nvmf_tcp_read_buffer
error = nvmf_tcp_read_buffer(qp->s, &ch, sizeof(ch));
error = nvmf_tcp_read_buffer(qp->s, pdu->hdr + 1, plen - sizeof(ch));
error = nvmf_tcp_read_buffer(qp->s, pdu, sizeof(*pdu));
error = nvmf_tcp_read_buffer(qp->s, pdu, sizeof(*pdu));