svcrdma: Consolidate send_error helper functions

	rqstp->rq_arg.buflen = head->rc_arg.buflen;

}

static void svc_rdma_send_error(struct svcxprt_rdma *xprt,

static void svc_rdma_send_error(struct svcxprt_rdma *rdma,

				struct svc_rdma_recv_ctxt *rctxt,

				int status)

{

	__be32 *p, *rdma_argp = rctxt->rc_recv_buf;

	struct svc_rdma_send_ctxt *ctxt;

	int ret;

	ctxt = svc_rdma_send_ctxt_get(xprt);

	if (!ctxt)

		return;

	p = xdr_reserve_space(&ctxt->sc_stream,

			      rpcrdma_fixed_maxsz * sizeof(*p));

	if (!p)

		goto put_ctxt;

	*p++ = *rdma_argp;

	*p++ = *(rdma_argp + 1);

	*p++ = xprt->sc_fc_credits;

	*p = rdma_error;

	switch (status) {

	case -EPROTONOSUPPORT:

		p = xdr_reserve_space(&ctxt->sc_stream, 3 * sizeof(*p));

		if (!p)

			goto put_ctxt;

		*p++ = err_vers;

		*p++ = rpcrdma_version;

		*p = rpcrdma_version;

		trace_svcrdma_err_vers(*rdma_argp);

		break;

	default:

		p = xdr_reserve_space(&ctxt->sc_stream, sizeof(*p));

		if (!p)

			goto put_ctxt;

	struct svc_rdma_send_ctxt *sctxt;

		*p = err_chunk;

		trace_svcrdma_err_chunk(*rdma_argp);

	}

	ctxt->sc_send_wr.num_sge = 1;

	ctxt->sc_send_wr.opcode = IB_WR_SEND;

	ctxt->sc_sges[0].length = ctxt->sc_hdrbuf.len;

	ret = svc_rdma_send(xprt, &ctxt->sc_send_wr);

	if (ret)

		goto put_ctxt;

	sctxt = svc_rdma_send_ctxt_get(rdma);

	if (!sctxt)

		return;

put_ctxt:

	svc_rdma_send_ctxt_put(xprt, ctxt);

	svc_rdma_send_error_msg(rdma, sctxt, rctxt, status);

}

/* By convention, backchannel calls arrive via rdma_msg type