur_qp_state;
+	attr->qp_access_flags	  = cmd.qp_access_flags;
+	attr->pkey_index	  = cmd.pkey_index;
+	attr->port_num		  = cmd.port_num;
+	attr->path_mtu		  = cmd.path_mtu;
+	attr->path_mig_state	  = cmd.path_mig_state;
+	attr->qkey		  = cmd.qkey;
+	attr->rq_psn		  = cmd.rq_psn;
+	attr->sq_psn		  = cmd.sq_psn;
+	attr->dest_qp_num	  = cmd.dest_qp_num;
+	attr->alt_pkey_index	  = cmd.alt_pkey_index;
+	attr->en_sqd_async_notify = cmd.en_sqd_async_notify;
+	attr->max_rd_atomic	  = cmd.max_rd_atomic;
+	attr->max_dest_rd_atomic  = cmd.max_dest_rd_atomic;
+	attr->min_rnr_timer	  = cmd.min_rnr_timer;
+	attr->port_num		  = cmd.port_num;
+	attr->timeout		  = cmd.timeout;
+	attr->retry_cnt		  = cmd.retry_cnt;
+	attr->rnr_retry		  = cmd.rnr_retry;
+	attr->alt_port_num	  = cmd.alt_port_num;
+	attr->alt_timeout	  = cmd.alt_timeout;
+

(quoted diff) +2 -0

+
+	err = xrcd->device->modify_xrc_rcv_qp(xrcd, cmd.qp_num, attr,

cmd.attr_mask);

drivers/infiniband/core/uverbs_cmd.c +76 -0

+	put_uobj_read(xrcd_uobj);
+	kfree(attr);
+	return err ? err : in_len;
+}
+
+ssize_t ib_uverbs_query_xrc_rcv_qp(struct ib_uverbs_file *file,
+				   const char __user *buf, int in_len,
+				   int out_len)
+{
+	struct ib_uverbs_query_xrc_rcv_qp cmd;
+	struct ib_uverbs_query_qp_resp	 resp;
+	struct ib_qp_attr		*attr;
+	struct ib_qp_init_attr		*init_attr;
+	struct ib_xrcd			*xrcd;
+	struct ib_uobject		*xrcd_uobj;
+	int				 ret;
+
+	if (copy_from_user(&cmd, buf, sizeof cmd))
+		return -EFAULT;
+
+	attr      = kmalloc(sizeof *attr, GFP_KERNEL);
+	init_attr = kmalloc(sizeof *init_attr, GFP_KERNEL);
+	if (!attr || !init_attr) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	xrcd = idr_read_xrcd(cmd.xrc_domain_handle, file->ucontext, &xrcd_uobj);
+	if (!xrcd) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = xrcd->device->query_xrc_rcv_qp(xrcd, cmd.qp_num, attr,
+					     cmd.attr_mask, init_attr);
+
+	put_uobj_read(xrcd_uobj);
+
+	if (ret)
+		goto out;
+
+	memset(&resp, 0, sizeof resp);
+	resp.qp_state		    = attr->qp_state;
+	resp.cur_qp_state	    = attr->cur_qp_state;
+	resp.path_mtu		    = attr->path_mtu;
+	resp.path_mig_state	    = attr->path_mig_state;
+	resp.qkey		    = attr->qkey;
+	resp.rq_psn		    = attr->rq_psn;
+	resp.sq_psn		    = attr->sq_psn;
+	resp.dest_qp_num	    = attr->dest_qp_num;
+	resp.qp_access_flags	    = attr->qp_access_flags;
+	resp.pkey_index		    = attr->pkey_index;
+	resp.alt_pkey_index	    = attr->alt_pkey_index;
+	resp.sq_draining	    = attr->sq_draining;
+	resp.max_rd_atomic	    = attr->max_rd_atomic;
+	resp.max_dest_rd_atomic	    = attr->max_dest_rd_atomic;
+	resp.min_rnr_timer	    = attr->min_rnr_timer;
+	resp.port_num		    = attr->port_num;
+	resp.timeout		    = attr->timeout;
+	resp.retry_cnt		    = attr->retry_cnt;
+	resp.rnr_retry		    = attr->rnr_retry;
+	resp.alt_port_num	    = attr->alt_port_num;
+	resp.alt_timeout	    = attr->alt_timeout;
+
+	memcpy(resp.dest.dgid, attr->ah_attr.grh.dgid.raw, 16);
+	resp.dest.flow_label	    = attr->ah_attr.grh.flow_label;
+	resp.dest.sgid_index	    = attr->ah_attr.grh.sgid_index;
+	resp.dest.hop_limit	    = attr->ah_attr.grh.hop_limit;
+	resp.dest.traffic_class	    = attr->ah_attr.grh.traffic_class;
+	resp.dest.dlid		    = attr->ah_attr.dlid;
+	resp.dest.sl		    = attr->ah_attr.sl;
+	resp.dest.src_path_bits	    = attr->ah_attr.src_path_bits;
+	resp.dest.static_rate	    = attr->ah_attr.static_rate;
+	resp.dest.is_global	    = !!(attr->ah_attr.ah_flags & IB_AH_GRH);
+	resp.dest.port_num	    = attr->ah_attr.port_num;
+

(quoted diff) +45 -0

+
+	if (copy_to_user((void __user *) (unsigned long) cmd.response,
+			 &resp, sizeof resp))
+		ret = -EFAULT;
+
+out:
+	kfree(attr);
+	kfree(init_attr);
+
+	return ret ? ret : in_len;
+}
+
 
+struct ib_uverbs_create_xrc_rcv_qp {
+	__u64 response;
+	__u64 user_handle;
+	__u32 xrcd_handle;
+	__u8  reserved1[28];
+	__u64 driver_data[0];
+};
+
+struct ib_uverbs_create_xrc_rcv_qp_resp {
+	__u32 qpn;
+	__u32 reserved;
+};
+
+struct ib_uverbs_modify_xrc_rcv_qp {
+	__u32 xrc_domain_handle;
+	__u32 qp_num;
+	struct ib_uverbs_qp_dest dest;
+	struct ib_uverbs_qp_dest alt_dest;
+	__u32 attr_mask;
+	__u32 qkey;
+	__u32 rq_psn;
+	__u32 sq_psn;
+	__u32 dest_qp_num;
+	__u32 qp_access_flags;
+	__u16 pkey_index;
+	__u16 alt_pkey_index;
+	__u8  qp_state;
+	__u8  cur_qp_state;
+	__u8  path_mtu;
+	__u8  path_mig_state;
+	__u8  en_sqd_async_notify;
+	__u8  max_rd_atomic;
+	__u8  max_dest_rd_atomic;

include/rdma/ib_user_verbs.h +17 -0

+
+struct ib_uverbs_query_xrc_rcv_qp {
+	__u64 response;
+	__u32 xrc_domain_handle;
+	__u32 qp_num;
+	__u32 attr_mask;
+	__u32 reserved;
+	__u64 driver_data[0];
+};
+
+struct ib_uverbs_destroy_xrc_rcv_qp {
+	__u32 xrc_domain_handle;
+	__u32 qp_num;
+	__u64 driver_data[0];
+};
+
+struct ib_uverbs_reg_xrc_rcv_qp {